1 files changed, 2366 insertions, 0 deletions

diff --git a/arch/tile/include/hv/hypervisor.h b/arch/tile/include/hv/hypervisor.h
new file mode 100644
index 00000000000..84b31551080
--- /dev/null
+++ b/arch/tile/include/hv/hypervisor.h
@@ -0,0 +1,2366 @@
+/*
+ * Copyright 2010 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+/**
+ * @file hypervisor.h
+ * The hypervisor's public API.
+ */
+
+#ifndef _TILE_HV_H
+#define _TILE_HV_H
+
+#ifdef __tile__
+#include <arch/chip.h>
+#else
+/* HACK: Allow use by "tools/cpack/". */
+#include "install/include/arch/chip.h"
+#endif
+
+/* Linux builds want unsigned long constants, but assembler wants numbers */
+#ifdef __ASSEMBLER__
+/** One, for assembler */
+#define __HV_SIZE_ONE 1
+#elif !defined(__tile__) && CHIP_VA_WIDTH() > 32
+/** One, for 64-bit on host */
+#define __HV_SIZE_ONE 1ULL
+#else
+/** One, for Linux */
+#define __HV_SIZE_ONE 1UL
+#endif
+
+
+/** The log2 of the span of a level-1 page table, in bytes.
+ */
+#define HV_LOG2_L1_SPAN 32
+
+/** The span of a level-1 page table, in bytes.
+ */
+#define HV_L1_SPAN (__HV_SIZE_ONE << HV_LOG2_L1_SPAN)
+
+/** The log2 of the size of small pages, in bytes. This value should
+ * be verified at runtime by calling hv_sysconf(HV_SYSCONF_PAGE_SIZE_SMALL).
+ */
+#define HV_LOG2_PAGE_SIZE_SMALL 16
+
+/** The size of small pages, in bytes. This value should be verified
+ * at runtime by calling hv_sysconf(HV_SYSCONF_PAGE_SIZE_SMALL).
+ */
+#define HV_PAGE_SIZE_SMALL (__HV_SIZE_ONE << HV_LOG2_PAGE_SIZE_SMALL)
+
+/** The log2 of the size of large pages, in bytes. This value should be
+ * verified at runtime by calling hv_sysconf(HV_SYSCONF_PAGE_SIZE_LARGE).
+ */
+#define HV_LOG2_PAGE_SIZE_LARGE 24
+
+/** The size of large pages, in bytes. This value should be verified
+ * at runtime by calling hv_sysconf(HV_SYSCONF_PAGE_SIZE_LARGE).
+ */
+#define HV_PAGE_SIZE_LARGE (__HV_SIZE_ONE << HV_LOG2_PAGE_SIZE_LARGE)
+
+/** The log2 of the granularity at which page tables must be aligned;
+ *  in other words, the CPA for a page table must have this many zero
+ *  bits at the bottom of the address.
+ */
+#define HV_LOG2_PAGE_TABLE_ALIGN 11
+
+/** The granularity at which page tables must be aligned.
+ */
+#define HV_PAGE_TABLE_ALIGN (__HV_SIZE_ONE << HV_LOG2_PAGE_TABLE_ALIGN)
+
+/** Normal start of hypervisor glue in client physical memory. */
+#define HV_GLUE_START_CPA 0x10000
+
+/** This much space is reserved at HV_GLUE_START_CPA
+ * for the hypervisor glue. The client program must start at
+ * some address higher than this, and in particular the address of
+ * its text section should be equal to zero modulo HV_PAGE_SIZE_LARGE
+ * so that relative offsets to the HV glue are correct.
+ */
+#define HV_GLUE_RESERVED_SIZE 0x10000
+
+/** Each entry in the hv dispatch array takes this many bytes. */
+#define HV_DISPATCH_ENTRY_SIZE 32
+
+/** Version of the hypervisor interface defined by this file */
+#define _HV_VERSION 10
+
+/* Index into hypervisor interface dispatch code blocks.
+ *
+ * Hypervisor calls are invoked from user space by calling code
+ * at an address HV_BASE_ADDRESS + (index) * HV_DISPATCH_ENTRY_SIZE,
+ * where index is one of these enum values.
+ *
+ * Normally a supervisor is expected to produce a set of symbols
+ * starting at HV_BASE_ADDRESS that obey this convention, but a user
+ * program could call directly through function pointers if desired.
+ *
+ * These numbers are part of the binary API and will not be changed
+ * without updating HV_VERSION, which should be a rare event.
+ */
+
+/** reserved. */
+#define _HV_DISPATCH_RESERVED                     0
+
+/** hv_init  */
+#define HV_DISPATCH_INIT                          1
+
+/** hv_install_context */
+#define HV_DISPATCH_INSTALL_CONTEXT               2
+
+/** hv_sysconf */
+#define HV_DISPATCH_SYSCONF                       3
+
+/** hv_get_rtc */
+#define HV_DISPATCH_GET_RTC                       4
+
+/** hv_set_rtc */
+#define HV_DISPATCH_SET_RTC                       5
+
+/** hv_flush_asid */
+#define HV_DISPATCH_FLUSH_ASID                    6
+
+/** hv_flush_page */
+#define HV_DISPATCH_FLUSH_PAGE                    7
+
+/** hv_flush_pages */
+#define HV_DISPATCH_FLUSH_PAGES                   8
+
+/** hv_restart */
+#define HV_DISPATCH_RESTART                       9
+
+/** hv_halt */
+#define HV_DISPATCH_HALT                          10
+
+/** hv_power_off */
+#define HV_DISPATCH_POWER_OFF                     11
+
+/** hv_inquire_physical */
+#define HV_DISPATCH_INQUIRE_PHYSICAL              12
+
+/** hv_inquire_memory_controller */
+#define HV_DISPATCH_INQUIRE_MEMORY_CONTROLLER     13
+
+/** hv_inquire_virtual */
+#define HV_DISPATCH_INQUIRE_VIRTUAL               14
+
+/** hv_inquire_asid */
+#define HV_DISPATCH_INQUIRE_ASID                  15
+
+/** hv_nanosleep */
+#define HV_DISPATCH_NANOSLEEP                     16
+
+/** hv_console_read_if_ready */
+#define HV_DISPATCH_CONSOLE_READ_IF_READY         17
+
+/** hv_console_write */
+#define HV_DISPATCH_CONSOLE_WRITE                 18
+
+/** hv_downcall_dispatch */
+#define HV_DISPATCH_DOWNCALL_DISPATCH             19
+
+/** hv_inquire_topology */
+#define HV_DISPATCH_INQUIRE_TOPOLOGY              20
+
+/** hv_fs_findfile */
+#define HV_DISPATCH_FS_FINDFILE                   21
+
+/** hv_fs_fstat */
+#define HV_DISPATCH_FS_FSTAT                      22
+
+/** hv_fs_pread */
+#define HV_DISPATCH_FS_PREAD                      23
+
+/** hv_physaddr_read64 */
+#define HV_DISPATCH_PHYSADDR_READ64               24
+
+/** hv_physaddr_write64 */
+#define HV_DISPATCH_PHYSADDR_WRITE64              25
+
+/** hv_get_command_line */
+#define HV_DISPATCH_GET_COMMAND_LINE              26
+
+/** hv_set_caching */
+#define HV_DISPATCH_SET_CACHING                   27
+
+/** hv_bzero_page */
+#define HV_DISPATCH_BZERO_PAGE                    28
+
+/** hv_register_message_state */
+#define HV_DISPATCH_REGISTER_MESSAGE_STATE        29
+
+/** hv_send_message */
+#define HV_DISPATCH_SEND_MESSAGE                  30
+
+/** hv_receive_message */
+#define HV_DISPATCH_RECEIVE_MESSAGE               31
+
+/** hv_inquire_context */
+#define HV_DISPATCH_INQUIRE_CONTEXT               32
+
+/** hv_start_all_tiles */
+#define HV_DISPATCH_START_ALL_TILES               33
+
+/** hv_dev_open */
+#define HV_DISPATCH_DEV_OPEN                      34
+
+/** hv_dev_close */
+#define HV_DISPATCH_DEV_CLOSE                     35
+
+/** hv_dev_pread */
+#define HV_DISPATCH_DEV_PREAD                     36
+
+/** hv_dev_pwrite */
+#define HV_DISPATCH_DEV_PWRITE                    37
+
+/** hv_dev_poll */
+#define HV_DISPATCH_DEV_POLL                      38
+
+/** hv_dev_poll_cancel */
+#define HV_DISPATCH_DEV_POLL_CANCEL               39
+
+/** hv_dev_preada */
+#define HV_DISPATCH_DEV_PREADA                    40
+
+/** hv_dev_pwritea */
+#define HV_DISPATCH_DEV_PWRITEA                   41
+
+/** hv_flush_remote */
+#define HV_DISPATCH_FLUSH_REMOTE                  42
+
+/** hv_console_putc */
+#define HV_DISPATCH_CONSOLE_PUTC                  43
+
+/** hv_inquire_tiles */
+#define HV_DISPATCH_INQUIRE_TILES                 44
+
+/** hv_confstr */
+#define HV_DISPATCH_CONFSTR                       45
+
+/** hv_reexec */
+#define HV_DISPATCH_REEXEC                        46
+
+/** hv_set_command_line */
+#define HV_DISPATCH_SET_COMMAND_LINE              47
+
+/** hv_dev_register_intr_state */
+#define HV_DISPATCH_DEV_REGISTER_INTR_STATE       48
+
+/** hv_enable_intr */
+#define HV_DISPATCH_ENABLE_INTR                   49
+
+/** hv_disable_intr */
+#define HV_DISPATCH_DISABLE_INTR                  50
+
+/** hv_trigger_ipi */
+#define HV_DISPATCH_TRIGGER_IPI                   51
+
+/** hv_store_mapping */
+#define HV_DISPATCH_STORE_MAPPING                 52
+
+/** hv_inquire_realpa */
+#define HV_DISPATCH_INQUIRE_REALPA                53
+
+/** hv_flush_all */
+#define HV_DISPATCH_FLUSH_ALL                     54
+
+/** One more than the largest dispatch value */
+#define _HV_DISPATCH_END                          55
+
+
+#ifndef __ASSEMBLER__
+
+#ifdef __KERNEL__
+#include <asm/types.h>
+typedef u32 __hv32;        /**< 32-bit value */
+typedef u64 __hv64;        /**< 64-bit value */
+#else
+#include <stdint.h>
+typedef uint32_t __hv32;   /**< 32-bit value */
+typedef uint64_t __hv64;   /**< 64-bit value */
+#endif
+
+
+/** Hypervisor physical address. */
+typedef __hv64 HV_PhysAddr;
+
+#if CHIP_VA_WIDTH() > 32
+/** Hypervisor virtual address. */
+typedef __hv64 HV_VirtAddr;
+#else
+/** Hypervisor virtual address. */
+typedef __hv32 HV_VirtAddr;
+#endif /* CHIP_VA_WIDTH() > 32 */
+
+/** Hypervisor ASID. */
+typedef unsigned int HV_ASID;
+
+/** Hypervisor tile location for a memory access
+ * ("location overridden target").
+ */
+typedef unsigned int HV_LOTAR;
+
+/** Hypervisor size of a page. */
+typedef unsigned long HV_PageSize;
+
+/** A page table entry.
+ */
+typedef struct
+{
+  __hv64 val;                /**< Value of PTE */
+} HV_PTE;
+
+/** Hypervisor error code. */
+typedef int HV_Errno;
+
+#endif /* !__ASSEMBLER__ */
+
+#define HV_OK           0    /**< No error */
+#define HV_EINVAL      -801  /**< Invalid argument */
+#define HV_ENODEV      -802  /**< No such device */
+#define HV_ENOENT      -803  /**< No such file or directory */
+#define HV_EBADF       -804  /**< Bad file number */
+#define HV_EFAULT      -805  /**< Bad address */
+#define HV_ERECIP      -806  /**< Bad recipients */
+#define HV_E2BIG       -807  /**< Message too big */
+#define HV_ENOTSUP     -808  /**< Service not supported */
+#define HV_EBUSY       -809  /**< Device busy */
+#define HV_ENOSYS      -810  /**< Invalid syscall */
+#define HV_EPERM       -811  /**< No permission */
+#define HV_ENOTREADY   -812  /**< Device not ready */
+#define HV_EIO         -813  /**< I/O error */
+#define HV_ENOMEM      -814  /**< Out of memory */
+
+#define HV_ERR_MAX     -801  /**< Largest HV error code */
+#define HV_ERR_MIN     -814  /**< Smallest HV error code */
+
+#ifndef __ASSEMBLER__
+
+/** Pass HV_VERSION to hv_init to request this version of the interface. */
+typedef enum { HV_VERSION = _HV_VERSION } HV_VersionNumber;
+
+/** Initializes the hypervisor.
+ *
+ * @param interface_version_number The version of the hypervisor interface
+ * that this program expects, typically HV_VERSION.
+ * @param chip_num Architecture number of the chip the client was built for.
+ * @param chip_rev_num Revision number of the chip the client was built for.
+ */
+void hv_init(HV_VersionNumber interface_version_number,
+             int chip_num, int chip_rev_num);
+
+
+/** Queries we can make for hv_sysconf().
+ *
+ * These numbers are part of the binary API and guaranteed not to change.
+ */
+typedef enum {
+  /** An invalid value; do not use. */
+  _HV_SYSCONF_RESERVED       = 0,
+
+  /** The length of the glue section containing the hv_ procs, in bytes. */
+  HV_SYSCONF_GLUE_SIZE       = 1,
+
+  /** The size of small pages, in bytes. */
+  HV_SYSCONF_PAGE_SIZE_SMALL = 2,
+
+  /** The size of large pages, in bytes. */
+  HV_SYSCONF_PAGE_SIZE_LARGE = 3,
+
+  /** Processor clock speed, in hertz. */
+  HV_SYSCONF_CPU_SPEED       = 4,
+
+  /** Processor temperature, in degrees Kelvin.  The value
+   *  HV_SYSCONF_TEMP_KTOC may be subtracted from this to get degrees
+   *  Celsius.  If that Celsius value is HV_SYSCONF_OVERTEMP, this indicates
+   *  that the temperature has hit an upper limit and is no longer being
+   *  accurately tracked.
+   */
+  HV_SYSCONF_CPU_TEMP        = 5,
+
+  /** Board temperature, in degrees Kelvin.  The value
+   *  HV_SYSCONF_TEMP_KTOC may be subtracted from this to get degrees
+   *  Celsius.  If that Celsius value is HV_SYSCONF_OVERTEMP, this indicates
+   *  that the temperature has hit an upper limit and is no longer being
+   *  accurately tracked.
+   */
+  HV_SYSCONF_BOARD_TEMP      = 6
+
+} HV_SysconfQuery;
+
+/** Offset to subtract from returned Kelvin temperature to get degrees
+    Celsius. */
+#define HV_SYSCONF_TEMP_KTOC 273
+
+/** Pseudo-temperature value indicating that the temperature has
+ *  pegged at its upper limit and is no longer accurate; note that this is
+ *  the value after subtracting HV_SYSCONF_TEMP_KTOC. */
+#define HV_SYSCONF_OVERTEMP 999
+
+/** Query a configuration value from the hypervisor.
+ * @param query Which value is requested (HV_SYSCONF_xxx).
+ * @return The requested value, or -1 the requested value is illegal or
+ *         unavailable.
+ */
+long hv_sysconf(HV_SysconfQuery query);
+
+
+/** Queries we can make for hv_confstr().
+ *
+ * These numbers are part of the binary API and guaranteed not to change.
+ */
+typedef enum {
+  /** An invalid value; do not use. */
+  _HV_CONFSTR_RESERVED        = 0,
+
+  /** Board part number. */
+  HV_CONFSTR_BOARD_PART_NUM   = 1,
+
+  /** Board serial number. */
+  HV_CONFSTR_BOARD_SERIAL_NUM = 2,
+
+  /** Chip serial number. */
+  HV_CONFSTR_CHIP_SERIAL_NUM  = 3,
+
+  /** Board revision level. */
+  HV_CONFSTR_BOARD_REV        = 4,
+
+  /** Hypervisor software version. */
+  HV_CONFSTR_HV_SW_VER        = 5,
+
+  /** The name for this chip model. */
+  HV_CONFSTR_CHIP_MODEL       = 6,
+
+  /** Human-readable board description. */
+  HV_CONFSTR_BOARD_DESC       = 7,
+
+  /** Human-readable description of the hypervisor configuration. */
+  HV_CONFSTR_HV_CONFIG        = 8,
+
+  /** Human-readable version string for the boot image (for instance,
+   *  who built it and when, what configuration file was used). */
+  HV_CONFSTR_HV_CONFIG_VER    = 9,
+
+  /** Mezzanine part number. */
+  HV_CONFSTR_MEZZ_PART_NUM   = 10,
+
+  /** Mezzanine serial number. */
+  HV_CONFSTR_MEZZ_SERIAL_NUM = 11,
+
+  /** Mezzanine revision level. */
+  HV_CONFSTR_MEZZ_REV        = 12,
+
+  /** Human-readable mezzanine description. */
+  HV_CONFSTR_MEZZ_DESC       = 13,
+
+  /** Control path for the onboard network switch. */
+  HV_CONFSTR_SWITCH_CONTROL  = 14,
+
+  /** Chip revision level. */
+  HV_CONFSTR_CHIP_REV        = 15
+
+} HV_ConfstrQuery;
+
+/** Query a configuration string from the hypervisor.
+ *
+ * @param query Identifier for the specific string to be retrieved
+ *        (HV_CONFSTR_xxx).
+ * @param buf Buffer in which to place the string.
+ * @param len Length of the buffer.
+ * @return If query is valid, then the length of the corresponding string,
+ *        including the trailing null; if this is greater than len, the string
+ *        was truncated.  If query is invalid, HV_EINVAL.  If the specified
+ *        buffer is not writable by the client, HV_EFAULT.
+ */
+int hv_confstr(HV_ConfstrQuery query, HV_VirtAddr buf, int len);
+
+/** State object used to enable and disable one-shot and level-sensitive
+ *  interrupts. */
+typedef struct
+{
+#if CHIP_VA_WIDTH() > 32
+  __hv64 opaque[2]; /**< No user-serviceable parts inside */
+#else
+  __hv32 opaque[2]; /**< No user-serviceable parts inside */
+#endif
+}
+HV_IntrState;
+
+/** A set of interrupts. */
+typedef __hv32 HV_IntrMask;
+
+/** Tile coordinate */
+typedef struct
+{
+  /** X coordinate, relative to supervisor's top-left coordinate */
+  int x;
+
+  /** Y coordinate, relative to supervisor's top-left coordinate */
+  int y;
+} HV_Coord;
+
+/** The low interrupt numbers are reserved for use by the client in
+ *  delivering IPIs.  Any interrupt numbers higher than this value are
+ *  reserved for use by HV device drivers. */
+#define HV_MAX_IPI_INTERRUPT 7
+
+/** Register an interrupt state object.  This object is used to enable and
+ *  disable one-shot and level-sensitive interrupts.  Once the state is
+ *  registered, the client must not read or write the state object; doing
+ *  so will cause undefined results.
+ *
+ * @param intr_state Pointer to interrupt state object.
+ * @return HV_OK on success, or a hypervisor error code.
+ */
+HV_Errno hv_dev_register_intr_state(HV_IntrState* intr_state);
+
+/** Enable a set of one-shot and level-sensitive interrupts.
+ *
+ * @param intr_state Pointer to interrupt state object.
+ * @param enab_mask Bitmap of interrupts to enable.
+ */
+void hv_enable_intr(HV_IntrState* intr_state, HV_IntrMask enab_mask);
+
+/** Disable a set of one-shot and level-sensitive interrupts.
+ *
+ * @param intr_state Pointer to interrupt state object.
+ * @param disab_mask Bitmap of interrupts to disable.
+ */
+void hv_disable_intr(HV_IntrState* intr_state, HV_IntrMask disab_mask);
+
+/** Trigger a one-shot interrupt on some tile
+ *
+ * @param tile Which tile to interrupt.
+ * @param interrupt Interrupt number to trigger; must be between 0 and
+ *        HV_MAX_IPI_INTERRUPT.
+ * @return HV_OK on success, or a hypervisor error code.
+ */
+HV_Errno hv_trigger_ipi(HV_Coord tile, int interrupt);
+
+/** Store memory mapping in debug memory so that external debugger can read it.
+ * A maximum of 16 entries can be stored.
+ *
+ * @param va VA of memory that is mapped.
+ * @param len Length of mapped memory.
+ * @param pa PA of memory that is mapped.
+ * @return 0 on success, -1 if the maximum number of mappings is exceeded.
+ */
+int hv_store_mapping(HV_VirtAddr va, unsigned int len, HV_PhysAddr pa);
+
+/** Given a client PA and a length, return its real (HV) PA.
+ *
+ * @param cpa Client physical address.
+ * @param len Length of mapped memory.
+ * @return physical address, or -1 if cpa or len is not valid.
+ */
+HV_PhysAddr hv_inquire_realpa(HV_PhysAddr cpa, unsigned int len);
+
+/** RTC return flag for no RTC chip present.
+ */
+#define HV_RTC_NO_CHIP     0x1
+
+/** RTC return flag for low-voltage condition, indicating that battery had
+ * died and time read is unreliable.
+ */
+#define HV_RTC_LOW_VOLTAGE 0x2
+
+/** Date/Time of day */
+typedef struct {
+#if CHIP_WORD_SIZE() > 32
+  __hv64 tm_sec;   /**< Seconds, 0-59 */
+  __hv64 tm_min;   /**< Minutes, 0-59 */
+  __hv64 tm_hour;  /**< Hours, 0-23 */
+  __hv64 tm_mday;  /**< Day of month, 0-30 */
+  __hv64 tm_mon;   /**< Month, 0-11 */
+  __hv64 tm_year;  /**< Years since 1900, 0-199 */
+  __hv64 flags;    /**< Return flags, 0 if no error */
+#else
+  __hv32 tm_sec;   /**< Seconds, 0-59 */
+  __hv32 tm_min;   /**< Minutes, 0-59 */
+  __hv32 tm_hour;  /**< Hours, 0-23 */
+  __hv32 tm_mday;  /**< Day of month, 0-30 */
+  __hv32 tm_mon;   /**< Month, 0-11 */
+  __hv32 tm_year;  /**< Years since 1900, 0-199 */
+  __hv32 flags;    /**< Return flags, 0 if no error */
+#endif
+} HV_RTCTime;
+
+/** Read the current time-of-day clock.
+ * @return HV_RTCTime of current time (GMT).
+ */
+HV_RTCTime hv_get_rtc(void);
+
+
+/** Set the current time-of-day clock.
+ * @param time time to reset time-of-day to (GMT).
+ */
+void hv_set_rtc(HV_RTCTime time);
+
+/** Installs a context, comprising a page table and other attributes.
+ *
+ *  Once this service completes, page_table will be used to translate
+ *  subsequent virtual address references to physical memory.
+ *
+ *  Installing a context does not cause an implicit TLB flush.  Before
+ *  reusing an ASID value for a different address space, the client is
+ *  expected to flush old references from the TLB with hv_flush_asid().
+ *  (Alternately, hv_flush_all() may be used to flush many ASIDs at once.)
+ *  After invalidating a page table entry, changing its attributes, or
+ *  changing its target CPA, the client is expected to flush old references
+ *  from the TLB with hv_flush_page() or hv_flush_pages(). Making a
+ *  previously invalid page valid does not require a flush.
+ *
+ *  Specifying an invalid ASID, or an invalid CPA (client physical address)
+ *  (either as page_table_pointer, or within the referenced table),
+ *  or another page table data item documented as above as illegal may
+ *  lead to client termination; since the validation of the table is
+ *  done as needed, this may happen before the service returns, or at
+ *  some later time, or never, depending upon the client's pattern of
+ *  memory references.  Page table entries which supply translations for
+ *  invalid virtual addresses may result in client termination, or may
+ *  be silently ignored.  "Invalid" in this context means a value which
+ *  was not provided to the client via the appropriate hv_inquire_* routine.
+ *
+ *  To support changing the instruction VAs at the same time as
+ *  installing the new page table, this call explicitly supports
+ *  setting the "lr" register to a different address and then jumping
+ *  directly to the hv_install_context() routine.  In this case, the
+ *  new page table does not need to contain any mapping for the
+ *  hv_install_context address itself.
+ *
+ * @param page_table Root of the page table.
+ * @param access PTE providing info on how to read the page table.  This
+ *   value must be consistent between multiple tiles sharing a page table,
+ *   and must also be consistent with any virtual mappings the client
+ *   may be using to access the page table.
+ * @param asid HV_ASID the page table is to be used for.
+ * @param flags Context flags, denoting attributes or privileges of the
+ *   current context (HV_CTX_xxx).
+ * @return Zero on success, or a hypervisor error code on failure.
+ */
+int hv_install_context(HV_PhysAddr page_table, HV_PTE access, HV_ASID asid,
+                       __hv32 flags);
+
+#endif /* !__ASSEMBLER__ */
+
+#define HV_CTX_DIRECTIO     0x1   /**< Direct I/O requests are accepted from
+                                       PL0. */
+
+#ifndef __ASSEMBLER__
+
+/** Value returned from hv_inquire_context(). */
+typedef struct
+{
+  /** Physical address of page table */
+  HV_PhysAddr page_table;
+
+  /** PTE which defines access method for top of page table */
+  HV_PTE access;
+
+  /** ASID associated with this page table */
+  HV_ASID asid;
+
+  /** Context flags */
+  __hv32 flags;
+} HV_Context;
+
+/** Retrieve information about the currently installed context.
+ * @return The data passed to the last successful hv_install_context call.
+ */
+HV_Context hv_inquire_context(void);
+
+
+/** Flushes all translations associated with the named address space
+ *  identifier from the TLB and any other hypervisor data structures.
+ *  Translations installed with the "global" bit are not flushed.
+ *
+ *  Specifying an invalid ASID may lead to client termination.  "Invalid"
+ *  in this context means a value which was not provided to the client
+ *  via <tt>hv_inquire_asid()</tt>.
+ *
+ * @param asid HV_ASID whose entries are to be flushed.
+ * @return Zero on success, or a hypervisor error code on failure.
+*/
+int hv_flush_asid(HV_ASID asid);
+
+
+/** Flushes all translations associated with the named virtual address
+ *  and page size from the TLB and other hypervisor data structures. Only
+ *  pages visible to the current ASID are affected; note that this includes
+ *  global pages in addition to pages specific to the current ASID.
+ *
+ *  The supplied VA need not be aligned; it may be anywhere in the
+ *  subject page.
+ *
+ *  Specifying an invalid virtual address may lead to client termination,
+ *  or may silently succeed.  "Invalid" in this context means a value
+ *  which was not provided to the client via hv_inquire_virtual.
+ *
+ * @param address Address of the page to flush.
+ * @param page_size Size of pages to assume.
+ * @return Zero on success, or a hypervisor error code on failure.
+ */
+int hv_flush_page(HV_VirtAddr address, HV_PageSize page_size);
+
+
+/** Flushes all translations associated with the named virtual address range
+ *  and page size from the TLB and other hypervisor data structures. Only
+ *  pages visible to the current ASID are affected; note that this includes
+ *  global pages in addition to pages specific to the current ASID.
+ *
+ *  The supplied VA need not be aligned; it may be anywhere in the
+ *  subject page.
+ *
+ *  Specifying an invalid virtual address may lead to client termination,
+ *  or may silently succeed.  "Invalid" in this context means a value
+ *  which was not provided to the client via hv_inquire_virtual.
+ *
+ * @param start Address to flush.
+ * @param page_size Size of pages to assume.
+ * @param size The number of bytes to flush. Any page in the range
+ *        [start, start + size) will be flushed from the TLB.
+ * @return Zero on success, or a hypervisor error code on failure.
+ */
+int hv_flush_pages(HV_VirtAddr start, HV_PageSize page_size,
+                   unsigned long size);
+
+
+/** Flushes all non-global translations (if preserve_global is true),
+ *  or absolutely all translations (if preserve_global is false).
+ *
+ * @param preserve_global Non-zero if we want to preserve "global" mappings.
+ * @return Zero on success, or a hypervisor error code on failure.
+*/
+int hv_flush_all(int preserve_global);
+
+
+/** Restart machine with optional restart command and optional args.
+ * @param cmd Const pointer to command to restart with, or NULL
+ * @param args Const pointer to argument string to restart with, or NULL
+ */
+void hv_restart(HV_VirtAddr cmd, HV_VirtAddr args);
+
+
+/** Halt machine. */
+void hv_halt(void);
+
+
+/** Power off machine. */
+void hv_power_off(void);
+
+
+/** Re-enter virtual-is-physical memory translation mode and restart
+ *  execution at a given address.
+ * @param entry Client physical address at which to begin execution.
+ * @return A hypervisor error code on failure; if the operation is
+ *         successful the call does not return.
+ */
+int hv_reexec(HV_PhysAddr entry);
+
+
+/** Chip topology */
+typedef struct
+{
+  /** Relative coordinates of the querying tile */
+  HV_Coord coord;
+
+  /** Width of the querying supervisor's tile rectangle. */
+  int width;
+
+  /** Height of the querying supervisor's tile rectangle. */
+  int height;
+
+} HV_Topology;
+
+/** Returns information about the tile coordinate system.
+ *
+ * Each supervisor is given a rectangle of tiles it potentially controls.
+ * These tiles are labeled using a relative coordinate system with (0,0) as
+ * the upper left tile regardless of their physical location on the chip.
+ *
+ * This call returns both the size of that rectangle and the position
+ * within that rectangle of the querying tile.
+ *
+ * Not all tiles within that rectangle may be available to the supervisor;
+ * to get the precise set of available tiles, you must also call
+ * hv_inquire_tiles(HV_INQ_TILES_AVAIL, ...).
+ **/
+HV_Topology hv_inquire_topology(void);
+
+/** Sets of tiles we can retrieve with hv_inquire_tiles().
+ *
+ * These numbers are part of the binary API and guaranteed not to change.
+ */
+typedef enum {
+  /** An invalid value; do not use. */
+  _HV_INQ_TILES_RESERVED       = 0,
+
+  /** All available tiles within the supervisor's tile rectangle. */
+  HV_INQ_TILES_AVAIL           = 1,
+
+  /** The set of tiles used for hash-for-home caching. */
+  HV_INQ_TILES_HFH_CACHE       = 2,
+
+  /** The set of tiles that can be legally used as a LOTAR for a PTE. */
+  HV_INQ_TILES_LOTAR           = 3
+} HV_InqTileSet;
+
+/** Returns specific information about various sets of tiles within the
+ *  supervisor's tile rectangle.
+ *
+ * @param set Which set of tiles to retrieve.
+ * @param cpumask Pointer to a returned bitmask (in row-major order,
+ *        supervisor-relative) of tiles.  The low bit of the first word
+ *        corresponds to the tile at the upper left-hand corner of the
+ *        supervisor's rectangle.  In order for the supervisor to know the
+ *        buffer length to supply, it should first call hv_inquire_topology.
+ * @param length Number of bytes available for the returned bitmask.
+ **/
+HV_Errno hv_inquire_tiles(HV_InqTileSet set, HV_VirtAddr cpumask, int length);
+
+
+/** An identifier for a memory controller. Multiple memory controllers
+ * may be connected to one chip, and this uniquely identifies each one.
+ */
+typedef int HV_MemoryController;
+
+/** A range of physical memory. */
+typedef struct
+{
+  HV_PhysAddr start;   /**< Starting address. */
+  __hv64 size;         /**< Size in bytes. */
+  HV_MemoryController controller;  /**< Which memory controller owns this. */
+} HV_PhysAddrRange;
+
+/** Returns information about a range of physical memory.
+ *
+ * hv_inquire_physical() returns one of the ranges of client
+ * physical addresses which are available to this client.
+ *
+ * The first range is retrieved by specifying an idx of 0, and
+ * successive ranges are returned with subsequent idx values.  Ranges
+ * are ordered by increasing start address (i.e., as idx increases,
+ * so does start), do not overlap, and do not touch (i.e., the
+ * available memory is described with the fewest possible ranges).
+ *
+ * If an out-of-range idx value is specified, the returned size will be zero.
+ * A client can count the number of ranges by increasing idx until the
+ * returned size is zero. There will always be at least one valid range.
+ *
+ * Some clients might not be prepared to deal with more than one
+ * physical address range; they still ought to call this routine and
+ * issue a warning message if they're given more than one range, on the
+ * theory that whoever configured the hypervisor to provide that memory
+ * should know that it's being wasted.
+ */
+HV_PhysAddrRange hv_inquire_physical(int idx);
+
+
+/** Memory controller information. */
+typedef struct
+{
+  HV_Coord coord;   /**< Relative tile coordinates of the port used by a
+                         specified tile to communicate with this controller. */
+  __hv64 speed;     /**< Speed of this controller in bytes per second. */
+} HV_MemoryControllerInfo;
+
+/** Returns information about a particular memory controller.
+ *
+ *  hv_inquire_memory_controller(coord,idx) returns information about a
+ *  particular controller.  Two pieces of information are returned:
+ *  - The relative coordinates of the port on the controller that the specified
+ *    tile would use to contact it.  The relative coordinates may lie
+ *    outside the supervisor's rectangle, i.e. the controller may not
+ *    be attached to a node managed by the querying node's supervisor.
+ *    In particular note that x or y may be negative.
+ *  - The speed of the memory controller.  (This is a not-to-exceed value
+ *    based on the raw hardware data rate, and may not be achievable in
+ *    practice; it is provided to give clients information on the relative
+ *    performance of the available controllers.)
+ *
+ *  Clients should avoid calling this interface with invalid values.
+ *  A client who does may be terminated.
+ * @param coord Tile for which to calculate the relative port position.
+ * @param controller Index of the controller; identical to value returned
+ *        from other routines like hv_inquire_physical.
+ * @return Information about the controller.
+ */
+HV_MemoryControllerInfo hv_inquire_memory_controller(HV_Coord coord,
+                                                     int controller);
+
+
+/** A range of virtual memory. */
+typedef struct
+{
+  HV_VirtAddr start;   /**< Starting address. */
+  __hv64 size;         /**< Size in bytes. */
+} HV_VirtAddrRange;
+
+/** Returns information about a range of virtual memory.
+ *
+ * hv_inquire_virtual() returns one of the ranges of client
+ * virtual addresses which are available to this client.
+ *
+ * The first range is retrieved by specifying an idx of 0, and
+ * successive ranges are returned with subsequent idx values.  Ranges
+ * are ordered by increasing start address (i.e., as idx increases,
+ * so does start), do not overlap, and do not touch (i.e., the
+ * available memory is described with the fewest possible ranges).
+ *
+ * If an out-of-range idx value is specified, the returned size will be zero.
+ * A client can count the number of ranges by increasing idx until the
+ * returned size is zero. There will always be at least one valid range.
+ *
+ * Some clients may well have various virtual addresses hardwired
+ * into themselves; for instance, their instruction stream may
+ * have been compiled expecting to live at a particular address.
+ * Such clients should use this interface to verify they've been
+ * given the virtual address space they expect, and issue a (potentially
+ * fatal) warning message otherwise.
+ *
+ * Note that the returned size is a __hv64, not a __hv32, so it is
+ * possible to express a single range spanning the entire 32-bit
+ * address space.
+ */
+HV_VirtAddrRange hv_inquire_virtual(int idx);
+
+
+/** A range of ASID values. */
+typedef struct
+{
+  HV_ASID start;        /**< First ASID in the range. */
+  unsigned int size;    /**< Number of ASIDs. Zero for an invalid range. */
+} HV_ASIDRange;
+
+/** Returns information about a range of ASIDs.
+ *
+ * hv_inquire_asid() returns one of the ranges of address
+ * space identifiers which are available to this client.
+ *
+ * The first range is retrieved by specifying an idx of 0, and
+ * successive ranges are returned with subsequent idx values.  Ranges
+ * are ordered by increasing start value (i.e., as idx increases,
+ * so does start), do not overlap, and do not touch (i.e., the
+ * available ASIDs are described with the fewest possible ranges).
+ *
+ * If an out-of-range idx value is specified, the returned size will be zero.
+ * A client can count the number of ranges by increasing idx until the
+ * returned size is zero. There will always be at least one valid range.
+ */
+HV_ASIDRange hv_inquire_asid(int idx);
+
+
+/** Waits for at least the specified number of nanoseconds then returns.
+ *
+ * @param nanosecs The number of nanoseconds to sleep.
+ */
+void hv_nanosleep(int nanosecs);
+
+
+/** Reads a character from the console without blocking.
+ *
+ * @return A value from 0-255 indicates the value successfully read.
+ * A negative value means no value was ready.
+ */
+int hv_console_read_if_ready(void);
+
+
+/** Writes a character to the console, blocking if the console is busy.
+ *
+ *  This call cannot fail. If the console is broken for some reason,
+ *  output will simply vanish.
+ * @param byte Character to write.
+ */
+void hv_console_putc(int byte);
+
+
+/** Writes a string to the console, blocking if the console is busy.
+ * @param bytes Pointer to characters to write.
+ * @param len Number of characters to write.
+ * @return Number of characters written, or HV_EFAULT if the buffer is invalid.
+ */
+int hv_console_write(HV_VirtAddr bytes, int len);
+
+
+/** Dispatch the next interrupt from the client downcall mechanism.
+ *
+ *  The hypervisor uses downcalls to notify the client of asynchronous
+ *  events.  Some of these events are hypervisor-created (like incoming
+ *  messages).  Some are regular interrupts which initially occur in
+ *  the hypervisor, and are normally handled directly by the client;
+ *  when these occur in a client's interrupt critical section, they must
+ *  be delivered through the downcall mechanism.
+ *
+ *  A downcall is initially delivered to the client as an INTCTRL_1
+ *  interrupt.  Upon entry to the INTCTRL_1 vector, the client must
+ *  immediately invoke the hv_downcall_dispatch service.  This service
+ *  will not return; instead it will cause one of the client's actual
+ *  downcall-handling interrupt vectors to be entered.  The EX_CONTEXT
+ *  registers in the client will be set so that when the client irets,
+ *  it will return to the code which was interrupted by the INTCTRL_1
+ *  interrupt.
+ *
+ *  Any saving of registers should be done by the actual handling
+ *  vectors; no registers should be changed by the INTCTRL_1 handler.
+ *  In particular, the client should not use a jal instruction to invoke
+ *  the hv_downcall_dispatch service, as that would overwrite the client's
+ *  lr register.  Note that the hv_downcall_dispatch service may overwrite
+ *  one or more of the client's system save registers.
+ *
+ *  The client must not modify the INTCTRL_1_STATUS SPR.  The hypervisor
+ *  will set this register to cause a downcall to happen, and will clear
+ *  it when no further downcalls are pending.
+ *
+ *  When a downcall vector is entered, the INTCTRL_1 interrupt will be
+ *  masked.  When the client is done processing a downcall, and is ready
+ *  to accept another, it must unmask this interrupt; if more downcalls
+ *  are pending, this will cause the INTCTRL_1 vector to be reentered.
+ *  Currently the following interrupt vectors can be entered through a
+ *  downcall:
+ *
+ *  INT_MESSAGE_RCV_DWNCL   (hypervisor message available)
+ *  INT_DMATLB_MISS_DWNCL   (DMA TLB miss)
+ *  INT_SNITLB_MISS_DWNCL   (SNI TLB miss)
+ *  INT_DMATLB_ACCESS_DWNCL (DMA TLB access violation)
+ */
+void hv_downcall_dispatch(void);
+
+#endif /* !__ASSEMBLER__ */
+
+/** We use actual interrupt vectors which never occur (they're only there
+ *  to allow setting MPLs for related SPRs) for our downcall vectors.
+ */
+/** Message receive downcall interrupt vector */
+#define INT_MESSAGE_RCV_DWNCL    INT_BOOT_ACCESS
+/** DMA TLB miss downcall interrupt vector */
+#define INT_DMATLB_MISS_DWNCL    INT_DMA_ASID
+/** Static nework processor instruction TLB miss interrupt vector */
+#define INT_SNITLB_MISS_DWNCL    INT_SNI_ASID
+/** DMA TLB access violation downcall interrupt vector */
+#define INT_DMATLB_ACCESS_DWNCL  INT_DMA_CPL
+/** Device interrupt downcall interrupt vector */
+#define INT_DEV_INTR_DWNCL       INT_WORLD_ACCESS
+
+#ifndef __ASSEMBLER__
+
+/** Requests the inode for a specific full pathname.
+ *
+ * Performs a lookup in the hypervisor filesystem for a given filename.
+ * Multiple calls with the same filename will always return the same inode.
+ * If there is no such filename, HV_ENOENT is returned.
+ * A bad filename pointer may result in HV_EFAULT instead.
+ *
+ * @param filename Constant pointer to name of requested file
+ * @return Inode of requested file
+ */
+int hv_fs_findfile(HV_VirtAddr filename);
+
+
+/** Data returned from an fstat request.
+ * Note that this structure should be no more than 40 bytes in size so
+ * that it can always be returned completely in registers.
+ */
+typedef struct
+{
+  int size;             /**< Size of file (or HV_Errno on error) */
+  unsigned int flags;   /**< Flags (see HV_FS_FSTAT_FLAGS) */
+} HV_FS_StatInfo;
+
+/** Bitmask flags for fstat request */
+typedef enum
+{
+  HV_FS_ISDIR    = 0x0001   /**< Is the entry a directory? */
+} HV_FS_FSTAT_FLAGS;
+
+/** Get stat information on a given file inode.
+ *
+ * Return information on the file with the given inode.
+ *
+ * IF the HV_FS_ISDIR bit is set, the "file" is a directory.  Reading
+ * it will return NUL-separated filenames (no directory part) relative
+ * to the path to the inode of the directory "file".  These can be
+ * appended to the path to the directory "file" after a forward slash
+ * to create additional filenames.  Note that it is not required
+ * that all valid paths be decomposable into valid parent directories;
+ * a filesystem may validly have just a few files, none of which have
+ * HV_FS_ISDIR set.  However, if clients may wish to enumerate the
+ * files in the filesystem, it is recommended to include all the
+ * appropriate parent directory "files" to give a consistent view.
+ *
+ * An invalid file inode will cause an HV_EBADF error to be returned.
+ *
+ * @param inode The inode number of the query
+ * @return An HV_FS_StatInfo structure
+ */
+HV_FS_StatInfo hv_fs_fstat(int inode);
+
+
+/** Read data from a specific hypervisor file.
+ * On error, may return HV_EBADF for a bad inode or HV_EFAULT for a bad buf.
+ * Reads near the end of the file will return fewer bytes than requested.
+ * Reads at or beyond the end of a file will return zero.
+ *
+ * @param inode the hypervisor file to read
+ * @param buf the buffer to read data into
+ * @param length the number of bytes of data to read
+ * @param offset the offset into the file to read the data from
+ * @return number of bytes successfully read, or an HV_Errno code
+ */
+int hv_fs_pread(int inode, HV_VirtAddr buf, int length, int offset);
+
+
+/** Read a 64-bit word from the specified physical address.
+ * The address must be 8-byte aligned.
+ * Specifying an invalid physical address will lead to client termination.
+ * @param addr The physical address to read
+ * @param access The PTE describing how to read the memory
+ * @return The 64-bit value read from the given address
+ */
+unsigned long long hv_physaddr_read64(HV_PhysAddr addr, HV_PTE access);
+
+
+/** Write a 64-bit word to the specified physical address.
+ * The address must be 8-byte aligned.
+ * Specifying an invalid physical address will lead to client termination.
+ * @param addr The physical address to write
+ * @param access The PTE that says how to write the memory
+ * @param val The 64-bit value to write to the given address
+ */
+void hv_physaddr_write64(HV_PhysAddr addr, HV_PTE access,
+                         unsigned long long val);
+
+
+/** Get the value of the command-line for the supervisor, if any.
+ * This will not include the filename of the booted supervisor, but may
+ * include configured-in boot arguments or the hv_restart() arguments.
+ * If the buffer is not long enough the hypervisor will NUL the first
+ * character of the buffer but not write any other data.
+ * @param buf The virtual address to write the command-line string to.
+ * @param length The length of buf, in characters.
+ * @return The actual length of the command line, including the trailing NUL
+ *         (may be larger than "length").
+ */
+int hv_get_command_line(HV_VirtAddr buf, int length);
+
+
+/** Set a new value for the command-line for the supervisor, which will
+ *  be returned from subsequent invocations of hv_get_command_line() on
+ *  this tile.
+ * @param buf The virtual address to read the command-line string from.
+ * @param length The length of buf, in characters; must be no more than
+ *        HV_COMMAND_LINE_LEN.
+ * @return Zero if successful, or a hypervisor error code.
+ */
+HV_Errno hv_set_command_line(HV_VirtAddr buf, int length);
+
+/** Maximum size of a command line passed to hv_set_command_line(); note
+ *  that a line returned from hv_get_command_line() could be larger than
+ *  this.*/
+#define HV_COMMAND_LINE_LEN  256
+
+/** Tell the hypervisor how to cache non-priority pages
+ * (its own as well as pages explicitly represented in page tables).
+ * Normally these will be represented as red/black pages, but
+ * when the supervisor starts to allocate "priority" pages in the PTE
+ * the hypervisor will need to start marking those pages as (e.g.) "red"
+ * and non-priority pages as either "black" (if they cache-alias
+ * with the existing priority pages) or "red/black" (if they don't).
+ * The bitmask provides information on which parts of the cache
+ * have been used for pinned pages so far on this tile; if (1 << N)
+ * appears in the bitmask, that indicates that a page has been marked
+ * "priority" whose PFN equals N, mod 8.
+ * @param bitmask A bitmap of priority page set values
+ */
+void hv_set_caching(unsigned int bitmask);
+
+
+/** Zero out a specified number of pages.
+ * The va and size must both be multiples of 4096.
+ * Caches are bypassed and memory is directly set to zero.
+ * This API is implemented only in the magic hypervisor and is intended
+ * to provide a performance boost to the minimal supervisor by
+ * giving it a fast way to zero memory pages when allocating them.
+ * @param va Virtual address where the page has been mapped
+ * @param size Number of bytes (must be a page size multiple)
+ */
+void hv_bzero_page(HV_VirtAddr va, unsigned int size);
+
+
+/** State object for the hypervisor messaging subsystem. */
+typedef struct
+{
+#if CHIP_VA_WIDTH() > 32
+  __hv64 opaque[2]; /**< No user-serviceable parts inside */
+#else
+  __hv32 opaque[2]; /**< No user-serviceable parts inside */
+#endif
+}
+HV_MsgState;
+
+/** Register to receive incoming messages.
+ *
+ *  This routine configures the current tile so that it can receive
+ *  incoming messages.  It must be called before the client can receive
+ *  messages with the hv_receive_message routine, and must be called on
+ *  each tile which will receive messages.
+ *
+ *  msgstate is the virtual address of a state object of type HV_MsgState.
+ *  Once the state is registered, the client must not read or write the
+ *  state object; doing so will cause undefined results.
+ *
+ *  If this routine is called with msgstate set to 0, the client's message
+ *  state will be freed and it will no longer be able to receive messages.
+ *  Note that this may cause the loss of any as-yet-undelivered messages
+ *  for the client.
+ *
+ *  If another client attempts to send a message to a client which has
+ *  not yet called hv_register_message_state, or which has freed its
+ *  message state, the message will not be delivered, as if the client
+ *  had insufficient buffering.
+ *
+ *  This routine returns HV_OK if the registration was successful, and
+ *  HV_EINVAL if the supplied state object is unsuitable.  Note that some
+ *  errors may not be detected during this routine, but might be detected
+ *  during a subsequent message delivery.
+ * @param msgstate State object.
+ **/
+HV_Errno hv_register_message_state(HV_MsgState* msgstate);
+
+/** Possible message recipient states. */
+typedef enum
+{
+  HV_TO_BE_SENT,    /**< Not sent (not attempted, or recipient not ready) */
+  HV_SENT,          /**< Successfully sent */
+  HV_BAD_RECIP      /**< Bad recipient coordinates (permanent error) */
+} HV_Recip_State;
+
+/** Message recipient. */
+typedef struct
+{
+  /** X coordinate, relative to supervisor's top-left coordinate */
+  unsigned int x:11;
+
+  /** Y coordinate, relative to supervisor's top-left coordinate */
+  unsigned int y:11;
+
+  /** Status of this recipient */
+  HV_Recip_State state:10;
+} HV_Recipient;
+
+/** Send a message to a set of recipients.
+ *
+ *  This routine sends a message to a set of recipients.
+ *
+ *  recips is an array of HV_Recipient structures.  Each specifies a tile,
+ *  and a message state; initially, it is expected that the state will
+ *  be set to HV_TO_BE_SENT.  nrecip specifies the number of recipients
+ *  in the recips array.
+ *
+ *  For each recipient whose state is HV_TO_BE_SENT, the hypervisor attempts
+ *  to send that tile the specified message.  In order to successfully
+ *  receive the message, the receiver must be a valid tile to which the
+ *  sender has access, must not be the sending tile itself, and must have
+ *  sufficient free buffer space.  (The hypervisor guarantees that each
+ *  tile which has called hv_register_message_state() will be able to
+ *  buffer one message from every other tile which can legally send to it;
+ *  more space may be provided but is not guaranteed.)  If an invalid tile
+ *  is specified, the recipient's state is set to HV_BAD_RECIP; this is a
+ *  permanent delivery error.  If the message is successfully delivered
+ *  to the recipient's buffer, the recipient's state is set to HV_SENT.
+ *  Otherwise, the recipient's state is unchanged.  Message delivery is
+ *  synchronous; all attempts to send messages are completed before this
+ *  routine returns.
+ *
+ *  If no permanent delivery errors were encountered, the routine returns
+ *  the number of messages successfully sent: that is, the number of
+ *  recipients whose states changed from HV_TO_BE_SENT to HV_SENT during
+ *  this operation.  If any permanent delivery errors were encountered,
+ *  the routine returns HV_ERECIP.  In the event of permanent delivery
+ *  errors, it may be the case that delivery was not attempted to all
+ *  recipients; if any messages were succesfully delivered, however,
+ *  recipients' state values will be updated appropriately.
+ *
+ *  It is explicitly legal to specify a recipient structure whose state
+ *  is not HV_TO_BE_SENT; such a recipient is ignored.  One suggested way
+ *  of using hv_send_message to send a message to multiple tiles is to set
+ *  up a list of recipients, and then call the routine repeatedly with the
+ *  same list, each time accumulating the number of messages successfully
+ *  sent, until all messages are sent, a permanent error is encountered,
+ *  or the desired number of attempts have been made.  When used in this
+ *  way, the routine will deliver each message no more than once to each
+ *  recipient.
+ *
+ *  Note that a message being successfully delivered to the recipient's
+ *  buffer space does not guarantee that it is received by the recipient,
+ *  either immediately or at any time in the future; the recipient might
+ *  never call hv_receive_message, or could register a different state
+ *  buffer, losing the message.
+ *
+ *  Specifiying the same recipient more than once in the recipient list
+ *  is an error, which will not result in an error return but which may
+ *  or may not result in more than one message being delivered to the
+ *  recipient tile.
+ *
+ *  buf and buflen specify the message to be sent.  buf is a virtual address
+ *  which must be currently mapped in the client's page table; if not, the
+ *  routine returns HV_EFAULT.  buflen must be greater than zero and less
+ *  than or equal to HV_MAX_MESSAGE_SIZE, and nrecip must be less than the
+ *  number of tiles to which the sender has access; if not, the routine
+ *  returns HV_EINVAL.
+ * @param recips List of recipients.
+ * @param nrecip Number of recipients.
+ * @param buf Address of message data.
+ * @param buflen Length of message data.
+ **/
+int hv_send_message(HV_Recipient *recips, int nrecip,
+                    HV_VirtAddr buf, int buflen);
+
+/** Maximum hypervisor message size, in bytes */
+#define HV_MAX_MESSAGE_SIZE 28
+
+
+/** Return value from hv_receive_message() */
+typedef struct
+{
+  int msglen;     /**< Message length in bytes, or an error code */
+  __hv32 source;  /**< Code identifying message sender (HV_MSG_xxx) */
+} HV_RcvMsgInfo;
+
+#define HV_MSG_TILE 0x0         /**< Message source is another tile */
+#define HV_MSG_INTR 0x1         /**< Message source is a driver interrupt */
+
+/** Receive a message.
+ *
+ * This routine retrieves a message from the client's incoming message
+ * buffer.
+ *
+ * Multiple messages sent from a particular sending tile to a particular
+ * receiving tile are received in the order that they were sent; however,
+ * no ordering is guaranteed between messages sent by different tiles.
+ *
+ * Whenever the a client's message buffer is empty, the first message
+ * subsequently received will cause the client's MESSAGE_RCV_DWNCL
+ * interrupt vector to be invoked through the interrupt downcall mechanism
+ * (see the description of the hv_downcall_dispatch() routine for details
+ * on downcalls).
+ *
+ * Another message-available downcall will not occur until a call to
+ * this routine is made when the message buffer is empty, and a message
+ * subsequently arrives.  Note that such a downcall could occur while
+ * this routine is executing.  If the calling code does not wish this
+ * to happen, it is recommended that this routine be called with the
+ * INTCTRL_1 interrupt masked, or inside an interrupt critical section.
+ *
+ * msgstate is the value previously passed to hv_register_message_state().
+ * buf is the virtual address of the buffer into which the message will
+ * be written; buflen is the length of the buffer.
+ *
+ * This routine returns an HV_RcvMsgInfo structure.  The msglen member
+ * of that structure is the length of the message received, zero if no
+ * message is available, or HV_E2BIG if the message is too large for the
+ * specified buffer.  If the message is too large, it is not consumed,
+ * and may be retrieved by a subsequent call to this routine specifying
+ * a sufficiently large buffer.  A buffer which is HV_MAX_MESSAGE_SIZE
+ * bytes long is guaranteed to be able to receive any possible message.
+ *
+ * The source member of the HV_RcvMsgInfo structure describes the sender
+ * of the message.  For messages sent by another client tile via an
+ * hv_send_message() call, this value is HV_MSG_TILE; for messages sent
+ * as a result of a device interrupt, this value is HV_MSG_INTR.
+ */
+
+HV_RcvMsgInfo hv_receive_message(HV_MsgState msgstate, HV_VirtAddr buf,
+                                 int buflen);
+
+
+/** Start remaining tiles owned by this supervisor.  Initially, only one tile
+ *  executes the client program; after it calls this service, the other tiles
+ *  are started.  This allows the initial tile to do one-time configuration
+ *  of shared data structures without having to lock them against simultaneous
+ *  access.
+ */
+void hv_start_all_tiles(void);
+
+
+/** Open a hypervisor device.
+ *
+ *  This service initializes an I/O device and its hypervisor driver software,
+ *  and makes it available for use.  The open operation is per-device per-chip;
+ *  once it has been performed, the device handle returned may be used in other
+ *  device services calls made by any tile.
+ *
+ * @param name Name of the device.  A base device name is just a text string
+ *        (say, "pcie").  If there is more than one instance of a device, the
+ *        base name is followed by a slash and a device number (say, "pcie/0").
+ *        Some devices may support further structure beneath those components;
+ *        most notably, devices which require control operations do so by
+ *        supporting reads and/or writes to a control device whose name
+ *        includes a trailing "/ctl" (say, "pcie/0/ctl").
+ * @param flags Flags (HV_DEV_xxx).
+ * @return A positive integer device handle, or a negative error code.
+ */
+int hv_dev_open(HV_VirtAddr name, __hv32 flags);
+
+
+/** Close a hypervisor device.
+ *
+ *  This service uninitializes an I/O device and its hypervisor driver
+ *  software, and makes it unavailable for use.  The close operation is
+ *  per-device per-chip; once it has been performed, the device is no longer
+ *  available.  Normally there is no need to ever call the close service.
+ *
+ * @param devhdl Device handle of the device to be closed.
+ * @return Zero if the close is successful, otherwise, a negative error code.
+ */
+int hv_dev_close(int devhdl);
+
+
+/** Read data from a hypervisor device synchronously.
+ *
+ *  This service transfers data from a hypervisor device to a memory buffer.
+ *  When the service returns, the data has been written from the memory buffer,
+ *  and the buffer will not be further modified by the driver.
+ *
+ *  No ordering is guaranteed between requests issued from different tiles.
+ *
+ *  Devices may choose to support both the synchronous and asynchronous read
+ *  operations, only one of them, or neither of them.
+ *
+ * @param devhdl Device handle of the device to be read from.
+ * @param flags Flags (HV_DEV_xxx).
+ * @param va Virtual address of the target data buffer.  This buffer must
+ *        be mapped in the currently installed page table; if not, HV_EFAULT
+ *        may be returned.
+ * @param len Number of bytes to be transferred.
+ * @param offset Driver-dependent offset.  For a random-access device, this is
+ *        often a byte offset from the beginning of the device; in other cases,
+ *        like on a control device, it may have a different meaning.
+ * @return A non-negative value if the read was at least partially successful;
+ *         otherwise, a negative error code.  The precise interpretation of
+ *         the return value is driver-dependent, but many drivers will return
+ *         the number of bytes successfully transferred.
+ */
+int hv_dev_pread(int devhdl, __hv32 flags, HV_VirtAddr va, __hv32 len,
+                 __hv64 offset);
+
+#define HV_DEV_NB_EMPTY     0x1   /**< Don't block when no bytes of data can
+                                       be transferred. */
+#define HV_DEV_NB_PARTIAL   0x2   /**< Don't block when some bytes, but not all
+                                       of the requested bytes, can be
+                                       transferred. */
+#define HV_DEV_NOCACHE      0x4   /**< The caller warrants that none of the
+                                       cache lines which might contain data
+                                       from the requested buffer are valid.
+                                       Useful with asynchronous operations
+                                       only. */
+
+#define HV_DEV_ALLFLAGS     (HV_DEV_NB_EMPTY | HV_DEV_NB_PARTIAL | \
+                             HV_DEV_NOCACHE)   /**< All HV_DEV_xxx flags */
+
+/** Write data to a hypervisor device synchronously.
+ *
+ *  This service transfers data from a memory buffer to a hypervisor device.
+ *  When the service returns, the data has been read from the memory buffer,
+ *  and the buffer may be overwritten by the client; the data may not
+ *  necessarily have been conveyed to the actual hardware I/O interface.
+ *
+ *  No ordering is guaranteed between requests issued from different tiles.
+ *
+ *  Devices may choose to support both the synchronous and asynchronous write
+ *  operations, only one of them, or neither of them.
+ *
+ * @param devhdl Device handle of the device to be written to.
+ * @param flags Flags (HV_DEV_xxx).
+ * @param va Virtual address of the source data buffer.  This buffer must
+ *        be mapped in the currently installed page table; if not, HV_EFAULT
+ *        may be returned.
+ * @param len Number of bytes to be transferred.
+ * @param offset Driver-dependent offset.  For a random-access device, this is
+ *        often a byte offset from the beginning of the device; in other cases,
+ *        like on a control device, it may have a different meaning.
+ * @return A non-negative value if the write was at least partially successful;
+ *         otherwise, a negative error code.  The precise interpretation of
+ *         the return value is driver-dependent, but many drivers will return
+ *         the number of bytes successfully transferred.
+ */
+int hv_dev_pwrite(int devhdl, __hv32 flags, HV_VirtAddr va, __hv32 len,
+                  __hv64 offset);
+
+
+/** Interrupt arguments, used in the asynchronous I/O interfaces. */
+#if CHIP_VA_WIDTH() > 32
+typedef __hv64 HV_IntArg;
+#else
+typedef __hv32 HV_IntArg;
+#endif
+
+/** Interrupt messages are delivered via the mechanism as normal messages,
+ *  but have a message source of HV_DEV_INTR.  The message is formatted
+ *  as an HV_IntrMsg structure.
+ */
+
+typedef struct
+{
+  HV_IntArg intarg;  /**< Interrupt argument, passed to the poll/preada/pwritea
+                          services */
+  HV_IntArg intdata; /**< Interrupt-specific interrupt data */
+} HV_IntrMsg;
+
+/** Request an interrupt message when a device condition is satisfied.
+ *
+ *  This service requests that an interrupt message be delivered to the
+ *  requesting tile when a device becomes readable or writable, or when any
+ *  data queued to the device via previous write operations from this tile
+ *  has been actually sent out on the hardware I/O interface.  Devices may
+ *  choose to support any, all, or none of the available conditions.
+ *
+ *  If multiple conditions are specified, only one message will be
+ *  delivered.  If the event mask delivered to that interrupt handler
+ *  indicates that some of the conditions have not yet occurred, the
+ *  client must issue another poll() call if it wishes to wait for those
+ *  conditions.
+ *
+ *  Only one poll may be outstanding per device handle per tile.  If more than
+ *  one tile is polling on the same device and condition, they will all be
+ *  notified when it happens.  Because of this, clients may not assume that
+ *  the condition signaled is necessarily still true when they request a
+ *  subsequent service; for instance, the readable data which caused the
+ *  poll call to interrupt may have been read by another tile in the interim.
+ *
+ *  The notification interrupt message could come directly, or via the
+ *  downcall (intctrl1) method, depending on what the tile is doing
+ *  when the condition is satisfied.  Note that it is possible for the
+ *  requested interrupt to be delivered after this service is called but
+ *  before it returns.
+ *
+ * @param devhdl Device handle of the device to be polled.
+ * @param events Flags denoting the events which will cause the interrupt to
+ *        be delivered (HV_DEVPOLL_xxx).
+ * @param intarg Value which will be delivered as the intarg member of the
+ *        eventual interrupt message; the intdata member will be set to a
+ *        mask of HV_DEVPOLL_xxx values indicating which conditions have been
+ *        satisifed.
+ * @return Zero if the interrupt was successfully scheduled; otherwise, a
+ *         negative error code.
+ */
+int hv_dev_poll(int devhdl, __hv32 events, HV_IntArg intarg);
+
+#define HV_DEVPOLL_READ     0x1   /**< Test device for readability */
+#define HV_DEVPOLL_WRITE    0x2   /**< Test device for writability */
+#define HV_DEVPOLL_FLUSH    0x4   /**< Test device for output drained */
+
+
+/** Cancel a request for an interrupt when a device event occurs.
+ *
+ *  This service requests that no interrupt be delivered when the events
+ *  noted in the last-issued poll() call happen.  Once this service returns,
+ *  the interrupt has been canceled; however, it is possible for the interrupt
+ *  to be delivered after this service is called but before it returns.
+ *
+ * @param devhdl Device handle of the device on which to cancel polling.
+ * @return Zero if the poll was successfully canceled; otherwise, a negative
+ *         error code.
+ */
+int hv_dev_poll_cancel(int devhdl);
+
+
+/** Scatter-gather list for preada/pwritea calls. */
+typedef struct
+#if CHIP_VA_WIDTH() <= 32
+__attribute__ ((packed, aligned(4)))
+#endif
+{
+  HV_PhysAddr pa;  /**< Client physical address of the buffer segment. */
+  HV_PTE pte;      /**< Page table entry describing the caching and location
+                        override characteristics of the buffer segment.  Some
+                        drivers ignore this element and will require that
+                        the NOCACHE flag be set on their requests. */
+  __hv32 len;      /**< Length of the buffer segment. */
+} HV_SGL;
+
+#define HV_SGL_MAXLEN 16  /**< Maximum number of entries in a scatter-gather
+                               list */
+
+/** Read data from a hypervisor device asynchronously.
+ *
+ *  This service transfers data from a hypervisor device to a memory buffer.
+ *  When the service returns, the read has been scheduled.  When the read
+ *  completes, an interrupt message will be delivered, and the buffer will
+ *  not be further modified by the driver.
+ *
+ *  The number of possible outstanding asynchronous requests is defined by
+ *  each driver, but it is recommended that it be at least two requests
+ *  per tile per device.
+ *
+ *  No ordering is guaranteed between synchronous and asynchronous requests,
+ *  even those issued on the same tile.
+ *
+ *  The completion interrupt message could come directly, or via the downcall
+ *  (intctrl1) method, depending on what the tile is doing when the read
+ *  completes.  Interrupts do not coalesce; one is delivered for each
+ *  asynchronous I/O request.  Note that it is possible for the requested
+ *  interrupt to be delivered after this service is called but before it
+ *  returns.
+ *
+ *  Devices may choose to support both the synchronous and asynchronous read
+ *  operations, only one of them, or neither of them.
+ *
+ * @param devhdl Device handle of the device to be read from.
+ * @param flags Flags (HV_DEV_xxx).
+ * @param sgl_len Number of elements in the scatter-gather list.
+ * @param sgl Scatter-gather list describing the memory to which data will be
+ *        written.
+ * @param offset Driver-dependent offset.  For a random-access device, this is
+ *        often a byte offset from the beginning of the device; in other cases,
+ *        like on a control device, it may have a different meaning.
+ * @param intarg Value which will be delivered as the intarg member of the
+ *        eventual interrupt message; the intdata member will be set to the
+ *        normal return value from the read request.
+ * @return Zero if the read was successfully scheduled; otherwise, a negative
+ *         error code.  Note that some drivers may choose to pre-validate
+ *         their arguments, and may thus detect certain device error
+ *         conditions at this time rather than when the completion notification
+ *         occurs, but this is not required.
+ */
+int hv_dev_preada(int devhdl, __hv32 flags, __hv32 sgl_len,
+                  HV_SGL sgl[/* sgl_len */], __hv64 offset, HV_IntArg intarg);
+
+
+/** Write data to a hypervisor device asynchronously.
+ *
+ *  This service transfers data from a memory buffer to a hypervisor
+ *  device.  When the service returns, the write has been scheduled.
+ *  When the write completes, an interrupt message will be delivered,
+ *  and the buffer may be overwritten by the client; the data may not
+ *  necessarily have been conveyed to the actual hardware I/O interface.
+ *
+ *  The number of possible outstanding asynchronous requests is defined by
+ *  each driver, but it is recommended that it be at least two requests
+ *  per tile per device.
+ *
+ *  No ordering is guaranteed between synchronous and asynchronous requests,
+ *  even those issued on the same tile.
+ *
+ *  The completion interrupt message could come directly, or via the downcall
+ *  (intctrl1) method, depending on what the tile is doing when the read
+ *  completes.  Interrupts do not coalesce; one is delivered for each
+ *  asynchronous I/O request.  Note that it is possible for the requested
+ *  interrupt to be delivered after this service is called but before it
+ *  returns.
+ *
+ *  Devices may choose to support both the synchronous and asynchronous write
+ *  operations, only one of them, or neither of them.
+ *
+ * @param devhdl Device handle of the device to be read from.
+ * @param flags Flags (HV_DEV_xxx).
+ * @param sgl_len Number of elements in the scatter-gather list.
+ * @param sgl Scatter-gather list describing the memory from which data will be
+ *        read.
+ * @param offset Driver-dependent offset.  For a random-access device, this is
+ *        often a byte offset from the beginning of the device; in other cases,
+ *        like on a control device, it may have a different meaning.
+ * @param intarg Value which will be delivered as the intarg member of the
+ *        eventual interrupt message; the intdata member will be set to the
+ *        normal return value from the write request.
+ * @return Zero if the write was successfully scheduled; otherwise, a negative
+ *         error code.  Note that some drivers may choose to pre-validate
+ *         their arguments, and may thus detect certain device error
+ *         conditions at this time rather than when the completion notification
+ *         occurs, but this is not required.
+ */
+int hv_dev_pwritea(int devhdl, __hv32 flags, __hv32 sgl_len,
+                   HV_SGL sgl[/* sgl_len */], __hv64 offset, HV_IntArg intarg);
+
+
+/** Define a pair of tile and ASID to identify a user process context. */
+typedef struct
+{
+  /** X coordinate, relative to supervisor's top-left coordinate */
+  unsigned int x:11;
+
+  /** Y coordinate, relative to supervisor's top-left coordinate */
+  unsigned int y:11;
+
+  /** ASID of the process on this x,y tile */
+  HV_ASID asid:10;
+} HV_Remote_ASID;
+
+/** Flush cache and/or TLB state on remote tiles.
+ *
+ * @param cache_pa Client physical address to flush from cache (ignored if
+ *        the length encoded in cache_control is zero, or if
+ *        HV_FLUSH_EVICT_L2 is set, or if cache_cpumask is NULL).
+ * @param cache_control This argument allows you to specify a length of
+ *        physical address space to flush (maximum HV_FLUSH_MAX_CACHE_LEN).
+ *        You can "or" in HV_FLUSH_EVICT_L2 to flush the whole L2 cache.
+ *        You can "or" in HV_FLUSH_EVICT_LI1 to flush the whole LII cache.
+ *        HV_FLUSH_ALL flushes all caches.
+ * @param cache_cpumask Bitmask (in row-major order, supervisor-relative) of
+ *        tile indices to perform cache flush on.  The low bit of the first
+ *        word corresponds to the tile at the upper left-hand corner of the
+ *        supervisor's rectangle.  If passed as a NULL pointer, equivalent
+ *        to an empty bitmask.  On chips which support hash-for-home caching,
+ *        if passed as -1, equivalent to a mask containing tiles which could
+ *        be doing hash-for-home caching.
+ * @param tlb_va Virtual address to flush from TLB (ignored if
+ *        tlb_length is zero or tlb_cpumask is NULL).
+ * @param tlb_length Number of bytes of data to flush from the TLB.
+ * @param tlb_pgsize Page size to use for TLB flushes.
+ *        tlb_va and tlb_length need not be aligned to this size.
+ * @param tlb_cpumask Bitmask for tlb flush, like cache_cpumask.
+ *        If passed as a NULL pointer, equivalent to an empty bitmask.
+ * @param asids Pointer to an HV_Remote_ASID array of tile/ASID pairs to flush.
+ * @param asidcount Number of HV_Remote_ASID entries in asids[].
+ * @return Zero for success, or else HV_EINVAL or HV_EFAULT for errors that
+ *        are detected while parsing the arguments.
+ */
+int hv_flush_remote(HV_PhysAddr cache_pa, unsigned long cache_control,
+                    unsigned long* cache_cpumask,
+                    HV_VirtAddr tlb_va, unsigned long tlb_length,
+                    unsigned long tlb_pgsize, unsigned long* tlb_cpumask,
+                    HV_Remote_ASID* asids, int asidcount);
+
+/** Include in cache_control to ensure a flush of the entire L2. */
+#define HV_FLUSH_EVICT_L2 (1UL << 31)
+
+/** Include in cache_control to ensure a flush of the entire L1I. */
+#define HV_FLUSH_EVICT_L1I (1UL << 30)
+
+/** Maximum legal size to use for the "length" component of cache_control. */
+#define HV_FLUSH_MAX_CACHE_LEN ((1UL << 30) - 1)
+
+/** Use for cache_control to ensure a flush of all caches. */
+#define HV_FLUSH_ALL -1UL
+
+#else   /* __ASSEMBLER__ */
+
+/** Include in cache_control to ensure a flush of the entire L2. */
+#define HV_FLUSH_EVICT_L2 (1 << 31)
+
+/** Include in cache_control to ensure a flush of the entire L1I. */
+#define HV_FLUSH_EVICT_L1I (1 << 30)
+
+/** Maximum legal size to use for the "length" component of cache_control. */
+#define HV_FLUSH_MAX_CACHE_LEN ((1 << 30) - 1)
+
+/** Use for cache_control to ensure a flush of all caches. */
+#define HV_FLUSH_ALL -1
+
+#endif  /* __ASSEMBLER__ */
+
+#ifndef __ASSEMBLER__
+
+/** Return a 64-bit value corresponding to the PTE if needed */
+#define hv_pte_val(pte) ((pte).val)
+
+/** Cast a 64-bit value to an HV_PTE */
+#define hv_pte(val) ((HV_PTE) { val })
+
+#endif  /* !__ASSEMBLER__ */
+
+
+/** Bits in the size of an HV_PTE */
+#define HV_LOG2_PTE_SIZE 3
+
+/** Size of an HV_PTE */
+#define HV_PTE_SIZE (1 << HV_LOG2_PTE_SIZE)
+
+
+/* Bits in HV_PTE's low word. */
+#define HV_PTE_INDEX_PRESENT          0  /**< PTE is valid */
+#define HV_PTE_INDEX_MIGRATING        1  /**< Page is migrating */
+#define HV_PTE_INDEX_CLIENT0          2  /**< Page client state 0 */
+#define HV_PTE_INDEX_CLIENT1          3  /**< Page client state 1 */
+#define HV_PTE_INDEX_NC               4  /**< L1$/L2$ incoherent with L3$ */
+#define HV_PTE_INDEX_NO_ALLOC_L1      5  /**< Page is uncached in local L1$ */
+#define HV_PTE_INDEX_NO_ALLOC_L2      6  /**< Page is uncached in local L2$ */
+#define HV_PTE_INDEX_CACHED_PRIORITY  7  /**< Page is priority cached */
+#define HV_PTE_INDEX_PAGE             8  /**< PTE describes a page */
+#define HV_PTE_INDEX_GLOBAL           9  /**< Page is global */
+#define HV_PTE_INDEX_USER            10  /**< Page is user-accessible */
+#define HV_PTE_INDEX_ACCESSED        11  /**< Page has been accessed */
+#define HV_PTE_INDEX_DIRTY           12  /**< Page has been written */
+                                         /*   Bits 13-15 are reserved for
+                                              future use. */
+#define HV_PTE_INDEX_MODE            16  /**< Page mode; see HV_PTE_MODE_xxx */
+#define HV_PTE_MODE_BITS              3  /**< Number of bits in mode */
+                                         /*   Bit 19 is reserved for
+                                              future use. */
+#define HV_PTE_INDEX_LOTAR           20  /**< Page's LOTAR; must be high bits
+                                              of word */
+#define HV_PTE_LOTAR_BITS            12  /**< Number of bits in a LOTAR */
+
+/* Bits in HV_PTE's high word. */
+#define HV_PTE_INDEX_READABLE        32  /**< Page is readable */
+#define HV_PTE_INDEX_WRITABLE        33  /**< Page is writable */
+#define HV_PTE_INDEX_EXECUTABLE      34  /**< Page is executable */
+#define HV_PTE_INDEX_PTFN            35  /**< Page's PTFN; must be high bits
+                                              of word */
+#define HV_PTE_PTFN_BITS             29  /**< Number of bits in a PTFN */
+
+/** Position of the PFN field within the PTE (subset of the PTFN). */
+#define HV_PTE_INDEX_PFN (HV_PTE_INDEX_PTFN + (HV_LOG2_PAGE_SIZE_SMALL - \
+                                               HV_LOG2_PAGE_TABLE_ALIGN))
+
+/** Length of the PFN field within the PTE (subset of the PTFN). */
+#define HV_PTE_INDEX_PFN_BITS (HV_PTE_INDEX_PTFN_BITS - \
+                               (HV_LOG2_PAGE_SIZE_SMALL - \
+                                HV_LOG2_PAGE_TABLE_ALIGN))
+
+/*
+ * Legal values for the PTE's mode field
+ */
+/** Data is not resident in any caches; loads and stores access memory
+ *  directly.
+ */
+#define HV_PTE_MODE_UNCACHED          1
+
+/** Data is resident in the tile's local L1 and/or L2 caches; if a load
+ *  or store misses there, it goes to memory.
+ *
+ *  The copy in the local L1$/L2$ is not invalidated when the copy in
+ *  memory is changed.
+ */
+#define HV_PTE_MODE_CACHE_NO_L3       2
+
+/** Data is resident in the tile's local L1 and/or L2 caches.  If a load
+ *  or store misses there, it goes to an L3 cache in a designated tile;
+ *  if it misses there, it goes to memory.
+ *
+ *  If the NC bit is not set, the copy in the local L1$/L2$ is invalidated
+ *  when the copy in the remote L3$ is changed.  Otherwise, such
+ *  invalidation will not occur.
+ *
+ *  Chips for which CHIP_HAS_COHERENT_LOCAL_CACHE() is 0 do not support
+ *  invalidation from an L3$ to another tile's L1$/L2$.  If the NC bit is
+ *  clear on such a chip, no copy is kept in the local L1$/L2$ in this mode.
+ */
+#define HV_PTE_MODE_CACHE_TILE_L3     3
+
+/** Data is resident in the tile's local L1 and/or L2 caches.  If a load
+ *  or store misses there, it goes to an L3 cache in one of a set of
+ *  designated tiles; if it misses there, it goes to memory.  Which tile
+ *  is chosen from the set depends upon a hash function applied to the
+ *  physical address.  This mode is not supported on chips for which
+ *  CHIP_HAS_CBOX_HOME_MAP() is 0.
+ *
+ *  If the NC bit is not set, the copy in the local L1$/L2$ is invalidated
+ *  when the copy in the remote L3$ is changed.  Otherwise, such
+ *  invalidation will not occur.
+ *
+ *  Chips for which CHIP_HAS_COHERENT_LOCAL_CACHE() is 0 do not support
+ *  invalidation from an L3$ to another tile's L1$/L2$.  If the NC bit is
+ *  clear on such a chip, no copy is kept in the local L1$/L2$ in this mode.
+ */
+#define HV_PTE_MODE_CACHE_HASH_L3     4
+
+/** Data is not resident in memory; accesses are instead made to an I/O
+ *  device, whose tile coordinates are given by the PTE's LOTAR field.
+ *  This mode is only supported on chips for which CHIP_HAS_MMIO() is 1.
+ *  The EXECUTABLE bit may not be set in an MMIO PTE.
+ */
+#define HV_PTE_MODE_MMIO              5
+
+
+/* C wants 1ULL so it is typed as __hv64, but the assembler needs just numbers.
+ * The assembler can't handle shifts greater than 31, but treats them
+ * as shifts mod 32, so assembler code must be aware of which word
+ * the bit belongs in when using these macros.
+ */
+#ifdef __ASSEMBLER__
+#define __HV_PTE_ONE 1        /**< One, for assembler */
+#else
+#define __HV_PTE_ONE 1ULL     /**< One, for C */
+#endif
+
+/** Is this PTE present?
+ *
+ * If this bit is set, this PTE represents a valid translation or level-2
+ * page table pointer.  Otherwise, the page table does not contain a
+ * translation for the subject virtual pages.
+ *
+ * If this bit is not set, the other bits in the PTE are not
+ * interpreted by the hypervisor, and may contain any value.
+ */
+#define HV_PTE_PRESENT               (__HV_PTE_ONE << HV_PTE_INDEX_PRESENT)
+
+/** Does this PTE map a page?
+ *
+ * If this bit is set in the level-1 page table, the entry should be
+ * interpreted as a level-2 page table entry mapping a large page.
+ *
+ * This bit should not be modified by the client while PRESENT is set, as
+ * doing so may race with the hypervisor's update of ACCESSED and DIRTY bits.
+ *
+ * In a level-2 page table, this bit is ignored and must be zero.
+ */
+#define HV_PTE_PAGE                  (__HV_PTE_ONE << HV_PTE_INDEX_PAGE)
+
+/** Is this a global (non-ASID) mapping?
+ *
+ * If this bit is set, the translations established by this PTE will
+ * not be flushed from the TLB by the hv_flush_asid() service; they
+ * will be flushed by the hv_flush_page() or hv_flush_pages() services.
+ *
+ * Setting this bit for translations which are identical in all page
+ * tables (for instance, code and data belonging to a client OS) can
+ * be very beneficial, as it will reduce the number of TLB misses.
+ * Note that, while it is not an error which will be detected by the
+ * hypervisor, it is an extremely bad idea to set this bit for
+ * translations which are _not_ identical in all page tables.
+ *
+ * This bit should not be modified by the client while PRESENT is set, as
+ * doing so may race with the hypervisor's update of ACCESSED and DIRTY bits.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_GLOBAL                (__HV_PTE_ONE << HV_PTE_INDEX_GLOBAL)
+
+/** Is this mapping accessible to users?
+ *
+ * If this bit is set, code running at any PL will be permitted to
+ * access the virtual addresses mapped by this PTE.  Otherwise, only
+ * code running at PL 1 or above will be allowed to do so.
+ *
+ * This bit should not be modified by the client while PRESENT is set, as
+ * doing so may race with the hypervisor's update of ACCESSED and DIRTY bits.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_USER                  (__HV_PTE_ONE << HV_PTE_INDEX_USER)
+
+/** Has this mapping been accessed?
+ *
+ * This bit is set by the hypervisor when the memory described by the
+ * translation is accessed for the first time.  It is never cleared by
+ * the hypervisor, but may be cleared by the client.  After the bit
+ * has been cleared, subsequent references are not guaranteed to set
+ * it again until the translation has been flushed from the TLB.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_ACCESSED              (__HV_PTE_ONE << HV_PTE_INDEX_ACCESSED)
+
+/** Is this mapping dirty?
+ *
+ * This bit is set by the hypervisor when the memory described by the
+ * translation is written for the first time.  It is never cleared by
+ * the hypervisor, but may be cleared by the client.  After the bit
+ * has been cleared, subsequent references are not guaranteed to set
+ * it again until the translation has been flushed from the TLB.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_DIRTY                 (__HV_PTE_ONE << HV_PTE_INDEX_DIRTY)
+
+/** Migrating bit in PTE.
+ *
+ * This bit is guaranteed not to be inspected or modified by the
+ * hypervisor.  The name is indicative of the suggested use by the client
+ * to tag pages whose L3 cache is being migrated from one cpu to another.
+ */
+#define HV_PTE_MIGRATING             (__HV_PTE_ONE << HV_PTE_INDEX_MIGRATING)
+
+/** Client-private bit in PTE.
+ *
+ * This bit is guaranteed not to be inspected or modified by the
+ * hypervisor.
+ */
+#define HV_PTE_CLIENT0               (__HV_PTE_ONE << HV_PTE_INDEX_CLIENT0)
+
+/** Client-private bit in PTE.
+ *
+ * This bit is guaranteed not to be inspected or modified by the
+ * hypervisor.
+ */
+#define HV_PTE_CLIENT1               (__HV_PTE_ONE << HV_PTE_INDEX_CLIENT1)
+
+/** Non-coherent (NC) bit in PTE.
+ *
+ * If this bit is set, the mapping that is set up will be non-coherent
+ * (also known as non-inclusive).  This means that changes to the L3
+ * cache will not cause a local copy to be invalidated.  It is generally
+ * recommended only for read-only mappings.
+ *
+ * In level-1 PTEs, if the Page bit is clear, this bit determines how the
+ * level-2 page table is accessed.
+ */
+#define HV_PTE_NC                    (__HV_PTE_ONE << HV_PTE_INDEX_NC)
+
+/** Is this page prevented from filling the L1$?
+ *
+ * If this bit is set, the page described by the PTE will not be cached
+ * the local cpu's L1 cache.
+ *
+ * If CHIP_HAS_NC_AND_NOALLOC_BITS() is not true in <chip.h> for this chip,
+ * it is illegal to use this attribute, and may cause client termination.
+ *
+ * In level-1 PTEs, if the Page bit is clear, this bit
+ * determines how the level-2 page table is accessed.
+ */
+#define HV_PTE_NO_ALLOC_L1           (__HV_PTE_ONE << HV_PTE_INDEX_NO_ALLOC_L1)
+
+/** Is this page prevented from filling the L2$?
+ *
+ * If this bit is set, the page described by the PTE will not be cached
+ * the local cpu's L2 cache.
+ *
+ * If CHIP_HAS_NC_AND_NOALLOC_BITS() is not true in <chip.h> for this chip,
+ * it is illegal to use this attribute, and may cause client termination.
+ *
+ * In level-1 PTEs, if the Page bit is clear, this bit determines how the
+ * level-2 page table is accessed.
+ */
+#define HV_PTE_NO_ALLOC_L2           (__HV_PTE_ONE << HV_PTE_INDEX_NO_ALLOC_L2)
+
+/** Is this a priority page?
+ *
+ * If this bit is set, the page described by the PTE will be given
+ * priority in the cache.  Normally this translates into allowing the
+ * page to use only the "red" half of the cache.  The client may wish to
+ * then use the hv_set_caching service to specify that other pages which
+ * alias this page will use only the "black" half of the cache.
+ *
+ * If the Cached Priority bit is clear, the hypervisor uses the
+ * current hv_set_caching() value to choose how to cache the page.
+ *
+ * It is illegal to set the Cached Priority bit if the Non-Cached bit
+ * is set and the Cached Remotely bit is clear, i.e. if requests to
+ * the page map directly to memory.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_CACHED_PRIORITY       (__HV_PTE_ONE << \
+                                      HV_PTE_INDEX_CACHED_PRIORITY)
+
+/** Is this a readable mapping?
+ *
+ * If this bit is set, code will be permitted to read from (e.g.,
+ * issue load instructions against) the virtual addresses mapped by
+ * this PTE.
+ *
+ * It is illegal for this bit to be clear if the Writable bit is set.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_READABLE              (__HV_PTE_ONE << HV_PTE_INDEX_READABLE)
+
+/** Is this a writable mapping?
+ *
+ * If this bit is set, code will be permitted to write to (e.g., issue
+ * store instructions against) the virtual addresses mapped by this
+ * PTE.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_WRITABLE              (__HV_PTE_ONE << HV_PTE_INDEX_WRITABLE)
+
+/** Is this an executable mapping?
+ *
+ * If this bit is set, code will be permitted to execute from
+ * (e.g., jump to) the virtual addresses mapped by this PTE.
+ *
+ * This bit applies to any processor on the tile, if there are more
+ * than one.
+ *
+ * This bit is ignored in level-1 PTEs unless the Page bit is set.
+ */
+#define HV_PTE_EXECUTABLE            (__HV_PTE_ONE << HV_PTE_INDEX_EXECUTABLE)
+
+/** The width of a LOTAR's x or y bitfield. */
+#define HV_LOTAR_WIDTH 11
+
+/** Converts an x,y pair to a LOTAR value. */
+#define HV_XY_TO_LOTAR(x, y) ((HV_LOTAR)(((x) << HV_LOTAR_WIDTH) | (y)))
+
+/** Extracts the X component of a lotar. */
+#define HV_LOTAR_X(lotar) ((lotar) >> HV_LOTAR_WIDTH)
+
+/** Extracts the Y component of a lotar. */
+#define HV_LOTAR_Y(lotar) ((lotar) & ((1 << HV_LOTAR_WIDTH) - 1))
+
+#ifndef __ASSEMBLER__
+
+/** Define accessor functions for a PTE bit. */
+#define _HV_BIT(name, bit)                                      \
+static __inline int                                             \
+hv_pte_get_##name(HV_PTE pte)                                   \
+{                                                               \
+  return (pte.val >> HV_PTE_INDEX_##bit) & 1;                   \
+}                                                               \
+                                                                \
+static __inline HV_PTE                                          \
+hv_pte_set_##name(HV_PTE pte)                                   \
+{                                                               \
+  pte.val |= 1ULL << HV_PTE_INDEX_##bit;                        \
+  return pte;                                                   \
+}                                                               \
+                                                                \
+static __inline HV_PTE                                          \
+hv_pte_clear_##name(HV_PTE pte)                                 \
+{                                                               \
+  pte.val &= ~(1ULL << HV_PTE_INDEX_##bit);                     \
+  return pte;                                                   \
+}
+
+/* Generate accessors to get, set, and clear various PTE flags.
+ */
+_HV_BIT(present,         PRESENT)
+_HV_BIT(page,            PAGE)
+_HV_BIT(client0,         CLIENT0)
+_HV_BIT(client1,         CLIENT1)
+_HV_BIT(migrating,       MIGRATING)
+_HV_BIT(nc,              NC)
+_HV_BIT(readable,        READABLE)
+_HV_BIT(writable,        WRITABLE)
+_HV_BIT(executable,      EXECUTABLE)
+_HV_BIT(accessed,        ACCESSED)
+_HV_BIT(dirty,           DIRTY)
+_HV_BIT(no_alloc_l1,     NO_ALLOC_L1)
+_HV_BIT(no_alloc_l2,     NO_ALLOC_L2)
+_HV_BIT(cached_priority, CACHED_PRIORITY)
+_HV_BIT(global,          GLOBAL)
+_HV_BIT(user,            USER)
+
+#undef _HV_BIT
+
+/** Get the page mode from the PTE.
+ *
+ * This field generally determines whether and how accesses to the page
+ * are cached; the HV_PTE_MODE_xxx symbols define the legal values for the
+ * page mode.  The NC, NO_ALLOC_L1, and NO_ALLOC_L2 bits modify this
+ * general policy.
+ */
+static __inline unsigned int
+hv_pte_get_mode(const HV_PTE pte)
+{
+  return (((__hv32) pte.val) >> HV_PTE_INDEX_MODE) &
+         ((1 << HV_PTE_MODE_BITS) - 1);
+}
+
+/** Set the page mode into a PTE.  See hv_pte_get_mode. */
+static __inline HV_PTE
+hv_pte_set_mode(HV_PTE pte, unsigned int val)
+{
+  pte.val &= ~(((1ULL << HV_PTE_MODE_BITS) - 1) << HV_PTE_INDEX_MODE);
+  pte.val |= val << HV_PTE_INDEX_MODE;
+  return pte;
+}
+
+/** Get the page frame number from the PTE.
+ *
+ * This field contains the upper bits of the CPA (client physical
+ * address) of the target page; the complete CPA is this field with
+ * HV_LOG2_PAGE_SIZE_SMALL zero bits appended to it.
+ *
+ * For PTEs in a level-1 page table where the Page bit is set, the
+ * CPA must be aligned modulo the large page size.
+ */
+static __inline unsigned int
+hv_pte_get_pfn(const HV_PTE pte)
+{
+  return pte.val >> HV_PTE_INDEX_PFN;
+}
+
+
+/** Set the page frame number into a PTE.  See hv_pte_get_pfn. */
+static __inline HV_PTE
+hv_pte_set_pfn(HV_PTE pte, unsigned int val)
+{
+  /*
+   * Note that the use of "PTFN" in the next line is intentional; we
+   * don't want any garbage lower bits left in that field.
+   */
+  pte.val &= ~(((1ULL << HV_PTE_PTFN_BITS) - 1) << HV_PTE_INDEX_PTFN);
+  pte.val |= (__hv64) val << HV_PTE_INDEX_PFN;
+  return pte;
+}
+
+/** Get the page table frame number from the PTE.
+ *
+ * This field contains the upper bits of the CPA (client physical
+ * address) of the target page table; the complete CPA is this field with
+ * with HV_PAGE_TABLE_ALIGN zero bits appended to it.
+ *
+ * For PTEs in a level-1 page table when the Page bit is not set, the
+ * CPA must be aligned modulo the sticter of HV_PAGE_TABLE_ALIGN and
+ * the level-2 page table size.
+ */
+static __inline unsigned long
+hv_pte_get_ptfn(const HV_PTE pte)
+{
+  return pte.val >> HV_PTE_INDEX_PTFN;
+}
+
+
+/** Set the page table frame number into a PTE.  See hv_pte_get_ptfn. */
+static __inline HV_PTE
+hv_pte_set_ptfn(HV_PTE pte, unsigned long val)
+{
+  pte.val &= ~(((1ULL << HV_PTE_PTFN_BITS)-1) << HV_PTE_INDEX_PTFN);
+  pte.val |= (__hv64) val << HV_PTE_INDEX_PTFN;
+  return pte;
+}
+
+
+/** Get the remote tile caching this page.
+ *
+ * Specifies the remote tile which is providing the L3 cache for this page.
+ *
+ * This field is ignored unless the page mode is HV_PTE_MODE_CACHE_TILE_L3.
+ *
+ * In level-1 PTEs, if the Page bit is clear, this field determines how the
+ * level-2 page table is accessed.
+ */
+static __inline unsigned int
+hv_pte_get_lotar(const HV_PTE pte)
+{
+  unsigned int lotar = ((__hv32) pte.val) >> HV_PTE_INDEX_LOTAR;
+
+  return HV_XY_TO_LOTAR( (lotar >> (HV_PTE_LOTAR_BITS / 2)),
+                         (lotar & ((1 << (HV_PTE_LOTAR_BITS / 2)) - 1)) );
+}
+
+
+/** Set the remote tile caching a page into a PTE.  See hv_pte_get_lotar. */
+static __inline HV_PTE
+hv_pte_set_lotar(HV_PTE pte, unsigned int val)
+{
+  unsigned int x = HV_LOTAR_X(val);
+  unsigned int y = HV_LOTAR_Y(val);
+
+  pte.val &= ~(((1ULL << HV_PTE_LOTAR_BITS)-1) << HV_PTE_INDEX_LOTAR);
+  pte.val |= (x << (HV_PTE_INDEX_LOTAR + HV_PTE_LOTAR_BITS / 2)) |
+             (y << HV_PTE_INDEX_LOTAR);
+  return pte;
+}
+
+#endif  /* !__ASSEMBLER__ */
+
+/** Converts a client physical address to a pfn. */
+#define HV_CPA_TO_PFN(p) ((p) >> HV_LOG2_PAGE_SIZE_SMALL)
+
+/** Converts a pfn to a client physical address. */
+#define HV_PFN_TO_CPA(p) (((HV_PhysAddr)(p)) << HV_LOG2_PAGE_SIZE_SMALL)
+
+/** Converts a client physical address to a ptfn. */
+#define HV_CPA_TO_PTFN(p) ((p) >> HV_LOG2_PAGE_TABLE_ALIGN)
+
+/** Converts a ptfn to a client physical address. */
+#define HV_PTFN_TO_CPA(p) (((HV_PhysAddr)(p)) << HV_LOG2_PAGE_TABLE_ALIGN)
+
+/** Converts a ptfn to a pfn. */
+#define HV_PTFN_TO_PFN(p) \
+  ((p) >> (HV_LOG2_PAGE_SIZE_SMALL - HV_LOG2_PAGE_TABLE_ALIGN))
+
+/** Converts a pfn to a ptfn. */
+#define HV_PFN_TO_PTFN(p) \
+  ((p) << (HV_LOG2_PAGE_SIZE_SMALL - HV_LOG2_PAGE_TABLE_ALIGN))
+
+#if CHIP_VA_WIDTH() > 32
+
+/** Log number of HV_PTE entries in L0 page table */
+#define HV_LOG2_L0_ENTRIES (CHIP_VA_WIDTH() - HV_LOG2_L1_SPAN)
+
+/** Number of HV_PTE entries in L0 page table */
+#define HV_L0_ENTRIES (1 << HV_LOG2_L0_ENTRIES)
+
+/** Log size of L0 page table in bytes */
+#define HV_LOG2_L0_SIZE (HV_LOG2_PTE_SIZE + HV_LOG2_L0_ENTRIES)
+
+/** Size of L0 page table in bytes */
+#define HV_L0_SIZE (1 << HV_LOG2_L0_SIZE)
+
+#ifdef __ASSEMBLER__
+
+/** Index in L0 for a specific VA */
+#define HV_L0_INDEX(va) \
+  (((va) >> HV_LOG2_L1_SPAN) & (HV_L0_ENTRIES - 1))
+
+#else
+
+/** Index in L1 for a specific VA */
+#define HV_L0_INDEX(va) \
+  (((HV_VirtAddr)(va) >> HV_LOG2_L1_SPAN) & (HV_L0_ENTRIES - 1))
+
+#endif
+
+#endif /* CHIP_VA_WIDTH() > 32 */
+
+/** Log number of HV_PTE entries in L1 page table */
+#define HV_LOG2_L1_ENTRIES (HV_LOG2_L1_SPAN - HV_LOG2_PAGE_SIZE_LARGE)
+
+/** Number of HV_PTE entries in L1 page table */
+#define HV_L1_ENTRIES (1 << HV_LOG2_L1_ENTRIES)
+
+/** Log size of L1 page table in bytes */
+#define HV_LOG2_L1_SIZE (HV_LOG2_PTE_SIZE + HV_LOG2_L1_ENTRIES)
+
+/** Size of L1 page table in bytes */
+#define HV_L1_SIZE (1 << HV_LOG2_L1_SIZE)
+
+/** Log number of HV_PTE entries in level-2 page table */
+#define HV_LOG2_L2_ENTRIES (HV_LOG2_PAGE_SIZE_LARGE - HV_LOG2_PAGE_SIZE_SMALL)
+
+/** Number of HV_PTE entries in level-2 page table */
+#define HV_L2_ENTRIES (1 << HV_LOG2_L2_ENTRIES)
+
+/** Log size of level-2 page table in bytes */
+#define HV_LOG2_L2_SIZE (HV_LOG2_PTE_SIZE + HV_LOG2_L2_ENTRIES)
+
+/** Size of level-2 page table in bytes */
+#define HV_L2_SIZE (1 << HV_LOG2_L2_SIZE)
+
+#ifdef __ASSEMBLER__
+
+#if CHIP_VA_WIDTH() > 32
+
+/** Index in L1 for a specific VA */
+#define HV_L1_INDEX(va) \
+  (((va) >> HV_LOG2_PAGE_SIZE_LARGE) & (HV_L1_ENTRIES - 1))
+
+#else /* CHIP_VA_WIDTH() > 32 */
+
+/** Index in L1 for a specific VA */
+#define HV_L1_INDEX(va) \
+  (((va) >> HV_LOG2_PAGE_SIZE_LARGE))
+
+#endif /* CHIP_VA_WIDTH() > 32 */
+
+/** Index in level-2 page table for a specific VA */
+#define HV_L2_INDEX(va) \
+  (((va) >> HV_LOG2_PAGE_SIZE_SMALL) & (HV_L2_ENTRIES - 1))
+
+#else /* __ASSEMBLER __ */
+
+#if CHIP_VA_WIDTH() > 32
+
+/** Index in L1 for a specific VA */
+#define HV_L1_INDEX(va) \
+  (((HV_VirtAddr)(va) >> HV_LOG2_PAGE_SIZE_LARGE) & (HV_L1_ENTRIES - 1))
+
+#else /* CHIP_VA_WIDTH() > 32 */
+
+/** Index in L1 for a specific VA */
+#define HV_L1_INDEX(va) \
+  (((HV_VirtAddr)(va) >> HV_LOG2_PAGE_SIZE_LARGE))
+
+#endif /* CHIP_VA_WIDTH() > 32 */
+
+/** Index in level-2 page table for a specific VA */
+#define HV_L2_INDEX(va) \
+  (((HV_VirtAddr)(va) >> HV_LOG2_PAGE_SIZE_SMALL) & (HV_L2_ENTRIES - 1))
+
+#endif /* __ASSEMBLER __ */
+
+#endif /* _TILE_HV_H */