ia64/xen: define helper functions for xen hypercalls.

introduce helper functions for xen hypercalls which
traps to hypervisor.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 129 insertions, 0 deletions

diff --git a/arch/ia64/include/asm/xen/privop.h b/arch/ia64/include/asm/xen/privop.h
new file mode 100644
index 000000000000..71ec7546e100
--- /dev/null
+++ b/arch/ia64/include/asm/xen/privop.h
@@ -0,0 +1,129 @@
+#ifndef _ASM_IA64_XEN_PRIVOP_H
+#define _ASM_IA64_XEN_PRIVOP_H
+
+/*
+ * Copyright (C) 2005 Hewlett-Packard Co
+ *      Dan Magenheimer <dan.magenheimer@hp.com>
+ *
+ * Paravirtualizations of privileged operations for Xen/ia64
+ *
+ *
+ * inline privop and paravirt_alt support
+ * Copyright (c) 2007 Isaku Yamahata <yamahata at valinux co jp>
+ *                    VA Linux Systems Japan K.K.
+ *
+ */
+
+#ifndef __ASSEMBLY__
+#include <linux/types.h>                /* arch-ia64.h requires uint64_t */
+#endif
+#include <asm/xen/interface.h>
+
+/* At 1 MB, before per-cpu space but still addressable using addl instead
+   of movl. */
+#define XSI_BASE                        0xfffffffffff00000
+
+/* Address of mapped regs.  */
+#define XMAPPEDREGS_BASE                (XSI_BASE + XSI_SIZE)
+
+#ifdef __ASSEMBLY__
+#define XEN_HYPER_RFI                   break HYPERPRIVOP_RFI
+#define XEN_HYPER_RSM_PSR_DT            break HYPERPRIVOP_RSM_DT
+#define XEN_HYPER_SSM_PSR_DT            break HYPERPRIVOP_SSM_DT
+#define XEN_HYPER_COVER                 break HYPERPRIVOP_COVER
+#define XEN_HYPER_ITC_D                 break HYPERPRIVOP_ITC_D
+#define XEN_HYPER_ITC_I                 break HYPERPRIVOP_ITC_I
+#define XEN_HYPER_SSM_I                 break HYPERPRIVOP_SSM_I
+#define XEN_HYPER_GET_IVR               break HYPERPRIVOP_GET_IVR
+#define XEN_HYPER_THASH                 break HYPERPRIVOP_THASH
+#define XEN_HYPER_ITR_D                 break HYPERPRIVOP_ITR_D
+#define XEN_HYPER_SET_KR                break HYPERPRIVOP_SET_KR
+#define XEN_HYPER_GET_PSR               break HYPERPRIVOP_GET_PSR
+#define XEN_HYPER_SET_RR0_TO_RR4        break HYPERPRIVOP_SET_RR0_TO_RR4
+
+#define XSI_IFS                         (XSI_BASE + XSI_IFS_OFS)
+#define XSI_PRECOVER_IFS                (XSI_BASE + XSI_PRECOVER_IFS_OFS)
+#define XSI_IFA                         (XSI_BASE + XSI_IFA_OFS)
+#define XSI_ISR                         (XSI_BASE + XSI_ISR_OFS)
+#define XSI_IIM                         (XSI_BASE + XSI_IIM_OFS)
+#define XSI_ITIR                        (XSI_BASE + XSI_ITIR_OFS)
+#define XSI_PSR_I_ADDR                  (XSI_BASE + XSI_PSR_I_ADDR_OFS)
+#define XSI_PSR_IC                      (XSI_BASE + XSI_PSR_IC_OFS)
+#define XSI_IPSR                        (XSI_BASE + XSI_IPSR_OFS)
+#define XSI_IIP                         (XSI_BASE + XSI_IIP_OFS)
+#define XSI_B1NAT                       (XSI_BASE + XSI_B1NATS_OFS)
+#define XSI_BANK1_R16                   (XSI_BASE + XSI_BANK1_R16_OFS)
+#define XSI_BANKNUM                     (XSI_BASE + XSI_BANKNUM_OFS)
+#define XSI_IHA                         (XSI_BASE + XSI_IHA_OFS)
+#endif
+
+#ifndef __ASSEMBLY__
+
+/************************************************/
+/* Instructions paravirtualized for correctness */
+/************************************************/
+
+/* "fc" and "thash" are privilege-sensitive instructions, meaning they
+ *  may have different semantics depending on whether they are executed
+ *  at PL0 vs PL!=0.  When paravirtualized, these instructions mustn't
+ *  be allowed to execute directly, lest incorrect semantics result. */
+extern void xen_fc(unsigned long addr);
+extern unsigned long xen_thash(unsigned long addr);
+
+/* Note that "ttag" and "cover" are also privilege-sensitive; "ttag"
+ * is not currently used (though it may be in a long-format VHPT system!)
+ * and the semantics of cover only change if psr.ic is off which is very
+ * rare (and currently non-existent outside of assembly code */
+
+/* There are also privilege-sensitive registers.  These registers are
+ * readable at any privilege level but only writable at PL0. */
+extern unsigned long xen_get_cpuid(int index);
+extern unsigned long xen_get_pmd(int index);
+
+extern unsigned long xen_get_eflag(void);       /* see xen_ia64_getreg */
+extern void xen_set_eflag(unsigned long);       /* see xen_ia64_setreg */
+
+/************************************************/
+/* Instructions paravirtualized for performance */
+/************************************************/
+
+/* Xen uses memory-mapped virtual privileged registers for access to many
+ * performance-sensitive privileged registers.  Some, like the processor
+ * status register (psr), are broken up into multiple memory locations.
+ * Others, like "pend", are abstractions based on privileged registers.
+ * "Pend" is guaranteed to be set if reading cr.ivr would return a
+ * (non-spurious) interrupt. */
+#define XEN_MAPPEDREGS ((struct mapped_regs *)XMAPPEDREGS_BASE)
+
+#define XSI_PSR_I                       \
+        (*XEN_MAPPEDREGS->interrupt_mask_addr)
+#define xen_get_virtual_psr_i()         \
+        (!XSI_PSR_I)
+#define xen_set_virtual_psr_i(_val)     \
+        ({ XSI_PSR_I = (uint8_t)(_val) ? 0 : 1; })
+#define xen_set_virtual_psr_ic(_val)    \
+        ({ XEN_MAPPEDREGS->interrupt_collection_enabled = _val ? 1 : 0; })
+#define xen_get_virtual_pend()          \
+        (*(((uint8_t *)XEN_MAPPEDREGS->interrupt_mask_addr) - 1))
+
+/* Although all privileged operations can be left to trap and will
+ * be properly handled by Xen, some are frequent enough that we use
+ * hyperprivops for performance. */
+extern unsigned long xen_get_psr(void);
+extern unsigned long xen_get_ivr(void);
+extern unsigned long xen_get_tpr(void);
+extern void xen_hyper_ssm_i(void);
+extern void xen_set_itm(unsigned long);
+extern void xen_set_tpr(unsigned long);
+extern void xen_eoi(unsigned long);
+extern unsigned long xen_get_rr(unsigned long index);
+extern void xen_set_rr(unsigned long index, unsigned long val);
+extern void xen_set_rr0_to_rr4(unsigned long val0, unsigned long val1,
+                               unsigned long val2, unsigned long val3,
+                               unsigned long val4);
+extern void xen_set_kr(unsigned long index, unsigned long val);
+extern void xen_ptcga(unsigned long addr, unsigned long size);
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_IA64_XEN_PRIVOP_H */