Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 776 insertions, 0 deletions

diff --git a/include/asm-ppc/pgtable.h b/include/asm-ppc/pgtable.h
new file mode 100644
index 000000000000..19dfb7abaa21
--- /dev/null
+++ b/include/asm-ppc/pgtable.h
@@ -0,0 +1,776 @@
+#ifdef __KERNEL__
+#ifndef _PPC_PGTABLE_H
+#define _PPC_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+#include <linux/config.h>
+
+#ifndef __ASSEMBLY__
+#include <linux/sched.h>
+#include <linux/threads.h>
+#include <asm/processor.h>              /* For TASK_SIZE */
+#include <asm/mmu.h>
+#include <asm/page.h>
+
+extern unsigned long va_to_phys(unsigned long address);
+extern pte_t *va_to_pte(unsigned long address);
+extern unsigned long ioremap_bot, ioremap_base;
+#endif /* __ASSEMBLY__ */
+
+/*
+ * The PowerPC MMU uses a hash table containing PTEs, together with
+ * a set of 16 segment registers (on 32-bit implementations), to define
+ * the virtual to physical address mapping.
+ *
+ * We use the hash table as an extended TLB, i.e. a cache of currently
+ * active mappings.  We maintain a two-level page table tree, much
+ * like that used by the i386, for the sake of the Linux memory
+ * management code.  Low-level assembler code in hashtable.S
+ * (procedure hash_page) is responsible for extracting ptes from the
+ * tree and putting them into the hash table when necessary, and
+ * updating the accessed and modified bits in the page table tree.
+ */
+
+/*
+ * The PowerPC MPC8xx uses a TLB with hardware assisted, software tablewalk.
+ * We also use the two level tables, but we can put the real bits in them
+ * needed for the TLB and tablewalk.  These definitions require Mx_CTR.PPM = 0,
+ * Mx_CTR.PPCS = 0, and MD_CTR.TWAM = 1.  The level 2 descriptor has
+ * additional page protection (when Mx_CTR.PPCS = 1) that allows TLB hit
+ * based upon user/super access.  The TLB does not have accessed nor write
+ * protect.  We assume that if the TLB get loaded with an entry it is
+ * accessed, and overload the changed bit for write protect.  We use
+ * two bits in the software pte that are supposed to be set to zero in
+ * the TLB entry (24 and 25) for these indicators.  Although the level 1
+ * descriptor contains the guarded and writethrough/copyback bits, we can
+ * set these at the page level since they get copied from the Mx_TWC
+ * register when the TLB entry is loaded.  We will use bit 27 for guard, since
+ * that is where it exists in the MD_TWC, and bit 26 for writethrough.
+ * These will get masked from the level 2 descriptor at TLB load time, and
+ * copied to the MD_TWC before it gets loaded.
+ * Large page sizes added.  We currently support two sizes, 4K and 8M.
+ * This also allows a TLB hander optimization because we can directly
+ * load the PMD into MD_TWC.  The 8M pages are only used for kernel
+ * mapping of well known areas.  The PMD (PGD) entries contain control
+ * flags in addition to the address, so care must be taken that the
+ * software no longer assumes these are only pointers.
+ */
+
+/*
+ * At present, all PowerPC 400-class processors share a similar TLB
+ * architecture. The instruction and data sides share a unified,
+ * 64-entry, fully-associative TLB which is maintained totally under
+ * software control. In addition, the instruction side has a
+ * hardware-managed, 4-entry, fully-associative TLB which serves as a
+ * first level to the shared TLB. These two TLBs are known as the UTLB
+ * and ITLB, respectively (see "mmu.h" for definitions).
+ */
+
+/*
+ * The normal case is that PTEs are 32-bits and we have a 1-page
+ * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages.  -- paulus
+ *
+ * For any >32-bit physical address platform, we can use the following
+ * two level page table layout where the pgdir is 8KB and the MS 13 bits
+ * are an index to the second level table.  The combined pgdir/pmd first
+ * level has 2048 entries and the second level has 512 64-bit PTE entries.
+ * -Matt
+ */
+/* PMD_SHIFT determines the size of the area mapped by the PTE pages */
+#define PMD_SHIFT       (PAGE_SHIFT + PTE_SHIFT)
+#define PMD_SIZE        (1UL << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a top-level page table entry can map */
+#define PGDIR_SHIFT     PMD_SHIFT
+#define PGDIR_SIZE      (1UL << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+/*
+ * entries per page directory level: our page-table tree is two-level, so
+ * we don't really have any PMD directory.
+ */
+#define PTRS_PER_PTE    (1 << PTE_SHIFT)
+#define PTRS_PER_PMD    1
+#define PTRS_PER_PGD    (1 << (32 - PGDIR_SHIFT))
+
+#define USER_PTRS_PER_PGD       (TASK_SIZE / PGDIR_SIZE)
+#define FIRST_USER_PGD_NR       0
+
+#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
+#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
+
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte "PTE_FMT".\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+        printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
+
+/*
+ * Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 64MB value just means that there will be a 64MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ *
+ * We no longer map larger than phys RAM with the BATs so we don't have
+ * to worry about the VMALLOC_OFFSET causing problems.  We do have to worry
+ * about clashes between our early calls to ioremap() that start growing down
+ * from ioremap_base being run into the VM area allocations (growing upwards
+ * from VMALLOC_START).  For this reason we have ioremap_bot to check when
+ * we actually run into our mappings setup in the early boot with the VM
+ * system.  This really does become a problem for machines with good amounts
+ * of RAM.  -- Cort
+ */
+#define VMALLOC_OFFSET (0x1000000) /* 16M */
+#ifdef CONFIG_44x
+#include <asm/ibm44x.h>
+#define VMALLOC_START (((_ALIGN((long)high_memory, PPC44x_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
+#else
+#define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
+#endif
+#define VMALLOC_END     ioremap_bot
+
+/*
+ * Bits in a linux-style PTE.  These match the bits in the
+ * (hardware-defined) PowerPC PTE as closely as possible.
+ */
+
+#if defined(CONFIG_40x)
+
+/* There are several potential gotchas here.  The 40x hardware TLBLO
+   field looks like this:
+
+   0  1  2  3  4  ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+   RPN.....................  0  0 EX WR ZSEL.......  W  I  M  G
+
+   Where possible we make the Linux PTE bits match up with this
+
+   - bits 20 and 21 must be cleared, because we use 4k pages (40x can
+     support down to 1k pages), this is done in the TLBMiss exception
+     handler.
+   - We use only zones 0 (for kernel pages) and 1 (for user pages)
+     of the 16 available.  Bit 24-26 of the TLB are cleared in the TLB
+     miss handler.  Bit 27 is PAGE_USER, thus selecting the correct
+     zone.
+   - PRESENT *must* be in the bottom two bits because swap cache
+     entries use the top 30 bits.  Because 40x doesn't support SMP
+     anyway, M is irrelevant so we borrow it for PAGE_PRESENT.  Bit 30
+     is cleared in the TLB miss handler before the TLB entry is loaded.
+   - All other bits of the PTE are loaded into TLBLO without
+     modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for
+     software PTE bits.  We actually use use bits 21, 24, 25, and
+     30 respectively for the software bits: ACCESSED, DIRTY, RW, and
+     PRESENT.
+*/
+
+/* Definitions for 40x embedded chips. */
+#define _PAGE_GUARDED   0x001   /* G: page is guarded from prefetch */
+#define _PAGE_FILE      0x001   /* when !present: nonlinear file mapping */
+#define _PAGE_PRESENT   0x002   /* software: PTE contains a translation */
+#define _PAGE_NO_CACHE  0x004   /* I: caching is inhibited */
+#define _PAGE_WRITETHRU 0x008   /* W: caching is write-through */
+#define _PAGE_USER      0x010   /* matches one of the zone permission bits */
+#define _PAGE_RW        0x040   /* software: Writes permitted */
+#define _PAGE_DIRTY     0x080   /* software: dirty page */
+#define _PAGE_HWWRITE   0x100   /* hardware: Dirty & RW, set in exception */
+#define _PAGE_HWEXEC    0x200   /* hardware: EX permission */
+#define _PAGE_ACCESSED  0x400   /* software: R: page referenced */
+
+#define _PMD_PRESENT    0x400   /* PMD points to page of PTEs */
+#define _PMD_BAD        0x802
+#define _PMD_SIZE       0x0e0   /* size field, != 0 for large-page PMD entry */
+#define _PMD_SIZE_4M    0x0c0
+#define _PMD_SIZE_16M   0x0e0
+#define PMD_PAGE_SIZE(pmdval)   (1024 << (((pmdval) & _PMD_SIZE) >> 4))
+
+#elif defined(CONFIG_44x)
+/*
+ * Definitions for PPC440
+ *
+ * Because of the 3 word TLB entries to support 36-bit addressing,
+ * the attribute are difficult to map in such a fashion that they
+ * are easily loaded during exception processing.  I decided to
+ * organize the entry so the ERPN is the only portion in the
+ * upper word of the PTE and the attribute bits below are packed
+ * in as sensibly as they can be in the area below a 4KB page size
+ * oriented RPN.  This at least makes it easy to load the RPN and
+ * ERPN fields in the TLB. -Matt
+ *
+ * Note that these bits preclude future use of a page size
+ * less than 4KB.
+ */
+#define _PAGE_PRESENT   0x00000001              /* S: PTE valid */
+#define _PAGE_RW        0x00000002              /* S: Write permission */
+#define _PAGE_DIRTY     0x00000004              /* S: Page dirty */
+#define _PAGE_ACCESSED  0x00000008              /* S: Page referenced */
+#define _PAGE_HWWRITE   0x00000010              /* H: Dirty & RW */
+#define _PAGE_HWEXEC    0x00000020              /* H: Execute permission */
+#define _PAGE_USER      0x00000040              /* S: User page */
+#define _PAGE_ENDIAN    0x00000080              /* H: E bit */
+#define _PAGE_GUARDED   0x00000100              /* H: G bit */
+#define _PAGE_COHERENT  0x00000200              /* H: M bit */
+#define _PAGE_FILE      0x00000400              /* S: nonlinear file mapping */
+#define _PAGE_NO_CACHE  0x00000400              /* H: I bit */
+#define _PAGE_WRITETHRU 0x00000800              /* H: W bit */
+
+/* TODO: Add large page lowmem mapping support */
+#define _PMD_PRESENT    0
+#define _PMD_PRESENT_MASK (PAGE_MASK)
+#define _PMD_BAD        (~PAGE_MASK)
+
+/* ERPN in a PTE never gets cleared, ignore it */
+#define _PTE_NONE_MASK  0xffffffff00000000ULL
+
+#elif defined(CONFIG_E500)
+
+/*
+   MMU Assist Register 3:
+
+   32 33 34 35 36  ... 50 51 52 53 54 55 56 57 58 59 60 61 62 63
+   RPN......................  0  0 U0 U1 U2 U3 UX SX UW SW UR SR
+
+   - PRESENT *must* be in the bottom three bits because swap cache
+     entries use the top 29 bits.
+
+   - FILE *must* be in the bottom three bits because swap cache
+     entries use the top 29 bits.
+*/
+
+/* Definitions for e500 core */
+#define _PAGE_PRESENT   0x001   /* S: PTE contains a translation */
+#define _PAGE_USER      0x002   /* S: User page (maps to UR) */
+#define _PAGE_FILE      0x002   /* S: when !present: nonlinear file mapping */
+#define _PAGE_ACCESSED  0x004   /* S: Page referenced */
+#define _PAGE_HWWRITE   0x008   /* H: Dirty & RW, set in exception */
+#define _PAGE_RW        0x010   /* S: Write permission */
+#define _PAGE_HWEXEC    0x020   /* H: UX permission */
+
+#define _PAGE_ENDIAN    0x040   /* H: E bit */
+#define _PAGE_GUARDED   0x080   /* H: G bit */
+#define _PAGE_COHERENT  0x100   /* H: M bit */
+#define _PAGE_NO_CACHE  0x200   /* H: I bit */
+#define _PAGE_WRITETHRU 0x400   /* H: W bit */
+#define _PAGE_DIRTY     0x800   /* S: Page dirty */
+
+#define _PMD_PRESENT    0
+#define _PMD_PRESENT_MASK (PAGE_MASK)
+#define _PMD_BAD        (~PAGE_MASK)
+
+#define NUM_TLBCAMS     (16)
+
+#elif defined(CONFIG_8xx)
+/* Definitions for 8xx embedded chips. */
+#define _PAGE_PRESENT   0x0001  /* Page is valid */
+#define _PAGE_FILE      0x0002  /* when !present: nonlinear file mapping */
+#define _PAGE_NO_CACHE  0x0002  /* I: cache inhibit */
+#define _PAGE_SHARED    0x0004  /* No ASID (context) compare */
+
+/* These five software bits must be masked out when the entry is loaded
+ * into the TLB.
+ */
+#define _PAGE_EXEC      0x0008  /* software: i-cache coherency required */
+#define _PAGE_GUARDED   0x0010  /* software: guarded access */
+#define _PAGE_DIRTY     0x0020  /* software: page changed */
+#define _PAGE_RW        0x0040  /* software: user write access allowed */
+#define _PAGE_ACCESSED  0x0080  /* software: page referenced */
+
+/* Setting any bits in the nibble with the follow two controls will
+ * require a TLB exception handler change.  It is assumed unused bits
+ * are always zero.
+ */
+#define _PAGE_HWWRITE   0x0100  /* h/w write enable: never set in Linux PTE */
+#define _PAGE_USER      0x0800  /* One of the PP bits, the other is USER&~RW */
+
+#define _PMD_PRESENT    0x0001
+#define _PMD_BAD        0x0ff0
+#define _PMD_PAGE_MASK  0x000c
+#define _PMD_PAGE_8M    0x000c
+
+/*
+ * The 8xx TLB miss handler allegedly sets _PAGE_ACCESSED in the PTE
+ * for an address even if _PAGE_PRESENT is not set, as a performance
+ * optimization.  This is a bug if you ever want to use swap unless
+ * _PAGE_ACCESSED is 2, which it isn't, or unless you have 8xx-specific
+ * definitions for __swp_entry etc. below, which would be gross.
+ *  -- paulus
+ */
+#define _PTE_NONE_MASK _PAGE_ACCESSED
+
+#else /* CONFIG_6xx */
+/* Definitions for 60x, 740/750, etc. */
+#define _PAGE_PRESENT   0x001   /* software: pte contains a translation */
+#define _PAGE_HASHPTE   0x002   /* hash_page has made an HPTE for this pte */
+#define _PAGE_FILE      0x004   /* when !present: nonlinear file mapping */
+#define _PAGE_USER      0x004   /* usermode access allowed */
+#define _PAGE_GUARDED   0x008   /* G: prohibit speculative access */
+#define _PAGE_COHERENT  0x010   /* M: enforce memory coherence (SMP systems) */
+#define _PAGE_NO_CACHE  0x020   /* I: cache inhibit */
+#define _PAGE_WRITETHRU 0x040   /* W: cache write-through */
+#define _PAGE_DIRTY     0x080   /* C: page changed */
+#define _PAGE_ACCESSED  0x100   /* R: page referenced */
+#define _PAGE_EXEC      0x200   /* software: i-cache coherency required */
+#define _PAGE_RW        0x400   /* software: user write access allowed */
+
+#define _PTE_NONE_MASK  _PAGE_HASHPTE
+
+#define _PMD_PRESENT    0
+#define _PMD_PRESENT_MASK (PAGE_MASK)
+#define _PMD_BAD        (~PAGE_MASK)
+#endif
+
+/*
+ * Some bits are only used on some cpu families...
+ */
+#ifndef _PAGE_HASHPTE
+#define _PAGE_HASHPTE   0
+#endif
+#ifndef _PTE_NONE_MASK
+#define _PTE_NONE_MASK 0
+#endif
+#ifndef _PAGE_SHARED
+#define _PAGE_SHARED    0
+#endif
+#ifndef _PAGE_HWWRITE
+#define _PAGE_HWWRITE   0
+#endif
+#ifndef _PAGE_HWEXEC
+#define _PAGE_HWEXEC    0
+#endif
+#ifndef _PAGE_EXEC
+#define _PAGE_EXEC      0
+#endif
+#ifndef _PMD_PRESENT_MASK
+#define _PMD_PRESENT_MASK       _PMD_PRESENT
+#endif
+#ifndef _PMD_SIZE
+#define _PMD_SIZE       0
+#define PMD_PAGE_SIZE(pmd)      bad_call_to_PMD_PAGE_SIZE()
+#endif
+
+#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+
+/*
+ * Note: the _PAGE_COHERENT bit automatically gets set in the hardware
+ * PTE if CONFIG_SMP is defined (hash_page does this); there is no need
+ * to have it in the Linux PTE, and in fact the bit could be reused for
+ * another purpose.  -- paulus.
+ */
+
+#ifdef CONFIG_44x
+#define _PAGE_BASE      (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_GUARDED)
+#else
+#define _PAGE_BASE      (_PAGE_PRESENT | _PAGE_ACCESSED)
+#endif
+#define _PAGE_WRENABLE  (_PAGE_RW | _PAGE_DIRTY | _PAGE_HWWRITE)
+#define _PAGE_KERNEL    (_PAGE_BASE | _PAGE_SHARED | _PAGE_WRENABLE)
+
+#ifdef CONFIG_PPC_STD_MMU
+/* On standard PPC MMU, no user access implies kernel read/write access,
+ * so to write-protect kernel memory we must turn on user access */
+#define _PAGE_KERNEL_RO (_PAGE_BASE | _PAGE_SHARED | _PAGE_USER)
+#else
+#define _PAGE_KERNEL_RO (_PAGE_BASE | _PAGE_SHARED)
+#endif
+
+#define _PAGE_IO        (_PAGE_KERNEL | _PAGE_NO_CACHE | _PAGE_GUARDED)
+#define _PAGE_RAM       (_PAGE_KERNEL | _PAGE_HWEXEC)
+
+#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH)
+/* We want the debuggers to be able to set breakpoints anywhere, so
+ * don't write protect the kernel text */
+#define _PAGE_RAM_TEXT  _PAGE_RAM
+#else
+#define _PAGE_RAM_TEXT  (_PAGE_KERNEL_RO | _PAGE_HWEXEC)
+#endif
+
+#define PAGE_NONE       __pgprot(_PAGE_BASE)
+#define PAGE_READONLY   __pgprot(_PAGE_BASE | _PAGE_USER)
+#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+#define PAGE_SHARED     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
+#define PAGE_SHARED_X   __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
+#define PAGE_COPY       __pgprot(_PAGE_BASE | _PAGE_USER)
+#define PAGE_COPY_X     __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+
+#define PAGE_KERNEL             __pgprot(_PAGE_RAM)
+#define PAGE_KERNEL_NOCACHE     __pgprot(_PAGE_IO)
+
+/*
+ * The PowerPC can only do execute protection on a segment (256MB) basis,
+ * not on a page basis.  So we consider execute permission the same as read.
+ * Also, write permissions imply read permissions.
+ * This is the closest we can get..
+ */
+#define __P000  PAGE_NONE
+#define __P001  PAGE_READONLY_X
+#define __P010  PAGE_COPY
+#define __P011  PAGE_COPY_X
+#define __P100  PAGE_READONLY
+#define __P101  PAGE_READONLY_X
+#define __P110  PAGE_COPY
+#define __P111  PAGE_COPY_X
+
+#define __S000  PAGE_NONE
+#define __S001  PAGE_READONLY_X
+#define __S010  PAGE_SHARED
+#define __S011  PAGE_SHARED_X
+#define __S100  PAGE_READONLY
+#define __S101  PAGE_READONLY_X
+#define __S110  PAGE_SHARED
+#define __S111  PAGE_SHARED_X
+
+#ifndef __ASSEMBLY__
+/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
+ * kernel without large page PMD support */
+extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
+
+/*
+ * Conversions between PTE values and page frame numbers.
+ */
+
+#define pte_pfn(x)              (pte_val(x) >> PAGE_SHIFT)
+#define pte_page(x)             pfn_to_page(pte_pfn(x))
+
+#define pfn_pte(pfn, prot)      __pte(((pte_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern unsigned long empty_zero_page[1024];
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+
+#endif /* __ASSEMBLY__ */
+
+#define pte_none(pte)           ((pte_val(pte) & ~_PTE_NONE_MASK) == 0)
+#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
+#define pte_clear(mm,addr,ptep) do { set_pte_at((mm), (addr), (ptep), __pte(0)); } while (0)
+
+#define pmd_none(pmd)           (!pmd_val(pmd))
+#define pmd_bad(pmd)            (pmd_val(pmd) & _PMD_BAD)
+#define pmd_present(pmd)        (pmd_val(pmd) & _PMD_PRESENT_MASK)
+#define pmd_clear(pmdp)         do { pmd_val(*(pmdp)) = 0; } while (0)
+
+#ifndef __ASSEMBLY__
+/*
+ * The "pgd_xxx()" functions here are trivial for a folded two-level
+ * setup: the pgd is never bad, and a pmd always exists (as it's folded
+ * into the pgd entry)
+ */
+static inline int pgd_none(pgd_t pgd)           { return 0; }
+static inline int pgd_bad(pgd_t pgd)            { return 0; }
+static inline int pgd_present(pgd_t pgd)        { return 1; }
+#define pgd_clear(xp)                           do { } while (0)
+
+#define pgd_page(pgd) \
+        ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+static inline int pte_read(pte_t pte)           { return pte_val(pte) & _PAGE_USER; }
+static inline int pte_write(pte_t pte)          { return pte_val(pte) & _PAGE_RW; }
+static inline int pte_exec(pte_t pte)           { return pte_val(pte) & _PAGE_EXEC; }
+static inline int pte_dirty(pte_t pte)          { return pte_val(pte) & _PAGE_DIRTY; }
+static inline int pte_young(pte_t pte)          { return pte_val(pte) & _PAGE_ACCESSED; }
+static inline int pte_file(pte_t pte)           { return pte_val(pte) & _PAGE_FILE; }
+
+static inline void pte_uncache(pte_t pte)       { pte_val(pte) |= _PAGE_NO_CACHE; }
+static inline void pte_cache(pte_t pte)         { pte_val(pte) &= ~_PAGE_NO_CACHE; }
+
+static inline pte_t pte_rdprotect(pte_t pte) {
+        pte_val(pte) &= ~_PAGE_USER; return pte; }
+static inline pte_t pte_wrprotect(pte_t pte) {
+        pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
+static inline pte_t pte_exprotect(pte_t pte) {
+        pte_val(pte) &= ~_PAGE_EXEC; return pte; }
+static inline pte_t pte_mkclean(pte_t pte) {
+        pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
+static inline pte_t pte_mkold(pte_t pte) {
+        pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
+
+static inline pte_t pte_mkread(pte_t pte) {
+        pte_val(pte) |= _PAGE_USER; return pte; }
+static inline pte_t pte_mkexec(pte_t pte) {
+        pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
+static inline pte_t pte_mkwrite(pte_t pte) {
+        pte_val(pte) |= _PAGE_RW; return pte; }
+static inline pte_t pte_mkdirty(pte_t pte) {
+        pte_val(pte) |= _PAGE_DIRTY; return pte; }
+static inline pte_t pte_mkyoung(pte_t pte) {
+        pte_val(pte) |= _PAGE_ACCESSED; return pte; }
+
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{
+        pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
+        return pte;
+}
+
+/*
+ * When flushing the tlb entry for a page, we also need to flush the hash
+ * table entry.  flush_hash_pages is assembler (for speed) in hashtable.S.
+ */
+extern int flush_hash_pages(unsigned context, unsigned long va,
+                            unsigned long pmdval, int count);
+
+/* Add an HPTE to the hash table */
+extern void add_hash_page(unsigned context, unsigned long va,
+                          unsigned long pmdval);
+
+/*
+ * Atomic PTE updates.
+ *
+ * pte_update clears and sets bit atomically, and returns
+ * the old pte value.
+ * The ((unsigned long)(p+1) - 4) hack is to get to the least-significant
+ * 32 bits of the PTE regardless of whether PTEs are 32 or 64 bits.
+ */
+static inline unsigned long pte_update(pte_t *p, unsigned long clr,
+                                       unsigned long set)
+{
+        unsigned long old, tmp;
+
+        __asm__ __volatile__("\
+1:      lwarx   %0,0,%3\n\
+        andc    %1,%0,%4\n\
+        or      %1,%1,%5\n"
+        PPC405_ERR77(0,%3)
+"       stwcx.  %1,0,%3\n\
+        bne-    1b"
+        : "=&r" (old), "=&r" (tmp), "=m" (*p)
+        : "r" ((unsigned long)(p+1) - 4), "r" (clr), "r" (set), "m" (*p)
+        : "cc" );
+        return old;
+}
+
+/*
+ * set_pte stores a linux PTE into the linux page table.
+ * On machines which use an MMU hash table we avoid changing the
+ * _PAGE_HASHPTE bit.
+ */
+static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
+                              pte_t *ptep, pte_t pte)
+{
+#if _PAGE_HASHPTE != 0
+        pte_update(ptep, ~_PAGE_HASHPTE, pte_val(pte) & ~_PAGE_HASHPTE);
+#else
+        *ptep = pte;
+#endif
+}
+
+/*
+ * 2.6 calles this without flushing the TLB entry, this is wrong
+ * for our hash-based implementation, we fix that up here
+ */
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep)
+{
+        unsigned long old;
+        old = pte_update(ptep, _PAGE_ACCESSED, 0);
+#if _PAGE_HASHPTE != 0
+        if (old & _PAGE_HASHPTE) {
+                unsigned long ptephys = __pa(ptep) & PAGE_MASK;
+                flush_hash_pages(context, addr, ptephys, 1);
+        }
+#endif
+        return (old & _PAGE_ACCESSED) != 0;
+}
+#define ptep_test_and_clear_young(__vma, __addr, __ptep) \
+        __ptep_test_and_clear_young((__vma)->vm_mm->context, __addr, __ptep)
+
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
+static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma,
+                                            unsigned long addr, pte_t *ptep)
+{
+        return (pte_update(ptep, (_PAGE_DIRTY | _PAGE_HWWRITE), 0) & _PAGE_DIRTY) != 0;
+}
+
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
+                                       pte_t *ptep)
+{
+        return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0));
+}
+
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
+                                      pte_t *ptep)
+{
+        pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0);
+}
+
+#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
+{
+        unsigned long bits = pte_val(entry) &
+                (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW);
+        pte_update(ptep, 0, bits);
+}
+
+#define  ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
+        do {                                                               \
+                __ptep_set_access_flags(__ptep, __entry, __dirty);         \
+                flush_tlb_page_nohash(__vma, __address);                   \
+        } while(0)
+
+/*
+ * Macro to mark a page protection value as "uncacheable".
+ */
+#define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_NO_CACHE | _PAGE_GUARDED))
+
+struct file;
+extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
+                                     unsigned long size, pgprot_t vma_prot);
+#define __HAVE_PHYS_MEM_ACCESS_PROT
+
+#define __HAVE_ARCH_PTE_SAME
+#define pte_same(A,B)   (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0)
+
+/*
+ * Note that on Book E processors, the pmd contains the kernel virtual
+ * (lowmem) address of the pte page.  The physical address is less useful
+ * because everything runs with translation enabled (even the TLB miss
+ * handler).  On everything else the pmd contains the physical address
+ * of the pte page.  -- paulus
+ */
+#ifndef CONFIG_BOOKE
+#define pmd_page_kernel(pmd)    \
+        ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
+#define pmd_page(pmd)           \
+        (mem_map + (pmd_val(pmd) >> PAGE_SHIFT))
+#else
+#define pmd_page_kernel(pmd)    \
+        ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
+#define pmd_page(pmd)           \
+        (mem_map + (__pa(pmd_val(pmd)) >> PAGE_SHIFT))
+#endif
+
+/* to find an entry in a kernel page-table-directory */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/* to find an entry in a page-table-directory */
+#define pgd_index(address)       ((address) >> PGDIR_SHIFT)
+#define pgd_offset(mm, address)  ((mm)->pgd + pgd_index(address))
+
+/* Find an entry in the second-level page table.. */
+static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
+{
+        return (pmd_t *) dir;
+}
+
+/* Find an entry in the third-level page table.. */
+#define pte_index(address)              \
+        (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, addr)    \
+        ((pte_t *) pmd_page_kernel(*(dir)) + pte_index(addr))
+#define pte_offset_map(dir, addr)               \
+        ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE0) + pte_index(addr))
+#define pte_offset_map_nested(dir, addr)        \
+        ((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE1) + pte_index(addr))
+
+#define pte_unmap(pte)          kunmap_atomic(pte, KM_PTE0)
+#define pte_unmap_nested(pte)   kunmap_atomic(pte, KM_PTE1)
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+extern void paging_init(void);
+
+/*
+ * Encode and decode a swap entry.
+ * Note that the bits we use in a PTE for representing a swap entry
+ * must not include the _PAGE_PRESENT bit, the _PAGE_FILE bit, or the
+ *_PAGE_HASHPTE bit (if used).  -- paulus
+ */
+#define __swp_type(entry)               ((entry).val & 0x1f)
+#define __swp_offset(entry)             ((entry).val >> 5)
+#define __swp_entry(type, offset)       ((swp_entry_t) { (type) | ((offset) << 5) })
+#define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) >> 3 })
+#define __swp_entry_to_pte(x)           ((pte_t) { (x).val << 3 })
+
+/* Encode and decode a nonlinear file mapping entry */
+#define PTE_FILE_MAX_BITS       29
+#define pte_to_pgoff(pte)       (pte_val(pte) >> 3)
+#define pgoff_to_pte(off)       ((pte_t) { ((off) << 3) | _PAGE_FILE })
+
+/* CONFIG_APUS */
+/* For virtual address to physical address conversion */
+extern void cache_clear(__u32 addr, int length);
+extern void cache_push(__u32 addr, int length);
+extern int mm_end_of_chunk (unsigned long addr, int len);
+extern unsigned long iopa(unsigned long addr);
+extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
+
+/* Values for nocacheflag and cmode */
+/* These are not used by the APUS kernel_map, but prevents
+   compilation errors. */
+#define KERNELMAP_FULL_CACHING          0
+#define KERNELMAP_NOCACHE_SER           1
+#define KERNELMAP_NOCACHE_NONSER        2
+#define KERNELMAP_NO_COPYBACK           3
+
+/*
+ * Map some physical address range into the kernel address space.
+ */
+extern unsigned long kernel_map(unsigned long paddr, unsigned long size,
+                                int nocacheflag, unsigned long *memavailp );
+
+/*
+ * Set cache mode of (kernel space) address range.
+ */
+extern void kernel_set_cachemode (unsigned long address, unsigned long size,
+                                 unsigned int cmode);
+
+/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
+#define kern_addr_valid(addr)   (1)
+
+#ifdef CONFIG_PHYS_64BIT
+extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
+                        unsigned long paddr, unsigned long size, pgprot_t prot);
+static inline int io_remap_page_range(struct vm_area_struct *vma,
+                                        unsigned long vaddr,
+                                        unsigned long paddr,
+                                        unsigned long size,
+                                        pgprot_t prot)
+{
+        phys_addr_t paddr64 = fixup_bigphys_addr(paddr, size);
+        return remap_pfn_range(vma, vaddr, paddr64 >> PAGE_SHIFT, size, prot);
+}
+
+static inline int io_remap_pfn_range(struct vm_area_struct *vma,
+                                        unsigned long vaddr,
+                                        unsigned long pfn,
+                                        unsigned long size,
+                                        pgprot_t prot)
+{
+        phys_addr_t paddr64 = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
+        return remap_pfn_range(vma, vaddr, paddr64 >> PAGE_SHIFT, size, prot);
+}
+#else
+#define io_remap_page_range(vma, vaddr, paddr, size, prot)              \
+                remap_pfn_range(vma, vaddr, (paddr) >> PAGE_SHIFT, size, prot)
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+#endif
+
+#define MK_IOSPACE_PFN(space, pfn)      (pfn)
+#define GET_IOSPACE(pfn)                0
+#define GET_PFN(pfn)                    (pfn)
+
+/*
+ * No page table caches to initialise
+ */
+#define pgtable_cache_init()    do { } while (0)
+
+extern int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep);
+
+#include <asm-generic/pgtable.h>
+
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _PPC_PGTABLE_H */
+#endif /* __KERNEL__ */