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, 602 insertions, 0 deletions

diff --git a/include/asm-ppc64/pgtable.h b/include/asm-ppc64/pgtable.h
new file mode 100644
index 0000000000000..4c4824653e809
--- /dev/null
+++ b/include/asm-ppc64/pgtable.h
@@ -0,0 +1,602 @@
+#ifndef _PPC64_PGTABLE_H
+#define _PPC64_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+/*
+ * This file contains the functions and defines necessary to modify and use
+ * the ppc64 hashed page table.
+ */
+
+#ifndef __ASSEMBLY__
+#include <linux/config.h>
+#include <linux/stddef.h>
+#include <asm/processor.h>		/* For TASK_SIZE */
+#include <asm/mmu.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+#endif /* __ASSEMBLY__ */
+
+/* PMD_SHIFT determines what a second-level page table entry can map */
+#define PMD_SHIFT	(PAGE_SHIFT + PAGE_SHIFT - 3)
+#define PMD_SIZE	(1UL << PMD_SHIFT)
+#define PMD_MASK	(~(PMD_SIZE-1))
+
+/* PGDIR_SHIFT determines what a third-level page table entry can map */
+#define PGDIR_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT - 3) + (PAGE_SHIFT - 2))
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+
+/*
+ * Entries per page directory level.  The PTE level must use a 64b record
+ * for each page table entry.  The PMD and PGD level use a 32b record for 
+ * each entry by assuming that each entry is page aligned.
+ */
+#define PTE_INDEX_SIZE  9
+#define PMD_INDEX_SIZE  10
+#define PGD_INDEX_SIZE  10
+
+#define PTRS_PER_PTE	(1 << PTE_INDEX_SIZE)
+#define PTRS_PER_PMD	(1 << PMD_INDEX_SIZE)
+#define PTRS_PER_PGD	(1 << PGD_INDEX_SIZE)
+
+#define USER_PTRS_PER_PGD	(1024)
+#define FIRST_USER_PGD_NR	0
+
+#define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
+                    PGD_INDEX_SIZE + PAGE_SHIFT) 
+
+/*
+ * Size of EA range mapped by our pagetables.
+ */
+#define PGTABLE_EA_BITS	41
+#define PGTABLE_EA_MASK	((1UL<<PGTABLE_EA_BITS)-1)
+
+/*
+ * Define the address range of the vmalloc VM area.
+ */
+#define VMALLOC_START (0xD000000000000000ul)
+#define VMALLOC_END   (VMALLOC_START + PGTABLE_EA_MASK)
+
+/*
+ * Define the address range of the imalloc VM area.
+ * (used for ioremap)
+ */
+#define IMALLOC_START     (ioremap_bot)
+#define IMALLOC_VMADDR(x) ((unsigned long)(x))
+#define PHBS_IO_BASE  	  (0xE000000000000000ul)	/* Reserve 2 gigs for PHBs */
+#define IMALLOC_BASE      (0xE000000080000000ul)  
+#define IMALLOC_END       (IMALLOC_BASE + PGTABLE_EA_MASK)
+
+/*
+ * Define the user address range
+ */
+#define USER_START (0UL)
+#define USER_END   (USER_START + PGTABLE_EA_MASK)
+
+
+/*
+ * Bits in a linux-style PTE.  These match the bits in the
+ * (hardware-defined) PowerPC PTE as closely as possible.
+ */
+#define _PAGE_PRESENT	0x0001 /* software: pte contains a translation */
+#define _PAGE_USER	0x0002 /* matches one of the PP bits */
+#define _PAGE_FILE	0x0002 /* (!present only) software: pte holds file offset */
+#define _PAGE_EXEC	0x0004 /* No execute on POWER4 and newer (we invert) */
+#define _PAGE_GUARDED	0x0008
+#define _PAGE_COHERENT	0x0010 /* M: enforce memory coherence (SMP systems) */
+#define _PAGE_NO_CACHE	0x0020 /* I: cache inhibit */
+#define _PAGE_WRITETHRU	0x0040 /* W: cache write-through */
+#define _PAGE_DIRTY	0x0080 /* C: page changed */
+#define _PAGE_ACCESSED	0x0100 /* R: page referenced */
+#define _PAGE_RW	0x0200 /* software: user write access allowed */
+#define _PAGE_HASHPTE	0x0400 /* software: pte has an associated HPTE */
+#define _PAGE_BUSY	0x0800 /* software: PTE & hash are busy */ 
+#define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */
+#define _PAGE_GROUP_IX  0x7000 /* software: HPTE index within group */
+#define _PAGE_HUGE	0x10000 /* 16MB page */
+/* Bits 0x7000 identify the index within an HPT Group */
+#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_SECONDARY | _PAGE_GROUP_IX)
+/* PAGE_MASK gives the right answer below, but only by accident */
+/* It should be preserving the high 48 bits and then specifically */
+/* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */
+#define _PAGE_CHG_MASK	(PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_HPTEFLAGS)
+
+#define _PAGE_BASE	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_COHERENT)
+
+#define _PAGE_WRENABLE	(_PAGE_RW | _PAGE_DIRTY)
+
+/* __pgprot defined in asm-ppc64/page.h */
+#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
+
+#define PAGE_SHARED	__pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER)
+#define PAGE_SHARED_X	__pgprot(_PAGE_BASE | _PAGE_RW | _PAGE_USER | _PAGE_EXEC)
+#define PAGE_COPY	__pgprot(_PAGE_BASE | _PAGE_USER)
+#define PAGE_COPY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+#define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_USER)
+#define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
+#define PAGE_KERNEL	__pgprot(_PAGE_BASE | _PAGE_WRENABLE)
+#define PAGE_KERNEL_CI	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | \
+			       _PAGE_WRENABLE | _PAGE_NO_CACHE | _PAGE_GUARDED)
+#define PAGE_KERNEL_EXEC __pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_EXEC)
+
+#define PAGE_AGP	__pgprot(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_NO_CACHE)
+#define HAVE_PAGE_AGP
+
+/*
+ * This bit in a hardware PTE indicates that the page is *not* executable.
+ */
+#define HW_NO_EXEC	_PAGE_EXEC
+
+/*
+ * POWER4 and newer have per page execute protection, older chips can only
+ * do this on a segment (256MB) basis.
+ *
+ * Also, write permissions imply read permissions.
+ * This is the closest we can get..
+ *
+ * Note due to the way vm flags are laid out, the bits are XWR
+ */
+#define __P000	PAGE_NONE
+#define __P001	PAGE_READONLY
+#define __P010	PAGE_COPY
+#define __P011	PAGE_COPY
+#define __P100	PAGE_READONLY_X
+#define __P101	PAGE_READONLY_X
+#define __P110	PAGE_COPY_X
+#define __P111	PAGE_COPY_X
+
+#define __S000	PAGE_NONE
+#define __S001	PAGE_READONLY
+#define __S010	PAGE_SHARED
+#define __S011	PAGE_SHARED
+#define __S100	PAGE_READONLY_X
+#define __S101	PAGE_READONLY_X
+#define __S110	PAGE_SHARED_X
+#define __S111	PAGE_SHARED_X
+
+#ifndef __ASSEMBLY__
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+#endif /* __ASSEMBLY__ */
+
+/* shift to put page number into pte */
+#define PTE_SHIFT (17)
+
+/* We allow 2^41 bytes of real memory, so we need 29 bits in the PMD
+ * to give the PTE page number.  The bottom two bits are for flags. */
+#define PMD_TO_PTEPAGE_SHIFT (2)
+
+#ifdef CONFIG_HUGETLB_PAGE
+
+#ifndef __ASSEMBLY__
+int hash_huge_page(struct mm_struct *mm, unsigned long access,
+		   unsigned long ea, unsigned long vsid, int local);
+
+void hugetlb_mm_free_pgd(struct mm_struct *mm);
+#endif /* __ASSEMBLY__ */
+
+#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+#else
+
+#define hash_huge_page(mm,a,ea,vsid,local)	-1
+#define hugetlb_mm_free_pgd(mm)			do {} while (0)
+
+#endif
+
+#ifndef __ASSEMBLY__
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ *
+ * mk_pte takes a (struct page *) as input
+ */
+#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
+
+#define pfn_pte(pfn,pgprot)						\
+({									\
+	pte_t pte;							\
+	pte_val(pte) = ((unsigned long)(pfn) << PTE_SHIFT) |   		\
+                        pgprot_val(pgprot);				\
+	pte;								\
+})
+
+#define pte_modify(_pte, newprot) \
+  (__pte((pte_val(_pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)))
+
+#define pte_none(pte)		((pte_val(pte) & ~_PAGE_HPTEFLAGS) == 0)
+#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)
+
+/* pte_clear moved to later in this file */
+
+#define pte_pfn(x)		((unsigned long)((pte_val(x) >> PTE_SHIFT)))
+#define pte_page(x)		pfn_to_page(pte_pfn(x))
+
+#define pmd_set(pmdp, ptep) 	\
+	(pmd_val(*(pmdp)) = (__ba_to_bpn(ptep) << PMD_TO_PTEPAGE_SHIFT))
+#define pmd_none(pmd)		(!pmd_val(pmd))
+#define	pmd_bad(pmd)		(pmd_val(pmd) == 0)
+#define	pmd_present(pmd)	(pmd_val(pmd) != 0)
+#define	pmd_clear(pmdp)		(pmd_val(*(pmdp)) = 0)
+#define pmd_page_kernel(pmd)	\
+	(__bpn_to_ba(pmd_val(pmd) >> PMD_TO_PTEPAGE_SHIFT))
+#define pmd_page(pmd)		virt_to_page(pmd_page_kernel(pmd))
+#define pgd_set(pgdp, pmdp)	(pgd_val(*(pgdp)) = (__ba_to_bpn(pmdp)))
+#define pgd_none(pgd)		(!pgd_val(pgd))
+#define pgd_bad(pgd)		((pgd_val(pgd)) == 0)
+#define pgd_present(pgd)	(pgd_val(pgd) != 0UL)
+#define pgd_clear(pgdp)		(pgd_val(*(pgdp)) = 0UL)
+#define pgd_page(pgd)		(__bpn_to_ba(pgd_val(pgd))) 
+
+/* 
+ * Find an entry in a page-table-directory.  We combine the address region 
+ * (the high order N bits) and the pgd portion of the address.
+ */
+/* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */
+#define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x7ff)
+
+#define pgd_offset(mm, address)	 ((mm)->pgd + pgd_index(address))
+
+/* Find an entry in the second-level page table.. */
+#define pmd_offset(dir,addr) \
+  ((pmd_t *) pgd_page(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
+
+/* Find an entry in the third-level page table.. */
+#define pte_offset_kernel(dir,addr) \
+  ((pte_t *) pmd_page_kernel(*(dir)) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
+
+#define pte_offset_map(dir,addr)	pte_offset_kernel((dir), (addr))
+#define pte_offset_map_nested(dir,addr)	pte_offset_kernel((dir), (addr))
+#define pte_unmap(pte)			do { } while(0)
+#define pte_unmap_nested(pte)		do { } while(0)
+
+/* to find an entry in a kernel page-table-directory */
+/* This now only contains the vmalloc pages */
+#define pgd_offset_k(address) pgd_offset(&init_mm, address)
+
+/* to find an entry in the ioremap page-table-directory */
+#define pgd_offset_i(address) (ioremap_pgd + pgd_index(address))
+
+#define pages_to_mb(x)		((x) >> (20-PAGE_SHIFT))
+
+/*
+ * 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 int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE;}
+
+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_exprotect(pte_t pte) {
+	pte_val(pte) &= ~_PAGE_EXEC; return pte; }
+static inline pte_t pte_wrprotect(pte_t pte) {
+	pte_val(pte) &= ~(_PAGE_RW); return pte; }
+static inline pte_t pte_mkclean(pte_t pte) {
+	pte_val(pte) &= ~(_PAGE_DIRTY); 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_mkhuge(pte_t pte) {
+	pte_val(pte) |= _PAGE_HUGE; return pte; }
+
+/* Atomic PTE updates */
+static inline unsigned long pte_update(pte_t *p, unsigned long clr)
+{
+	unsigned long old, tmp;
+
+	__asm__ __volatile__(
+	"1:	ldarx	%0,0,%3		# pte_update\n\
+	andi.	%1,%0,%6\n\
+	bne-	1b \n\
+	andc	%1,%0,%4 \n\
+	stdcx.	%1,0,%3 \n\
+	bne-	1b"
+	: "=&r" (old), "=&r" (tmp), "=m" (*p)
+	: "r" (p), "r" (clr), "m" (*p), "i" (_PAGE_BUSY)
+	: "cc" );
+	return old;
+}
+
+/* PTE updating functions, this function puts the PTE in the
+ * batch, doesn't actually triggers the hash flush immediately,
+ * you need to call flush_tlb_pending() to do that.
+ */
+extern void hpte_update(struct mm_struct *mm, unsigned long addr, unsigned long pte,
+			int wrprot);
+
+static inline int __ptep_test_and_clear_young(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	unsigned long old;
+
+       	if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0)
+		return 0;
+	old = pte_update(ptep, _PAGE_ACCESSED);
+	if (old & _PAGE_HASHPTE) {
+		hpte_update(mm, addr, old, 0);
+		flush_tlb_pending();
+	}
+	return (old & _PAGE_ACCESSED) != 0;
+}
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+#define ptep_test_and_clear_young(__vma, __addr, __ptep)		   \
+({									   \
+	int __r;							   \
+	__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
+	__r;								   \
+})
+
+/*
+ * On RW/DIRTY bit transitions we can avoid flushing the hpte. For the
+ * moment we always flush but we need to fix hpte_update and test if the
+ * optimisation is worth it.
+ */
+static inline int __ptep_test_and_clear_dirty(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	unsigned long old;
+
+       	if ((pte_val(*ptep) & _PAGE_DIRTY) == 0)
+		return 0;
+	old = pte_update(ptep, _PAGE_DIRTY);
+	if (old & _PAGE_HASHPTE)
+		hpte_update(mm, addr, old, 0);
+	return (old & _PAGE_DIRTY) != 0;
+}
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
+#define ptep_test_and_clear_dirty(__vma, __addr, __ptep)		   \
+({									   \
+	int __r;							   \
+	__r = __ptep_test_and_clear_dirty((__vma)->vm_mm, __addr, __ptep); \
+	__r;								   \
+})
+
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	unsigned long old;
+
+       	if ((pte_val(*ptep) & _PAGE_RW) == 0)
+       		return;
+	old = pte_update(ptep, _PAGE_RW);
+	if (old & _PAGE_HASHPTE)
+		hpte_update(mm, addr, old, 0);
+}
+
+/*
+ * We currently remove entries from the hashtable regardless of whether
+ * the entry was young or dirty. The generic routines only flush if the
+ * entry was young or dirty which is not good enough.
+ *
+ * We should be more intelligent about this but for the moment we override
+ * these functions and force a tlb flush unconditionally
+ */
+#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
+#define ptep_clear_flush_young(__vma, __address, __ptep)		\
+({									\
+	int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
+						  __ptep);		\
+	__young;							\
+})
+
+#define __HAVE_ARCH_PTEP_CLEAR_DIRTY_FLUSH
+#define ptep_clear_flush_dirty(__vma, __address, __ptep)		\
+({									\
+	int __dirty = __ptep_test_and_clear_dirty((__vma)->vm_mm, __address, \
+						  __ptep); 		\
+	flush_tlb_page(__vma, __address);				\
+	__dirty;							\
+})
+
+#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)
+{
+	unsigned long old = pte_update(ptep, ~0UL);
+
+	if (old & _PAGE_HASHPTE)
+		hpte_update(mm, addr, old, 0);
+	return __pte(old);
+}
+
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t * ptep)
+{
+	unsigned long old = pte_update(ptep, ~0UL);
+
+	if (old & _PAGE_HASHPTE)
+		hpte_update(mm, addr, old, 0);
+}
+
+/*
+ * set_pte stores a linux PTE into the linux page table.
+ */
+static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
+			      pte_t *ptep, pte_t pte)
+{
+	if (pte_present(*ptep)) {
+		pte_clear(mm, addr, ptep);
+		flush_tlb_pending();
+	}
+	*ptep = __pte(pte_val(pte)) & ~_PAGE_HPTEFLAGS;
+}
+
+/* Set the dirty and/or accessed bits atomically in a linux PTE, this
+ * function doesn't need to flush the hash entry
+ */
+#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 | _PAGE_EXEC);
+	unsigned long old, tmp;
+
+	__asm__ __volatile__(
+	"1:	ldarx	%0,0,%4\n\
+		andi.	%1,%0,%6\n\
+		bne-	1b \n\
+		or	%0,%3,%0\n\
+		stdcx.	%0,0,%4\n\
+		bne-	1b"
+	:"=&r" (old), "=&r" (tmp), "=m" (*ptep)
+	:"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY)
+	:"cc");
+}
+#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_HPTEFLAGS) == 0)
+
+extern unsigned long ioremap_bot, ioremap_base;
+
+#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 %016lx.\n", __FILE__, __LINE__, pte_val(e))
+#define pmd_ERROR(e) \
+	printk("%s:%d: bad pmd %08x.\n", __FILE__, __LINE__, pmd_val(e))
+#define pgd_ERROR(e) \
+	printk("%s:%d: bad pgd %08x.\n", __FILE__, __LINE__, pgd_val(e))
+
+extern pgd_t swapper_pg_dir[1024];
+extern pgd_t ioremap_dir[1024];
+
+extern void paging_init(void);
+
+struct mmu_gather;
+void hugetlb_free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *prev,
+			   unsigned long start, unsigned long end);
+
+/*
+ * This gets called at the end of handling a page fault, when
+ * the kernel has put a new PTE into the page table for the process.
+ * We use it to put a corresponding HPTE into the hash table
+ * ahead of time, instead of waiting for the inevitable extra
+ * hash-table miss exception.
+ */
+struct vm_area_struct;
+extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
+
+/* Encode and de-code a swap entry */
+#define __swp_type(entry)	(((entry).val >> 1) & 0x3f)
+#define __swp_offset(entry)	((entry).val >> 8)
+#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
+#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) >> PTE_SHIFT })
+#define __swp_entry_to_pte(x)	((pte_t) { (x).val << PTE_SHIFT })
+#define pte_to_pgoff(pte)	(pte_val(pte) >> PTE_SHIFT)
+#define pgoff_to_pte(off)	((pte_t) {((off) << PTE_SHIFT)|_PAGE_FILE})
+#define PTE_FILE_MAX_BITS	(BITS_PER_LONG - PTE_SHIFT)
+
+/*
+ * kern_addr_valid is intended to indicate whether an address is a valid
+ * kernel address.  Most 32-bit archs define it as always true (like this)
+ * but most 64-bit archs actually perform a test.  What should we do here?
+ * The only use is in fs/ncpfs/dir.c
+ */
+#define kern_addr_valid(addr)	(1)
+
+#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)
+
+#define MK_IOSPACE_PFN(space, pfn)	(pfn)
+#define GET_IOSPACE(pfn)		0
+#define GET_PFN(pfn)			(pfn)
+
+void pgtable_cache_init(void);
+
+extern void hpte_init_native(void);
+extern void hpte_init_lpar(void);
+extern void hpte_init_iSeries(void);
+
+/* imalloc region types */
+#define IM_REGION_UNUSED	0x1
+#define IM_REGION_SUBSET	0x2
+#define IM_REGION_EXISTS	0x4
+#define IM_REGION_OVERLAP	0x8
+#define IM_REGION_SUPERSET	0x10
+
+extern struct vm_struct * im_get_free_area(unsigned long size);
+extern struct vm_struct * im_get_area(unsigned long v_addr, unsigned long size,
+			int region_type);
+unsigned long im_free(void *addr);
+
+extern long pSeries_lpar_hpte_insert(unsigned long hpte_group,
+				     unsigned long va, unsigned long prpn,
+				     int secondary, unsigned long hpteflags,
+				     int bolted, int large);
+
+extern long native_hpte_insert(unsigned long hpte_group, unsigned long va,
+			       unsigned long prpn, int secondary,
+			       unsigned long hpteflags, int bolted, int large);
+
+/*
+ * find_linux_pte returns the address of a linux pte for a given 
+ * effective address and directory.  If not found, it returns zero.
+ */
+static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea)
+{
+	pgd_t *pg;
+	pmd_t *pm;
+	pte_t *pt = NULL;
+	pte_t pte;
+
+	pg = pgdir + pgd_index(ea);
+	if (!pgd_none(*pg)) {
+
+		pm = pmd_offset(pg, ea);
+		if (pmd_present(*pm)) { 
+			pt = pte_offset_kernel(pm, ea);
+			pte = *pt;
+			if (!pte_present(pte))
+				pt = NULL;
+		}
+	}
+
+	return pt;
+}
+
+#include <asm-generic/pgtable.h>
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* _PPC64_PGTABLE_H */