1 files changed, 432 insertions, 0 deletions

diff --git a/include/asm-x86/pgtable_64.h b/include/asm-x86/pgtable_64.h
new file mode 100644
index 000000000000..57dd6b3107ea
--- /dev/null
+++ b/include/asm-x86/pgtable_64.h
@@ -0,0 +1,432 @@
+#ifndef _X86_64_PGTABLE_H
+#define _X86_64_PGTABLE_H
+
+#include <linux/const.h>
+#ifndef __ASSEMBLY__
+
+/*
+ * This file contains the functions and defines necessary to modify and use
+ * the x86-64 page table tree.
+ */
+#include <asm/processor.h>
+#include <asm/bitops.h>
+#include <linux/threads.h>
+#include <asm/pda.h>
+
+extern pud_t level3_kernel_pgt[512];
+extern pud_t level3_ident_pgt[512];
+extern pmd_t level2_kernel_pgt[512];
+extern pgd_t init_level4_pgt[];
+extern unsigned long __supported_pte_mask;
+
+#define swapper_pg_dir init_level4_pgt
+
+extern void paging_init(void);
+extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
+
+/*
+ * 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__ */
+
+/*
+ * PGDIR_SHIFT determines what a top-level page table entry can map
+ */
+#define PGDIR_SHIFT     39
+#define PTRS_PER_PGD    512
+
+/*
+ * 3rd level page
+ */
+#define PUD_SHIFT       30
+#define PTRS_PER_PUD    512
+
+/*
+ * PMD_SHIFT determines the size of the area a middle-level
+ * page table can map
+ */
+#define PMD_SHIFT       21
+#define PTRS_PER_PMD    512
+
+/*
+ * entries per page directory level
+ */
+#define PTRS_PER_PTE    512
+
+#ifndef __ASSEMBLY__
+
+#define pte_ERROR(e) \
+        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
+#define pmd_ERROR(e) \
+        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
+#define pud_ERROR(e) \
+        printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
+#define pgd_ERROR(e) \
+        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
+
+#define pgd_none(x)     (!pgd_val(x))
+#define pud_none(x)     (!pud_val(x))
+
+static inline void set_pte(pte_t *dst, pte_t val)
+{
+        pte_val(*dst) = pte_val(val);
+} 
+#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+
+static inline void set_pmd(pmd_t *dst, pmd_t val)
+{
+        pmd_val(*dst) = pmd_val(val); 
+} 
+
+static inline void set_pud(pud_t *dst, pud_t val)
+{
+        pud_val(*dst) = pud_val(val);
+}
+
+static inline void pud_clear (pud_t *pud)
+{
+        set_pud(pud, __pud(0));
+}
+
+static inline void set_pgd(pgd_t *dst, pgd_t val)
+{
+        pgd_val(*dst) = pgd_val(val); 
+} 
+
+static inline void pgd_clear (pgd_t * pgd)
+{
+        set_pgd(pgd, __pgd(0));
+}
+
+#define ptep_get_and_clear(mm,addr,xp)  __pte(xchg(&(xp)->pte, 0))
+
+struct mm_struct;
+
+static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
+{
+        pte_t pte;
+        if (full) {
+                pte = *ptep;
+                *ptep = __pte(0);
+        } else {
+                pte = ptep_get_and_clear(mm, addr, ptep);
+        }
+        return pte;
+}
+
+#define pte_same(a, b)          ((a).pte == (b).pte)
+
+#define pte_pgprot(a)   (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
+
+#endif /* !__ASSEMBLY__ */
+
+#define PMD_SIZE        (_AC(1,UL) << PMD_SHIFT)
+#define PMD_MASK        (~(PMD_SIZE-1))
+#define PUD_SIZE        (_AC(1,UL) << PUD_SHIFT)
+#define PUD_MASK        (~(PUD_SIZE-1))
+#define PGDIR_SIZE      (_AC(1,UL) << PGDIR_SHIFT)
+#define PGDIR_MASK      (~(PGDIR_SIZE-1))
+
+#define USER_PTRS_PER_PGD       ((TASK_SIZE-1)/PGDIR_SIZE+1)
+#define FIRST_USER_ADDRESS      0
+
+#define MAXMEM           _AC(0x3fffffffffff, UL)
+#define VMALLOC_START    _AC(0xffffc20000000000, UL)
+#define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
+#define MODULES_VADDR    _AC(0xffffffff88000000, UL)
+#define MODULES_END      _AC(0xfffffffffff00000, UL)
+#define MODULES_LEN   (MODULES_END - MODULES_VADDR)
+
+#define _PAGE_BIT_PRESENT       0
+#define _PAGE_BIT_RW            1
+#define _PAGE_BIT_USER          2
+#define _PAGE_BIT_PWT           3
+#define _PAGE_BIT_PCD           4
+#define _PAGE_BIT_ACCESSED      5
+#define _PAGE_BIT_DIRTY         6
+#define _PAGE_BIT_PSE           7       /* 4 MB (or 2MB) page */
+#define _PAGE_BIT_GLOBAL        8       /* Global TLB entry PPro+ */
+#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */
+
+#define _PAGE_PRESENT   0x001
+#define _PAGE_RW        0x002
+#define _PAGE_USER      0x004
+#define _PAGE_PWT       0x008
+#define _PAGE_PCD       0x010
+#define _PAGE_ACCESSED  0x020
+#define _PAGE_DIRTY     0x040
+#define _PAGE_PSE       0x080   /* 2MB page */
+#define _PAGE_FILE      0x040   /* nonlinear file mapping, saved PTE; unset:swap */
+#define _PAGE_GLOBAL    0x100   /* Global TLB entry */
+
+#define _PAGE_PROTNONE  0x080   /* If not present */
+#define _PAGE_NX        (_AC(1,UL)<<_PAGE_BIT_NX)
+
+#define _PAGE_TABLE     (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
+#define _KERNPG_TABLE   (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)
+
+#define _PAGE_CHG_MASK  (PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
+
+#define PAGE_NONE       __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
+#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
+#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
+#define PAGE_COPY PAGE_COPY_NOEXEC
+#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
+#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define __PAGE_KERNEL \
+        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
+#define __PAGE_KERNEL_EXEC \
+        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
+#define __PAGE_KERNEL_NOCACHE \
+        (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
+#define __PAGE_KERNEL_RO \
+        (_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
+#define __PAGE_KERNEL_VSYSCALL \
+        (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
+#define __PAGE_KERNEL_VSYSCALL_NOCACHE \
+        (_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
+#define __PAGE_KERNEL_LARGE \
+        (__PAGE_KERNEL | _PAGE_PSE)
+#define __PAGE_KERNEL_LARGE_EXEC \
+        (__PAGE_KERNEL_EXEC | _PAGE_PSE)
+
+#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)
+
+#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
+#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
+#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
+#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
+#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
+#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
+#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
+#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
+
+/*         xwr */
+#define __P000  PAGE_NONE
+#define __P001  PAGE_READONLY
+#define __P010  PAGE_COPY
+#define __P011  PAGE_COPY
+#define __P100  PAGE_READONLY_EXEC
+#define __P101  PAGE_READONLY_EXEC
+#define __P110  PAGE_COPY_EXEC
+#define __P111  PAGE_COPY_EXEC
+
+#define __S000  PAGE_NONE
+#define __S001  PAGE_READONLY
+#define __S010  PAGE_SHARED
+#define __S011  PAGE_SHARED
+#define __S100  PAGE_READONLY_EXEC
+#define __S101  PAGE_READONLY_EXEC
+#define __S110  PAGE_SHARED_EXEC
+#define __S111  PAGE_SHARED_EXEC
+
+#ifndef __ASSEMBLY__
+
+static inline unsigned long pgd_bad(pgd_t pgd)
+{
+        return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
+}
+
+static inline unsigned long pud_bad(pud_t pud)
+{
+        return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
+}
+
+static inline unsigned long pmd_bad(pmd_t pmd)
+{
+        return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
+}
+
+#define pte_none(x)     (!pte_val(x))
+#define pte_present(x)  (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+#define pte_clear(mm,addr,xp)   do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
+
+#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
+                                                   right? */
+#define pte_page(x)     pfn_to_page(pte_pfn(x))
+#define pte_pfn(x)  ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
+
+static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
+{
+        pte_t pte;
+        pte_val(pte) = (page_nr << PAGE_SHIFT);
+        pte_val(pte) |= pgprot_val(pgprot);
+        pte_val(pte) &= __supported_pte_mask;
+        return pte;
+}
+
+/*
+ * The following only work if pte_present() is true.
+ * Undefined behaviour if not..
+ */
+#define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
+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_write(pte_t pte)          { return pte_val(pte) & _PAGE_RW; }
+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_PSE; }
+
+static inline pte_t pte_mkclean(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
+static inline pte_t pte_mkold(pte_t pte)        { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
+static inline pte_t pte_wrprotect(pte_t pte)    { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
+static inline pte_t pte_mkexec(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_NX)); return pte; }
+static inline pte_t pte_mkdirty(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
+static inline pte_t pte_mkyoung(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
+static inline pte_t pte_mkwrite(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
+static inline pte_t pte_mkhuge(pte_t pte)       { set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; }
+static inline pte_t pte_clrhuge(pte_t pte)      { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_PSE)); return pte; }
+
+struct vm_area_struct;
+
+static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
+{
+        if (!pte_young(*ptep))
+                return 0;
+        return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
+}
+
+static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+        clear_bit(_PAGE_BIT_RW, &ptep->pte);
+}
+
+/*
+ * Macro to mark a page protection value as "uncacheable".
+ */
+#define pgprot_noncached(prot)  (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
+
+static inline int pmd_large(pmd_t pte) { 
+        return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE; 
+}       
+
+
+/*
+ * Conversion functions: convert a page and protection to a page entry,
+ * and a page entry and page directory to the page they refer to.
+ */
+
+/*
+ * Level 4 access.
+ */
+#define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
+#define pgd_page(pgd)           (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
+#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
+#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
+#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
+#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
+#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
+
+/* PUD - Level3 access */
+/* to find an entry in a page-table-directory. */
+#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
+#define pud_page(pud)           (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
+#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
+#define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
+#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
+
+/* PMD  - Level 2 access */
+#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
+#define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
+
+#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
+#define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
+                        pmd_index(address))
+#define pmd_none(x)     (!pmd_val(x))
+#define pmd_present(x)  (pmd_val(x) & _PAGE_PRESENT)
+#define pmd_clear(xp)   do { set_pmd(xp, __pmd(0)); } while (0)
+#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
+#define pmd_pfn(x)  ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
+
+#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
+#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
+#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
+
+/* PTE - Level 1 access. */
+
+/* page, protection -> pte */
+#define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
+#define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
+ 
+/* Change flags of a PTE */
+static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
+{ 
+        pte_val(pte) &= _PAGE_CHG_MASK;
+        pte_val(pte) |= pgprot_val(newprot);
+        pte_val(pte) &= __supported_pte_mask;
+       return pte; 
+}
+
+#define pte_index(address) \
+                (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
+#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
+                        pte_index(address))
+
+/* x86-64 always has all page tables mapped. */
+#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
+#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
+#define pte_unmap(pte) /* NOP */
+#define pte_unmap_nested(pte) /* NOP */ 
+
+#define update_mmu_cache(vma,address,pte) do { } while (0)
+
+/* We only update the dirty/accessed state if we set
+ * the dirty bit by hand in the kernel, since the hardware
+ * will do the accessed bit for us, and we don't want to
+ * race with other CPU's that might be updating the dirty
+ * bit at the same time. */
+#define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
+#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
+({                                                                        \
+        int __changed = !pte_same(*(__ptep), __entry);                    \
+        if (__changed && __dirty) {                                       \
+                set_pte(__ptep, __entry);                                 \
+                flush_tlb_page(__vma, __address);                         \
+        }                                                                 \
+        __changed;                                                        \
+})
+
+/* Encode and de-code a swap entry */
+#define __swp_type(x)                   (((x).val >> 1) & 0x3f)
+#define __swp_offset(x)                 ((x).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) })
+#define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
+
+extern spinlock_t pgd_lock;
+extern struct list_head pgd_list;
+
+extern int kern_addr_valid(unsigned long addr); 
+
+pte_t *lookup_address(unsigned long addr);
+
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
+                remap_pfn_range(vma, vaddr, pfn, size, prot)
+
+#define HAVE_ARCH_UNMAPPED_AREA
+
+#define pgtable_cache_init()   do { } while (0)
+#define check_pgt_cache()      do { } while (0)
+
+#define PAGE_AGP    PAGE_KERNEL_NOCACHE
+#define HAVE_PAGE_AGP 1
+
+/* fs/proc/kcore.c */
+#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
+#define kc_offset_to_vaddr(o) \
+   (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
+
+#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
+#define __HAVE_ARCH_PTEP_SET_WRPROTECT
+#define __HAVE_ARCH_PTE_SAME
+#include <asm-generic/pgtable.h>
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _X86_64_PGTABLE_H */