aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/pgtable_64.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm/pgtable_64.h')
-rw-r--r--arch/x86/include/asm/pgtable_64.h291
1 files changed, 291 insertions, 0 deletions
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
new file mode 100644
index 00000000000..ba09289acca
--- /dev/null
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -0,0 +1,291 @@
+#ifndef _ASM_X86_PGTABLE_64_H
+#define _ASM_X86_PGTABLE_64_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 <linux/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 pmd_t level2_fixmap_pgt[512];
+extern pmd_t level2_ident_pgt[512];
+extern pgd_t init_level4_pgt[];
+
+#define swapper_pg_dir init_level4_pgt
+
+extern void paging_init(void);
+
+#endif /* !__ASSEMBLY__ */
+
+#define SHARED_KERNEL_PMD 0
+
+/*
+ * 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))
+
+struct mm_struct;
+
+void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
+
+
+static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep)
+{
+ *ptep = native_make_pte(0);
+}
+
+static inline void native_set_pte(pte_t *ptep, pte_t pte)
+{
+ *ptep = pte;
+}
+
+static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
+{
+ native_set_pte(ptep, pte);
+}
+
+static inline pte_t native_ptep_get_and_clear(pte_t *xp)
+{
+#ifdef CONFIG_SMP
+ return native_make_pte(xchg(&xp->pte, 0));
+#else
+ /* native_local_ptep_get_and_clear,
+ but duplicated because of cyclic dependency */
+ pte_t ret = *xp;
+ native_pte_clear(NULL, 0, xp);
+ return ret;
+#endif
+}
+
+static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
+{
+ *pmdp = pmd;
+}
+
+static inline void native_pmd_clear(pmd_t *pmd)
+{
+ native_set_pmd(pmd, native_make_pmd(0));
+}
+
+static inline void native_set_pud(pud_t *pudp, pud_t pud)
+{
+ *pudp = pud;
+}
+
+static inline void native_pud_clear(pud_t *pud)
+{
+ native_set_pud(pud, native_make_pud(0));
+}
+
+static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
+{
+ *pgdp = pgd;
+}
+
+static inline void native_pgd_clear(pgd_t *pgd)
+{
+ native_set_pgd(pgd, native_make_pgd(0));
+}
+
+#define pte_same(a, b) ((a).pte == (b).pte)
+
+#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 MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
+#define VMALLOC_START _AC(0xffffc20000000000, UL)
+#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
+#define VMEMMAP_START _AC(0xffffe20000000000, UL)
+#define MODULES_VADDR _AC(0xffffffffa0000000, UL)
+#define MODULES_END _AC(0xffffffffff000000, UL)
+#define MODULES_LEN (MODULES_END - MODULES_VADDR)
+
+#ifndef __ASSEMBLY__
+
+static inline int pgd_bad(pgd_t pgd)
+{
+ return (pgd_val(pgd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
+}
+
+static inline int pud_bad(pud_t pud)
+{
+ return (pud_val(pud) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
+}
+
+static inline int pmd_bad(pmd_t pmd)
+{
+ return (pmd_val(pmd) & ~(PTE_PFN_MASK | _PAGE_USER)) != _KERNPG_TABLE;
+}
+
+#define pte_none(x) (!pte_val((x)))
+#define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
+
+#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) /* FIXME: is this right? */
+
+/*
+ * 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_PFN_MASK))
+#define pgd_page(pgd) (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
+#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
+static inline int pgd_large(pgd_t pgd) { return 0; }
+#define mk_kernel_pgd(address) __pgd((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)
+
+static inline int pud_large(pud_t pte)
+{
+ return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
+ (_PAGE_PSE | _PAGE_PRESENT);
+}
+
+/* PMD - Level 2 access */
+#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_PFN_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 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) { .pte = ((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 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)
+
+extern int direct_gbpages;
+
+/* Encode and de-code a swap entry */
+#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
+#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
+#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
+#else
+#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
+#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
+#endif
+
+#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
+
+#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
+ & ((1U << SWP_TYPE_BITS) - 1))
+#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
+#define __swp_entry(type, offset) ((swp_entry_t) { \
+ ((type) << (_PAGE_BIT_PRESENT + 1)) \
+ | ((offset) << SWP_OFFSET_SHIFT) })
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
+#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
+
+extern int kern_addr_valid(unsigned long addr);
+extern void cleanup_highmap(void);
+
+#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
+ remap_pfn_range(vma, vaddr, pfn, size, prot)
+
+#define HAVE_ARCH_UNMAPPED_AREA
+#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
+
+#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_PTE_SAME
+#endif /* !__ASSEMBLY__ */
+
+#endif /* _ASM_X86_PGTABLE_64_H */