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Linux kernel mirror (for testing)
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1#ifndef _ASM_X86_PGTABLE_64_H
2#define _ASM_X86_PGTABLE_64_H
3
4#include <linux/const.h>
5#include <asm/pgtable_64_types.h>
6
7#ifndef __ASSEMBLY__
8
9/*
10 * This file contains the functions and defines necessary to modify and use
11 * the x86-64 page table tree.
12 */
13#include <asm/processor.h>
14#include <linux/bitops.h>
15#include <linux/threads.h>
16
17extern pud_t level3_kernel_pgt[512];
18extern pud_t level3_ident_pgt[512];
19extern pmd_t level2_kernel_pgt[512];
20extern pmd_t level2_fixmap_pgt[512];
21extern pmd_t level2_ident_pgt[512];
22extern pgd_t init_level4_pgt[];
23
24#define swapper_pg_dir init_level4_pgt
25
26extern void paging_init(void);
27
28#define pte_ERROR(e) \
29 printk("%s:%d: bad pte %p(%016lx).\n", \
30 __FILE__, __LINE__, &(e), pte_val(e))
31#define pmd_ERROR(e) \
32 printk("%s:%d: bad pmd %p(%016lx).\n", \
33 __FILE__, __LINE__, &(e), pmd_val(e))
34#define pud_ERROR(e) \
35 printk("%s:%d: bad pud %p(%016lx).\n", \
36 __FILE__, __LINE__, &(e), pud_val(e))
37#define pgd_ERROR(e) \
38 printk("%s:%d: bad pgd %p(%016lx).\n", \
39 __FILE__, __LINE__, &(e), pgd_val(e))
40
41struct mm_struct;
42
43void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
44
45
46static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
47 pte_t *ptep)
48{
49 *ptep = native_make_pte(0);
50}
51
52static inline void native_set_pte(pte_t *ptep, pte_t pte)
53{
54 *ptep = pte;
55}
56
57static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
58{
59 native_set_pte(ptep, pte);
60}
61
62static inline pte_t native_ptep_get_and_clear(pte_t *xp)
63{
64#ifdef CONFIG_SMP
65 return native_make_pte(xchg(&xp->pte, 0));
66#else
67 /* native_local_ptep_get_and_clear,
68 but duplicated because of cyclic dependency */
69 pte_t ret = *xp;
70 native_pte_clear(NULL, 0, xp);
71 return ret;
72#endif
73}
74
75static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
76{
77 *pmdp = pmd;
78}
79
80static inline void native_pmd_clear(pmd_t *pmd)
81{
82 native_set_pmd(pmd, native_make_pmd(0));
83}
84
85static inline void native_set_pud(pud_t *pudp, pud_t pud)
86{
87 *pudp = pud;
88}
89
90static inline void native_pud_clear(pud_t *pud)
91{
92 native_set_pud(pud, native_make_pud(0));
93}
94
95static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
96{
97 *pgdp = pgd;
98}
99
100static inline void native_pgd_clear(pgd_t *pgd)
101{
102 native_set_pgd(pgd, native_make_pgd(0));
103}
104
105/*
106 * Conversion functions: convert a page and protection to a page entry,
107 * and a page entry and page directory to the page they refer to.
108 */
109
110/*
111 * Level 4 access.
112 */
113static inline int pgd_large(pgd_t pgd) { return 0; }
114#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
115
116/* PUD - Level3 access */
117
118/* PMD - Level 2 access */
119#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
120#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
121 _PAGE_FILE })
122#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
123
124/* PTE - Level 1 access. */
125
126/* x86-64 always has all page tables mapped. */
127#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
128#define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
129#define pte_unmap(pte) /* NOP */
130#define pte_unmap_nested(pte) /* NOP */
131
132#define update_mmu_cache(vma, address, ptep) do { } while (0)
133
134/* Encode and de-code a swap entry */
135#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
136#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
137#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
138#else
139#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
140#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
141#endif
142
143#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
144
145#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
146 & ((1U << SWP_TYPE_BITS) - 1))
147#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
148#define __swp_entry(type, offset) ((swp_entry_t) { \
149 ((type) << (_PAGE_BIT_PRESENT + 1)) \
150 | ((offset) << SWP_OFFSET_SHIFT) })
151#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
152#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
153
154extern int kern_addr_valid(unsigned long addr);
155extern void cleanup_highmap(void);
156
157#define HAVE_ARCH_UNMAPPED_AREA
158#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
159
160#define pgtable_cache_init() do { } while (0)
161#define check_pgt_cache() do { } while (0)
162
163#define PAGE_AGP PAGE_KERNEL_NOCACHE
164#define HAVE_PAGE_AGP 1
165
166/* fs/proc/kcore.c */
167#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
168#define kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
169
170#define __HAVE_ARCH_PTE_SAME
171#endif /* !__ASSEMBLY__ */
172
173#endif /* _ASM_X86_PGTABLE_64_H */