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 pte_t level1_fixmap_pgt[512];
23extern pgd_t init_level4_pgt[];
24
25#define swapper_pg_dir init_level4_pgt
26
27extern void paging_init(void);
28
29#define pte_ERROR(e)					\
30	pr_err("%s:%d: bad pte %p(%016lx)\n",		\
31	       __FILE__, __LINE__, &(e), pte_val(e))
32#define pmd_ERROR(e)					\
33	pr_err("%s:%d: bad pmd %p(%016lx)\n",		\
34	       __FILE__, __LINE__, &(e), pmd_val(e))
35#define pud_ERROR(e)					\
36	pr_err("%s:%d: bad pud %p(%016lx)\n",		\
37	       __FILE__, __LINE__, &(e), pud_val(e))
38#define pgd_ERROR(e)					\
39	pr_err("%s:%d: bad pgd %p(%016lx)\n",		\
40	       __FILE__, __LINE__, &(e), pgd_val(e))
41
42struct mm_struct;
43
44void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
45
46
47static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
48				    pte_t *ptep)
49{
50	*ptep = native_make_pte(0);
51}
52
53static inline void native_set_pte(pte_t *ptep, pte_t pte)
54{
55	*ptep = pte;
56}
57
58static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
59{
60	native_set_pte(ptep, pte);
61}
62
63static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
64{
65	*pmdp = pmd;
66}
67
68static inline void native_pmd_clear(pmd_t *pmd)
69{
70	native_set_pmd(pmd, native_make_pmd(0));
71}
72
73static inline pte_t native_ptep_get_and_clear(pte_t *xp)
74{
75#ifdef CONFIG_SMP
76	return native_make_pte(xchg(&xp->pte, 0));
77#else
78	/* native_local_ptep_get_and_clear,
79	   but duplicated because of cyclic dependency */
80	pte_t ret = *xp;
81	native_pte_clear(NULL, 0, xp);
82	return ret;
83#endif
84}
85
86static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
87{
88#ifdef CONFIG_SMP
89	return native_make_pmd(xchg(&xp->pmd, 0));
90#else
91	/* native_local_pmdp_get_and_clear,
92	   but duplicated because of cyclic dependency */
93	pmd_t ret = *xp;
94	native_pmd_clear(xp);
95	return ret;
96#endif
97}
98
99static inline void native_set_pud(pud_t *pudp, pud_t pud)
100{
101	*pudp = pud;
102}
103
104static inline void native_pud_clear(pud_t *pud)
105{
106	native_set_pud(pud, native_make_pud(0));
107}
108
109static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
110{
111	*pgdp = pgd;
112}
113
114static inline void native_pgd_clear(pgd_t *pgd)
115{
116	native_set_pgd(pgd, native_make_pgd(0));
117}
118
119extern void sync_global_pgds(unsigned long start, unsigned long end,
120			     int removed);
121
122/*
123 * Conversion functions: convert a page and protection to a page entry,
124 * and a page entry and page directory to the page they refer to.
125 */
126
127/*
128 * Level 4 access.
129 */
130static inline int pgd_large(pgd_t pgd) { return 0; }
131#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
132
133/* PUD - Level3 access */
134
135/* PMD  - Level 2 access */
136
137/* PTE - Level 1 access. */
138
139/* x86-64 always has all page tables mapped. */
140#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
141#define pte_unmap(pte) ((void)(pte))/* NOP */
142
143/* Encode and de-code a swap entry */
144#define SWP_TYPE_BITS 5
145#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
146
147#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
148
149#define __swp_type(x)			(((x).val >> (_PAGE_BIT_PRESENT + 1)) \
150					 & ((1U << SWP_TYPE_BITS) - 1))
151#define __swp_offset(x)			((x).val >> SWP_OFFSET_SHIFT)
152#define __swp_entry(type, offset)	((swp_entry_t) { \
153					 ((type) << (_PAGE_BIT_PRESENT + 1)) \
154					 | ((offset) << SWP_OFFSET_SHIFT) })
155#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
156#define __swp_entry_to_pte(x)		((pte_t) { .pte = (x).val })
157
158extern int kern_addr_valid(unsigned long addr);
159extern void cleanup_highmap(void);
160
161#define HAVE_ARCH_UNMAPPED_AREA
162#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
163
164#define pgtable_cache_init()   do { } while (0)
165#define check_pgt_cache()      do { } while (0)
166
167#define PAGE_AGP    PAGE_KERNEL_NOCACHE
168#define HAVE_PAGE_AGP 1
169
170/* fs/proc/kcore.c */
171#define	kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
172#define	kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
173
174#define __HAVE_ARCH_PTE_SAME
175
176#define vmemmap ((struct page *)VMEMMAP_START)
177
178extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
179extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
180
181#endif /* !__ASSEMBLY__ */
182
183#endif /* _ASM_X86_PGTABLE_64_H */
184