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Linux kernel mirror (for testing)
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linux
1#ifndef _X86_64_PGTABLE_H
2#define _X86_64_PGTABLE_H
3
4#include <linux/const.h>
5#ifndef __ASSEMBLY__
6
7/*
8 * This file contains the functions and defines necessary to modify and use
9 * the x86-64 page table tree.
10 */
11#include <asm/processor.h>
12#include <linux/bitops.h>
13#include <linux/threads.h>
14#include <asm/pda.h>
15
16extern pud_t level3_kernel_pgt[512];
17extern pud_t level3_ident_pgt[512];
18extern pmd_t level2_kernel_pgt[512];
19extern pgd_t init_level4_pgt[];
20
21#define swapper_pg_dir init_level4_pgt
22
23extern void paging_init(void);
24
25#endif /* !__ASSEMBLY__ */
26
27#define SHARED_KERNEL_PMD 0
28
29/*
30 * PGDIR_SHIFT determines what a top-level page table entry can map
31 */
32#define PGDIR_SHIFT 39
33#define PTRS_PER_PGD 512
34
35/*
36 * 3rd level page
37 */
38#define PUD_SHIFT 30
39#define PTRS_PER_PUD 512
40
41/*
42 * PMD_SHIFT determines the size of the area a middle-level
43 * page table can map
44 */
45#define PMD_SHIFT 21
46#define PTRS_PER_PMD 512
47
48/*
49 * entries per page directory level
50 */
51#define PTRS_PER_PTE 512
52
53#ifndef __ASSEMBLY__
54
55#define pte_ERROR(e) \
56 printk("%s:%d: bad pte %p(%016lx).\n", \
57 __FILE__, __LINE__, &(e), pte_val(e))
58#define pmd_ERROR(e) \
59 printk("%s:%d: bad pmd %p(%016lx).\n", \
60 __FILE__, __LINE__, &(e), pmd_val(e))
61#define pud_ERROR(e) \
62 printk("%s:%d: bad pud %p(%016lx).\n", \
63 __FILE__, __LINE__, &(e), pud_val(e))
64#define pgd_ERROR(e) \
65 printk("%s:%d: bad pgd %p(%016lx).\n", \
66 __FILE__, __LINE__, &(e), pgd_val(e))
67
68#define pgd_none(x) (!pgd_val(x))
69#define pud_none(x) (!pud_val(x))
70
71struct mm_struct;
72
73static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
74 pte_t *ptep)
75{
76 *ptep = native_make_pte(0);
77}
78
79static inline void native_set_pte(pte_t *ptep, pte_t pte)
80{
81 *ptep = pte;
82}
83
84static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
85{
86 native_set_pte(ptep, pte);
87}
88
89static inline pte_t native_ptep_get_and_clear(pte_t *xp)
90{
91#ifdef CONFIG_SMP
92 return native_make_pte(xchg(&xp->pte, 0));
93#else
94 /* native_local_ptep_get_and_clear,
95 but duplicated because of cyclic dependency */
96 pte_t ret = *xp;
97 native_pte_clear(NULL, 0, xp);
98 return ret;
99#endif
100}
101
102static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
103{
104 *pmdp = pmd;
105}
106
107static inline void native_pmd_clear(pmd_t *pmd)
108{
109 native_set_pmd(pmd, native_make_pmd(0));
110}
111
112static inline void native_set_pud(pud_t *pudp, pud_t pud)
113{
114 *pudp = pud;
115}
116
117static inline void native_pud_clear(pud_t *pud)
118{
119 native_set_pud(pud, native_make_pud(0));
120}
121
122static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
123{
124 *pgdp = pgd;
125}
126
127static inline void native_pgd_clear(pgd_t *pgd)
128{
129 native_set_pgd(pgd, native_make_pgd(0));
130}
131
132#define pte_same(a, b) ((a).pte == (b).pte)
133
134#endif /* !__ASSEMBLY__ */
135
136#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
137#define PMD_MASK (~(PMD_SIZE - 1))
138#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
139#define PUD_MASK (~(PUD_SIZE - 1))
140#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
141#define PGDIR_MASK (~(PGDIR_SIZE - 1))
142
143
144#define MAXMEM _AC(0x00003fffffffffff, UL)
145#define VMALLOC_START _AC(0xffffc20000000000, UL)
146#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
147#define VMEMMAP_START _AC(0xffffe20000000000, UL)
148#define MODULES_VADDR _AC(0xffffffffa0000000, UL)
149#define MODULES_END _AC(0xfffffffffff00000, UL)
150#define MODULES_LEN (MODULES_END - MODULES_VADDR)
151
152#ifndef __ASSEMBLY__
153
154static inline unsigned long pgd_bad(pgd_t pgd)
155{
156 return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
157}
158
159static inline unsigned long pud_bad(pud_t pud)
160{
161 return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
162}
163
164static inline unsigned long pmd_bad(pmd_t pmd)
165{
166 return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
167}
168
169#define pte_none(x) (!pte_val((x)))
170#define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
171
172#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) /* FIXME: is this right? */
173#define pte_page(x) pfn_to_page(pte_pfn((x)))
174#define pte_pfn(x) ((pte_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
175
176/*
177 * Macro to mark a page protection value as "uncacheable".
178 */
179#define pgprot_noncached(prot) \
180 (__pgprot(pgprot_val((prot)) | _PAGE_PCD | _PAGE_PWT))
181
182/*
183 * Conversion functions: convert a page and protection to a page entry,
184 * and a page entry and page directory to the page they refer to.
185 */
186
187/*
188 * Level 4 access.
189 */
190#define pgd_page_vaddr(pgd) \
191 ((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_MASK))
192#define pgd_page(pgd) (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
193#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
194#define pgd_offset(mm, address) ((mm)->pgd + pgd_index((address)))
195#define pgd_offset_k(address) (init_level4_pgt + pgd_index((address)))
196#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
197static inline int pgd_large(pgd_t pgd) { return 0; }
198#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
199
200/* PUD - Level3 access */
201/* to find an entry in a page-table-directory. */
202#define pud_page_vaddr(pud) \
203 ((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
204#define pud_page(pud) (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
205#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
206#define pud_offset(pgd, address) \
207 ((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
208#define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
209
210static inline int pud_large(pud_t pte)
211{
212 return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
213 (_PAGE_PSE | _PAGE_PRESENT);
214}
215
216/* PMD - Level 2 access */
217#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_MASK))
218#define pmd_page(pmd) (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
219
220#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
221#define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
222 pmd_index(address))
223#define pmd_none(x) (!pmd_val((x)))
224#define pmd_present(x) (pmd_val((x)) & _PAGE_PRESENT)
225#define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
226#define pmd_pfn(x) ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
227
228#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
229#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
230 _PAGE_FILE })
231#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
232
233/* PTE - Level 1 access. */
234
235/* page, protection -> pte */
236#define mk_pte(page, pgprot) pfn_pte(page_to_pfn((page)), (pgprot))
237
238#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
239#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
240 pte_index((address)))
241
242/* x86-64 always has all page tables mapped. */
243#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
244#define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
245#define pte_unmap(pte) /* NOP */
246#define pte_unmap_nested(pte) /* NOP */
247
248#define update_mmu_cache(vma, address, pte) do { } while (0)
249
250extern int direct_gbpages;
251
252/* Encode and de-code a swap entry */
253#define __swp_type(x) (((x).val >> 1) & 0x3f)
254#define __swp_offset(x) ((x).val >> 8)
255#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | \
256 ((offset) << 8) })
257#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
258#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
259
260extern int kern_addr_valid(unsigned long addr);
261extern void cleanup_highmap(void);
262
263#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
264 remap_pfn_range(vma, vaddr, pfn, size, prot)
265
266#define HAVE_ARCH_UNMAPPED_AREA
267#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
268
269#define pgtable_cache_init() do { } while (0)
270#define check_pgt_cache() do { } while (0)
271
272#define PAGE_AGP PAGE_KERNEL_NOCACHE
273#define HAVE_PAGE_AGP 1
274
275/* fs/proc/kcore.c */
276#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
277#define kc_offset_to_vaddr(o) \
278 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1))) \
279 ? ((o) | ~__VIRTUAL_MASK) \
280 : (o))
281
282#define __HAVE_ARCH_PTE_SAME
283#endif /* !__ASSEMBLY__ */
284
285#endif /* _X86_64_PGTABLE_H */