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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 1
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", __FILE__, __LINE__, &(e), pte_val(e))
57#define pmd_ERROR(e) \
58 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
59#define pud_ERROR(e) \
60 printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
61#define pgd_ERROR(e) \
62 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
63
64#define pgd_none(x) (!pgd_val(x))
65#define pud_none(x) (!pud_val(x))
66
67struct mm_struct;
68
69static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
70 pte_t *ptep)
71{
72 *ptep = native_make_pte(0);
73}
74
75static inline void native_set_pte(pte_t *ptep, pte_t pte)
76{
77 *ptep = pte;
78}
79
80static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
81{
82 native_set_pte(ptep, pte);
83}
84
85static inline pte_t native_ptep_get_and_clear(pte_t *xp)
86{
87#ifdef CONFIG_SMP
88 return native_make_pte(xchg(&xp->pte, 0));
89#else
90 /* native_local_ptep_get_and_clear, but duplicated because of cyclic dependency */
91 pte_t ret = *xp;
92 native_pte_clear(NULL, 0, xp);
93 return ret;
94#endif
95}
96
97static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
98{
99 *pmdp = pmd;
100}
101
102static inline void native_pmd_clear(pmd_t *pmd)
103{
104 native_set_pmd(pmd, native_make_pmd(0));
105}
106
107static inline void native_set_pud(pud_t *pudp, pud_t pud)
108{
109 *pudp = pud;
110}
111
112static inline void native_pud_clear(pud_t *pud)
113{
114 native_set_pud(pud, native_make_pud(0));
115}
116
117static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
118{
119 *pgdp = pgd;
120}
121
122static inline void native_pgd_clear(pgd_t * pgd)
123{
124 native_set_pgd(pgd, native_make_pgd(0));
125}
126
127#define pte_same(a, b) ((a).pte == (b).pte)
128
129#endif /* !__ASSEMBLY__ */
130
131#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
132#define PMD_MASK (~(PMD_SIZE-1))
133#define PUD_SIZE (_AC(1,UL) << PUD_SHIFT)
134#define PUD_MASK (~(PUD_SIZE-1))
135#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
136#define PGDIR_MASK (~(PGDIR_SIZE-1))
137
138
139#define MAXMEM _AC(0x3fffffffffff, UL)
140#define VMALLOC_START _AC(0xffffc20000000000, UL)
141#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
142#define VMEMMAP_START _AC(0xffffe20000000000, UL)
143#define MODULES_VADDR _AC(0xffffffff88000000, UL)
144#define MODULES_END _AC(0xfffffffffff00000, UL)
145#define MODULES_LEN (MODULES_END - MODULES_VADDR)
146
147#ifndef __ASSEMBLY__
148
149static inline unsigned long pgd_bad(pgd_t pgd)
150{
151 return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
152}
153
154static inline unsigned long pud_bad(pud_t pud)
155{
156 return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
157}
158
159static inline unsigned long pmd_bad(pmd_t pmd)
160{
161 return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
162}
163
164#define pte_none(x) (!pte_val(x))
165#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
166
167#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this right? */
168#define pte_page(x) pfn_to_page(pte_pfn(x))
169#define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
170
171/*
172 * Macro to mark a page protection value as "uncacheable".
173 */
174#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))
175
176
177/*
178 * Conversion functions: convert a page and protection to a page entry,
179 * and a page entry and page directory to the page they refer to.
180 */
181
182/*
183 * Level 4 access.
184 */
185#define pgd_page_vaddr(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
186#define pgd_page(pgd) (pfn_to_page(pgd_val(pgd) >> PAGE_SHIFT))
187#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
188#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
189#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
190#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
191#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
192
193/* PUD - Level3 access */
194/* to find an entry in a page-table-directory. */
195#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
196#define pud_page(pud) (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
197#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
198#define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
199#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
200
201static inline int pud_large(pud_t pte)
202{
203 return (pud_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
204 (_PAGE_PSE|_PAGE_PRESENT);
205}
206
207/* PMD - Level 2 access */
208#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
209#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
210
211#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
212#define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
213 pmd_index(address))
214#define pmd_none(x) (!pmd_val(x))
215#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
216#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
217#define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
218
219#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
220#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | _PAGE_FILE })
221#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
222
223/* PTE - Level 1 access. */
224
225/* page, protection -> pte */
226#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
227
228#define pte_index(address) \
229 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
230#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
231 pte_index(address))
232
233/* x86-64 always has all page tables mapped. */
234#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
235#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
236#define pte_unmap(pte) /* NOP */
237#define pte_unmap_nested(pte) /* NOP */
238
239#define update_mmu_cache(vma,address,pte) do { } while (0)
240
241/* Encode and de-code a swap entry */
242#define __swp_type(x) (((x).val >> 1) & 0x3f)
243#define __swp_offset(x) ((x).val >> 8)
244#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
245#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
246#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
247
248extern int kern_addr_valid(unsigned long addr);
249
250#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
251 remap_pfn_range(vma, vaddr, pfn, size, prot)
252
253#define HAVE_ARCH_UNMAPPED_AREA
254#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
255
256#define pgtable_cache_init() do { } while (0)
257#define check_pgt_cache() do { } while (0)
258
259#define PAGE_AGP PAGE_KERNEL_NOCACHE
260#define HAVE_PAGE_AGP 1
261
262/* fs/proc/kcore.c */
263#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
264#define kc_offset_to_vaddr(o) \
265 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
266
267#define __HAVE_ARCH_PTE_SAME
268#endif /* !__ASSEMBLY__ */
269
270#endif /* _X86_64_PGTABLE_H */