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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _X86_64_PGTABLE_H
2#define _X86_64_PGTABLE_H
3
Randy Dunlap6df95fd2007-05-08 00:31:11 -07004#include <linux/const.h>
Vivek Goyal9d291e72007-05-02 19:27:06 +02005#ifndef __ASSEMBLY__
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007/*
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>
Jiri Slaby1977f032007-10-18 23:40:25 -070012#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/threads.h>
14#include <asm/pda.h>
15
16extern pud_t level3_kernel_pgt[512];
Linus Torvalds1da177e2005-04-16 15:20:36 -070017extern pud_t level3_ident_pgt[512];
18extern pmd_t level2_kernel_pgt[512];
19extern pgd_t init_level4_pgt[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Linus Torvaldse3ebadd2007-05-07 08:44:24 -070021#define swapper_pg_dir init_level4_pgt
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Linus Torvalds1da177e2005-04-16 15:20:36 -070023extern void paging_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Vivek Goyal9d291e72007-05-02 19:27:06 +020025#endif /* !__ASSEMBLY__ */
26
Ingo Molnare4b71dc2008-01-30 13:34:04 +010027#define SHARED_KERNEL_PMD 1
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029/*
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
Vivek Goyal9d291e72007-05-02 19:27:06 +020053#ifndef __ASSEMBLY__
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#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
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080067struct mm_struct;
68
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +010069static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
70 pte_t *ptep)
Zachary Amsden61e06032005-09-03 15:55:06 -070071{
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +010072 *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
Ingo Molnarb65e6392008-01-30 13:34:01 +010080static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
81{
82 native_set_pte(ptep, pte);
83}
84
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +010085static 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));
Zachary Amsden61e06032005-09-03 15:55:06 -0700125}
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#define pte_same(a, b) ((a).pte == (b).pte)
128
Vivek Goyal9d291e72007-05-02 19:27:06 +0200129#endif /* !__ASSEMBLY__ */
130
131#define PMD_SIZE (_AC(1,UL) << PMD_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132#define PMD_MASK (~(PMD_SIZE-1))
Vivek Goyal9d291e72007-05-02 19:27:06 +0200133#define PUD_SIZE (_AC(1,UL) << PUD_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134#define PUD_MASK (~(PUD_SIZE-1))
Vivek Goyal9d291e72007-05-02 19:27:06 +0200135#define PGDIR_SIZE (_AC(1,UL) << PGDIR_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#define PGDIR_MASK (~(PGDIR_SIZE-1))
137
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Randy Dunlap63f65642007-05-08 00:31:14 -0700139#define MAXMEM _AC(0x3fffffffffff, UL)
140#define VMALLOC_START _AC(0xffffc20000000000, UL)
141#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
Christoph Lameter0889eba2007-10-16 01:24:15 -0700142#define VMEMMAP_START _AC(0xffffe20000000000, UL)
Randy Dunlap63f65642007-05-08 00:31:14 -0700143#define MODULES_VADDR _AC(0xffffffff88000000, UL)
144#define MODULES_END _AC(0xfffffffffff00000, UL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145#define MODULES_LEN (MODULES_END - MODULES_VADDR)
146
Vivek Goyal9d291e72007-05-02 19:27:06 +0200147#ifndef __ASSEMBLY__
148
Jan Beulicheab724e2006-12-07 02:14:09 +0100149static inline unsigned long pgd_bad(pgd_t pgd)
150{
151 return pgd_val(pgd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
152}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154static inline unsigned long pud_bad(pud_t pud)
155{
Linus Torvaldsa345b4b2008-03-03 10:02:44 -0800156 return pud_val(pud) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
Jan Beulicheab724e2006-12-07 02:14:09 +0100157}
158
159static inline unsigned long pmd_bad(pmd_t pmd)
160{
Linus Torvaldsa345b4b2008-03-03 10:02:44 -0800161 return pmd_val(pmd) & ~(PTE_MASK | _KERNPG_TABLE | _PAGE_USER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
164#define pte_none(x) (!pte_val(x))
165#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
Joerg Roedel1c6f7032008-01-30 13:31:02 +0100167#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this right? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168#define pte_page(x) pfn_to_page(pte_pfn(x))
Andi Kleen6b75aee2005-11-05 17:25:53 +0100169#define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182/*
183 * Level 4 access.
184 */
Dave McCracken46a82b22006-09-25 23:31:48 -0700185#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))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187#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)
H. Peter Anvine00fc5422008-02-19 16:18:32 +0100191static inline int pgd_large(pgd_t pgd) { return 0; }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })
193
194/* PUD - Level3 access */
195/* to find an entry in a page-table-directory. */
Dave McCracken46a82b22006-09-25 23:31:48 -0700196#define pud_page_vaddr(pud) ((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
197#define pud_page(pud) (pfn_to_page(pud_val(pud) >> PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
Dave McCracken46a82b22006-09-25 23:31:48 -0700199#define pud_offset(pgd, address) ((pud_t *) pgd_page_vaddr(*(pgd)) + pud_index(address))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
201
Andi Kleen61e19a32008-02-04 16:48:09 +0100202static inline int pud_large(pud_t pte)
203{
204 return (pud_val(pte) & (_PAGE_PSE|_PAGE_PRESENT)) ==
205 (_PAGE_PSE|_PAGE_PRESENT);
206}
207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208/* PMD - Level 2 access */
Dave McCracken46a82b22006-09-25 23:31:48 -0700209#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
211
212#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
Dave McCracken46a82b22006-09-25 23:31:48 -0700213#define pmd_offset(dir, address) ((pmd_t *) pud_page_vaddr(*(dir)) + \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 pmd_index(address))
215#define pmd_none(x) (!pmd_val(x))
216#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
Andi Kleen6b75aee2005-11-05 17:25:53 +0100218#define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
Jeremy Fitzhardingec8e53932008-01-30 13:32:57 +0100221#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | _PAGE_FILE })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
223
224/* PTE - Level 1 access. */
225
226/* page, protection -> pte */
227#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229#define pte_index(address) \
Kirill Korotaev1294b112005-09-30 10:32:19 +0400230 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
Dave McCracken46a82b22006-09-25 23:31:48 -0700231#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 pte_index(address))
233
234/* x86-64 always has all page tables mapped. */
235#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
236#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
237#define pte_unmap(pte) /* NOP */
238#define pte_unmap_nested(pte) /* NOP */
239
240#define update_mmu_cache(vma,address,pte) do { } while (0)
241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242/* Encode and de-code a swap entry */
243#define __swp_type(x) (((x).val >> 1) & 0x3f)
244#define __swp_offset(x) ((x).val >> 8)
245#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
246#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
Jeremy Fitzhardingec8e53932008-01-30 13:32:57 +0100247#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249extern int kern_addr_valid(unsigned long addr);
Thomas Gleixner31eedd82008-02-15 17:29:12 +0100250extern void cleanup_highmap(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
253 remap_pfn_range(vma, vaddr, pfn, size, prot)
254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255#define HAVE_ARCH_UNMAPPED_AREA
Jiri Kosinacc503c12008-01-30 13:31:07 +0100256#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258#define pgtable_cache_init() do { } while (0)
Linus Torvaldsda8f1532007-09-21 12:09:41 -0700259#define check_pgt_cache() do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261#define PAGE_AGP PAGE_KERNEL_NOCACHE
262#define HAVE_PAGE_AGP 1
263
264/* fs/proc/kcore.c */
265#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
266#define kc_offset_to_vaddr(o) \
267 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))
268
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269#define __HAVE_ARCH_PTE_SAME
Vivek Goyal9d291e72007-05-02 19:27:06 +0200270#endif /* !__ASSEMBLY__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272#endif /* _X86_64_PGTABLE_H */