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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];
Jeremy Fitzhardinge084a2a42008-07-08 15:06:50 -070019extern pmd_t level2_fixmap_pgt[512];
20extern pmd_t level2_ident_pgt[512];
Linus Torvalds1da177e2005-04-16 15:20:36 -070021extern pgd_t init_level4_pgt[];
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Linus Torvaldse3ebadd2007-05-07 08:44:24 -070023#define swapper_pg_dir init_level4_pgt
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025extern void paging_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Vivek Goyal9d291e72007-05-02 19:27:06 +020027#endif /* !__ASSEMBLY__ */
28
Jeremy Fitzhardinge85958b42008-03-17 16:37:14 -070029#define SHARED_KERNEL_PMD 0
Ingo Molnare4b71dc2008-01-30 13:34:04 +010030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031/*
32 * PGDIR_SHIFT determines what a top-level page table entry can map
33 */
34#define PGDIR_SHIFT 39
35#define PTRS_PER_PGD 512
36
37/*
38 * 3rd level page
39 */
40#define PUD_SHIFT 30
41#define PTRS_PER_PUD 512
42
43/*
44 * PMD_SHIFT determines the size of the area a middle-level
45 * page table can map
46 */
47#define PMD_SHIFT 21
48#define PTRS_PER_PMD 512
49
50/*
51 * entries per page directory level
52 */
53#define PTRS_PER_PTE 512
54
Vivek Goyal9d291e72007-05-02 19:27:06 +020055#ifndef __ASSEMBLY__
56
Joe Perches7f944012008-03-23 01:03:11 -070057#define pte_ERROR(e) \
58 printk("%s:%d: bad pte %p(%016lx).\n", \
59 __FILE__, __LINE__, &(e), pte_val(e))
60#define pmd_ERROR(e) \
61 printk("%s:%d: bad pmd %p(%016lx).\n", \
62 __FILE__, __LINE__, &(e), pmd_val(e))
63#define pud_ERROR(e) \
64 printk("%s:%d: bad pud %p(%016lx).\n", \
65 __FILE__, __LINE__, &(e), pud_val(e))
66#define pgd_ERROR(e) \
67 printk("%s:%d: bad pgd %p(%016lx).\n", \
68 __FILE__, __LINE__, &(e), pgd_val(e))
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70#define pgd_none(x) (!pgd_val(x))
71#define pud_none(x) (!pud_val(x))
72
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080073struct mm_struct;
74
Eduardo Habkost0814e0b2008-06-25 00:19:22 -040075void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
76
77
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +010078static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
79 pte_t *ptep)
Zachary Amsden61e06032005-09-03 15:55:06 -070080{
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +010081 *ptep = native_make_pte(0);
82}
83
84static inline void native_set_pte(pte_t *ptep, pte_t pte)
85{
86 *ptep = pte;
87}
88
Ingo Molnarb65e6392008-01-30 13:34:01 +010089static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
90{
91 native_set_pte(ptep, pte);
92}
93
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +010094static inline pte_t native_ptep_get_and_clear(pte_t *xp)
95{
96#ifdef CONFIG_SMP
97 return native_make_pte(xchg(&xp->pte, 0));
98#else
Joe Perches7f944012008-03-23 01:03:11 -070099 /* native_local_ptep_get_and_clear,
100 but duplicated because of cyclic dependency */
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100101 pte_t ret = *xp;
102 native_pte_clear(NULL, 0, xp);
103 return ret;
104#endif
105}
106
107static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
108{
109 *pmdp = pmd;
110}
111
112static inline void native_pmd_clear(pmd_t *pmd)
113{
114 native_set_pmd(pmd, native_make_pmd(0));
115}
116
117static inline void native_set_pud(pud_t *pudp, pud_t pud)
118{
119 *pudp = pud;
120}
121
122static inline void native_pud_clear(pud_t *pud)
123{
124 native_set_pud(pud, native_make_pud(0));
125}
126
127static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
128{
129 *pgdp = pgd;
130}
131
Joe Perches7f944012008-03-23 01:03:11 -0700132static inline void native_pgd_clear(pgd_t *pgd)
Jeremy Fitzhardinge48916452008-01-30 13:32:58 +0100133{
134 native_set_pgd(pgd, native_make_pgd(0));
Zachary Amsden61e06032005-09-03 15:55:06 -0700135}
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137#define pte_same(a, b) ((a).pte == (b).pte)
138
Vivek Goyal9d291e72007-05-02 19:27:06 +0200139#endif /* !__ASSEMBLY__ */
140
Joe Perches7f944012008-03-23 01:03:11 -0700141#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
142#define PMD_MASK (~(PMD_SIZE - 1))
143#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
144#define PUD_MASK (~(PUD_SIZE - 1))
145#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
146#define PGDIR_MASK (~(PGDIR_SIZE - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Joe Perches7f944012008-03-23 01:03:11 -0700149#define MAXMEM _AC(0x00003fffffffffff, UL)
Randy Dunlap63f65642007-05-08 00:31:14 -0700150#define VMALLOC_START _AC(0xffffc20000000000, UL)
151#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
Christoph Lameter0889eba2007-10-16 01:24:15 -0700152#define VMEMMAP_START _AC(0xffffe20000000000, UL)
Ingo Molnar85eb69a2008-02-21 12:50:51 +0100153#define MODULES_VADDR _AC(0xffffffffa0000000, UL)
Randy Dunlap63f65642007-05-08 00:31:14 -0700154#define MODULES_END _AC(0xfffffffffff00000, UL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155#define MODULES_LEN (MODULES_END - MODULES_VADDR)
156
Vivek Goyal9d291e72007-05-02 19:27:06 +0200157#ifndef __ASSEMBLY__
158
Hugh Dickinsa8375bd2008-05-20 13:59:47 +0100159static inline int pgd_bad(pgd_t pgd)
Jan Beulicheab724e2006-12-07 02:14:09 +0100160{
Hugh Dickinsa8375bd2008-05-20 13:59:47 +0100161 return (pgd_val(pgd) & ~(PTE_MASK | _PAGE_USER)) != _KERNPG_TABLE;
Jan Beulicheab724e2006-12-07 02:14:09 +0100162}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Hugh Dickinsa8375bd2008-05-20 13:59:47 +0100164static inline int pud_bad(pud_t pud)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Hugh Dickinsa8375bd2008-05-20 13:59:47 +0100166 return (pud_val(pud) & ~(PTE_MASK | _PAGE_USER)) != _KERNPG_TABLE;
Jan Beulicheab724e2006-12-07 02:14:09 +0100167}
168
Hugh Dickinsa8375bd2008-05-20 13:59:47 +0100169static inline int pmd_bad(pmd_t pmd)
Jan Beulicheab724e2006-12-07 02:14:09 +0100170{
Hugh Dickinsa8375bd2008-05-20 13:59:47 +0100171 return (pmd_val(pmd) & ~(PTE_MASK | _PAGE_USER)) != _KERNPG_TABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
Joe Perches7f944012008-03-23 01:03:11 -0700174#define pte_none(x) (!pte_val((x)))
175#define pte_present(x) (pte_val((x)) & (_PAGE_PRESENT | _PAGE_PROTNONE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Joe Perches7f944012008-03-23 01:03:11 -0700177#define pages_to_mb(x) ((x) >> (20 - PAGE_SHIFT)) /* FIXME: is this right? */
178#define pte_page(x) pfn_to_page(pte_pfn((x)))
179#define pte_pfn(x) ((pte_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181/*
182 * Macro to mark a page protection value as "uncacheable".
183 */
Joe Perches7f944012008-03-23 01:03:11 -0700184#define pgprot_noncached(prot) \
185 (__pgprot(pgprot_val((prot)) | _PAGE_PCD | _PAGE_PWT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187/*
188 * Conversion functions: convert a page and protection to a page entry,
189 * and a page entry and page directory to the page they refer to.
190 */
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192/*
193 * Level 4 access.
194 */
Joe Perches7f944012008-03-23 01:03:11 -0700195#define pgd_page_vaddr(pgd) \
196 ((unsigned long)__va((unsigned long)pgd_val((pgd)) & PTE_MASK))
197#define pgd_page(pgd) (pfn_to_page(pgd_val((pgd)) >> PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
H. Peter Anvine00fc5422008-02-19 16:18:32 +0100199static inline int pgd_large(pgd_t pgd) { return 0; }
Eduardo Habkoste7a9b0b2008-06-25 00:19:05 -0400200#define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202/* PUD - Level3 access */
203/* to find an entry in a page-table-directory. */
Joe Perches7f944012008-03-23 01:03:11 -0700204#define pud_page_vaddr(pud) \
205 ((unsigned long)__va(pud_val((pud)) & PHYSICAL_PAGE_MASK))
206#define pud_page(pud) (pfn_to_page(pud_val((pud)) >> PAGE_SHIFT))
207#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
208#define pud_offset(pgd, address) \
209 ((pud_t *)pgd_page_vaddr(*(pgd)) + pud_index((address)))
210#define pud_present(pud) (pud_val((pud)) & _PAGE_PRESENT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
Andi Kleen61e19a32008-02-04 16:48:09 +0100212static inline int pud_large(pud_t pte)
213{
Joe Perches7f944012008-03-23 01:03:11 -0700214 return (pud_val(pte) & (_PAGE_PSE | _PAGE_PRESENT)) ==
215 (_PAGE_PSE | _PAGE_PRESENT);
Andi Kleen61e19a32008-02-04 16:48:09 +0100216}
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/* PMD - Level 2 access */
Joe Perches7f944012008-03-23 01:03:11 -0700219#define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val((pmd)) & PTE_MASK))
220#define pmd_page(pmd) (pfn_to_page(pmd_val((pmd)) >> PAGE_SHIFT))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Joe Perches7f944012008-03-23 01:03:11 -0700222#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
223#define pmd_offset(dir, address) ((pmd_t *)pud_page_vaddr(*(dir)) + \
224 pmd_index(address))
225#define pmd_none(x) (!pmd_val((x)))
226#define pmd_present(x) (pmd_val((x)) & _PAGE_PRESENT)
227#define pfn_pmd(nr, prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val((prot))))
228#define pmd_pfn(x) ((pmd_val((x)) & __PHYSICAL_MASK) >> PAGE_SHIFT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Joe Perches7f944012008-03-23 01:03:11 -0700230#define pte_to_pgoff(pte) ((pte_val((pte)) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
231#define pgoff_to_pte(off) ((pte_t) { .pte = ((off) << PAGE_SHIFT) | \
232 _PAGE_FILE })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
234
235/* PTE - Level 1 access. */
236
237/* page, protection -> pte */
Joe Perches7f944012008-03-23 01:03:11 -0700238#define mk_pte(page, pgprot) pfn_pte(page_to_pfn((page)), (pgprot))
239
240#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
Dave McCracken46a82b22006-09-25 23:31:48 -0700241#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_vaddr(*(dir)) + \
Joe Perches7f944012008-03-23 01:03:11 -0700242 pte_index((address)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
244/* x86-64 always has all page tables mapped. */
Joe Perches7f944012008-03-23 01:03:11 -0700245#define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
246#define pte_offset_map_nested(dir, address) pte_offset_kernel((dir), (address))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247#define pte_unmap(pte) /* NOP */
Joe Perches7f944012008-03-23 01:03:11 -0700248#define pte_unmap_nested(pte) /* NOP */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
Joe Perches7f944012008-03-23 01:03:11 -0700250#define update_mmu_cache(vma, address, pte) do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Ingo Molnar00d1c5e2008-04-17 17:40:45 +0200252extern int direct_gbpages;
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/* Encode and de-code a swap entry */
255#define __swp_type(x) (((x).val >> 1) & 0x3f)
256#define __swp_offset(x) ((x).val >> 8)
Joe Perches7f944012008-03-23 01:03:11 -0700257#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) | \
258 ((offset) << 8) })
259#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
Jeremy Fitzhardingec8e53932008-01-30 13:32:57 +0100260#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Joe Perches7f944012008-03-23 01:03:11 -0700262extern int kern_addr_valid(unsigned long addr);
Thomas Gleixner31eedd82008-02-15 17:29:12 +0100263extern void cleanup_highmap(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Joe Perches7f944012008-03-23 01:03:11 -0700265#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
266 remap_pfn_range(vma, vaddr, pfn, size, prot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268#define HAVE_ARCH_UNMAPPED_AREA
Jiri Kosinacc503c12008-01-30 13:31:07 +0100269#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271#define pgtable_cache_init() do { } while (0)
Linus Torvaldsda8f1532007-09-21 12:09:41 -0700272#define check_pgt_cache() do { } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274#define PAGE_AGP PAGE_KERNEL_NOCACHE
275#define HAVE_PAGE_AGP 1
276
277/* fs/proc/kcore.c */
278#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
Joe Perches7f944012008-03-23 01:03:11 -0700279#define kc_offset_to_vaddr(o) \
280 (((o) & (1UL << (__VIRTUAL_MASK_SHIFT - 1))) \
281 ? ((o) | ~__VIRTUAL_MASK) \
282 : (o))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284#define __HAVE_ARCH_PTE_SAME
Vivek Goyal9d291e72007-05-02 19:27:06 +0200285#endif /* !__ASSEMBLY__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287#endif /* _X86_64_PGTABLE_H */