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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PGTABLE_64_H
10#define _ASM_PGTABLE_64_H
11
12#include <linux/compiler.h>
13#include <linux/linkage.h>
14
15#include <asm/addrspace.h>
16#include <asm/page.h>
17#include <asm/cachectl.h>
18#include <asm/fixmap.h>
19
20#if CONFIG_PGTABLE_LEVELS == 2
21#include <asm-generic/pgtable-nopmd.h>
22#elif CONFIG_PGTABLE_LEVELS == 3
23#include <asm-generic/pgtable-nopud.h>
24#else
25#include <asm-generic/pgtable-nop4d.h>
26#endif
27
28/*
29 * Each address space has 2 4K pages as its page directory, giving 1024
30 * (== PTRS_PER_PGD) 8 byte pointers to pmd tables. Each pmd table is a
31 * single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page
32 * tables. Each page table is also a single 4K page, giving 512 (==
33 * PTRS_PER_PTE) 8 byte ptes. Each pud entry is initialized to point to
34 * invalid_pmd_table, each pmd entry is initialized to point to
35 * invalid_pte_table, each pte is initialized to 0.
36 *
37 * Kernel mappings: kernel mappings are held in the swapper_pg_table.
38 * The layout is identical to userspace except it's indexed with the
39 * fault address - VMALLOC_START.
40 */
41
42
43/* PGDIR_SHIFT determines what a third-level page table entry can map */
44#ifdef __PAGETABLE_PMD_FOLDED
45#define PGDIR_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
46#else
47
48/* PMD_SHIFT determines the size of the area a second-level page table can map */
49#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT - 3))
50#define PMD_SIZE (1UL << PMD_SHIFT)
51#define PMD_MASK (~(PMD_SIZE-1))
52
53# ifdef __PAGETABLE_PUD_FOLDED
54# define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_TABLE_ORDER - 3))
55# endif
56#endif
57
58#ifndef __PAGETABLE_PUD_FOLDED
59#define PUD_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_TABLE_ORDER - 3))
60#define PUD_SIZE (1UL << PUD_SHIFT)
61#define PUD_MASK (~(PUD_SIZE-1))
62#define PGDIR_SHIFT (PUD_SHIFT + (PAGE_SHIFT + PUD_TABLE_ORDER - 3))
63#endif
64
65#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
66#define PGDIR_MASK (~(PGDIR_SIZE-1))
67
68/*
69 * For 4kB page size we use a 3 level page tree and an 8kB pud, which
70 * permits us mapping 40 bits of virtual address space.
71 *
72 * We used to implement 41 bits by having an order 1 pmd level but that seemed
73 * rather pointless.
74 *
75 * For 8kB page size we use a 3 level page tree which permits a total of
76 * 8TB of address space. Alternatively a 33-bit / 8GB organization using
77 * two levels would be easy to implement.
78 *
79 * For 16kB page size we use a 2 level page tree which permits a total of
80 * 36 bits of virtual address space. We could add a third level but it seems
81 * like at the moment there's no need for this.
82 *
83 * For 64kB page size we use a 2 level page table tree for a total of 42 bits
84 * of virtual address space.
85 */
86#ifdef CONFIG_PAGE_SIZE_4KB
87# ifdef CONFIG_MIPS_VA_BITS_48
88# define PGD_TABLE_ORDER 0
89# define PUD_TABLE_ORDER 0
90# else
91# define PGD_TABLE_ORDER 1
92# define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
93# endif
94#define PMD_TABLE_ORDER 0
95#endif
96#ifdef CONFIG_PAGE_SIZE_8KB
97#define PGD_TABLE_ORDER 0
98#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
99#define PMD_TABLE_ORDER 0
100#endif
101#ifdef CONFIG_PAGE_SIZE_16KB
102#ifdef CONFIG_MIPS_VA_BITS_48
103#define PGD_TABLE_ORDER 1
104#else
105#define PGD_TABLE_ORDER 0
106#endif
107#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
108#define PMD_TABLE_ORDER 0
109#endif
110#ifdef CONFIG_PAGE_SIZE_32KB
111#define PGD_TABLE_ORDER 0
112#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
113#define PMD_TABLE_ORDER 0
114#endif
115#ifdef CONFIG_PAGE_SIZE_64KB
116#define PGD_TABLE_ORDER 0
117#define PUD_TABLE_ORDER aieeee_attempt_to_allocate_pud
118#ifdef CONFIG_MIPS_VA_BITS_48
119#define PMD_TABLE_ORDER 0
120#else
121#define PMD_TABLE_ORDER aieeee_attempt_to_allocate_pmd
122#endif
123#endif
124
125#define PTRS_PER_PGD ((PAGE_SIZE << PGD_TABLE_ORDER) / sizeof(pgd_t))
126#ifndef __PAGETABLE_PUD_FOLDED
127#define PTRS_PER_PUD ((PAGE_SIZE << PUD_TABLE_ORDER) / sizeof(pud_t))
128#endif
129#ifndef __PAGETABLE_PMD_FOLDED
130#define PTRS_PER_PMD ((PAGE_SIZE << PMD_TABLE_ORDER) / sizeof(pmd_t))
131#endif
132#define PTRS_PER_PTE (PAGE_SIZE / sizeof(pte_t))
133
134#define USER_PTRS_PER_PGD ((TASK_SIZE64 / PGDIR_SIZE)?(TASK_SIZE64 / PGDIR_SIZE):1)
135
136/*
137 * TLB refill handlers also map the vmalloc area into xuseg. Avoid
138 * the first couple of pages so NULL pointer dereferences will still
139 * reliably trap.
140 */
141#define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE))
142#define VMALLOC_END \
143 (MAP_BASE + \
144 min(PTRS_PER_PGD * PTRS_PER_PUD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \
145 (1UL << cpu_vmbits)) - (1UL << 32))
146
147#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \
148 VMALLOC_START != CKSSEG
149/* Load modules into 32bit-compatible segment. */
150#define MODULE_START CKSSEG
151#define MODULE_END (FIXADDR_START-2*PAGE_SIZE)
152#endif
153
154#define pte_ERROR(e) \
155 printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
156#ifndef __PAGETABLE_PMD_FOLDED
157#define pmd_ERROR(e) \
158 printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
159#endif
160#ifndef __PAGETABLE_PUD_FOLDED
161#define pud_ERROR(e) \
162 printk("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
163#endif
164#define pgd_ERROR(e) \
165 printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
166
167extern pte_t invalid_pte_table[PTRS_PER_PTE];
168
169#ifndef __PAGETABLE_PUD_FOLDED
170/*
171 * For 4-level pagetables we defines these ourselves, for 3-level the
172 * definitions are below, for 2-level the
173 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
174 */
175typedef struct { unsigned long pud; } pud_t;
176#define pud_val(x) ((x).pud)
177#define __pud(x) ((pud_t) { (x) })
178
179extern pud_t invalid_pud_table[PTRS_PER_PUD];
180
181/*
182 * Empty pgd entries point to the invalid_pud_table.
183 */
184static inline int p4d_none(p4d_t p4d)
185{
186 return p4d_val(p4d) == (unsigned long)invalid_pud_table;
187}
188
189static inline int p4d_bad(p4d_t p4d)
190{
191 if (unlikely(p4d_val(p4d) & ~PAGE_MASK))
192 return 1;
193
194 return 0;
195}
196
197static inline int p4d_present(p4d_t p4d)
198{
199 return p4d_val(p4d) != (unsigned long)invalid_pud_table;
200}
201
202static inline void p4d_clear(p4d_t *p4dp)
203{
204 p4d_val(*p4dp) = (unsigned long)invalid_pud_table;
205}
206
207static inline pud_t *p4d_pgtable(p4d_t p4d)
208{
209 return (pud_t *)p4d_val(p4d);
210}
211
212#define p4d_phys(p4d) virt_to_phys((void *)p4d_val(p4d))
213#define p4d_page(p4d) (pfn_to_page(p4d_phys(p4d) >> PAGE_SHIFT))
214
215#define p4d_index(address) (((address) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
216
217static inline void set_p4d(p4d_t *p4d, p4d_t p4dval)
218{
219 *p4d = p4dval;
220}
221
222#endif
223
224#ifndef __PAGETABLE_PMD_FOLDED
225/*
226 * For 3-level pagetables we defines these ourselves, for 2-level the
227 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
228 */
229typedef struct { unsigned long pmd; } pmd_t;
230#define pmd_val(x) ((x).pmd)
231#define __pmd(x) ((pmd_t) { (x) } )
232
233
234extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
235#endif
236
237/*
238 * Empty pgd/pmd entries point to the invalid_pte_table.
239 */
240static inline int pmd_none(pmd_t pmd)
241{
242 return pmd_val(pmd) == (unsigned long) invalid_pte_table;
243}
244
245static inline int pmd_bad(pmd_t pmd)
246{
247#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
248 /* pmd_huge(pmd) but inline */
249 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
250 return 0;
251#endif
252
253 if (unlikely(pmd_val(pmd) & ~PAGE_MASK))
254 return 1;
255
256 return 0;
257}
258
259static inline int pmd_present(pmd_t pmd)
260{
261#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
262 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
263 return pmd_val(pmd) & _PAGE_PRESENT;
264#endif
265
266 return pmd_val(pmd) != (unsigned long) invalid_pte_table;
267}
268
269static inline void pmd_clear(pmd_t *pmdp)
270{
271 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
272}
273#ifndef __PAGETABLE_PMD_FOLDED
274
275/*
276 * Empty pud entries point to the invalid_pmd_table.
277 */
278static inline int pud_none(pud_t pud)
279{
280 return pud_val(pud) == (unsigned long) invalid_pmd_table;
281}
282
283static inline int pud_bad(pud_t pud)
284{
285 return pud_val(pud) & ~PAGE_MASK;
286}
287
288static inline int pud_present(pud_t pud)
289{
290 return pud_val(pud) != (unsigned long) invalid_pmd_table;
291}
292
293static inline void pud_clear(pud_t *pudp)
294{
295 pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
296}
297#endif
298
299#define pte_page(x) pfn_to_page(pte_pfn(x))
300
301#define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT))
302#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
303#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
304
305#ifndef __PAGETABLE_PMD_FOLDED
306static inline pmd_t *pud_pgtable(pud_t pud)
307{
308 return (pmd_t *)pud_val(pud);
309}
310#define pud_phys(pud) virt_to_phys((void *)pud_val(pud))
311#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
312
313#endif
314
315/*
316 * Initialize a new pgd / pud / pmd table with invalid pointers.
317 */
318extern void pgd_init(void *addr);
319extern void pud_init(void *addr);
320extern void pmd_init(void *addr);
321
322/*
323 * Non-present pages: high 40 bits are offset, next 8 bits type,
324 * low 16 bits zero.
325 */
326static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
327{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; }
328
329#define __swp_type(x) (((x).val >> 16) & 0xff)
330#define __swp_offset(x) ((x).val >> 24)
331#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
332#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
333#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
334
335#endif /* _ASM_PGTABLE_64_H */
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 2003 Ralf Baechle
7 * Copyright (C) 1999, 2000, 2001 Silicon Graphics, Inc.
8 */
9#ifndef _ASM_PGTABLE_64_H
10#define _ASM_PGTABLE_64_H
11
12#include <linux/compiler.h>
13#include <linux/linkage.h>
14
15#include <asm/addrspace.h>
16#include <asm/page.h>
17#include <asm/cachectl.h>
18#include <asm/fixmap.h>
19
20#ifdef CONFIG_PAGE_SIZE_64KB
21#include <asm-generic/pgtable-nopmd.h>
22#else
23#include <asm-generic/pgtable-nopud.h>
24#endif
25
26/*
27 * Each address space has 2 4K pages as its page directory, giving 1024
28 * (== PTRS_PER_PGD) 8 byte pointers to pmd tables. Each pmd table is a
29 * single 4K page, giving 512 (== PTRS_PER_PMD) 8 byte pointers to page
30 * tables. Each page table is also a single 4K page, giving 512 (==
31 * PTRS_PER_PTE) 8 byte ptes. Each pud entry is initialized to point to
32 * invalid_pmd_table, each pmd entry is initialized to point to
33 * invalid_pte_table, each pte is initialized to 0. When memory is low,
34 * and a pmd table or a page table allocation fails, empty_bad_pmd_table
35 * and empty_bad_page_table is returned back to higher layer code, so
36 * that the failure is recognized later on. Linux does not seem to
37 * handle these failures very well though. The empty_bad_page_table has
38 * invalid pte entries in it, to force page faults.
39 *
40 * Kernel mappings: kernel mappings are held in the swapper_pg_table.
41 * The layout is identical to userspace except it's indexed with the
42 * fault address - VMALLOC_START.
43 */
44
45
46/* PGDIR_SHIFT determines what a third-level page table entry can map */
47#ifdef __PAGETABLE_PMD_FOLDED
48#define PGDIR_SHIFT (PAGE_SHIFT + PAGE_SHIFT + PTE_ORDER - 3)
49#else
50
51/* PMD_SHIFT determines the size of the area a second-level page table can map */
52#define PMD_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
53#define PMD_SIZE (1UL << PMD_SHIFT)
54#define PMD_MASK (~(PMD_SIZE-1))
55
56
57#define PGDIR_SHIFT (PMD_SHIFT + (PAGE_SHIFT + PMD_ORDER - 3))
58#endif
59#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
60#define PGDIR_MASK (~(PGDIR_SIZE-1))
61
62/*
63 * For 4kB page size we use a 3 level page tree and an 8kB pud, which
64 * permits us mapping 40 bits of virtual address space.
65 *
66 * We used to implement 41 bits by having an order 1 pmd level but that seemed
67 * rather pointless.
68 *
69 * For 8kB page size we use a 3 level page tree which permits a total of
70 * 8TB of address space. Alternatively a 33-bit / 8GB organization using
71 * two levels would be easy to implement.
72 *
73 * For 16kB page size we use a 2 level page tree which permits a total of
74 * 36 bits of virtual address space. We could add a third level but it seems
75 * like at the moment there's no need for this.
76 *
77 * For 64kB page size we use a 2 level page table tree for a total of 42 bits
78 * of virtual address space.
79 */
80#ifdef CONFIG_PAGE_SIZE_4KB
81#define PGD_ORDER 1
82#define PUD_ORDER aieeee_attempt_to_allocate_pud
83#define PMD_ORDER 0
84#define PTE_ORDER 0
85#endif
86#ifdef CONFIG_PAGE_SIZE_8KB
87#define PGD_ORDER 0
88#define PUD_ORDER aieeee_attempt_to_allocate_pud
89#define PMD_ORDER 0
90#define PTE_ORDER 0
91#endif
92#ifdef CONFIG_PAGE_SIZE_16KB
93#define PGD_ORDER 0
94#define PUD_ORDER aieeee_attempt_to_allocate_pud
95#define PMD_ORDER 0
96#define PTE_ORDER 0
97#endif
98#ifdef CONFIG_PAGE_SIZE_32KB
99#define PGD_ORDER 0
100#define PUD_ORDER aieeee_attempt_to_allocate_pud
101#define PMD_ORDER 0
102#define PTE_ORDER 0
103#endif
104#ifdef CONFIG_PAGE_SIZE_64KB
105#define PGD_ORDER 0
106#define PUD_ORDER aieeee_attempt_to_allocate_pud
107#define PMD_ORDER aieeee_attempt_to_allocate_pmd
108#define PTE_ORDER 0
109#endif
110
111#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
112#ifndef __PAGETABLE_PMD_FOLDED
113#define PTRS_PER_PMD ((PAGE_SIZE << PMD_ORDER) / sizeof(pmd_t))
114#endif
115#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
116
117#if PGDIR_SIZE >= TASK_SIZE64
118#define USER_PTRS_PER_PGD (1)
119#else
120#define USER_PTRS_PER_PGD (TASK_SIZE64 / PGDIR_SIZE)
121#endif
122#define FIRST_USER_ADDRESS 0UL
123
124/*
125 * TLB refill handlers also map the vmalloc area into xuseg. Avoid
126 * the first couple of pages so NULL pointer dereferences will still
127 * reliably trap.
128 */
129#define VMALLOC_START (MAP_BASE + (2 * PAGE_SIZE))
130#define VMALLOC_END \
131 (MAP_BASE + \
132 min(PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \
133 (1UL << cpu_vmbits)) - (1UL << 32))
134
135#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \
136 VMALLOC_START != CKSSEG
137/* Load modules into 32bit-compatible segment. */
138#define MODULE_START CKSSEG
139#define MODULE_END (FIXADDR_START-2*PAGE_SIZE)
140#endif
141
142#define pte_ERROR(e) \
143 printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
144#ifndef __PAGETABLE_PMD_FOLDED
145#define pmd_ERROR(e) \
146 printk("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
147#endif
148#define pgd_ERROR(e) \
149 printk("%s:%d: bad pgd %016lx.\n", __FILE__, __LINE__, pgd_val(e))
150
151extern pte_t invalid_pte_table[PTRS_PER_PTE];
152extern pte_t empty_bad_page_table[PTRS_PER_PTE];
153
154
155#ifndef __PAGETABLE_PMD_FOLDED
156/*
157 * For 3-level pagetables we defines these ourselves, for 2-level the
158 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
159 */
160typedef struct { unsigned long pmd; } pmd_t;
161#define pmd_val(x) ((x).pmd)
162#define __pmd(x) ((pmd_t) { (x) } )
163
164
165extern pmd_t invalid_pmd_table[PTRS_PER_PMD];
166#endif
167
168/*
169 * Empty pgd/pmd entries point to the invalid_pte_table.
170 */
171static inline int pmd_none(pmd_t pmd)
172{
173 return pmd_val(pmd) == (unsigned long) invalid_pte_table;
174}
175
176static inline int pmd_bad(pmd_t pmd)
177{
178#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
179 /* pmd_huge(pmd) but inline */
180 if (unlikely(pmd_val(pmd) & _PAGE_HUGE))
181 return 0;
182#endif
183
184 if (unlikely(pmd_val(pmd) & ~PAGE_MASK))
185 return 1;
186
187 return 0;
188}
189
190static inline int pmd_present(pmd_t pmd)
191{
192 return pmd_val(pmd) != (unsigned long) invalid_pte_table;
193}
194
195static inline void pmd_clear(pmd_t *pmdp)
196{
197 pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
198}
199#ifndef __PAGETABLE_PMD_FOLDED
200
201/*
202 * Empty pud entries point to the invalid_pmd_table.
203 */
204static inline int pud_none(pud_t pud)
205{
206 return pud_val(pud) == (unsigned long) invalid_pmd_table;
207}
208
209static inline int pud_bad(pud_t pud)
210{
211 return pud_val(pud) & ~PAGE_MASK;
212}
213
214static inline int pud_present(pud_t pud)
215{
216 return pud_val(pud) != (unsigned long) invalid_pmd_table;
217}
218
219static inline void pud_clear(pud_t *pudp)
220{
221 pud_val(*pudp) = ((unsigned long) invalid_pmd_table);
222}
223#endif
224
225#define pte_page(x) pfn_to_page(pte_pfn(x))
226
227#ifdef CONFIG_CPU_VR41XX
228#define pte_pfn(x) ((unsigned long)((x).pte >> (PAGE_SHIFT + 2)))
229#define pfn_pte(pfn, prot) __pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
230#else
231#define pte_pfn(x) ((unsigned long)((x).pte >> _PFN_SHIFT))
232#define pfn_pte(pfn, prot) __pte(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
233#define pfn_pmd(pfn, prot) __pmd(((pfn) << _PFN_SHIFT) | pgprot_val(prot))
234#endif
235
236#define __pgd_offset(address) pgd_index(address)
237#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
238#define __pmd_offset(address) pmd_index(address)
239
240/* to find an entry in a kernel page-table-directory */
241#define pgd_offset_k(address) pgd_offset(&init_mm, address)
242
243#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
244#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
245
246/* to find an entry in a page-table-directory */
247#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
248
249#ifndef __PAGETABLE_PMD_FOLDED
250static inline unsigned long pud_page_vaddr(pud_t pud)
251{
252 return pud_val(pud);
253}
254#define pud_phys(pud) virt_to_phys((void *)pud_val(pud))
255#define pud_page(pud) (pfn_to_page(pud_phys(pud) >> PAGE_SHIFT))
256
257/* Find an entry in the second-level page table.. */
258static inline pmd_t *pmd_offset(pud_t * pud, unsigned long address)
259{
260 return (pmd_t *) pud_page_vaddr(*pud) + pmd_index(address);
261}
262#endif
263
264/* Find an entry in the third-level page table.. */
265#define __pte_offset(address) \
266 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
267#define pte_offset(dir, address) \
268 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
269#define pte_offset_kernel(dir, address) \
270 ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
271#define pte_offset_map(dir, address) \
272 ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
273#define pte_unmap(pte) ((void)(pte))
274
275/*
276 * Initialize a new pgd / pmd table with invalid pointers.
277 */
278extern void pgd_init(unsigned long page);
279extern void pmd_init(unsigned long page, unsigned long pagetable);
280
281/*
282 * Non-present pages: high 24 bits are offset, next 8 bits type,
283 * low 32 bits zero.
284 */
285static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset)
286{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; }
287
288#define __swp_type(x) (((x).val >> 32) & 0xff)
289#define __swp_offset(x) ((x).val >> 40)
290#define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) })
291#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
292#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
293
294/*
295 * Bits 0, 4, 6, and 7 are taken. Let's leave bits 1, 2, 3, and 5 alone to
296 * make things easier, and only use the upper 56 bits for the page offset...
297 */
298#define PTE_FILE_MAX_BITS 56
299
300#define pte_to_pgoff(_pte) ((_pte).pte >> 8)
301#define pgoff_to_pte(off) ((pte_t) { ((off) << 8) | _PAGE_FILE })
302
303#endif /* _ASM_PGTABLE_64_H */