Linux kernel mirror (for testing)
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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) 2003 Ralf Baechle
7 */
8#ifndef _ASM_PGTABLE_H
9#define _ASM_PGTABLE_H
10
11#include <linux/config.h>
12#ifdef CONFIG_32BIT
13#include <asm/pgtable-32.h>
14#endif
15#ifdef CONFIG_64BIT
16#include <asm/pgtable-64.h>
17#endif
18
19#include <asm/io.h>
20#include <asm/pgtable-bits.h>
21
22struct mm_struct;
23struct vm_area_struct;
24
25#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
26#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
27 PAGE_CACHABLE_DEFAULT)
28#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
29 PAGE_CACHABLE_DEFAULT)
30#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
31 PAGE_CACHABLE_DEFAULT)
32#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
33 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
34#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
35 PAGE_CACHABLE_DEFAULT)
36#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
37 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
38
39/*
40 * MIPS can't do page protection for execute, and considers that the same like
41 * read. Also, write permissions imply read permissions. This is the closest
42 * we can get by reasonable means..
43 */
44#define __P000 PAGE_NONE
45#define __P001 PAGE_READONLY
46#define __P010 PAGE_COPY
47#define __P011 PAGE_COPY
48#define __P100 PAGE_READONLY
49#define __P101 PAGE_READONLY
50#define __P110 PAGE_COPY
51#define __P111 PAGE_COPY
52
53#define __S000 PAGE_NONE
54#define __S001 PAGE_READONLY
55#define __S010 PAGE_SHARED
56#define __S011 PAGE_SHARED
57#define __S100 PAGE_READONLY
58#define __S101 PAGE_READONLY
59#define __S110 PAGE_SHARED
60#define __S111 PAGE_SHARED
61
62/*
63 * ZERO_PAGE is a global shared page that is always zero; used
64 * for zero-mapped memory areas etc..
65 */
66
67extern unsigned long empty_zero_page;
68extern unsigned long zero_page_mask;
69
70#define ZERO_PAGE(vaddr) \
71 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
72
73#define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
74
75extern void paging_init(void);
76
77/*
78 * Conversion functions: convert a page and protection to a page entry,
79 * and a page entry and page directory to the page they refer to.
80 */
81#define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
82#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
83#define pmd_page_kernel(pmd) pmd_val(pmd)
84
85#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
86#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
87
88#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
89static inline void set_pte(pte_t *ptep, pte_t pte)
90{
91 ptep->pte_high = pte.pte_high;
92 smp_wmb();
93 ptep->pte_low = pte.pte_low;
94 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
95
96 if (pte_val(pte) & _PAGE_GLOBAL) {
97 pte_t *buddy = ptep_buddy(ptep);
98 /*
99 * Make sure the buddy is global too (if it's !none,
100 * it better already be global)
101 */
102 if (pte_none(*buddy))
103 buddy->pte_low |= _PAGE_GLOBAL;
104 }
105}
106#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
107
108static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
109{
110 /* Preserve global status for the pair */
111 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
112 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
113 else
114 set_pte_at(mm, addr, ptep, __pte(0));
115}
116#else
117/*
118 * Certain architectures need to do special things when pte's
119 * within a page table are directly modified. Thus, the following
120 * hook is made available.
121 */
122static inline void set_pte(pte_t *ptep, pte_t pteval)
123{
124 *ptep = pteval;
125#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
126 if (pte_val(pteval) & _PAGE_GLOBAL) {
127 pte_t *buddy = ptep_buddy(ptep);
128 /*
129 * Make sure the buddy is global too (if it's !none,
130 * it better already be global)
131 */
132 if (pte_none(*buddy))
133 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
134 }
135#endif
136}
137#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
138
139static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
140{
141#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
142 /* Preserve global status for the pair */
143 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
144 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
145 else
146#endif
147 set_pte_at(mm, addr, ptep, __pte(0));
148}
149#endif
150
151/*
152 * (pmds are folded into puds so this doesn't get actually called,
153 * but the define is needed for a generic inline function.)
154 */
155#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
156
157#ifdef CONFIG_64BIT
158/*
159 * (puds are folded into pgds so this doesn't get actually called,
160 * but the define is needed for a generic inline function.)
161 */
162#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
163#endif
164
165#define PGD_T_LOG2 ffz(~sizeof(pgd_t))
166#define PMD_T_LOG2 ffz(~sizeof(pmd_t))
167#define PTE_T_LOG2 ffz(~sizeof(pte_t))
168
169extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
170
171/*
172 * The following only work if pte_present() is true.
173 * Undefined behaviour if not..
174 */
175static inline int pte_user(pte_t pte) { BUG(); return 0; }
176#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
177static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
178static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
179static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
180static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
181static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
182static inline pte_t pte_wrprotect(pte_t pte)
183{
184 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
185 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
186 return pte;
187}
188
189static inline pte_t pte_rdprotect(pte_t pte)
190{
191 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
192 (pte).pte_high &= ~_PAGE_SILENT_READ;
193 return pte;
194}
195
196static inline pte_t pte_mkclean(pte_t pte)
197{
198 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
199 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
200 return pte;
201}
202
203static inline pte_t pte_mkold(pte_t pte)
204{
205 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
206 (pte).pte_high &= ~_PAGE_SILENT_READ;
207 return pte;
208}
209
210static inline pte_t pte_mkwrite(pte_t pte)
211{
212 (pte).pte_low |= _PAGE_WRITE;
213 if ((pte).pte_low & _PAGE_MODIFIED) {
214 (pte).pte_low |= _PAGE_SILENT_WRITE;
215 (pte).pte_high |= _PAGE_SILENT_WRITE;
216 }
217 return pte;
218}
219
220static inline pte_t pte_mkread(pte_t pte)
221{
222 (pte).pte_low |= _PAGE_READ;
223 if ((pte).pte_low & _PAGE_ACCESSED) {
224 (pte).pte_low |= _PAGE_SILENT_READ;
225 (pte).pte_high |= _PAGE_SILENT_READ;
226 }
227 return pte;
228}
229
230static inline pte_t pte_mkdirty(pte_t pte)
231{
232 (pte).pte_low |= _PAGE_MODIFIED;
233 if ((pte).pte_low & _PAGE_WRITE) {
234 (pte).pte_low |= _PAGE_SILENT_WRITE;
235 (pte).pte_high |= _PAGE_SILENT_WRITE;
236 }
237 return pte;
238}
239
240static inline pte_t pte_mkyoung(pte_t pte)
241{
242 (pte).pte_low |= _PAGE_ACCESSED;
243 if ((pte).pte_low & _PAGE_READ)
244 (pte).pte_low |= _PAGE_SILENT_READ;
245 (pte).pte_high |= _PAGE_SILENT_READ;
246 return pte;
247}
248#else
249static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
250static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
251static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
252static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
253static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
254
255static inline pte_t pte_wrprotect(pte_t pte)
256{
257 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
258 return pte;
259}
260
261static inline pte_t pte_rdprotect(pte_t pte)
262{
263 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
264 return pte;
265}
266
267static inline pte_t pte_mkclean(pte_t pte)
268{
269 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
270 return pte;
271}
272
273static inline pte_t pte_mkold(pte_t pte)
274{
275 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
276 return pte;
277}
278
279static inline pte_t pte_mkwrite(pte_t pte)
280{
281 pte_val(pte) |= _PAGE_WRITE;
282 if (pte_val(pte) & _PAGE_MODIFIED)
283 pte_val(pte) |= _PAGE_SILENT_WRITE;
284 return pte;
285}
286
287static inline pte_t pte_mkread(pte_t pte)
288{
289 pte_val(pte) |= _PAGE_READ;
290 if (pte_val(pte) & _PAGE_ACCESSED)
291 pte_val(pte) |= _PAGE_SILENT_READ;
292 return pte;
293}
294
295static inline pte_t pte_mkdirty(pte_t pte)
296{
297 pte_val(pte) |= _PAGE_MODIFIED;
298 if (pte_val(pte) & _PAGE_WRITE)
299 pte_val(pte) |= _PAGE_SILENT_WRITE;
300 return pte;
301}
302
303static inline pte_t pte_mkyoung(pte_t pte)
304{
305 pte_val(pte) |= _PAGE_ACCESSED;
306 if (pte_val(pte) & _PAGE_READ)
307 pte_val(pte) |= _PAGE_SILENT_READ;
308 return pte;
309}
310#endif
311
312/*
313 * Macro to make mark a page protection value as "uncacheable". Note
314 * that "protection" is really a misnomer here as the protection value
315 * contains the memory attribute bits, dirty bits, and various other
316 * bits as well.
317 */
318#define pgprot_noncached pgprot_noncached
319
320static inline pgprot_t pgprot_noncached(pgprot_t _prot)
321{
322 unsigned long prot = pgprot_val(_prot);
323
324 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
325
326 return __pgprot(prot);
327}
328
329/*
330 * Conversion functions: convert a page and protection to a page entry,
331 * and a page entry and page directory to the page they refer to.
332 */
333#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
334
335#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
336static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
337{
338 pte.pte_low &= _PAGE_CHG_MASK;
339 pte.pte_low |= pgprot_val(newprot);
340 pte.pte_high |= pgprot_val(newprot) & 0x3f;
341 return pte;
342}
343#else
344static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
345{
346 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
347}
348#endif
349
350
351extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
352 pte_t pte);
353extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
354 pte_t pte);
355
356static inline void update_mmu_cache(struct vm_area_struct *vma,
357 unsigned long address, pte_t pte)
358{
359 __update_tlb(vma, address, pte);
360 __update_cache(vma, address, pte);
361}
362
363#ifndef CONFIG_NEED_MULTIPLE_NODES
364#define kern_addr_valid(addr) (1)
365#endif
366
367#ifdef CONFIG_64BIT_PHYS_ADDR
368extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
369
370static inline int io_remap_pfn_range(struct vm_area_struct *vma,
371 unsigned long vaddr,
372 unsigned long pfn,
373 unsigned long size,
374 pgprot_t prot)
375{
376 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
377 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
378}
379#else
380#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
381 remap_pfn_range(vma, vaddr, pfn, size, prot)
382#endif
383
384#define MK_IOSPACE_PFN(space, pfn) (pfn)
385#define GET_IOSPACE(pfn) 0
386#define GET_PFN(pfn) (pfn)
387
388#include <asm-generic/pgtable.h>
389
390/*
391 * We provide our own get_unmapped area to cope with the virtual aliasing
392 * constraints placed on us by the cache architecture.
393 */
394#define HAVE_ARCH_UNMAPPED_AREA
395
396/*
397 * No page table caches to initialise
398 */
399#define pgtable_cache_init() do { } while (0)
400
401#endif /* _ASM_PGTABLE_H */