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#ifdef CONFIG_32BIT
12#include <asm/pgtable-32.h>
13#endif
14#ifdef CONFIG_64BIT
15#include <asm/pgtable-64.h>
16#endif
17
18#include <asm/io.h>
19#include <asm/pgtable-bits.h>
20
21struct mm_struct;
22struct vm_area_struct;
23
24#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
25#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
26 PAGE_CACHABLE_DEFAULT)
27#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
28 PAGE_CACHABLE_DEFAULT)
29#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
30 PAGE_CACHABLE_DEFAULT)
31#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
32 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
33#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
34 PAGE_CACHABLE_DEFAULT)
35#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
37
38/*
39 * MIPS can't do page protection for execute, and considers that the same like
40 * read. Also, write permissions imply read permissions. This is the closest
41 * we can get by reasonable means..
42 */
43#define __P000 PAGE_NONE
44#define __P001 PAGE_READONLY
45#define __P010 PAGE_COPY
46#define __P011 PAGE_COPY
47#define __P100 PAGE_READONLY
48#define __P101 PAGE_READONLY
49#define __P110 PAGE_COPY
50#define __P111 PAGE_COPY
51
52#define __S000 PAGE_NONE
53#define __S001 PAGE_READONLY
54#define __S010 PAGE_SHARED
55#define __S011 PAGE_SHARED
56#define __S100 PAGE_READONLY
57#define __S101 PAGE_READONLY
58#define __S110 PAGE_SHARED
59#define __S111 PAGE_SHARED
60
61/*
62 * ZERO_PAGE is a global shared page that is always zero; used
63 * for zero-mapped memory areas etc..
64 */
65
66extern unsigned long empty_zero_page;
67extern unsigned long zero_page_mask;
68
69#define ZERO_PAGE(vaddr) \
70 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
71
72extern void paging_init(void);
73
74/*
75 * Conversion functions: convert a page and protection to a page entry,
76 * and a page entry and page directory to the page they refer to.
77 */
78#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
79#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
80#define pmd_page_vaddr(pmd) pmd_val(pmd)
81
82#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
83
84#define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
85#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
86
87static inline void set_pte(pte_t *ptep, pte_t pte)
88{
89 ptep->pte_high = pte.pte_high;
90 smp_wmb();
91 ptep->pte_low = pte.pte_low;
92 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
93
94 if (pte.pte_low & _PAGE_GLOBAL) {
95 pte_t *buddy = ptep_buddy(ptep);
96 /*
97 * Make sure the buddy is global too (if it's !none,
98 * it better already be global)
99 */
100 if (pte_none(*buddy)) {
101 buddy->pte_low |= _PAGE_GLOBAL;
102 buddy->pte_high |= _PAGE_GLOBAL;
103 }
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 pte_t null = __pte(0);
111
112 /* Preserve global status for the pair */
113 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
114 null.pte_low = null.pte_high = _PAGE_GLOBAL;
115
116 set_pte_at(mm, addr, ptep, null);
117}
118#else
119
120#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
121#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
122
123/*
124 * Certain architectures need to do special things when pte's
125 * within a page table are directly modified. Thus, the following
126 * hook is made available.
127 */
128static inline void set_pte(pte_t *ptep, pte_t pteval)
129{
130 *ptep = pteval;
131#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
132 if (pte_val(pteval) & _PAGE_GLOBAL) {
133 pte_t *buddy = ptep_buddy(ptep);
134 /*
135 * Make sure the buddy is global too (if it's !none,
136 * it better already be global)
137 */
138 if (pte_none(*buddy))
139 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
140 }
141#endif
142}
143#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
144
145static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
146{
147#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
148 /* Preserve global status for the pair */
149 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
150 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
151 else
152#endif
153 set_pte_at(mm, addr, ptep, __pte(0));
154}
155#endif
156
157/*
158 * (pmds are folded into puds so this doesn't get actually called,
159 * but the define is needed for a generic inline function.)
160 */
161#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
162
163#ifdef CONFIG_64BIT
164/*
165 * (puds are folded into pgds so this doesn't get actually called,
166 * but the define is needed for a generic inline function.)
167 */
168#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
169#endif
170
171#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
172#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
173#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
174
175/*
176 * We used to declare this array with size but gcc 3.3 and older are not able
177 * to find that this expression is a constant, so the size is dropped.
178 */
179extern pgd_t swapper_pg_dir[];
180
181/*
182 * The following only work if pte_present() is true.
183 * Undefined behaviour if not..
184 */
185#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
186static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
187static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
188static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
189static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
190
191static inline pte_t pte_wrprotect(pte_t pte)
192{
193 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
194 pte.pte_high &= ~_PAGE_SILENT_WRITE;
195 return pte;
196}
197
198static inline pte_t pte_mkclean(pte_t pte)
199{
200 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
201 pte.pte_high &= ~_PAGE_SILENT_WRITE;
202 return pte;
203}
204
205static inline pte_t pte_mkold(pte_t pte)
206{
207 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
208 pte.pte_high &= ~_PAGE_SILENT_READ;
209 return pte;
210}
211
212static inline pte_t pte_mkwrite(pte_t pte)
213{
214 pte.pte_low |= _PAGE_WRITE;
215 if (pte.pte_low & _PAGE_MODIFIED) {
216 pte.pte_low |= _PAGE_SILENT_WRITE;
217 pte.pte_high |= _PAGE_SILENT_WRITE;
218 }
219 return pte;
220}
221
222static inline pte_t pte_mkdirty(pte_t pte)
223{
224 pte.pte_low |= _PAGE_MODIFIED;
225 if (pte.pte_low & _PAGE_WRITE) {
226 pte.pte_low |= _PAGE_SILENT_WRITE;
227 pte.pte_high |= _PAGE_SILENT_WRITE;
228 }
229 return pte;
230}
231
232static inline pte_t pte_mkyoung(pte_t pte)
233{
234 pte.pte_low |= _PAGE_ACCESSED;
235 if (pte.pte_low & _PAGE_READ)
236 pte.pte_low |= _PAGE_SILENT_READ;
237 pte.pte_high |= _PAGE_SILENT_READ;
238 return pte;
239}
240#else
241static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
242static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
243static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
244static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
245
246static inline pte_t pte_wrprotect(pte_t pte)
247{
248 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
249 return pte;
250}
251
252static inline pte_t pte_mkclean(pte_t pte)
253{
254 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
255 return pte;
256}
257
258static inline pte_t pte_mkold(pte_t pte)
259{
260 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
261 return pte;
262}
263
264static inline pte_t pte_mkwrite(pte_t pte)
265{
266 pte_val(pte) |= _PAGE_WRITE;
267 if (pte_val(pte) & _PAGE_MODIFIED)
268 pte_val(pte) |= _PAGE_SILENT_WRITE;
269 return pte;
270}
271
272static inline pte_t pte_mkdirty(pte_t pte)
273{
274 pte_val(pte) |= _PAGE_MODIFIED;
275 if (pte_val(pte) & _PAGE_WRITE)
276 pte_val(pte) |= _PAGE_SILENT_WRITE;
277 return pte;
278}
279
280static inline pte_t pte_mkyoung(pte_t pte)
281{
282 pte_val(pte) |= _PAGE_ACCESSED;
283 if (pte_val(pte) & _PAGE_READ)
284 pte_val(pte) |= _PAGE_SILENT_READ;
285 return pte;
286}
287#endif
288
289/*
290 * Macro to make mark a page protection value as "uncacheable". Note
291 * that "protection" is really a misnomer here as the protection value
292 * contains the memory attribute bits, dirty bits, and various other
293 * bits as well.
294 */
295#define pgprot_noncached pgprot_noncached
296
297static inline pgprot_t pgprot_noncached(pgprot_t _prot)
298{
299 unsigned long prot = pgprot_val(_prot);
300
301 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
302
303 return __pgprot(prot);
304}
305
306/*
307 * Conversion functions: convert a page and protection to a page entry,
308 * and a page entry and page directory to the page they refer to.
309 */
310#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
311
312#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
313static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
314{
315 pte.pte_low &= _PAGE_CHG_MASK;
316 pte.pte_high &= ~0x3f;
317 pte.pte_low |= pgprot_val(newprot);
318 pte.pte_high |= pgprot_val(newprot) & 0x3f;
319 return pte;
320}
321#else
322static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
323{
324 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
325}
326#endif
327
328
329extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
330 pte_t pte);
331extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
332 pte_t pte);
333
334static inline void update_mmu_cache(struct vm_area_struct *vma,
335 unsigned long address, pte_t pte)
336{
337 __update_tlb(vma, address, pte);
338 __update_cache(vma, address, pte);
339}
340
341#define kern_addr_valid(addr) (1)
342
343#ifdef CONFIG_64BIT_PHYS_ADDR
344extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
345
346static inline int io_remap_pfn_range(struct vm_area_struct *vma,
347 unsigned long vaddr,
348 unsigned long pfn,
349 unsigned long size,
350 pgprot_t prot)
351{
352 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
353 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
354}
355#else
356#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
357 remap_pfn_range(vma, vaddr, pfn, size, prot)
358#endif
359
360#include <asm-generic/pgtable.h>
361
362/*
363 * We provide our own get_unmapped area to cope with the virtual aliasing
364 * constraints placed on us by the cache architecture.
365 */
366#define HAVE_ARCH_UNMAPPED_AREA
367
368/*
369 * No page table caches to initialise
370 */
371#define pgtable_cache_init() do { } while (0)
372
373#endif /* _ASM_PGTABLE_H */