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 <asm-generic/4level-fixup.h>
12
13#include <linux/config.h>
14#ifdef CONFIG_32BIT
15#include <asm/pgtable-32.h>
16#endif
17#ifdef CONFIG_64BIT
18#include <asm/pgtable-64.h>
19#endif
20
21#include <asm/pgtable-bits.h>
22
23#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
24#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
25 PAGE_CACHABLE_DEFAULT)
26#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
27 PAGE_CACHABLE_DEFAULT)
28#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | \
29 PAGE_CACHABLE_DEFAULT)
30#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
31 _PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
32#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
33 PAGE_CACHABLE_DEFAULT)
34#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
35 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
36
37/*
38 * MIPS can't do page protection for execute, and considers that the same like
39 * read. Also, write permissions imply read permissions. This is the closest
40 * we can get by reasonable means..
41 */
42#define __P000 PAGE_NONE
43#define __P001 PAGE_READONLY
44#define __P010 PAGE_COPY
45#define __P011 PAGE_COPY
46#define __P100 PAGE_READONLY
47#define __P101 PAGE_READONLY
48#define __P110 PAGE_COPY
49#define __P111 PAGE_COPY
50
51#define __S000 PAGE_NONE
52#define __S001 PAGE_READONLY
53#define __S010 PAGE_SHARED
54#define __S011 PAGE_SHARED
55#define __S100 PAGE_READONLY
56#define __S101 PAGE_READONLY
57#define __S110 PAGE_SHARED
58#define __S111 PAGE_SHARED
59
60/*
61 * ZERO_PAGE is a global shared page that is always zero; used
62 * for zero-mapped memory areas etc..
63 */
64
65extern unsigned long empty_zero_page;
66extern unsigned long zero_page_mask;
67
68#define ZERO_PAGE(vaddr) \
69 (virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
70
71extern void paging_init(void);
72
73/*
74 * Conversion functions: convert a page and protection to a page entry,
75 * and a page entry and page directory to the page they refer to.
76 */
77#define page_pte(page) page_pte_prot(page, __pgprot(0))
78#define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
79#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
80#define pmd_page_kernel(pmd) pmd_val(pmd)
81
82#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
83#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
84
85#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
86static inline void set_pte(pte_t *ptep, pte_t pte)
87{
88 ptep->pte_high = pte.pte_high;
89 smp_wmb();
90 ptep->pte_low = pte.pte_low;
91 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
92
93 if (pte_val(pte) & _PAGE_GLOBAL) {
94 pte_t *buddy = ptep_buddy(ptep);
95 /*
96 * Make sure the buddy is global too (if it's !none,
97 * it better already be global)
98 */
99 if (pte_none(*buddy))
100 buddy->pte_low |= _PAGE_GLOBAL;
101 }
102}
103#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
104
105static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
106{
107 /* Preserve global status for the pair */
108 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
109 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
110 else
111 set_pte_at(mm, addr, ptep, __pte(0));
112}
113#else
114/*
115 * Certain architectures need to do special things when pte's
116 * within a page table are directly modified. Thus, the following
117 * hook is made available.
118 */
119static inline void set_pte(pte_t *ptep, pte_t pteval)
120{
121 *ptep = pteval;
122#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
123 if (pte_val(pteval) & _PAGE_GLOBAL) {
124 pte_t *buddy = ptep_buddy(ptep);
125 /*
126 * Make sure the buddy is global too (if it's !none,
127 * it better already be global)
128 */
129 if (pte_none(*buddy))
130 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
131 }
132#endif
133}
134#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
135
136static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
137{
138#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
139 /* Preserve global status for the pair */
140 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
141 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
142 else
143#endif
144 set_pte_at(mm, addr, ptep, __pte(0));
145}
146#endif
147
148/*
149 * (pmds are folded into pgds so this doesn't get actually called,
150 * but the define is needed for a generic inline function.)
151 */
152#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
153#define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
154
155#define PGD_T_LOG2 ffz(~sizeof(pgd_t))
156#define PMD_T_LOG2 ffz(~sizeof(pmd_t))
157#define PTE_T_LOG2 ffz(~sizeof(pte_t))
158
159extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
160
161/*
162 * The following only work if pte_present() is true.
163 * Undefined behaviour if not..
164 */
165static inline int pte_user(pte_t pte) { BUG(); return 0; }
166#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
167static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
168static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
169static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
170static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
171static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
172static inline pte_t pte_wrprotect(pte_t pte)
173{
174 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
175 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
176 return pte;
177}
178
179static inline pte_t pte_rdprotect(pte_t pte)
180{
181 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
182 (pte).pte_high &= ~_PAGE_SILENT_READ;
183 return pte;
184}
185
186static inline pte_t pte_mkclean(pte_t pte)
187{
188 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
189 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
190 return pte;
191}
192
193static inline pte_t pte_mkold(pte_t pte)
194{
195 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
196 (pte).pte_high &= ~_PAGE_SILENT_READ;
197 return pte;
198}
199
200static inline pte_t pte_mkwrite(pte_t pte)
201{
202 (pte).pte_low |= _PAGE_WRITE;
203 if ((pte).pte_low & _PAGE_MODIFIED) {
204 (pte).pte_low |= _PAGE_SILENT_WRITE;
205 (pte).pte_high |= _PAGE_SILENT_WRITE;
206 }
207 return pte;
208}
209
210static inline pte_t pte_mkread(pte_t pte)
211{
212 (pte).pte_low |= _PAGE_READ;
213 if ((pte).pte_low & _PAGE_ACCESSED) {
214 (pte).pte_low |= _PAGE_SILENT_READ;
215 (pte).pte_high |= _PAGE_SILENT_READ;
216 }
217 return pte;
218}
219
220static inline pte_t pte_mkdirty(pte_t pte)
221{
222 (pte).pte_low |= _PAGE_MODIFIED;
223 if ((pte).pte_low & _PAGE_WRITE) {
224 (pte).pte_low |= _PAGE_SILENT_WRITE;
225 (pte).pte_high |= _PAGE_SILENT_WRITE;
226 }
227 return pte;
228}
229
230static inline pte_t pte_mkyoung(pte_t pte)
231{
232 (pte).pte_low |= _PAGE_ACCESSED;
233 if ((pte).pte_low & _PAGE_READ)
234 (pte).pte_low |= _PAGE_SILENT_READ;
235 (pte).pte_high |= _PAGE_SILENT_READ;
236 return pte;
237}
238#else
239static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
240static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
241static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
242static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
243static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
244
245static inline pte_t pte_wrprotect(pte_t pte)
246{
247 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
248 return pte;
249}
250
251static inline pte_t pte_rdprotect(pte_t pte)
252{
253 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
254 return pte;
255}
256
257static inline pte_t pte_mkclean(pte_t pte)
258{
259 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
260 return pte;
261}
262
263static inline pte_t pte_mkold(pte_t pte)
264{
265 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
266 return pte;
267}
268
269static inline pte_t pte_mkwrite(pte_t pte)
270{
271 pte_val(pte) |= _PAGE_WRITE;
272 if (pte_val(pte) & _PAGE_MODIFIED)
273 pte_val(pte) |= _PAGE_SILENT_WRITE;
274 return pte;
275}
276
277static inline pte_t pte_mkread(pte_t pte)
278{
279 pte_val(pte) |= _PAGE_READ;
280 if (pte_val(pte) & _PAGE_ACCESSED)
281 pte_val(pte) |= _PAGE_SILENT_READ;
282 return pte;
283}
284
285static inline pte_t pte_mkdirty(pte_t pte)
286{
287 pte_val(pte) |= _PAGE_MODIFIED;
288 if (pte_val(pte) & _PAGE_WRITE)
289 pte_val(pte) |= _PAGE_SILENT_WRITE;
290 return pte;
291}
292
293static inline pte_t pte_mkyoung(pte_t pte)
294{
295 pte_val(pte) |= _PAGE_ACCESSED;
296 if (pte_val(pte) & _PAGE_READ)
297 pte_val(pte) |= _PAGE_SILENT_READ;
298 return pte;
299}
300#endif
301
302/*
303 * Macro to make mark a page protection value as "uncacheable". Note
304 * that "protection" is really a misnomer here as the protection value
305 * contains the memory attribute bits, dirty bits, and various other
306 * bits as well.
307 */
308#define pgprot_noncached pgprot_noncached
309
310static inline pgprot_t pgprot_noncached(pgprot_t _prot)
311{
312 unsigned long prot = pgprot_val(_prot);
313
314 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
315
316 return __pgprot(prot);
317}
318
319/*
320 * Conversion functions: convert a page and protection to a page entry,
321 * and a page entry and page directory to the page they refer to.
322 */
323#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
324
325#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
326static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
327{
328 pte.pte_low &= _PAGE_CHG_MASK;
329 pte.pte_low |= pgprot_val(newprot);
330 pte.pte_high |= pgprot_val(newprot) & 0x3f;
331 return pte;
332}
333#else
334static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
335{
336 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
337}
338#endif
339
340
341extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
342 pte_t pte);
343extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
344 pte_t pte);
345
346static inline void update_mmu_cache(struct vm_area_struct *vma,
347 unsigned long address, pte_t pte)
348{
349 __update_tlb(vma, address, pte);
350 __update_cache(vma, address, pte);
351}
352
353#ifndef CONFIG_NEED_MULTIPLE_NODES
354#define kern_addr_valid(addr) (1)
355#endif
356
357#ifdef CONFIG_64BIT_PHYS_ADDR
358extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
359extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
360
361static inline int io_remap_pfn_range(struct vm_area_struct *vma,
362 unsigned long vaddr,
363 unsigned long pfn,
364 unsigned long size,
365 pgprot_t prot)
366{
367 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
368 return remap_pfn_range(vma, vaddr, pfn, size, prot);
369}
370#else
371#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
372 remap_pfn_range(vma, vaddr, pfn, size, prot)
373#endif
374
375#define MK_IOSPACE_PFN(space, pfn) (pfn)
376#define GET_IOSPACE(pfn) 0
377#define GET_PFN(pfn) (pfn)
378
379#include <asm-generic/pgtable.h>
380
381/*
382 * We provide our own get_unmapped area to cope with the virtual aliasing
383 * constraints placed on us by the cache architecture.
384 */
385#define HAVE_ARCH_UNMAPPED_AREA
386
387/*
388 * No page table caches to initialise
389 */
390#define pgtable_cache_init() do { } while (0)
391
392#endif /* _ASM_PGTABLE_H */