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Linux kernel mirror (for testing)
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linux
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
71#define __HAVE_ARCH_MULTIPLE_ZERO_PAGE
72
73extern void paging_init(void);
74
75/*
76 * Conversion functions: convert a page and protection to a page entry,
77 * and a page entry and page directory to the page they refer to.
78 */
79#define page_pte(page) page_pte_prot(page, __pgprot(0))
80#define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
81#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
82#define pmd_page_kernel(pmd) pmd_val(pmd)
83
84#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
85#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
86
87#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
88static inline void set_pte(pte_t *ptep, pte_t pte)
89{
90 ptep->pte_high = pte.pte_high;
91 smp_wmb();
92 ptep->pte_low = pte.pte_low;
93 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
94
95 if (pte_val(pte) & _PAGE_GLOBAL) {
96 pte_t *buddy = ptep_buddy(ptep);
97 /*
98 * Make sure the buddy is global too (if it's !none,
99 * it better already be global)
100 */
101 if (pte_none(*buddy))
102 buddy->pte_low |= _PAGE_GLOBAL;
103 }
104}
105#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
106
107static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
108{
109 /* Preserve global status for the pair */
110 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
111 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
112 else
113 set_pte_at(mm, addr, ptep, __pte(0));
114}
115#else
116/*
117 * Certain architectures need to do special things when pte's
118 * within a page table are directly modified. Thus, the following
119 * hook is made available.
120 */
121static inline void set_pte(pte_t *ptep, pte_t pteval)
122{
123 *ptep = pteval;
124#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
125 if (pte_val(pteval) & _PAGE_GLOBAL) {
126 pte_t *buddy = ptep_buddy(ptep);
127 /*
128 * Make sure the buddy is global too (if it's !none,
129 * it better already be global)
130 */
131 if (pte_none(*buddy))
132 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
133 }
134#endif
135}
136#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
137
138static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
139{
140#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
141 /* Preserve global status for the pair */
142 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
143 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
144 else
145#endif
146 set_pte_at(mm, addr, ptep, __pte(0));
147}
148#endif
149
150/*
151 * (pmds are folded into pgds so this doesn't get actually called,
152 * but the define is needed for a generic inline function.)
153 */
154#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
155#define set_pgd(pgdptr, pgdval) do { *(pgdptr) = (pgdval); } while(0)
156
157#define PGD_T_LOG2 ffz(~sizeof(pgd_t))
158#define PMD_T_LOG2 ffz(~sizeof(pmd_t))
159#define PTE_T_LOG2 ffz(~sizeof(pte_t))
160
161extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
162
163/*
164 * The following only work if pte_present() is true.
165 * Undefined behaviour if not..
166 */
167static inline int pte_user(pte_t pte) { BUG(); return 0; }
168#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
169static inline int pte_read(pte_t pte) { return (pte).pte_low & _PAGE_READ; }
170static inline int pte_write(pte_t pte) { return (pte).pte_low & _PAGE_WRITE; }
171static inline int pte_dirty(pte_t pte) { return (pte).pte_low & _PAGE_MODIFIED; }
172static inline int pte_young(pte_t pte) { return (pte).pte_low & _PAGE_ACCESSED; }
173static inline int pte_file(pte_t pte) { return (pte).pte_low & _PAGE_FILE; }
174static inline pte_t pte_wrprotect(pte_t pte)
175{
176 (pte).pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
177 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
178 return pte;
179}
180
181static inline pte_t pte_rdprotect(pte_t pte)
182{
183 (pte).pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
184 (pte).pte_high &= ~_PAGE_SILENT_READ;
185 return pte;
186}
187
188static inline pte_t pte_mkclean(pte_t pte)
189{
190 (pte).pte_low &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
191 (pte).pte_high &= ~_PAGE_SILENT_WRITE;
192 return pte;
193}
194
195static inline pte_t pte_mkold(pte_t pte)
196{
197 (pte).pte_low &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
198 (pte).pte_high &= ~_PAGE_SILENT_READ;
199 return pte;
200}
201
202static inline pte_t pte_mkwrite(pte_t pte)
203{
204 (pte).pte_low |= _PAGE_WRITE;
205 if ((pte).pte_low & _PAGE_MODIFIED) {
206 (pte).pte_low |= _PAGE_SILENT_WRITE;
207 (pte).pte_high |= _PAGE_SILENT_WRITE;
208 }
209 return pte;
210}
211
212static inline pte_t pte_mkread(pte_t pte)
213{
214 (pte).pte_low |= _PAGE_READ;
215 if ((pte).pte_low & _PAGE_ACCESSED) {
216 (pte).pte_low |= _PAGE_SILENT_READ;
217 (pte).pte_high |= _PAGE_SILENT_READ;
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_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
242static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
243static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
244static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
245static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
246
247static inline pte_t pte_wrprotect(pte_t pte)
248{
249 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
250 return pte;
251}
252
253static inline pte_t pte_rdprotect(pte_t pte)
254{
255 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
256 return pte;
257}
258
259static inline pte_t pte_mkclean(pte_t pte)
260{
261 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
262 return pte;
263}
264
265static inline pte_t pte_mkold(pte_t pte)
266{
267 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
268 return pte;
269}
270
271static inline pte_t pte_mkwrite(pte_t pte)
272{
273 pte_val(pte) |= _PAGE_WRITE;
274 if (pte_val(pte) & _PAGE_MODIFIED)
275 pte_val(pte) |= _PAGE_SILENT_WRITE;
276 return pte;
277}
278
279static inline pte_t pte_mkread(pte_t pte)
280{
281 pte_val(pte) |= _PAGE_READ;
282 if (pte_val(pte) & _PAGE_ACCESSED)
283 pte_val(pte) |= _PAGE_SILENT_READ;
284 return pte;
285}
286
287static inline pte_t pte_mkdirty(pte_t pte)
288{
289 pte_val(pte) |= _PAGE_MODIFIED;
290 if (pte_val(pte) & _PAGE_WRITE)
291 pte_val(pte) |= _PAGE_SILENT_WRITE;
292 return pte;
293}
294
295static inline pte_t pte_mkyoung(pte_t pte)
296{
297 pte_val(pte) |= _PAGE_ACCESSED;
298 if (pte_val(pte) & _PAGE_READ)
299 pte_val(pte) |= _PAGE_SILENT_READ;
300 return pte;
301}
302#endif
303
304/*
305 * Macro to make mark a page protection value as "uncacheable". Note
306 * that "protection" is really a misnomer here as the protection value
307 * contains the memory attribute bits, dirty bits, and various other
308 * bits as well.
309 */
310#define pgprot_noncached pgprot_noncached
311
312static inline pgprot_t pgprot_noncached(pgprot_t _prot)
313{
314 unsigned long prot = pgprot_val(_prot);
315
316 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
317
318 return __pgprot(prot);
319}
320
321/*
322 * Conversion functions: convert a page and protection to a page entry,
323 * and a page entry and page directory to the page they refer to.
324 */
325#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
326
327#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
328static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
329{
330 pte.pte_low &= _PAGE_CHG_MASK;
331 pte.pte_low |= pgprot_val(newprot);
332 pte.pte_high |= pgprot_val(newprot) & 0x3f;
333 return pte;
334}
335#else
336static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
337{
338 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
339}
340#endif
341
342
343extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
344 pte_t pte);
345extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
346 pte_t pte);
347
348static inline void update_mmu_cache(struct vm_area_struct *vma,
349 unsigned long address, pte_t pte)
350{
351 __update_tlb(vma, address, pte);
352 __update_cache(vma, address, pte);
353}
354
355#ifndef CONFIG_NEED_MULTIPLE_NODES
356#define kern_addr_valid(addr) (1)
357#endif
358
359#ifdef CONFIG_64BIT_PHYS_ADDR
360extern phys_t fixup_bigphys_addr(phys_t phys_addr, phys_t size);
361extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
362
363static inline int io_remap_pfn_range(struct vm_area_struct *vma,
364 unsigned long vaddr,
365 unsigned long pfn,
366 unsigned long size,
367 pgprot_t prot)
368{
369 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
370 return remap_pfn_range(vma, vaddr, pfn, size, prot);
371}
372#else
373#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
374 remap_pfn_range(vma, vaddr, pfn, size, prot)
375#endif
376
377#define MK_IOSPACE_PFN(space, pfn) (pfn)
378#define GET_IOSPACE(pfn) 0
379#define GET_PFN(pfn) (pfn)
380
381#include <asm-generic/pgtable.h>
382
383/*
384 * We provide our own get_unmapped area to cope with the virtual aliasing
385 * constraints placed on us by the cache architecture.
386 */
387#define HAVE_ARCH_UNMAPPED_AREA
388
389/*
390 * No page table caches to initialise
391 */
392#define pgtable_cache_init() do { } while (0)
393
394#endif /* _ASM_PGTABLE_H */