Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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#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
44/*
45 * Dummy values to fill the table in mmap.c
46 * The real values will be generated at runtime
47 */
48#define __P000 __pgprot(0)
49#define __P001 __pgprot(0)
50#define __P010 __pgprot(0)
51#define __P011 __pgprot(0)
52#define __P100 __pgprot(0)
53#define __P101 __pgprot(0)
54#define __P110 __pgprot(0)
55#define __P111 __pgprot(0)
56
57#define __S000 __pgprot(0)
58#define __S001 __pgprot(0)
59#define __S010 __pgprot(0)
60#define __S011 __pgprot(0)
61#define __S100 __pgprot(0)
62#define __S101 __pgprot(0)
63#define __S110 __pgprot(0)
64#define __S111 __pgprot(0)
65
66extern unsigned long _page_cachable_default;
67
68/*
69 * ZERO_PAGE is a global shared page that is always zero; used
70 * for zero-mapped memory areas etc..
71 */
72
73extern unsigned long empty_zero_page;
74extern unsigned long zero_page_mask;
75
76#define ZERO_PAGE(vaddr) \
77 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
78
79extern void paging_init(void);
80
81/*
82 * Conversion functions: convert a page and protection to a page entry,
83 * and a page entry and page directory to the page they refer to.
84 */
85#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
86#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
87#define pmd_page_vaddr(pmd) pmd_val(pmd)
88
89#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
90
91#define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
92#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
93
94static inline void set_pte(pte_t *ptep, pte_t pte)
95{
96 ptep->pte_high = pte.pte_high;
97 smp_wmb();
98 ptep->pte_low = pte.pte_low;
99 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
100
101 if (pte.pte_low & _PAGE_GLOBAL) {
102 pte_t *buddy = ptep_buddy(ptep);
103 /*
104 * Make sure the buddy is global too (if it's !none,
105 * it better already be global)
106 */
107 if (pte_none(*buddy)) {
108 buddy->pte_low |= _PAGE_GLOBAL;
109 buddy->pte_high |= _PAGE_GLOBAL;
110 }
111 }
112}
113#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
114
115static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
116{
117 pte_t null = __pte(0);
118
119 /* Preserve global status for the pair */
120 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
121 null.pte_low = null.pte_high = _PAGE_GLOBAL;
122
123 set_pte_at(mm, addr, ptep, null);
124}
125#else
126
127#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
128#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
129
130/*
131 * Certain architectures need to do special things when pte's
132 * within a page table are directly modified. Thus, the following
133 * hook is made available.
134 */
135static inline void set_pte(pte_t *ptep, pte_t pteval)
136{
137 *ptep = pteval;
138#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
139 if (pte_val(pteval) & _PAGE_GLOBAL) {
140 pte_t *buddy = ptep_buddy(ptep);
141 /*
142 * Make sure the buddy is global too (if it's !none,
143 * it better already be global)
144 */
145 if (pte_none(*buddy))
146 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
147 }
148#endif
149}
150#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
151
152static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
153{
154#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
155 /* Preserve global status for the pair */
156 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
157 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
158 else
159#endif
160 set_pte_at(mm, addr, ptep, __pte(0));
161}
162#endif
163
164/*
165 * (pmds are folded into puds so this doesn't get actually called,
166 * but the define is needed for a generic inline function.)
167 */
168#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
169
170#ifdef CONFIG_64BIT
171/*
172 * (puds are folded into pgds so this doesn't get actually called,
173 * but the define is needed for a generic inline function.)
174 */
175#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
176#endif
177
178#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
179#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
180#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
181
182/*
183 * We used to declare this array with size but gcc 3.3 and older are not able
184 * to find that this expression is a constant, so the size is dropped.
185 */
186extern pgd_t swapper_pg_dir[];
187
188/*
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
191 */
192#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
193static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
194static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
195static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
196static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
197
198static inline pte_t pte_wrprotect(pte_t pte)
199{
200 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
201 pte.pte_high &= ~_PAGE_SILENT_WRITE;
202 return pte;
203}
204
205static inline pte_t pte_mkclean(pte_t pte)
206{
207 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
208 pte.pte_high &= ~_PAGE_SILENT_WRITE;
209 return pte;
210}
211
212static inline pte_t pte_mkold(pte_t pte)
213{
214 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
215 pte.pte_high &= ~_PAGE_SILENT_READ;
216 return pte;
217}
218
219static inline pte_t pte_mkwrite(pte_t pte)
220{
221 pte.pte_low |= _PAGE_WRITE;
222 if (pte.pte_low & _PAGE_MODIFIED) {
223 pte.pte_low |= _PAGE_SILENT_WRITE;
224 pte.pte_high |= _PAGE_SILENT_WRITE;
225 }
226 return pte;
227}
228
229static inline pte_t pte_mkdirty(pte_t pte)
230{
231 pte.pte_low |= _PAGE_MODIFIED;
232 if (pte.pte_low & _PAGE_WRITE) {
233 pte.pte_low |= _PAGE_SILENT_WRITE;
234 pte.pte_high |= _PAGE_SILENT_WRITE;
235 }
236 return pte;
237}
238
239static inline pte_t pte_mkyoung(pte_t pte)
240{
241 pte.pte_low |= _PAGE_ACCESSED;
242 if (pte.pte_low & _PAGE_READ)
243 pte.pte_low |= _PAGE_SILENT_READ;
244 pte.pte_high |= _PAGE_SILENT_READ;
245 return pte;
246}
247#else
248static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
249static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
250static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
251static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
252
253static inline pte_t pte_wrprotect(pte_t pte)
254{
255 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
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_mkdirty(pte_t pte)
280{
281 pte_val(pte) |= _PAGE_MODIFIED;
282 if (pte_val(pte) & _PAGE_WRITE)
283 pte_val(pte) |= _PAGE_SILENT_WRITE;
284 return pte;
285}
286
287static inline pte_t pte_mkyoung(pte_t pte)
288{
289 pte_val(pte) |= _PAGE_ACCESSED;
290 if (pte_val(pte) & _PAGE_READ)
291 pte_val(pte) |= _PAGE_SILENT_READ;
292 return pte;
293}
294#endif
295static inline int pte_special(pte_t pte) { return 0; }
296static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
297
298/*
299 * Macro to make mark a page protection value as "uncacheable". Note
300 * that "protection" is really a misnomer here as the protection value
301 * contains the memory attribute bits, dirty bits, and various other
302 * bits as well.
303 */
304#define pgprot_noncached pgprot_noncached
305
306static inline pgprot_t pgprot_noncached(pgprot_t _prot)
307{
308 unsigned long prot = pgprot_val(_prot);
309
310 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
311
312 return __pgprot(prot);
313}
314
315/*
316 * Conversion functions: convert a page and protection to a page entry,
317 * and a page entry and page directory to the page they refer to.
318 */
319#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
320
321#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
322static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
323{
324 pte.pte_low &= _PAGE_CHG_MASK;
325 pte.pte_high &= ~0x3f;
326 pte.pte_low |= pgprot_val(newprot);
327 pte.pte_high |= pgprot_val(newprot) & 0x3f;
328 return pte;
329}
330#else
331static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
332{
333 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
334}
335#endif
336
337
338extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
339 pte_t pte);
340extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
341 pte_t pte);
342
343static inline void update_mmu_cache(struct vm_area_struct *vma,
344 unsigned long address, pte_t pte)
345{
346 __update_tlb(vma, address, pte);
347 __update_cache(vma, address, pte);
348}
349
350#define kern_addr_valid(addr) (1)
351
352#ifdef CONFIG_64BIT_PHYS_ADDR
353extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
354
355static inline int io_remap_pfn_range(struct vm_area_struct *vma,
356 unsigned long vaddr,
357 unsigned long pfn,
358 unsigned long size,
359 pgprot_t prot)
360{
361 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
362 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
363}
364#else
365#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
366 remap_pfn_range(vma, vaddr, pfn, size, prot)
367#endif
368
369#include <asm-generic/pgtable.h>
370
371/*
372 * We provide our own get_unmapped area to cope with the virtual aliasing
373 * constraints placed on us by the cache architecture.
374 */
375#define HAVE_ARCH_UNMAPPED_AREA
376
377/*
378 * No page table caches to initialise
379 */
380#define pgtable_cache_init() do { } while (0)
381
382#endif /* _ASM_PGTABLE_H */