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#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(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
71
72#define __HAVE_ARCH_MOVE_PTE
73#define move_pte(pte, prot, old_addr, new_addr) \
74({ \
75 pte_t newpte = (pte); \
76 if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
77 pte_page(pte) == ZERO_PAGE(old_addr)) \
78 newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
79 newpte; \
80})
81
82extern void paging_init(void);
83
84/*
85 * Conversion functions: convert a page and protection to a page entry,
86 * and a page entry and page directory to the page they refer to.
87 */
88#define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
89#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
90#define pmd_page_kernel(pmd) pmd_val(pmd)
91
92#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
93
94#define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
95#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
96
97static inline void set_pte(pte_t *ptep, pte_t pte)
98{
99 ptep->pte_high = pte.pte_high;
100 smp_wmb();
101 ptep->pte_low = pte.pte_low;
102 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
103
104 if (pte.pte_low & _PAGE_GLOBAL) {
105 pte_t *buddy = ptep_buddy(ptep);
106 /*
107 * Make sure the buddy is global too (if it's !none,
108 * it better already be global)
109 */
110 if (pte_none(*buddy)) {
111 buddy->pte_low |= _PAGE_GLOBAL;
112 buddy->pte_high |= _PAGE_GLOBAL;
113 }
114 }
115}
116#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
117
118static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
119{
120 pte_t null = __pte(0);
121
122 /* Preserve global status for the pair */
123 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
124 null.pte_low = null.pte_high = _PAGE_GLOBAL;
125
126 set_pte_at(mm, addr, ptep, null);
127}
128#else
129
130#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
131#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
132
133/*
134 * Certain architectures need to do special things when pte's
135 * within a page table are directly modified. Thus, the following
136 * hook is made available.
137 */
138static inline void set_pte(pte_t *ptep, pte_t pteval)
139{
140 *ptep = pteval;
141#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
142 if (pte_val(pteval) & _PAGE_GLOBAL) {
143 pte_t *buddy = ptep_buddy(ptep);
144 /*
145 * Make sure the buddy is global too (if it's !none,
146 * it better already be global)
147 */
148 if (pte_none(*buddy))
149 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
150 }
151#endif
152}
153#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
154
155static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
156{
157#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
158 /* Preserve global status for the pair */
159 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
160 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
161 else
162#endif
163 set_pte_at(mm, addr, ptep, __pte(0));
164}
165#endif
166
167/*
168 * (pmds are folded into puds so this doesn't get actually called,
169 * but the define is needed for a generic inline function.)
170 */
171#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
172
173#ifdef CONFIG_64BIT
174/*
175 * (puds are folded into pgds so this doesn't get actually called,
176 * but the define is needed for a generic inline function.)
177 */
178#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
179#endif
180
181#define PGD_T_LOG2 ffz(~sizeof(pgd_t))
182#define PMD_T_LOG2 ffz(~sizeof(pmd_t))
183#define PTE_T_LOG2 ffz(~sizeof(pte_t))
184
185extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
186
187/*
188 * The following only work if pte_present() is true.
189 * Undefined behaviour if not..
190 */
191static inline int pte_user(pte_t pte) { BUG(); return 0; }
192#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
193static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; }
194static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
195static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
196static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
197static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
198
199static inline pte_t pte_wrprotect(pte_t pte)
200{
201 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
202 pte.pte_high &= ~_PAGE_SILENT_WRITE;
203 return pte;
204}
205
206static inline pte_t pte_rdprotect(pte_t pte)
207{
208 pte.pte_low &= ~(_PAGE_READ | _PAGE_SILENT_READ);
209 pte.pte_high &= ~_PAGE_SILENT_READ;
210 return pte;
211}
212
213static inline pte_t pte_mkclean(pte_t pte)
214{
215 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
216 pte.pte_high &= ~_PAGE_SILENT_WRITE;
217 return pte;
218}
219
220static inline pte_t pte_mkold(pte_t pte)
221{
222 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
223 pte.pte_high &= ~_PAGE_SILENT_READ;
224 return pte;
225}
226
227static inline pte_t pte_mkwrite(pte_t pte)
228{
229 pte.pte_low |= _PAGE_WRITE;
230 if (pte.pte_low & _PAGE_MODIFIED) {
231 pte.pte_low |= _PAGE_SILENT_WRITE;
232 pte.pte_high |= _PAGE_SILENT_WRITE;
233 }
234 return pte;
235}
236
237static inline pte_t pte_mkread(pte_t pte)
238{
239 pte.pte_low |= _PAGE_READ;
240 if (pte.pte_low & _PAGE_ACCESSED) {
241 pte.pte_low |= _PAGE_SILENT_READ;
242 pte.pte_high |= _PAGE_SILENT_READ;
243 }
244 return pte;
245}
246
247static inline pte_t pte_mkdirty(pte_t pte)
248{
249 pte.pte_low |= _PAGE_MODIFIED;
250 if (pte.pte_low & _PAGE_WRITE) {
251 pte.pte_low |= _PAGE_SILENT_WRITE;
252 pte.pte_high |= _PAGE_SILENT_WRITE;
253 }
254 return pte;
255}
256
257static inline pte_t pte_mkyoung(pte_t pte)
258{
259 pte.pte_low |= _PAGE_ACCESSED;
260 if (pte.pte_low & _PAGE_READ)
261 pte.pte_low |= _PAGE_SILENT_READ;
262 pte.pte_high |= _PAGE_SILENT_READ;
263 return pte;
264}
265#else
266static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
267static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
268static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
269static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
270static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
271
272static inline pte_t pte_wrprotect(pte_t pte)
273{
274 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
275 return pte;
276}
277
278static inline pte_t pte_rdprotect(pte_t pte)
279{
280 pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
281 return pte;
282}
283
284static inline pte_t pte_mkclean(pte_t pte)
285{
286 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
287 return pte;
288}
289
290static inline pte_t pte_mkold(pte_t pte)
291{
292 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
293 return pte;
294}
295
296static inline pte_t pte_mkwrite(pte_t pte)
297{
298 pte_val(pte) |= _PAGE_WRITE;
299 if (pte_val(pte) & _PAGE_MODIFIED)
300 pte_val(pte) |= _PAGE_SILENT_WRITE;
301 return pte;
302}
303
304static inline pte_t pte_mkread(pte_t pte)
305{
306 pte_val(pte) |= _PAGE_READ;
307 if (pte_val(pte) & _PAGE_ACCESSED)
308 pte_val(pte) |= _PAGE_SILENT_READ;
309 return pte;
310}
311
312static inline pte_t pte_mkdirty(pte_t pte)
313{
314 pte_val(pte) |= _PAGE_MODIFIED;
315 if (pte_val(pte) & _PAGE_WRITE)
316 pte_val(pte) |= _PAGE_SILENT_WRITE;
317 return pte;
318}
319
320static inline pte_t pte_mkyoung(pte_t pte)
321{
322 pte_val(pte) |= _PAGE_ACCESSED;
323 if (pte_val(pte) & _PAGE_READ)
324 pte_val(pte) |= _PAGE_SILENT_READ;
325 return pte;
326}
327#endif
328
329/*
330 * Macro to make mark a page protection value as "uncacheable". Note
331 * that "protection" is really a misnomer here as the protection value
332 * contains the memory attribute bits, dirty bits, and various other
333 * bits as well.
334 */
335#define pgprot_noncached pgprot_noncached
336
337static inline pgprot_t pgprot_noncached(pgprot_t _prot)
338{
339 unsigned long prot = pgprot_val(_prot);
340
341 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
342
343 return __pgprot(prot);
344}
345
346/*
347 * Conversion functions: convert a page and protection to a page entry,
348 * and a page entry and page directory to the page they refer to.
349 */
350#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
351
352#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
353static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
354{
355 pte.pte_low &= _PAGE_CHG_MASK;
356 pte.pte_high &= ~0x3f;
357 pte.pte_low |= pgprot_val(newprot);
358 pte.pte_high |= pgprot_val(newprot) & 0x3f;
359 return pte;
360}
361#else
362static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
363{
364 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
365}
366#endif
367
368
369extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
370 pte_t pte);
371extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
372 pte_t pte);
373
374static inline void update_mmu_cache(struct vm_area_struct *vma,
375 unsigned long address, pte_t pte)
376{
377 __update_tlb(vma, address, pte);
378 __update_cache(vma, address, pte);
379}
380
381#define kern_addr_valid(addr) (1)
382
383#ifdef CONFIG_64BIT_PHYS_ADDR
384extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
385
386static inline int io_remap_pfn_range(struct vm_area_struct *vma,
387 unsigned long vaddr,
388 unsigned long pfn,
389 unsigned long size,
390 pgprot_t prot)
391{
392 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
393 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
394}
395#else
396#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
397 remap_pfn_range(vma, vaddr, pfn, size, prot)
398#endif
399
400#define MK_IOSPACE_PFN(space, pfn) (pfn)
401#define GET_IOSPACE(pfn) 0
402#define GET_PFN(pfn) (pfn)
403
404#include <asm-generic/pgtable.h>
405
406/*
407 * We provide our own get_unmapped area to cope with the virtual aliasing
408 * constraints placed on us by the cache architecture.
409 */
410#define HAVE_ARCH_UNMAPPED_AREA
411
412/*
413 * No page table caches to initialise
414 */
415#define pgtable_cache_init() do { } while (0)
416
417#endif /* _ASM_PGTABLE_H */