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
6 * Copyright (C) 2003 Ralf Baechle
12 #include <asm/pgtable-32.h>
15 #include <asm/pgtable-64.h>
19 #include <asm/pgtable-bits.h>
22 struct vm_area_struct;
24 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
25 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
26 _page_cachable_default)
27 #define PAGE_COPY __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | \
28 (kernel_uses_smartmips_rixi ? _PAGE_NO_EXEC : 0) | _page_cachable_default)
29 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | (kernel_uses_smartmips_rixi ? 0 : _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 | (kernel_uses_smartmips_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
34 _page_cachable_default)
35 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
36 __WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)
39 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
40 * execute, and consider it to be the same as read. Also, write
41 * permissions imply read permissions. This is the closest we can get
42 * by reasonable means..
46 * Dummy values to fill the table in mmap.c
47 * The real values will be generated at runtime
49 #define __P000 __pgprot(0)
50 #define __P001 __pgprot(0)
51 #define __P010 __pgprot(0)
52 #define __P011 __pgprot(0)
53 #define __P100 __pgprot(0)
54 #define __P101 __pgprot(0)
55 #define __P110 __pgprot(0)
56 #define __P111 __pgprot(0)
58 #define __S000 __pgprot(0)
59 #define __S001 __pgprot(0)
60 #define __S010 __pgprot(0)
61 #define __S011 __pgprot(0)
62 #define __S100 __pgprot(0)
63 #define __S101 __pgprot(0)
64 #define __S110 __pgprot(0)
65 #define __S111 __pgprot(0)
67 extern unsigned long _page_cachable_default;
70 * ZERO_PAGE is a global shared page that is always zero; used
71 * for zero-mapped memory areas etc..
74 extern unsigned long empty_zero_page;
75 extern unsigned long zero_page_mask;
77 #define ZERO_PAGE(vaddr) \
78 (virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
80 #define is_zero_pfn is_zero_pfn
81 static inline int is_zero_pfn(unsigned long pfn)
83 extern unsigned long zero_pfn;
84 unsigned long offset_from_zero_pfn = pfn - zero_pfn;
85 return offset_from_zero_pfn <= (zero_page_mask >> PAGE_SHIFT);
88 #define my_zero_pfn(addr) page_to_pfn(ZERO_PAGE(addr))
90 extern void paging_init(void);
93 * Conversion functions: convert a page and protection to a page entry,
94 * and a page entry and page directory to the page they refer to.
96 #define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
97 #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
98 #define pmd_page_vaddr(pmd) pmd_val(pmd)
100 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
102 #define pte_none(pte) (!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
103 #define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
105 static inline void set_pte(pte_t *ptep, pte_t pte)
107 ptep->pte_high = pte.pte_high;
109 ptep->pte_low = pte.pte_low;
110 //printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
112 if (pte.pte_low & _PAGE_GLOBAL) {
113 pte_t *buddy = ptep_buddy(ptep);
115 * Make sure the buddy is global too (if it's !none,
116 * it better already be global)
118 if (pte_none(*buddy)) {
119 buddy->pte_low |= _PAGE_GLOBAL;
120 buddy->pte_high |= _PAGE_GLOBAL;
124 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
126 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
128 pte_t null = __pte(0);
130 /* Preserve global status for the pair */
131 if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
132 null.pte_low = null.pte_high = _PAGE_GLOBAL;
134 set_pte_at(mm, addr, ptep, null);
138 #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
139 #define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
142 * Certain architectures need to do special things when pte's
143 * within a page table are directly modified. Thus, the following
144 * hook is made available.
146 static inline void set_pte(pte_t *ptep, pte_t pteval)
149 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
150 if (pte_val(pteval) & _PAGE_GLOBAL) {
151 pte_t *buddy = ptep_buddy(ptep);
153 * Make sure the buddy is global too (if it's !none,
154 * it better already be global)
158 * For SMP, multiple CPUs can race, so we need to do
162 #define LL_INSN "lld"
163 #define SC_INSN "scd"
164 #else /* CONFIG_32BIT */
168 unsigned long page_global = _PAGE_GLOBAL;
171 if (kernel_uses_llsc && R10000_LLSC_WAR) {
172 __asm__ __volatile__ (
173 " .set arch=r4000 \n"
176 "1:" LL_INSN " %[tmp], %[buddy] \n"
177 " bnez %[tmp], 2f \n"
178 " or %[tmp], %[tmp], %[global] \n"
179 SC_INSN " %[tmp], %[buddy] \n"
180 " beqzl %[tmp], 1b \n"
185 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
186 : [global] "r" (page_global));
187 } else if (kernel_uses_llsc) {
188 __asm__ __volatile__ (
189 " .set arch=r4000 \n"
192 "1:" LL_INSN " %[tmp], %[buddy] \n"
193 " bnez %[tmp], 2f \n"
194 " or %[tmp], %[tmp], %[global] \n"
195 SC_INSN " %[tmp], %[buddy] \n"
196 " beqz %[tmp], 1b \n"
201 : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
202 : [global] "r" (page_global));
204 #else /* !CONFIG_SMP */
205 if (pte_none(*buddy))
206 pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
207 #endif /* CONFIG_SMP */
211 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
213 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
215 #if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
216 /* Preserve global status for the pair */
217 if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
218 set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
221 set_pte_at(mm, addr, ptep, __pte(0));
226 * (pmds are folded into puds so this doesn't get actually called,
227 * but the define is needed for a generic inline function.)
229 #define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
231 #ifndef __PAGETABLE_PMD_FOLDED
233 * (puds are folded into pgds so this doesn't get actually called,
234 * but the define is needed for a generic inline function.)
236 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
239 #define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
240 #define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
241 #define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
244 * We used to declare this array with size but gcc 3.3 and older are not able
245 * to find that this expression is a constant, so the size is dropped.
247 extern pgd_t swapper_pg_dir[];
250 * The following only work if pte_present() is true.
251 * Undefined behaviour if not..
253 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
254 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
255 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
256 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
257 static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
259 static inline pte_t pte_wrprotect(pte_t pte)
261 pte.pte_low &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
262 pte.pte_high &= ~_PAGE_SILENT_WRITE;
266 static inline pte_t pte_mkclean(pte_t pte)
268 pte.pte_low &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
269 pte.pte_high &= ~_PAGE_SILENT_WRITE;
273 static inline pte_t pte_mkold(pte_t pte)
275 pte.pte_low &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
276 pte.pte_high &= ~_PAGE_SILENT_READ;
280 static inline pte_t pte_mkwrite(pte_t pte)
282 pte.pte_low |= _PAGE_WRITE;
283 if (pte.pte_low & _PAGE_MODIFIED) {
284 pte.pte_low |= _PAGE_SILENT_WRITE;
285 pte.pte_high |= _PAGE_SILENT_WRITE;
290 static inline pte_t pte_mkdirty(pte_t pte)
292 pte.pte_low |= _PAGE_MODIFIED;
293 if (pte.pte_low & _PAGE_WRITE) {
294 pte.pte_low |= _PAGE_SILENT_WRITE;
295 pte.pte_high |= _PAGE_SILENT_WRITE;
300 static inline pte_t pte_mkyoung(pte_t pte)
302 pte.pte_low |= _PAGE_ACCESSED;
303 if (pte.pte_low & _PAGE_READ) {
304 pte.pte_low |= _PAGE_SILENT_READ;
305 pte.pte_high |= _PAGE_SILENT_READ;
310 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
311 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
312 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
313 static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
315 static inline pte_t pte_wrprotect(pte_t pte)
317 pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
321 static inline pte_t pte_mkclean(pte_t pte)
323 pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
327 static inline pte_t pte_mkold(pte_t pte)
329 pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
333 static inline pte_t pte_mkwrite(pte_t pte)
335 pte_val(pte) |= _PAGE_WRITE;
336 if (pte_val(pte) & _PAGE_MODIFIED)
337 pte_val(pte) |= _PAGE_SILENT_WRITE;
341 static inline pte_t pte_mkdirty(pte_t pte)
343 pte_val(pte) |= _PAGE_MODIFIED;
344 if (pte_val(pte) & _PAGE_WRITE)
345 pte_val(pte) |= _PAGE_SILENT_WRITE;
349 static inline pte_t pte_mkyoung(pte_t pte)
351 pte_val(pte) |= _PAGE_ACCESSED;
352 if (kernel_uses_smartmips_rixi) {
353 if (!(pte_val(pte) & _PAGE_NO_READ))
354 pte_val(pte) |= _PAGE_SILENT_READ;
356 if (pte_val(pte) & _PAGE_READ)
357 pte_val(pte) |= _PAGE_SILENT_READ;
363 static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
365 static inline pte_t pte_mkhuge(pte_t pte)
367 pte_val(pte) |= _PAGE_HUGE;
370 #endif /* _PAGE_HUGE */
372 static inline int pte_special(pte_t pte) { return 0; }
373 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
376 * Macro to make mark a page protection value as "uncacheable". Note
377 * that "protection" is really a misnomer here as the protection value
378 * contains the memory attribute bits, dirty bits, and various other
381 #define pgprot_noncached pgprot_noncached
383 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
385 unsigned long prot = pgprot_val(_prot);
387 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
389 return __pgprot(prot);
393 * Conversion functions: convert a page and protection to a page entry,
394 * and a page entry and page directory to the page they refer to.
396 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
398 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
399 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
401 pte.pte_low &= _PAGE_CHG_MASK;
402 pte.pte_high &= ~0x3f;
403 pte.pte_low |= pgprot_val(newprot);
404 pte.pte_high |= pgprot_val(newprot) & 0x3f;
408 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
410 return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
415 extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
417 extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
420 static inline void update_mmu_cache(struct vm_area_struct *vma,
421 unsigned long address, pte_t *ptep)
424 __update_tlb(vma, address, pte);
425 __update_cache(vma, address, pte);
428 #define kern_addr_valid(addr) (1)
430 #ifdef CONFIG_64BIT_PHYS_ADDR
431 extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
433 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
439 phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
440 return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
443 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
444 remap_pfn_range(vma, vaddr, pfn, size, prot)
447 #include <asm-generic/pgtable.h>
450 * uncached accelerated TLB map for video memory access
452 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
453 #define __HAVE_PHYS_MEM_ACCESS_PROT
456 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
457 unsigned long size, pgprot_t vma_prot);
458 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
459 unsigned long size, pgprot_t *vma_prot);
463 * We provide our own get_unmapped area to cope with the virtual aliasing
464 * constraints placed on us by the cache architecture.
466 #define HAVE_ARCH_UNMAPPED_AREA
467 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
470 * No page table caches to initialise
472 #define pgtable_cache_init() do { } while (0)
474 #endif /* _ASM_PGTABLE_H */