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) 1994 - 1999, 2000, 03 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
18 * PAGE_SHIFT determines the page size
20 #ifdef CONFIG_PAGE_SIZE_4KB
23 #ifdef CONFIG_PAGE_SIZE_8KB
26 #ifdef CONFIG_PAGE_SIZE_16KB
29 #ifdef CONFIG_PAGE_SIZE_64KB
32 #define PAGE_SIZE (1UL << PAGE_SHIFT)
33 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
37 extern void clear_page(void * page
);
38 extern void copy_page(void * to
, void * from
);
40 extern unsigned long shm_align_mask
;
42 static inline unsigned long pages_do_alias(unsigned long addr1
,
45 return (addr1
^ addr2
) & shm_align_mask
;
50 static inline void clear_user_page(void *addr
, unsigned long vaddr
,
53 extern void (*flush_data_cache_page
)(unsigned long addr
);
56 if (pages_do_alias((unsigned long) addr
, vaddr
))
57 flush_data_cache_page((unsigned long)addr
);
60 static inline void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
63 extern void (*flush_data_cache_page
)(unsigned long addr
);
65 copy_page(vto
, vfrom
);
66 if (pages_do_alias((unsigned long)vto
, vaddr
))
67 flush_data_cache_page((unsigned long)vto
);
71 * These are used to make use of C type-checking..
73 #ifdef CONFIG_64BIT_PHYS_ADDR
74 #ifdef CONFIG_CPU_MIPS32
75 typedef struct { unsigned long pte_low
, pte_high
; } pte_t
;
76 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
78 typedef struct { unsigned long long pte
; } pte_t
;
79 #define pte_val(x) ((x).pte)
82 typedef struct { unsigned long pte
; } pte_t
;
83 #define pte_val(x) ((x).pte)
85 #define __pte(x) ((pte_t) { (x) } )
88 * For 3-level pagetables we defines these ourselves, for 2-level the
89 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
93 typedef struct { unsigned long pmd
; } pmd_t
;
94 #define pmd_val(x) ((x).pmd)
95 #define __pmd(x) ((pmd_t) { (x) } )
100 * Right now we don't support 4-level pagetables, so all pud-related
101 * definitions come from <asm-generic/pgtable-nopud.h>.
105 * Finall the top of the hierarchy, the pgd
107 typedef struct { unsigned long pgd
; } pgd_t
;
108 #define pgd_val(x) ((x).pgd)
109 #define __pgd(x) ((pgd_t) { (x) } )
112 * Manipulate page protection bits
114 typedef struct { unsigned long pgprot
; } pgprot_t
;
115 #define pgprot_val(x) ((x).pgprot)
116 #define __pgprot(x) ((pgprot_t) { (x) } )
119 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
120 * pair of pages we only have a single global bit per pair of pages. When
121 * writing to the TLB make sure we always have the bit set for both pages
122 * or none. This macro is used to access the `buddy' of the pte we're just
125 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
127 #endif /* !__ASSEMBLY__ */
129 /* to align the pointer to the (next) page boundary */
130 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
132 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
133 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
135 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
137 #ifdef CONFIG_FLATMEM
139 #define pfn_valid(pfn) ((pfn) < max_mapnr)
141 #elif defined(CONFIG_SPARSEMEM)
143 /* pfn_valid is defined in linux/mmzone.h */
145 #elif defined(CONFIG_NEED_MULTIPLE_NODES)
147 #define pfn_valid(pfn) \
149 unsigned long __pfn = (pfn); \
150 int __n = pfn_to_nid(__pfn); \
151 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
152 NODE_DATA(__n)->node_spanned_pages) \
158 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
159 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
161 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
162 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
164 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
165 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
167 #ifdef CONFIG_LIMITED_DMA
168 #define WANT_PAGE_VIRTUAL
171 #include <asm-generic/memory_model.h>
172 #include <asm-generic/page.h>
174 #endif /* defined (__KERNEL__) */
176 #endif /* _ASM_PAGE_H */