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.
20 * PAGE_SHIFT determines the page size
22 #ifdef CONFIG_PAGE_SIZE_4KB
25 #ifdef CONFIG_PAGE_SIZE_8KB
28 #ifdef CONFIG_PAGE_SIZE_16KB
31 #ifdef CONFIG_PAGE_SIZE_64KB
34 #define PAGE_SIZE (1UL << PAGE_SHIFT)
35 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
41 extern void clear_page(void * page
);
42 extern void copy_page(void * to
, void * from
);
44 extern unsigned long shm_align_mask
;
46 static inline unsigned long pages_do_alias(unsigned long addr1
,
49 return (addr1
^ addr2
) & shm_align_mask
;
54 static inline void clear_user_page(void *addr
, unsigned long vaddr
,
57 extern void (*flush_data_cache_page
)(unsigned long addr
);
60 if (pages_do_alias((unsigned long) addr
, vaddr
))
61 flush_data_cache_page((unsigned long)addr
);
64 static inline void copy_user_page(void *vto
, void *vfrom
, unsigned long vaddr
,
67 extern void (*flush_data_cache_page
)(unsigned long addr
);
69 copy_page(vto
, vfrom
);
70 if (pages_do_alias((unsigned long)vto
, vaddr
))
71 flush_data_cache_page((unsigned long)vto
);
75 * These are used to make use of C type-checking..
77 #ifdef CONFIG_64BIT_PHYS_ADDR
78 #ifdef CONFIG_CPU_MIPS32
79 typedef struct { unsigned long pte_low
, pte_high
; } pte_t
;
80 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
82 typedef struct { unsigned long long pte
; } pte_t
;
83 #define pte_val(x) ((x).pte)
86 typedef struct { unsigned long pte
; } pte_t
;
87 #define pte_val(x) ((x).pte)
89 #define __pte(x) ((pte_t) { (x) } )
92 * For 3-level pagetables we defines these ourselves, for 2-level the
93 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
97 typedef struct { unsigned long pmd
; } pmd_t
;
98 #define pmd_val(x) ((x).pmd)
99 #define __pmd(x) ((pmd_t) { (x) } )
104 * Right now we don't support 4-level pagetables, so all pud-related
105 * definitions come from <asm-generic/pgtable-nopud.h>.
109 * Finall the top of the hierarchy, the pgd
111 typedef struct { unsigned long pgd
; } pgd_t
;
112 #define pgd_val(x) ((x).pgd)
113 #define __pgd(x) ((pgd_t) { (x) } )
116 * Manipulate page protection bits
118 typedef struct { unsigned long pgprot
; } pgprot_t
;
119 #define pgprot_val(x) ((x).pgprot)
120 #define __pgprot(x) ((pgprot_t) { (x) } )
123 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
124 * pair of pages we only have a single global bit per pair of pages. When
125 * writing to the TLB make sure we always have the bit set for both pages
126 * or none. This macro is used to access the `buddy' of the pte we're just
129 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
131 #endif /* !__ASSEMBLY__ */
133 /* to align the pointer to the (next) page boundary */
134 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
136 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
137 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
139 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
141 #ifndef CONFIG_NEED_MULTIPLE_NODES
142 #define pfn_valid(pfn) ((pfn) < max_mapnr)
145 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
146 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
148 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
149 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
151 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
152 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
154 #endif /* defined (__KERNEL__) */
156 #ifdef CONFIG_LIMITED_DMA
157 #define WANT_PAGE_VIRTUAL
160 #include <asm-generic/memory_model.h>
161 #include <asm-generic/page.h>
163 #endif /* _ASM_PAGE_H */