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.
12 #include <linux/config.h>
21 * PAGE_SHIFT determines the page size
23 #ifdef CONFIG_PAGE_SIZE_4KB
26 #ifdef CONFIG_PAGE_SIZE_8KB
29 #ifdef CONFIG_PAGE_SIZE_16KB
32 #ifdef CONFIG_PAGE_SIZE_64KB
35 #define PAGE_SIZE (1UL << PAGE_SHIFT)
36 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
42 extern void clear_page(void * page);
43 extern void copy_page(void * to, void * from);
45 extern unsigned long shm_align_mask;
47 static inline unsigned long pages_do_alias(unsigned long addr1,
50 return (addr1 ^ addr2) & shm_align_mask;
55 static inline void clear_user_page(void *addr, unsigned long vaddr,
58 extern void (*flush_data_cache_page)(unsigned long addr);
61 if (pages_do_alias((unsigned long) addr, vaddr))
62 flush_data_cache_page((unsigned long)addr);
65 static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
68 extern void (*flush_data_cache_page)(unsigned long addr);
70 copy_page(vto, vfrom);
71 if (pages_do_alias((unsigned long)vto, vaddr))
72 flush_data_cache_page((unsigned long)vto);
76 * These are used to make use of C type-checking..
78 #ifdef CONFIG_64BIT_PHYS_ADDR
79 #ifdef CONFIG_CPU_MIPS32
80 typedef struct { unsigned long pte_low, pte_high; } pte_t;
81 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
83 typedef struct { unsigned long long pte; } pte_t;
84 #define pte_val(x) ((x).pte)
87 typedef struct { unsigned long pte; } pte_t;
88 #define pte_val(x) ((x).pte)
90 #define __pte(x) ((pte_t) { (x) } )
93 * For 3-level pagetables we defines these ourselves, for 2-level the
94 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
98 typedef struct { unsigned long pmd; } pmd_t;
99 #define pmd_val(x) ((x).pmd)
100 #define __pmd(x) ((pmd_t) { (x) } )
105 * Right now we don't support 4-level pagetables, so all pud-related
106 * definitions come from <asm-generic/pgtable-nopud.h>.
110 * Finall the top of the hierarchy, the pgd
112 typedef struct { unsigned long pgd; } pgd_t;
113 #define pgd_val(x) ((x).pgd)
114 #define __pgd(x) ((pgd_t) { (x) } )
117 * Manipulate page protection bits
119 typedef struct { unsigned long pgprot; } pgprot_t;
120 #define pgprot_val(x) ((x).pgprot)
121 #define __pgprot(x) ((pgprot_t) { (x) } )
124 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
125 * pair of pages we only have a single global bit per pair of pages. When
126 * writing to the TLB make sure we always have the bit set for both pages
127 * or none. This macro is used to access the `buddy' of the pte we're just
130 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
132 #endif /* !__ASSEMBLY__ */
134 /* to align the pointer to the (next) page boundary */
135 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
137 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
138 #define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
140 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
142 #ifndef CONFIG_NEED_MULTIPLE_NODES
143 #define pfn_valid(pfn) ((pfn) < max_mapnr)
146 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
147 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
149 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
150 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
152 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
153 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
155 #endif /* defined (__KERNEL__) */
157 #ifdef CONFIG_LIMITED_DMA
158 #define WANT_PAGE_VIRTUAL
161 #include <asm-generic/memory_model.h>
162 #include <asm-generic/page.h>
164 #endif /* _ASM_PAGE_H */