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) 1994 - 1999, 2000, 03 Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 */ 9 #ifndef _ASM_PAGE_H 10 #define _ASM_PAGE_H 11 12 #include <spaces.h> 13 14 /* 15 * PAGE_SHIFT determines the page size 16 */ 17 #ifdef CONFIG_PAGE_SIZE_4KB 18 #define PAGE_SHIFT 12 19 #endif 20 #ifdef CONFIG_PAGE_SIZE_8KB 21 #define PAGE_SHIFT 13 22 #endif 23 #ifdef CONFIG_PAGE_SIZE_16KB 24 #define PAGE_SHIFT 14 25 #endif 26 #ifdef CONFIG_PAGE_SIZE_64KB 27 #define PAGE_SHIFT 16 28 #endif 29 #define PAGE_SIZE (1UL << PAGE_SHIFT) 30 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 31 32 #ifndef __ASSEMBLY__ 33 34 #include <linux/pfn.h> 35 #include <asm/io.h> 36 37 extern void build_clear_page(void); 38 extern void build_copy_page(void); 39 40 /* 41 * It's normally defined only for FLATMEM config but it's 42 * used in our early mem init code for all memory models. 43 * So always define it. 44 */ 45 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 46 47 extern void clear_page(void * page); 48 extern void copy_page(void * to, void * from); 49 50 extern unsigned long shm_align_mask; 51 52 static inline unsigned long pages_do_alias(unsigned long addr1, 53 unsigned long addr2) 54 { 55 return (addr1 ^ addr2) & shm_align_mask; 56 } 57 58 struct page; 59 60 static inline void clear_user_page(void *addr, unsigned long vaddr, 61 struct page *page) 62 { 63 extern void (*flush_data_cache_page)(unsigned long addr); 64 65 clear_page(addr); 66 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 67 flush_data_cache_page((unsigned long)addr); 68 } 69 70 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 71 struct page *to); 72 struct vm_area_struct; 73 extern void copy_user_highpage(struct page *to, struct page *from, 74 unsigned long vaddr, struct vm_area_struct *vma); 75 76 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 77 78 /* 79 * These are used to make use of C type-checking.. 80 */ 81 #ifdef CONFIG_64BIT_PHYS_ADDR 82 #ifdef CONFIG_CPU_MIPS32 83 typedef struct { unsigned long pte_low, pte_high; } pte_t; 84 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 85 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 86 #else 87 typedef struct { unsigned long long pte; } pte_t; 88 #define pte_val(x) ((x).pte) 89 #define __pte(x) ((pte_t) { (x) } ) 90 #endif 91 #else 92 typedef struct { unsigned long pte; } pte_t; 93 #define pte_val(x) ((x).pte) 94 #define __pte(x) ((pte_t) { (x) } ) 95 #endif 96 typedef struct page *pgtable_t; 97 98 /* 99 * For 3-level pagetables we defines these ourselves, for 2-level the 100 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 101 */ 102 #ifdef CONFIG_64BIT 103 104 typedef struct { unsigned long pmd; } pmd_t; 105 #define pmd_val(x) ((x).pmd) 106 #define __pmd(x) ((pmd_t) { (x) } ) 107 108 #endif 109 110 /* 111 * Right now we don't support 4-level pagetables, so all pud-related 112 * definitions come from <asm-generic/pgtable-nopud.h>. 113 */ 114 115 /* 116 * Finall the top of the hierarchy, the pgd 117 */ 118 typedef struct { unsigned long pgd; } pgd_t; 119 #define pgd_val(x) ((x).pgd) 120 #define __pgd(x) ((pgd_t) { (x) } ) 121 122 /* 123 * Manipulate page protection bits 124 */ 125 typedef struct { unsigned long pgprot; } pgprot_t; 126 #define pgprot_val(x) ((x).pgprot) 127 #define __pgprot(x) ((pgprot_t) { (x) } ) 128 129 /* 130 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 131 * pair of pages we only have a single global bit per pair of pages. When 132 * writing to the TLB make sure we always have the bit set for both pages 133 * or none. This macro is used to access the `buddy' of the pte we're just 134 * working on. 135 */ 136 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 137 138 #endif /* !__ASSEMBLY__ */ 139 140 /* 141 * __pa()/__va() should be used only during mem init. 142 */ 143 #ifdef CONFIG_64BIT 144 #define __pa(x) \ 145 ({ \ 146 unsigned long __x = (unsigned long)(x); \ 147 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 148 }) 149 #else 150 #define __pa(x) \ 151 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 152 #endif 153 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 154 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 155 156 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 157 158 #ifdef CONFIG_FLATMEM 159 160 #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) 161 162 #elif defined(CONFIG_SPARSEMEM) 163 164 /* pfn_valid is defined in linux/mmzone.h */ 165 166 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 167 168 #define pfn_valid(pfn) \ 169 ({ \ 170 unsigned long __pfn = (pfn); \ 171 int __n = pfn_to_nid(__pfn); \ 172 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 173 NODE_DATA(__n)->node_spanned_pages) \ 174 : 0); \ 175 }) 176 177 #endif 178 179 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 180 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 181 182 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 183 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 184 185 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) 186 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) 187 188 #include <asm-generic/memory_model.h> 189 #include <asm-generic/page.h> 190 191 #endif /* _ASM_PAGE_H */ 192