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_32KB 27 #define PAGE_SHIFT 15 28 #endif 29 #ifdef CONFIG_PAGE_SIZE_64KB 30 #define PAGE_SHIFT 16 31 #endif 32 #define PAGE_SIZE (1UL << PAGE_SHIFT) 33 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 34 35 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 36 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) 37 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 38 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 39 40 #ifndef __ASSEMBLY__ 41 42 #include <linux/pfn.h> 43 #include <asm/io.h> 44 45 extern void build_clear_page(void); 46 extern void build_copy_page(void); 47 48 /* 49 * It's normally defined only for FLATMEM config but it's 50 * used in our early mem init code for all memory models. 51 * So always define it. 52 */ 53 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 54 55 extern void clear_page(void * page); 56 extern void copy_page(void * to, void * from); 57 58 extern unsigned long shm_align_mask; 59 60 static inline unsigned long pages_do_alias(unsigned long addr1, 61 unsigned long addr2) 62 { 63 return (addr1 ^ addr2) & shm_align_mask; 64 } 65 66 struct page; 67 68 static inline void clear_user_page(void *addr, unsigned long vaddr, 69 struct page *page) 70 { 71 extern void (*flush_data_cache_page)(unsigned long addr); 72 73 clear_page(addr); 74 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 75 flush_data_cache_page((unsigned long)addr); 76 } 77 78 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 79 struct page *to); 80 struct vm_area_struct; 81 extern void copy_user_highpage(struct page *to, struct page *from, 82 unsigned long vaddr, struct vm_area_struct *vma); 83 84 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 85 86 /* 87 * These are used to make use of C type-checking.. 88 */ 89 #ifdef CONFIG_64BIT_PHYS_ADDR 90 #ifdef CONFIG_CPU_MIPS32 91 typedef struct { unsigned long pte_low, pte_high; } pte_t; 92 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 93 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 94 #else 95 typedef struct { unsigned long long pte; } pte_t; 96 #define pte_val(x) ((x).pte) 97 #define __pte(x) ((pte_t) { (x) } ) 98 #endif 99 #else 100 typedef struct { unsigned long pte; } pte_t; 101 #define pte_val(x) ((x).pte) 102 #define __pte(x) ((pte_t) { (x) } ) 103 #endif 104 typedef struct page *pgtable_t; 105 106 /* 107 * For 3-level pagetables we defines these ourselves, for 2-level the 108 * definitions are supplied by <asm-generic/pgtable-nopmd.h>. 109 */ 110 #ifdef CONFIG_64BIT 111 112 typedef struct { unsigned long pmd; } pmd_t; 113 #define pmd_val(x) ((x).pmd) 114 #define __pmd(x) ((pmd_t) { (x) } ) 115 116 #endif 117 118 /* 119 * Right now we don't support 4-level pagetables, so all pud-related 120 * definitions come from <asm-generic/pgtable-nopud.h>. 121 */ 122 123 /* 124 * Finall the top of the hierarchy, the pgd 125 */ 126 typedef struct { unsigned long pgd; } pgd_t; 127 #define pgd_val(x) ((x).pgd) 128 #define __pgd(x) ((pgd_t) { (x) } ) 129 130 /* 131 * Manipulate page protection bits 132 */ 133 typedef struct { unsigned long pgprot; } pgprot_t; 134 #define pgprot_val(x) ((x).pgprot) 135 #define __pgprot(x) ((pgprot_t) { (x) } ) 136 137 /* 138 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 139 * pair of pages we only have a single global bit per pair of pages. When 140 * writing to the TLB make sure we always have the bit set for both pages 141 * or none. This macro is used to access the `buddy' of the pte we're just 142 * working on. 143 */ 144 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 145 146 #endif /* !__ASSEMBLY__ */ 147 148 /* 149 * __pa()/__va() should be used only during mem init. 150 */ 151 #ifdef CONFIG_64BIT 152 #define __pa(x) \ 153 ({ \ 154 unsigned long __x = (unsigned long)(x); \ 155 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 156 }) 157 #else 158 #define __pa(x) \ 159 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 160 #endif 161 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 162 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 163 164 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 165 166 #ifdef CONFIG_FLATMEM 167 168 #define pfn_valid(pfn) \ 169 ({ \ 170 unsigned long __pfn = (pfn); \ 171 /* avoid <linux/bootmem.h> include hell */ \ 172 extern unsigned long min_low_pfn; \ 173 \ 174 __pfn >= min_low_pfn && __pfn < max_mapnr; \ 175 }) 176 177 #elif defined(CONFIG_SPARSEMEM) 178 179 /* pfn_valid is defined in linux/mmzone.h */ 180 181 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 182 183 #define pfn_valid(pfn) \ 184 ({ \ 185 unsigned long __pfn = (pfn); \ 186 int __n = pfn_to_nid(__pfn); \ 187 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 188 NODE_DATA(__n)->node_spanned_pages) \ 189 : 0); \ 190 }) 191 192 #endif 193 194 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 195 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 196 197 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 198 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 199 200 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) 201 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) 202 203 #include <asm-generic/memory_model.h> 204 #include <asm-generic/getorder.h> 205 206 #endif /* _ASM_PAGE_H */ 207