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 #include <linux/const.h> 14 15 /* 16 * PAGE_SHIFT determines the page size 17 */ 18 #ifdef CONFIG_PAGE_SIZE_4KB 19 #define PAGE_SHIFT 12 20 #endif 21 #ifdef CONFIG_PAGE_SIZE_8KB 22 #define PAGE_SHIFT 13 23 #endif 24 #ifdef CONFIG_PAGE_SIZE_16KB 25 #define PAGE_SHIFT 14 26 #endif 27 #ifdef CONFIG_PAGE_SIZE_32KB 28 #define PAGE_SHIFT 15 29 #endif 30 #ifdef CONFIG_PAGE_SIZE_64KB 31 #define PAGE_SHIFT 16 32 #endif 33 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) 34 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 35 36 #ifdef CONFIG_HUGETLB_PAGE 37 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 38 #define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) 39 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 40 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 41 #endif /* CONFIG_HUGETLB_PAGE */ 42 43 #ifndef __ASSEMBLY__ 44 45 #include <linux/pfn.h> 46 #include <asm/io.h> 47 48 extern void build_clear_page(void); 49 extern void build_copy_page(void); 50 51 /* 52 * It's normally defined only for FLATMEM config but it's 53 * used in our early mem init code for all memory models. 54 * So always define it. 55 */ 56 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 57 58 extern void clear_page(void * page); 59 extern void copy_page(void * to, void * from); 60 61 extern unsigned long shm_align_mask; 62 63 static inline unsigned long pages_do_alias(unsigned long addr1, 64 unsigned long addr2) 65 { 66 return (addr1 ^ addr2) & shm_align_mask; 67 } 68 69 struct page; 70 71 static inline void clear_user_page(void *addr, unsigned long vaddr, 72 struct page *page) 73 { 74 extern void (*flush_data_cache_page)(unsigned long addr); 75 76 clear_page(addr); 77 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 78 flush_data_cache_page((unsigned long)addr); 79 } 80 81 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 82 struct page *to); 83 struct vm_area_struct; 84 extern void copy_user_highpage(struct page *to, struct page *from, 85 unsigned long vaddr, struct vm_area_struct *vma); 86 87 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 88 89 /* 90 * These are used to make use of C type-checking.. 91 */ 92 #ifdef CONFIG_64BIT_PHYS_ADDR 93 #ifdef CONFIG_CPU_MIPS32 94 typedef struct { unsigned long pte_low, pte_high; } pte_t; 95 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 96 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 97 #else 98 typedef struct { unsigned long long pte; } pte_t; 99 #define pte_val(x) ((x).pte) 100 #define __pte(x) ((pte_t) { (x) } ) 101 #endif 102 #else 103 typedef struct { unsigned long pte; } pte_t; 104 #define pte_val(x) ((x).pte) 105 #define __pte(x) ((pte_t) { (x) } ) 106 #endif 107 typedef struct page *pgtable_t; 108 109 /* 110 * Right now we don't support 4-level pagetables, so all pud-related 111 * definitions come from <asm-generic/pgtable-nopud.h>. 112 */ 113 114 /* 115 * Finall the top of the hierarchy, the pgd 116 */ 117 typedef struct { unsigned long pgd; } pgd_t; 118 #define pgd_val(x) ((x).pgd) 119 #define __pgd(x) ((pgd_t) { (x) } ) 120 121 /* 122 * Manipulate page protection bits 123 */ 124 typedef struct { unsigned long pgprot; } pgprot_t; 125 #define pgprot_val(x) ((x).pgprot) 126 #define __pgprot(x) ((pgprot_t) { (x) } ) 127 128 /* 129 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 130 * pair of pages we only have a single global bit per pair of pages. When 131 * writing to the TLB make sure we always have the bit set for both pages 132 * or none. This macro is used to access the `buddy' of the pte we're just 133 * working on. 134 */ 135 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 136 137 #endif /* !__ASSEMBLY__ */ 138 139 /* 140 * __pa()/__va() should be used only during mem init. 141 */ 142 #ifdef CONFIG_64BIT 143 #define __pa(x) \ 144 ({ \ 145 unsigned long __x = (unsigned long)(x); \ 146 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 147 }) 148 #else 149 #define __pa(x) \ 150 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 151 #endif 152 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 153 154 /* 155 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad 156 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The 157 * discussion can be found in lkml posting 158 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is 159 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html 160 * 161 * It is unclear if the misscompilations mentioned in 162 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one 163 * until GCC 3.x has been retired before we can apply 164 * https://patchwork.linux-mips.org/patch/1541/ 165 */ 166 167 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 168 169 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 170 171 #ifdef CONFIG_FLATMEM 172 173 #define pfn_valid(pfn) \ 174 ({ \ 175 unsigned long __pfn = (pfn); \ 176 /* avoid <linux/bootmem.h> include hell */ \ 177 extern unsigned long min_low_pfn; \ 178 \ 179 __pfn >= min_low_pfn && __pfn < max_mapnr; \ 180 }) 181 182 #elif defined(CONFIG_SPARSEMEM) 183 184 /* pfn_valid is defined in linux/mmzone.h */ 185 186 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 187 188 #define pfn_valid(pfn) \ 189 ({ \ 190 unsigned long __pfn = (pfn); \ 191 int __n = pfn_to_nid(__pfn); \ 192 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 193 NODE_DATA(__n)->node_spanned_pages) \ 194 : 0); \ 195 }) 196 197 #endif 198 199 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 200 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 201 202 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 203 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 204 205 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE + \ 206 PHYS_OFFSET) 207 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET - \ 208 PHYS_OFFSET) 209 210 #include <asm-generic/memory_model.h> 211 #include <asm-generic/getorder.h> 212 213 #endif /* _ASM_PAGE_H */ 214