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 #else /* !CONFIG_HUGETLB_PAGE */ 42 # ifndef BUILD_BUG 43 # define BUILD_BUG() do { extern void __build_bug(void); __build_bug(); } while (0) 44 # endif 45 #define HPAGE_SHIFT ({BUILD_BUG(); 0; }) 46 #define HPAGE_SIZE ({BUILD_BUG(); 0; }) 47 #define HPAGE_MASK ({BUILD_BUG(); 0; }) 48 #define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; }) 49 #endif /* CONFIG_HUGETLB_PAGE */ 50 51 #ifndef __ASSEMBLY__ 52 53 #include <linux/pfn.h> 54 #include <asm/io.h> 55 56 extern void build_clear_page(void); 57 extern void build_copy_page(void); 58 59 /* 60 * It's normally defined only for FLATMEM config but it's 61 * used in our early mem init code for all memory models. 62 * So always define it. 63 */ 64 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 65 66 extern void clear_page(void * page); 67 extern void copy_page(void * to, void * from); 68 69 extern unsigned long shm_align_mask; 70 71 static inline unsigned long pages_do_alias(unsigned long addr1, 72 unsigned long addr2) 73 { 74 return (addr1 ^ addr2) & shm_align_mask; 75 } 76 77 struct page; 78 79 static inline void clear_user_page(void *addr, unsigned long vaddr, 80 struct page *page) 81 { 82 extern void (*flush_data_cache_page)(unsigned long addr); 83 84 clear_page(addr); 85 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 86 flush_data_cache_page((unsigned long)addr); 87 } 88 89 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 90 struct page *to); 91 struct vm_area_struct; 92 extern void copy_user_highpage(struct page *to, struct page *from, 93 unsigned long vaddr, struct vm_area_struct *vma); 94 95 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 96 97 /* 98 * These are used to make use of C type-checking.. 99 */ 100 #ifdef CONFIG_64BIT_PHYS_ADDR 101 #ifdef CONFIG_CPU_MIPS32 102 typedef struct { unsigned long pte_low, pte_high; } pte_t; 103 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 104 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 105 #else 106 typedef struct { unsigned long long pte; } pte_t; 107 #define pte_val(x) ((x).pte) 108 #define __pte(x) ((pte_t) { (x) } ) 109 #endif 110 #else 111 typedef struct { unsigned long pte; } pte_t; 112 #define pte_val(x) ((x).pte) 113 #define __pte(x) ((pte_t) { (x) } ) 114 #endif 115 typedef struct page *pgtable_t; 116 117 /* 118 * Right now we don't support 4-level pagetables, so all pud-related 119 * definitions come from <asm-generic/pgtable-nopud.h>. 120 */ 121 122 /* 123 * Finall the top of the hierarchy, the pgd 124 */ 125 typedef struct { unsigned long pgd; } pgd_t; 126 #define pgd_val(x) ((x).pgd) 127 #define __pgd(x) ((pgd_t) { (x) } ) 128 129 /* 130 * Manipulate page protection bits 131 */ 132 typedef struct { unsigned long pgprot; } pgprot_t; 133 #define pgprot_val(x) ((x).pgprot) 134 #define __pgprot(x) ((pgprot_t) { (x) } ) 135 136 /* 137 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 138 * pair of pages we only have a single global bit per pair of pages. When 139 * writing to the TLB make sure we always have the bit set for both pages 140 * or none. This macro is used to access the `buddy' of the pte we're just 141 * working on. 142 */ 143 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 144 145 #endif /* !__ASSEMBLY__ */ 146 147 /* 148 * __pa()/__va() should be used only during mem init. 149 */ 150 #ifdef CONFIG_64BIT 151 #define __pa(x) \ 152 ({ \ 153 unsigned long __x = (unsigned long)(x); \ 154 __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \ 155 }) 156 #else 157 #define __pa(x) \ 158 ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 159 #endif 160 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 161 162 /* 163 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad 164 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The 165 * discussion can be found in lkml posting 166 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is 167 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html 168 * 169 * It is unclear if the misscompilations mentioned in 170 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one 171 * until GCC 3.x has been retired before we can apply 172 * https://patchwork.linux-mips.org/patch/1541/ 173 */ 174 175 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 176 177 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 178 179 #ifdef CONFIG_FLATMEM 180 181 #define pfn_valid(pfn) \ 182 ({ \ 183 unsigned long __pfn = (pfn); \ 184 /* avoid <linux/bootmem.h> include hell */ \ 185 extern unsigned long min_low_pfn; \ 186 \ 187 __pfn >= min_low_pfn && __pfn < max_mapnr; \ 188 }) 189 190 #elif defined(CONFIG_SPARSEMEM) 191 192 /* pfn_valid is defined in linux/mmzone.h */ 193 194 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 195 196 #define pfn_valid(pfn) \ 197 ({ \ 198 unsigned long __pfn = (pfn); \ 199 int __n = pfn_to_nid(__pfn); \ 200 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 201 NODE_DATA(__n)->node_spanned_pages) \ 202 : 0); \ 203 }) 204 205 #endif 206 207 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 208 #define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr))) 209 210 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 211 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 212 213 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE + \ 214 PHYS_OFFSET) 215 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET - \ 216 PHYS_OFFSET) 217 218 #include <asm-generic/memory_model.h> 219 #include <asm-generic/getorder.h> 220 221 #endif /* _ASM_PAGE_H */ 222