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