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 (~(PAGE_SIZE - 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 #include <asm/io.h> 50 51 extern void build_clear_page(void); 52 extern void build_copy_page(void); 53 54 /* 55 * It's normally defined only for FLATMEM config but it's 56 * used in our early mem init code for all memory models. 57 * So always define it. 58 */ 59 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 60 61 extern void clear_page(void * page); 62 extern void copy_page(void * to, void * from); 63 64 extern unsigned long shm_align_mask; 65 66 static inline unsigned long pages_do_alias(unsigned long addr1, 67 unsigned long addr2) 68 { 69 return (addr1 ^ addr2) & shm_align_mask; 70 } 71 72 struct page; 73 74 static inline void clear_user_page(void *addr, unsigned long vaddr, 75 struct page *page) 76 { 77 extern void (*flush_data_cache_page)(unsigned long addr); 78 79 clear_page(addr); 80 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 81 flush_data_cache_page((unsigned long)addr); 82 } 83 84 extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr, 85 struct page *to); 86 struct vm_area_struct; 87 extern void copy_user_highpage(struct page *to, struct page *from, 88 unsigned long vaddr, struct vm_area_struct *vma); 89 90 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 91 92 /* 93 * These are used to make use of C type-checking.. 94 */ 95 #ifdef CONFIG_64BIT_PHYS_ADDR 96 #ifdef CONFIG_CPU_MIPS32 97 typedef struct { unsigned long pte_low, pte_high; } pte_t; 98 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 99 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 100 #else 101 typedef struct { unsigned long long pte; } pte_t; 102 #define pte_val(x) ((x).pte) 103 #define __pte(x) ((pte_t) { (x) } ) 104 #endif 105 #else 106 typedef struct { unsigned long pte; } pte_t; 107 #define pte_val(x) ((x).pte) 108 #define __pte(x) ((pte_t) { (x) } ) 109 #endif 110 typedef struct page *pgtable_t; 111 112 /* 113 * Right now we don't support 4-level pagetables, so all pud-related 114 * definitions come from <asm-generic/pgtable-nopud.h>. 115 */ 116 117 /* 118 * Finall the top of the hierarchy, the pgd 119 */ 120 typedef struct { unsigned long pgd; } pgd_t; 121 #define pgd_val(x) ((x).pgd) 122 #define __pgd(x) ((pgd_t) { (x) } ) 123 124 /* 125 * Manipulate page protection bits 126 */ 127 typedef struct { unsigned long pgprot; } pgprot_t; 128 #define pgprot_val(x) ((x).pgprot) 129 #define __pgprot(x) ((pgprot_t) { (x) } ) 130 131 /* 132 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 133 * pair of pages we only have a single global bit per pair of pages. When 134 * writing to the TLB make sure we always have the bit set for both pages 135 * or none. This macro is used to access the `buddy' of the pte we're just 136 * working on. 137 */ 138 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 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)) 154 155 /* 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 #define pfn_valid(pfn) \ 175 ({ \ 176 unsigned long __pfn = (pfn); \ 177 /* avoid <linux/bootmem.h> include hell */ \ 178 extern unsigned long min_low_pfn; \ 179 \ 180 __pfn >= min_low_pfn && __pfn < max_mapnr; \ 181 }) 182 183 #elif defined(CONFIG_SPARSEMEM) 184 185 /* pfn_valid is defined in linux/mmzone.h */ 186 187 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 188 189 #define pfn_valid(pfn) \ 190 ({ \ 191 unsigned long __pfn = (pfn); \ 192 int __n = pfn_to_nid(__pfn); \ 193 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 194 NODE_DATA(__n)->node_spanned_pages) \ 195 : 0); \ 196 }) 197 198 #endif 199 200 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr))) 201 202 extern int __virt_addr_valid(const volatile void *kaddr); 203 #define virt_addr_valid(kaddr) \ 204 __virt_addr_valid((const volatile void *) (kaddr)) 205 206 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 207 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 208 209 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE + \ 210 PHYS_OFFSET) 211 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET - \ 212 PHYS_OFFSET) 213 214 #include <asm-generic/memory_model.h> 215 #include <asm-generic/getorder.h> 216 217 #endif /* _ASM_PAGE_H */ 218