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 #include <linux/kernel.h> 15 #include <asm/mipsregs.h> 16 17 /* 18 * PAGE_SHIFT determines the page size 19 */ 20 #ifdef CONFIG_PAGE_SIZE_4KB 21 #define PAGE_SHIFT 12 22 #endif 23 #ifdef CONFIG_PAGE_SIZE_8KB 24 #define PAGE_SHIFT 13 25 #endif 26 #ifdef CONFIG_PAGE_SIZE_16KB 27 #define PAGE_SHIFT 14 28 #endif 29 #ifdef CONFIG_PAGE_SIZE_32KB 30 #define PAGE_SHIFT 15 31 #endif 32 #ifdef CONFIG_PAGE_SIZE_64KB 33 #define PAGE_SHIFT 16 34 #endif 35 #define PAGE_SIZE (_AC(1,UL) << PAGE_SHIFT) 36 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 37 38 /* 39 * This is used for calculating the real page sizes 40 * for FTLB or VTLB + FTLB configurations. 41 */ 42 static inline unsigned int page_size_ftlb(unsigned int mmuextdef) 43 { 44 switch (mmuextdef) { 45 case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT: 46 if (PAGE_SIZE == (1 << 30)) 47 return 5; 48 if (PAGE_SIZE == (1llu << 32)) 49 return 6; 50 if (PAGE_SIZE > (256 << 10)) 51 return 7; /* reserved */ 52 fallthrough; 53 case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT: 54 return (PAGE_SHIFT - 10) / 2; 55 default: 56 panic("Invalid FTLB configuration with Conf4_mmuextdef=%d value\n", 57 mmuextdef >> 14); 58 } 59 } 60 61 #ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT 62 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 63 #define HPAGE_SIZE (_AC(1,UL) << HPAGE_SHIFT) 64 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 65 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 66 #else /* !CONFIG_MIPS_HUGE_TLB_SUPPORT */ 67 #define HPAGE_SHIFT ({BUILD_BUG(); 0; }) 68 #define HPAGE_SIZE ({BUILD_BUG(); 0; }) 69 #define HPAGE_MASK ({BUILD_BUG(); 0; }) 70 #define HUGETLB_PAGE_ORDER ({BUILD_BUG(); 0; }) 71 #endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */ 72 73 #include <linux/pfn.h> 74 75 extern void build_clear_page(void); 76 extern void build_copy_page(void); 77 78 /* 79 * It's normally defined only for FLATMEM config but it's 80 * used in our early mem init code for all memory models. 81 * So always define it. 82 */ 83 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 84 extern unsigned long ARCH_PFN_OFFSET; 85 # define ARCH_PFN_OFFSET ARCH_PFN_OFFSET 86 #else 87 # define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 88 #endif 89 90 extern void clear_page(void * page); 91 extern void copy_page(void * to, void * from); 92 93 extern unsigned long shm_align_mask; 94 95 static inline unsigned long pages_do_alias(unsigned long addr1, 96 unsigned long addr2) 97 { 98 return (addr1 ^ addr2) & shm_align_mask; 99 } 100 101 struct page; 102 103 static inline void clear_user_page(void *addr, unsigned long vaddr, 104 struct page *page) 105 { 106 extern void (*flush_data_cache_page)(unsigned long addr); 107 108 clear_page(addr); 109 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 110 flush_data_cache_page((unsigned long)addr); 111 } 112 113 struct vm_area_struct; 114 extern void copy_user_highpage(struct page *to, struct page *from, 115 unsigned long vaddr, struct vm_area_struct *vma); 116 117 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 118 119 /* 120 * These are used to make use of C type-checking.. 121 */ 122 #ifdef CONFIG_PHYS_ADDR_T_64BIT 123 #ifdef CONFIG_CPU_MIPS32 124 typedef struct { unsigned long pte_low, pte_high; } pte_t; 125 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 126 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 127 #else 128 typedef struct { unsigned long long pte; } pte_t; 129 #define pte_val(x) ((x).pte) 130 #define __pte(x) ((pte_t) { (x) } ) 131 #endif 132 #else 133 typedef struct { unsigned long pte; } pte_t; 134 #define pte_val(x) ((x).pte) 135 #define __pte(x) ((pte_t) { (x) } ) 136 #endif 137 typedef struct page *pgtable_t; 138 139 /* 140 * Right now we don't support 4-level pagetables, so all pud-related 141 * definitions come from <asm-generic/pgtable-nopud.h>. 142 */ 143 144 /* 145 * Finall the top of the hierarchy, the pgd 146 */ 147 typedef struct { unsigned long pgd; } pgd_t; 148 #define pgd_val(x) ((x).pgd) 149 #define __pgd(x) ((pgd_t) { (x) } ) 150 151 /* 152 * Manipulate page protection bits 153 */ 154 typedef struct { unsigned long pgprot; } pgprot_t; 155 #define pgprot_val(x) ((x).pgprot) 156 #define __pgprot(x) ((pgprot_t) { (x) } ) 157 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK) 158 159 /* 160 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 161 * pair of pages we only have a single global bit per pair of pages. When 162 * writing to the TLB make sure we always have the bit set for both pages 163 * or none. This macro is used to access the `buddy' of the pte we're just 164 * working on. 165 */ 166 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 167 168 /* 169 * __pa()/__va() should be used only during mem init. 170 */ 171 static inline unsigned long ___pa(unsigned long x) 172 { 173 if (IS_ENABLED(CONFIG_64BIT)) { 174 /* 175 * For MIPS64 the virtual address may either be in one of 176 * the compatibility segements ckseg0 or ckseg1, or it may 177 * be in xkphys. 178 */ 179 return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x); 180 } 181 182 if (!IS_ENABLED(CONFIG_EVA)) { 183 /* 184 * We're using the standard MIPS32 legacy memory map, ie. 185 * the address x is going to be in kseg0 or kseg1. We can 186 * handle either case by masking out the desired bits using 187 * CPHYSADDR. 188 */ 189 return CPHYSADDR(x); 190 } 191 192 /* 193 * EVA is in use so the memory map could be anything, making it not 194 * safe to just mask out bits. 195 */ 196 return x - PAGE_OFFSET + PHYS_OFFSET; 197 } 198 #define __pa(x) ___pa((unsigned long)(x)) 199 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 200 #include <asm/io.h> 201 202 /* 203 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad 204 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The 205 * discussion can be found in 206 * https://lore.kernel.org/lkml/a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com 207 * 208 * It is unclear if the misscompilations mentioned in 209 * https://lore.kernel.org/lkml/1281303490-390-1-git-send-email-namhyung@gmail.com 210 * also affect MIPS so we keep this one until GCC 3.x has been retired 211 * before we can apply https://patchwork.linux-mips.org/patch/1541/ 212 */ 213 #define __pa_symbol_nodebug(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 214 215 #ifdef CONFIG_DEBUG_VIRTUAL 216 extern phys_addr_t __phys_addr_symbol(unsigned long x); 217 #else 218 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 219 #endif 220 221 #ifndef __pa_symbol 222 #define __pa_symbol(x) __phys_addr_symbol((unsigned long)(x)) 223 #endif 224 225 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 226 227 #ifdef CONFIG_FLATMEM 228 229 static inline int pfn_valid(unsigned long pfn) 230 { 231 /* avoid <linux/mm.h> include hell */ 232 extern unsigned long max_mapnr; 233 unsigned long pfn_offset = ARCH_PFN_OFFSET; 234 235 return pfn >= pfn_offset && pfn < max_mapnr; 236 } 237 238 #elif defined(CONFIG_SPARSEMEM) 239 240 /* pfn_valid is defined in linux/mmzone.h */ 241 242 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 243 244 #define pfn_valid(pfn) \ 245 ({ \ 246 unsigned long __pfn = (pfn); \ 247 int __n = pfn_to_nid(__pfn); \ 248 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 249 NODE_DATA(__n)->node_spanned_pages) \ 250 : 0); \ 251 }) 252 253 #endif 254 255 #define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr))) 256 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 257 258 extern bool __virt_addr_valid(const volatile void *kaddr); 259 #define virt_addr_valid(kaddr) \ 260 __virt_addr_valid((const volatile void *) (kaddr)) 261 262 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_TSK_EXEC 263 264 extern unsigned long __kaslr_offset; 265 static inline unsigned long kaslr_offset(void) 266 { 267 return __kaslr_offset; 268 } 269 270 #include <asm-generic/memory_model.h> 271 #include <asm-generic/getorder.h> 272 273 #endif /* _ASM_PAGE_H */ 274