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