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 /* fall through */ 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 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 84 85 extern void clear_page(void * page); 86 extern void copy_page(void * to, void * from); 87 88 extern unsigned long shm_align_mask; 89 90 static inline unsigned long pages_do_alias(unsigned long addr1, 91 unsigned long addr2) 92 { 93 return (addr1 ^ addr2) & shm_align_mask; 94 } 95 96 struct page; 97 98 static inline void clear_user_page(void *addr, unsigned long vaddr, 99 struct page *page) 100 { 101 extern void (*flush_data_cache_page)(unsigned long addr); 102 103 clear_page(addr); 104 if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) 105 flush_data_cache_page((unsigned long)addr); 106 } 107 108 struct vm_area_struct; 109 extern void copy_user_highpage(struct page *to, struct page *from, 110 unsigned long vaddr, struct vm_area_struct *vma); 111 112 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 113 114 /* 115 * These are used to make use of C type-checking.. 116 */ 117 #ifdef CONFIG_PHYS_ADDR_T_64BIT 118 #ifdef CONFIG_CPU_MIPS32 119 typedef struct { unsigned long pte_low, pte_high; } pte_t; 120 #define pte_val(x) ((x).pte_low | ((unsigned long long)(x).pte_high << 32)) 121 #define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; }) 122 #else 123 typedef struct { unsigned long long pte; } pte_t; 124 #define pte_val(x) ((x).pte) 125 #define __pte(x) ((pte_t) { (x) } ) 126 #endif 127 #else 128 typedef struct { unsigned long pte; } pte_t; 129 #define pte_val(x) ((x).pte) 130 #define __pte(x) ((pte_t) { (x) } ) 131 #endif 132 typedef struct page *pgtable_t; 133 134 /* 135 * Right now we don't support 4-level pagetables, so all pud-related 136 * definitions come from <asm-generic/pgtable-nopud.h>. 137 */ 138 139 /* 140 * Finall the top of the hierarchy, the pgd 141 */ 142 typedef struct { unsigned long pgd; } pgd_t; 143 #define pgd_val(x) ((x).pgd) 144 #define __pgd(x) ((pgd_t) { (x) } ) 145 146 /* 147 * Manipulate page protection bits 148 */ 149 typedef struct { unsigned long pgprot; } pgprot_t; 150 #define pgprot_val(x) ((x).pgprot) 151 #define __pgprot(x) ((pgprot_t) { (x) } ) 152 153 /* 154 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd 155 * pair of pages we only have a single global bit per pair of pages. When 156 * writing to the TLB make sure we always have the bit set for both pages 157 * or none. This macro is used to access the `buddy' of the pte we're just 158 * working on. 159 */ 160 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 161 162 /* 163 * __pa()/__va() should be used only during mem init. 164 */ 165 static inline unsigned long ___pa(unsigned long x) 166 { 167 if (IS_ENABLED(CONFIG_64BIT)) { 168 /* 169 * For MIPS64 the virtual address may either be in one of 170 * the compatibility segements ckseg0 or ckseg1, or it may 171 * be in xkphys. 172 */ 173 return x < CKSEG0 ? XPHYSADDR(x) : CPHYSADDR(x); 174 } 175 176 if (!IS_ENABLED(CONFIG_EVA)) { 177 /* 178 * We're using the standard MIPS32 legacy memory map, ie. 179 * the address x is going to be in kseg0 or kseg1. We can 180 * handle either case by masking out the desired bits using 181 * CPHYSADDR. 182 */ 183 return CPHYSADDR(x); 184 } 185 186 /* 187 * EVA is in use so the memory map could be anything, making it not 188 * safe to just mask out bits. 189 */ 190 return x - PAGE_OFFSET + PHYS_OFFSET; 191 } 192 #define __pa(x) ___pa((unsigned long)(x)) 193 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 194 #include <asm/io.h> 195 196 /* 197 * RELOC_HIDE was originally added by 6007b903dfe5f1d13e0c711ac2894bdd4a61b1ad 198 * (lmo) rsp. 8431fd094d625b94d364fe393076ccef88e6ce18 (kernel.org). The 199 * discussion can be found in lkml posting 200 * <a2ebde260608230500o3407b108hc03debb9da6e62c@mail.gmail.com> which is 201 * archived at http://lists.linuxcoding.com/kernel/2006-q3/msg17360.html 202 * 203 * It is unclear if the misscompilations mentioned in 204 * http://lkml.org/lkml/2010/8/8/138 also affect MIPS so we keep this one 205 * until GCC 3.x has been retired before we can apply 206 * https://patchwork.linux-mips.org/patch/1541/ 207 */ 208 209 #ifndef __pa_symbol 210 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) 211 #endif 212 213 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 214 215 #ifdef CONFIG_FLATMEM 216 217 static inline int pfn_valid(unsigned long pfn) 218 { 219 /* avoid <linux/mm.h> include hell */ 220 extern unsigned long max_mapnr; 221 unsigned long pfn_offset = ARCH_PFN_OFFSET; 222 223 return pfn >= pfn_offset && pfn < max_mapnr; 224 } 225 226 #elif defined(CONFIG_SPARSEMEM) 227 228 /* pfn_valid is defined in linux/mmzone.h */ 229 230 #elif defined(CONFIG_NEED_MULTIPLE_NODES) 231 232 #define pfn_valid(pfn) \ 233 ({ \ 234 unsigned long __pfn = (pfn); \ 235 int __n = pfn_to_nid(__pfn); \ 236 ((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \ 237 NODE_DATA(__n)->node_spanned_pages) \ 238 : 0); \ 239 }) 240 241 #endif 242 243 #define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr))) 244 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 245 246 extern int __virt_addr_valid(const volatile void *kaddr); 247 #define virt_addr_valid(kaddr) \ 248 __virt_addr_valid((const volatile void *) (kaddr)) 249 250 #define VM_DATA_DEFAULT_FLAGS \ 251 (VM_READ | VM_WRITE | \ 252 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ 253 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 254 255 #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) 256 #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) 257 258 #include <asm-generic/memory_model.h> 259 #include <asm-generic/getorder.h> 260 261 #endif /* _ASM_PAGE_H */ 262