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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 | /* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Copyright 2003 PathScale, Inc. * Derived from include/asm-i386/pgtable.h */ #ifndef __UM_PGTABLE_H #define __UM_PGTABLE_H #include <asm/fixmap.h> #define _PAGE_PRESENT 0x001 #define _PAGE_NEWPAGE 0x002 #define _PAGE_NEWPROT 0x004 #define _PAGE_RW 0x020 #define _PAGE_USER 0x040 #define _PAGE_ACCESSED 0x080 #define _PAGE_DIRTY 0x100 /* If _PAGE_PRESENT is clear, we use these: */ #define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE; pte_present gives true */ #ifdef CONFIG_3_LEVEL_PGTABLES #include <asm/pgtable-3level.h> #else #include <asm/pgtable-2level.h> #endif extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* zero page used for uninitialized stuff */ extern unsigned long *empty_zero_page; /* Just any arbitrary offset to the start of the vmalloc VM area: the * current 8MB value just means that there will be a 8MB "hole" after the * physical memory until the kernel virtual memory starts. That means that * any out-of-bounds memory accesses will hopefully be caught. * The vmalloc() routines leaves a hole of 4kB between each vmalloced * area for the same reason. ;) */ extern unsigned long end_iomem; #define VMALLOC_OFFSET (__va_space) #define VMALLOC_START ((end_iomem + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)) #define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK) #define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) #define MODULES_VADDR VMALLOC_START #define MODULES_END VMALLOC_END #define MODULES_LEN (MODULES_VADDR - MODULES_END) #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY) #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY) #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) #define __PAGE_KERNEL_EXEC \ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED) #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED) #define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC) /* * The i386 can't do page protection for execute, and considers that the same * are read. * Also, write permissions imply read permissions. This is the closest we can * get.. */ #define __P000 PAGE_NONE #define __P001 PAGE_READONLY #define __P010 PAGE_COPY #define __P011 PAGE_COPY #define __P100 PAGE_READONLY #define __P101 PAGE_READONLY #define __P110 PAGE_COPY #define __P111 PAGE_COPY #define __S000 PAGE_NONE #define __S001 PAGE_READONLY #define __S010 PAGE_SHARED #define __S011 PAGE_SHARED #define __S100 PAGE_READONLY #define __S101 PAGE_READONLY #define __S110 PAGE_SHARED #define __S111 PAGE_SHARED /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ #define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page) #define pte_clear(mm,addr,xp) pte_set_val(*(xp), (phys_t) 0, __pgprot(_PAGE_NEWPAGE)) #define pmd_none(x) (!((unsigned long)pmd_val(x) & ~_PAGE_NEWPAGE)) #define pmd_bad(x) ((pmd_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) #define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT) #define pmd_clear(xp) do { pmd_val(*(xp)) = _PAGE_NEWPAGE; } while (0) #define pmd_newpage(x) (pmd_val(x) & _PAGE_NEWPAGE) #define pmd_mkuptodate(x) (pmd_val(x) &= ~_PAGE_NEWPAGE) #define pud_newpage(x) (pud_val(x) & _PAGE_NEWPAGE) #define pud_mkuptodate(x) (pud_val(x) &= ~_PAGE_NEWPAGE) #define p4d_newpage(x) (p4d_val(x) & _PAGE_NEWPAGE) #define p4d_mkuptodate(x) (p4d_val(x) &= ~_PAGE_NEWPAGE) #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT) #define pmd_page(pmd) phys_to_page(pmd_val(pmd) & PAGE_MASK) #define pte_page(x) pfn_to_page(pte_pfn(x)) #define pte_present(x) pte_get_bits(x, (_PAGE_PRESENT | _PAGE_PROTNONE)) /* * ================================= * Flags checking section. * ================================= */ static inline int pte_none(pte_t pte) { return pte_is_zero(pte); } /* * The following only work if pte_present() is true. * Undefined behaviour if not.. */ static inline int pte_read(pte_t pte) { return((pte_get_bits(pte, _PAGE_USER)) && !(pte_get_bits(pte, _PAGE_PROTNONE))); } static inline int pte_exec(pte_t pte){ return((pte_get_bits(pte, _PAGE_USER)) && !(pte_get_bits(pte, _PAGE_PROTNONE))); } static inline int pte_write(pte_t pte) { return((pte_get_bits(pte, _PAGE_RW)) && !(pte_get_bits(pte, _PAGE_PROTNONE))); } static inline int pte_dirty(pte_t pte) { return pte_get_bits(pte, _PAGE_DIRTY); } static inline int pte_young(pte_t pte) { return pte_get_bits(pte, _PAGE_ACCESSED); } static inline int pte_newpage(pte_t pte) { return pte_get_bits(pte, _PAGE_NEWPAGE); } static inline int pte_newprot(pte_t pte) { return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT))); } /* * ================================= * Flags setting section. * ================================= */ static inline pte_t pte_mknewprot(pte_t pte) { pte_set_bits(pte, _PAGE_NEWPROT); return(pte); } static inline pte_t pte_mkclean(pte_t pte) { pte_clear_bits(pte, _PAGE_DIRTY); return(pte); } static inline pte_t pte_mkold(pte_t pte) { pte_clear_bits(pte, _PAGE_ACCESSED); return(pte); } static inline pte_t pte_wrprotect(pte_t pte) { if (likely(pte_get_bits(pte, _PAGE_RW))) pte_clear_bits(pte, _PAGE_RW); else return pte; return(pte_mknewprot(pte)); } static inline pte_t pte_mkread(pte_t pte) { if (unlikely(pte_get_bits(pte, _PAGE_USER))) return pte; pte_set_bits(pte, _PAGE_USER); return(pte_mknewprot(pte)); } static inline pte_t pte_mkdirty(pte_t pte) { pte_set_bits(pte, _PAGE_DIRTY); return(pte); } static inline pte_t pte_mkyoung(pte_t pte) { pte_set_bits(pte, _PAGE_ACCESSED); return(pte); } static inline pte_t pte_mkwrite(pte_t pte) { if (unlikely(pte_get_bits(pte, _PAGE_RW))) return pte; pte_set_bits(pte, _PAGE_RW); return(pte_mknewprot(pte)); } static inline pte_t pte_mkuptodate(pte_t pte) { pte_clear_bits(pte, _PAGE_NEWPAGE); if(pte_present(pte)) pte_clear_bits(pte, _PAGE_NEWPROT); return(pte); } static inline pte_t pte_mknewpage(pte_t pte) { pte_set_bits(pte, _PAGE_NEWPAGE); return(pte); } static inline void set_pte(pte_t *pteptr, pte_t pteval) { pte_copy(*pteptr, pteval); /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so * fix_range knows to unmap it. _PAGE_NEWPROT is specific to * mapped pages. */ *pteptr = pte_mknewpage(*pteptr); if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr); } static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *pteptr, pte_t pteval) { set_pte(pteptr, pteval); } #define __HAVE_ARCH_PTE_SAME static inline int pte_same(pte_t pte_a, pte_t pte_b) { return !((pte_val(pte_a) ^ pte_val(pte_b)) & ~_PAGE_NEWPAGE); } /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ #define phys_to_page(phys) pfn_to_page(phys_to_pfn(phys)) #define __virt_to_page(virt) phys_to_page(__pa(virt)) #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) #define virt_to_page(addr) __virt_to_page((const unsigned long) addr) #define mk_pte(page, pgprot) \ ({ pte_t pte; \ \ pte_set_val(pte, page_to_phys(page), (pgprot)); \ if (pte_present(pte)) \ pte_mknewprot(pte_mknewpage(pte)); \ pte;}) static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) { pte_set_val(pte, (pte_val(pte) & _PAGE_CHG_MASK), newprot); return pte; } /* * the pmd page can be thought of an array like this: pmd_t[PTRS_PER_PMD] * * this macro returns the index of the entry in the pmd page which would * control the given virtual address */ #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) struct mm_struct; extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); #define update_mmu_cache(vma,address,ptep) do {} while (0) /* Encode and de-code a swap entry */ #define __swp_type(x) (((x).val >> 5) & 0x1f) #define __swp_offset(x) ((x).val >> 11) #define __swp_entry(type, offset) \ ((swp_entry_t) { ((type) << 5) | ((offset) << 11) }) #define __pte_to_swp_entry(pte) \ ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) #define kern_addr_valid(addr) (1) /* Clear a kernel PTE and flush it from the TLB */ #define kpte_clear_flush(ptep, vaddr) \ do { \ pte_clear(&init_mm, (vaddr), (ptep)); \ __flush_tlb_one((vaddr)); \ } while (0) #endif |