1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H 3 #define _ASM_POWERPC_NOHASH_64_PGTABLE_H 4 /* 5 * This file contains the functions and defines necessary to modify and use 6 * the ppc64 non-hashed page table. 7 */ 8 9 #include <asm/nohash/64/pgtable-4k.h> 10 #include <asm/barrier.h> 11 #include <asm/asm-const.h> 12 13 #ifdef CONFIG_PPC_64K_PAGES 14 #error "Page size not supported" 15 #endif 16 17 #define FIRST_USER_ADDRESS 0UL 18 19 /* 20 * Size of EA range mapped by our pagetables. 21 */ 22 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \ 23 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT) 24 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE) 25 26 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 27 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1) 28 #else 29 #define PMD_CACHE_INDEX PMD_INDEX_SIZE 30 #endif 31 #define PUD_CACHE_INDEX PUD_INDEX_SIZE 32 33 /* 34 * Define the address range of the kernel non-linear virtual area 35 */ 36 #define KERN_VIRT_START ASM_CONST(0x8000000000000000) 37 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000) 38 39 /* 40 * The vmalloc space starts at the beginning of that region, and 41 * occupies a quarter of it on Book3E 42 * (we keep a quarter for the virtual memmap) 43 */ 44 #define VMALLOC_START KERN_VIRT_START 45 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2) 46 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) 47 48 /* 49 * The second half of the kernel virtual space is used for IO mappings, 50 * it's itself carved into the PIO region (ISA and PHB IO space) and 51 * the ioremap space 52 * 53 * ISA_IO_BASE = KERN_IO_START, 64K reserved area 54 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces 55 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE 56 */ 57 #define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1)) 58 #define FULL_IO_SIZE 0x80000000ul 59 #define ISA_IO_BASE (KERN_IO_START) 60 #define ISA_IO_END (KERN_IO_START + 0x10000ul) 61 #define PHB_IO_BASE (ISA_IO_END) 62 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) 63 #define IOREMAP_BASE (PHB_IO_END) 64 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE) 65 66 67 /* 68 * Region IDs 69 */ 70 #define REGION_SHIFT 60UL 71 #define REGION_MASK (0xfUL << REGION_SHIFT) 72 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT) 73 74 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START)) 75 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET)) 76 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */ 77 #define USER_REGION_ID (0UL) 78 79 /* 80 * Defines the address of the vmemap area, in its own region on 81 * after the vmalloc space on Book3E 82 */ 83 #define VMEMMAP_BASE VMALLOC_END 84 #define VMEMMAP_END KERN_IO_START 85 #define vmemmap ((struct page *)VMEMMAP_BASE) 86 87 88 /* 89 * Include the PTE bits definitions 90 */ 91 #include <asm/nohash/pte-book3e.h> 92 93 #define _PAGE_SAO 0 94 95 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1)) 96 97 /* 98 * _PAGE_CHG_MASK masks of bits that are to be preserved across 99 * pgprot changes. 100 */ 101 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) 102 103 #define H_PAGE_4K_PFN 0 104 105 #ifndef __ASSEMBLY__ 106 /* pte_clear moved to later in this file */ 107 108 static inline pte_t pte_mkwrite(pte_t pte) 109 { 110 return __pte(pte_val(pte) | _PAGE_RW); 111 } 112 113 static inline pte_t pte_mkdirty(pte_t pte) 114 { 115 return __pte(pte_val(pte) | _PAGE_DIRTY); 116 } 117 118 static inline pte_t pte_mkyoung(pte_t pte) 119 { 120 return __pte(pte_val(pte) | _PAGE_ACCESSED); 121 } 122 123 static inline pte_t pte_wrprotect(pte_t pte) 124 { 125 return __pte(pte_val(pte) & ~_PAGE_RW); 126 } 127 128 static inline pte_t pte_mkexec(pte_t pte) 129 { 130 return __pte(pte_val(pte) | _PAGE_EXEC); 131 } 132 133 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1) 134 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1) 135 136 static inline void pmd_set(pmd_t *pmdp, unsigned long val) 137 { 138 *pmdp = __pmd(val); 139 } 140 141 static inline void pmd_clear(pmd_t *pmdp) 142 { 143 *pmdp = __pmd(0); 144 } 145 146 static inline pte_t pmd_pte(pmd_t pmd) 147 { 148 return __pte(pmd_val(pmd)); 149 } 150 151 #define pmd_none(pmd) (!pmd_val(pmd)) 152 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ 153 || (pmd_val(pmd) & PMD_BAD_BITS)) 154 #define pmd_present(pmd) (!pmd_none(pmd)) 155 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS) 156 extern struct page *pmd_page(pmd_t pmd); 157 158 static inline void pud_set(pud_t *pudp, unsigned long val) 159 { 160 *pudp = __pud(val); 161 } 162 163 static inline void pud_clear(pud_t *pudp) 164 { 165 *pudp = __pud(0); 166 } 167 168 #define pud_none(pud) (!pud_val(pud)) 169 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ 170 || (pud_val(pud) & PUD_BAD_BITS)) 171 #define pud_present(pud) (pud_val(pud) != 0) 172 #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS) 173 174 extern struct page *pud_page(pud_t pud); 175 176 static inline pte_t pud_pte(pud_t pud) 177 { 178 return __pte(pud_val(pud)); 179 } 180 181 static inline pud_t pte_pud(pte_t pte) 182 { 183 return __pud(pte_val(pte)); 184 } 185 #define pud_write(pud) pte_write(pud_pte(pud)) 186 #define pgd_write(pgd) pte_write(pgd_pte(pgd)) 187 188 static inline void pgd_set(pgd_t *pgdp, unsigned long val) 189 { 190 *pgdp = __pgd(val); 191 } 192 193 /* 194 * Find an entry in a page-table-directory. We combine the address region 195 * (the high order N bits) and the pgd portion of the address. 196 */ 197 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1)) 198 199 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 200 201 #define pmd_offset(pudp,addr) \ 202 (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))) 203 204 #define pte_offset_kernel(dir,addr) \ 205 (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) 206 207 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 208 #define pte_unmap(pte) do { } while(0) 209 210 /* to find an entry in a kernel page-table-directory */ 211 /* This now only contains the vmalloc pages */ 212 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 213 214 /* Atomic PTE updates */ 215 static inline unsigned long pte_update(struct mm_struct *mm, 216 unsigned long addr, 217 pte_t *ptep, unsigned long clr, 218 unsigned long set, 219 int huge) 220 { 221 #ifdef PTE_ATOMIC_UPDATES 222 unsigned long old, tmp; 223 224 __asm__ __volatile__( 225 "1: ldarx %0,0,%3 # pte_update\n\ 226 andc %1,%0,%4 \n\ 227 or %1,%1,%6\n\ 228 stdcx. %1,0,%3 \n\ 229 bne- 1b" 230 : "=&r" (old), "=&r" (tmp), "=m" (*ptep) 231 : "r" (ptep), "r" (clr), "m" (*ptep), "r" (set) 232 : "cc" ); 233 #else 234 unsigned long old = pte_val(*ptep); 235 *ptep = __pte((old & ~clr) | set); 236 #endif 237 /* huge pages use the old page table lock */ 238 if (!huge) 239 assert_pte_locked(mm, addr); 240 241 return old; 242 } 243 244 static inline int pte_young(pte_t pte) 245 { 246 return pte_val(pte) & _PAGE_ACCESSED; 247 } 248 249 static inline int __ptep_test_and_clear_young(struct mm_struct *mm, 250 unsigned long addr, pte_t *ptep) 251 { 252 unsigned long old; 253 254 if (pte_young(*ptep)) 255 return 0; 256 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0); 257 return (old & _PAGE_ACCESSED) != 0; 258 } 259 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 260 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ 261 ({ \ 262 int __r; \ 263 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ 264 __r; \ 265 }) 266 267 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 268 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, 269 pte_t *ptep) 270 { 271 272 if ((pte_val(*ptep) & _PAGE_RW) == 0) 273 return; 274 275 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0); 276 } 277 278 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT 279 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 280 unsigned long addr, pte_t *ptep) 281 { 282 if ((pte_val(*ptep) & _PAGE_RW) == 0) 283 return; 284 285 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1); 286 } 287 288 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 289 #define ptep_clear_flush_young(__vma, __address, __ptep) \ 290 ({ \ 291 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \ 292 __ptep); \ 293 __young; \ 294 }) 295 296 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 297 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 298 unsigned long addr, pte_t *ptep) 299 { 300 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); 301 return __pte(old); 302 } 303 304 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 305 pte_t * ptep) 306 { 307 pte_update(mm, addr, ptep, ~0UL, 0, 0); 308 } 309 310 311 /* Set the dirty and/or accessed bits atomically in a linux PTE */ 312 static inline void __ptep_set_access_flags(struct vm_area_struct *vma, 313 pte_t *ptep, pte_t entry, 314 unsigned long address, 315 int psize) 316 { 317 unsigned long bits = pte_val(entry) & 318 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); 319 320 #ifdef PTE_ATOMIC_UPDATES 321 unsigned long old, tmp; 322 323 __asm__ __volatile__( 324 "1: ldarx %0,0,%4\n\ 325 or %0,%3,%0\n\ 326 stdcx. %0,0,%4\n\ 327 bne- 1b" 328 :"=&r" (old), "=&r" (tmp), "=m" (*ptep) 329 :"r" (bits), "r" (ptep), "m" (*ptep) 330 :"cc"); 331 #else 332 unsigned long old = pte_val(*ptep); 333 *ptep = __pte(old | bits); 334 #endif 335 336 flush_tlb_page(vma, address); 337 } 338 339 #define __HAVE_ARCH_PTE_SAME 340 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0) 341 342 #define pte_ERROR(e) \ 343 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 344 #define pmd_ERROR(e) \ 345 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 346 #define pgd_ERROR(e) \ 347 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 348 349 /* Encode and de-code a swap entry */ 350 #define MAX_SWAPFILES_CHECK() do { \ 351 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ 352 } while (0) 353 354 #define SWP_TYPE_BITS 5 355 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ 356 & ((1UL << SWP_TYPE_BITS) - 1)) 357 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) 358 #define __swp_entry(type, offset) ((swp_entry_t) { \ 359 ((type) << _PAGE_BIT_SWAP_TYPE) \ 360 | ((offset) << PTE_RPN_SHIFT) }) 361 362 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) 363 #define __swp_entry_to_pte(x) __pte((x).val) 364 365 int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot); 366 extern int __meminit vmemmap_create_mapping(unsigned long start, 367 unsigned long page_size, 368 unsigned long phys); 369 extern void vmemmap_remove_mapping(unsigned long start, 370 unsigned long page_size); 371 #endif /* __ASSEMBLY__ */ 372 373 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */ 374