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