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