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_START (ioremap_bot) 57 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE) 58 59 60 /* 61 * Region IDs 62 */ 63 #define REGION_SHIFT 60UL 64 #define REGION_MASK (0xfUL << REGION_SHIFT) 65 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT) 66 67 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START)) 68 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET)) 69 #define USER_REGION_ID (0UL) 70 71 /* 72 * Defines the address of the vmemap area, in its own region on 73 * after the vmalloc space on Book3E 74 */ 75 #define VMEMMAP_BASE VMALLOC_END 76 #define VMEMMAP_END KERN_IO_START 77 #define vmemmap ((struct page *)VMEMMAP_BASE) 78 79 80 /* 81 * Include the PTE bits definitions 82 */ 83 #include <asm/nohash/pte-book3e.h> 84 85 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1)) 86 87 /* 88 * _PAGE_CHG_MASK masks of bits that are to be preserved across 89 * pgprot changes. 90 */ 91 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) 92 93 #define H_PAGE_4K_PFN 0 94 95 #ifndef __ASSEMBLY__ 96 /* pte_clear moved to later in this file */ 97 98 static inline pte_t pte_mkwrite(pte_t pte) 99 { 100 return __pte(pte_val(pte) | _PAGE_RW); 101 } 102 103 static inline pte_t pte_mkdirty(pte_t pte) 104 { 105 return __pte(pte_val(pte) | _PAGE_DIRTY); 106 } 107 108 static inline pte_t pte_mkyoung(pte_t pte) 109 { 110 return __pte(pte_val(pte) | _PAGE_ACCESSED); 111 } 112 113 static inline pte_t pte_wrprotect(pte_t pte) 114 { 115 return __pte(pte_val(pte) & ~_PAGE_RW); 116 } 117 118 static inline pte_t pte_mkexec(pte_t pte) 119 { 120 return __pte(pte_val(pte) | _PAGE_EXEC); 121 } 122 123 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1) 124 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1) 125 126 static inline void pmd_set(pmd_t *pmdp, unsigned long val) 127 { 128 *pmdp = __pmd(val); 129 } 130 131 static inline void pmd_clear(pmd_t *pmdp) 132 { 133 *pmdp = __pmd(0); 134 } 135 136 static inline pte_t pmd_pte(pmd_t pmd) 137 { 138 return __pte(pmd_val(pmd)); 139 } 140 141 #define pmd_none(pmd) (!pmd_val(pmd)) 142 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ 143 || (pmd_val(pmd) & PMD_BAD_BITS)) 144 #define pmd_present(pmd) (!pmd_none(pmd)) 145 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS) 146 extern struct page *pmd_page(pmd_t pmd); 147 148 static inline void pud_set(pud_t *pudp, unsigned long val) 149 { 150 *pudp = __pud(val); 151 } 152 153 static inline void pud_clear(pud_t *pudp) 154 { 155 *pudp = __pud(0); 156 } 157 158 #define pud_none(pud) (!pud_val(pud)) 159 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ 160 || (pud_val(pud) & PUD_BAD_BITS)) 161 #define pud_present(pud) (pud_val(pud) != 0) 162 #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS) 163 164 extern struct page *pud_page(pud_t pud); 165 166 static inline pte_t pud_pte(pud_t pud) 167 { 168 return __pte(pud_val(pud)); 169 } 170 171 static inline pud_t pte_pud(pte_t pte) 172 { 173 return __pud(pte_val(pte)); 174 } 175 #define pud_write(pud) pte_write(pud_pte(pud)) 176 #define p4d_write(pgd) pte_write(p4d_pte(p4d)) 177 178 static inline void p4d_set(p4d_t *p4dp, unsigned long val) 179 { 180 *p4dp = __p4d(val); 181 } 182 183 /* Atomic PTE updates */ 184 static inline unsigned long pte_update(struct mm_struct *mm, 185 unsigned long addr, 186 pte_t *ptep, unsigned long clr, 187 unsigned long set, 188 int huge) 189 { 190 unsigned long old = pte_val(*ptep); 191 *ptep = __pte((old & ~clr) | set); 192 193 /* huge pages use the old page table lock */ 194 if (!huge) 195 assert_pte_locked(mm, addr); 196 197 return old; 198 } 199 200 static inline int pte_young(pte_t pte) 201 { 202 return pte_val(pte) & _PAGE_ACCESSED; 203 } 204 205 static inline int __ptep_test_and_clear_young(struct mm_struct *mm, 206 unsigned long addr, pte_t *ptep) 207 { 208 unsigned long old; 209 210 if (pte_young(*ptep)) 211 return 0; 212 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0); 213 return (old & _PAGE_ACCESSED) != 0; 214 } 215 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 216 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ 217 ({ \ 218 int __r; \ 219 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ 220 __r; \ 221 }) 222 223 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 224 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, 225 pte_t *ptep) 226 { 227 228 if ((pte_val(*ptep) & _PAGE_RW) == 0) 229 return; 230 231 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0); 232 } 233 234 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT 235 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 236 unsigned long addr, pte_t *ptep) 237 { 238 if ((pte_val(*ptep) & _PAGE_RW) == 0) 239 return; 240 241 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1); 242 } 243 244 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 245 #define ptep_clear_flush_young(__vma, __address, __ptep) \ 246 ({ \ 247 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \ 248 __ptep); \ 249 __young; \ 250 }) 251 252 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 253 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 254 unsigned long addr, pte_t *ptep) 255 { 256 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); 257 return __pte(old); 258 } 259 260 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 261 pte_t * ptep) 262 { 263 pte_update(mm, addr, ptep, ~0UL, 0, 0); 264 } 265 266 267 /* Set the dirty and/or accessed bits atomically in a linux PTE */ 268 static inline void __ptep_set_access_flags(struct vm_area_struct *vma, 269 pte_t *ptep, pte_t entry, 270 unsigned long address, 271 int psize) 272 { 273 unsigned long bits = pte_val(entry) & 274 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); 275 276 unsigned long old = pte_val(*ptep); 277 *ptep = __pte(old | bits); 278 279 flush_tlb_page(vma, address); 280 } 281 282 #define __HAVE_ARCH_PTE_SAME 283 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0) 284 285 #define pte_ERROR(e) \ 286 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 287 #define pmd_ERROR(e) \ 288 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 289 #define pgd_ERROR(e) \ 290 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 291 292 /* Encode and de-code a swap entry */ 293 #define MAX_SWAPFILES_CHECK() do { \ 294 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ 295 } while (0) 296 297 #define SWP_TYPE_BITS 5 298 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ 299 & ((1UL << SWP_TYPE_BITS) - 1)) 300 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) 301 #define __swp_entry(type, offset) ((swp_entry_t) { \ 302 ((type) << _PAGE_BIT_SWAP_TYPE) \ 303 | ((offset) << PTE_RPN_SHIFT) }) 304 305 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) 306 #define __swp_entry_to_pte(x) __pte((x).val) 307 308 int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot); 309 extern int __meminit vmemmap_create_mapping(unsigned long start, 310 unsigned long page_size, 311 unsigned long phys); 312 extern void vmemmap_remove_mapping(unsigned long start, 313 unsigned long page_size); 314 #endif /* __ASSEMBLY__ */ 315 316 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */ 317