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 <linux/sizes.h> 10 11 #include <asm/nohash/64/pgtable-4k.h> 12 #include <asm/barrier.h> 13 #include <asm/asm-const.h> 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(0xc000100000000000) 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 - FIXADDR_SIZE) 58 #define FIXADDR_SIZE SZ_32M 59 60 /* 61 * Defines the address of the vmemap area, in its own region on 62 * after the vmalloc space on Book3E 63 */ 64 #define VMEMMAP_BASE VMALLOC_END 65 #define VMEMMAP_END KERN_IO_START 66 #define vmemmap ((struct page *)VMEMMAP_BASE) 67 68 69 /* 70 * Include the PTE bits definitions 71 */ 72 #include <asm/nohash/pte-book3e.h> 73 74 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1)) 75 76 /* 77 * _PAGE_CHG_MASK masks of bits that are to be preserved across 78 * pgprot changes. 79 */ 80 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL) 81 82 #define H_PAGE_4K_PFN 0 83 84 #ifndef __ASSEMBLY__ 85 /* pte_clear moved to later in this file */ 86 87 static inline pte_t pte_mkwrite(pte_t pte) 88 { 89 return __pte(pte_val(pte) | _PAGE_RW); 90 } 91 92 static inline pte_t pte_mkdirty(pte_t pte) 93 { 94 return __pte(pte_val(pte) | _PAGE_DIRTY); 95 } 96 97 static inline pte_t pte_mkyoung(pte_t pte) 98 { 99 return __pte(pte_val(pte) | _PAGE_ACCESSED); 100 } 101 102 static inline pte_t pte_wrprotect(pte_t pte) 103 { 104 return __pte(pte_val(pte) & ~_PAGE_RW); 105 } 106 107 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1) 108 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1) 109 110 static inline void pmd_set(pmd_t *pmdp, unsigned long val) 111 { 112 *pmdp = __pmd(val); 113 } 114 115 static inline void pmd_clear(pmd_t *pmdp) 116 { 117 *pmdp = __pmd(0); 118 } 119 120 static inline pte_t pmd_pte(pmd_t pmd) 121 { 122 return __pte(pmd_val(pmd)); 123 } 124 125 #define pmd_none(pmd) (!pmd_val(pmd)) 126 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ 127 || (pmd_val(pmd) & PMD_BAD_BITS)) 128 #define pmd_present(pmd) (!pmd_none(pmd)) 129 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS) 130 extern struct page *pmd_page(pmd_t pmd); 131 #define pmd_pfn(pmd) (page_to_pfn(pmd_page(pmd))) 132 133 static inline void pud_set(pud_t *pudp, unsigned long val) 134 { 135 *pudp = __pud(val); 136 } 137 138 static inline void pud_clear(pud_t *pudp) 139 { 140 *pudp = __pud(0); 141 } 142 143 #define pud_none(pud) (!pud_val(pud)) 144 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ 145 || (pud_val(pud) & PUD_BAD_BITS)) 146 #define pud_present(pud) (pud_val(pud) != 0) 147 148 static inline pmd_t *pud_pgtable(pud_t pud) 149 { 150 return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS); 151 } 152 153 extern struct page *pud_page(pud_t pud); 154 155 static inline pte_t pud_pte(pud_t pud) 156 { 157 return __pte(pud_val(pud)); 158 } 159 160 static inline pud_t pte_pud(pte_t pte) 161 { 162 return __pud(pte_val(pte)); 163 } 164 #define pud_write(pud) pte_write(pud_pte(pud)) 165 #define p4d_write(pgd) pte_write(p4d_pte(p4d)) 166 167 static inline void p4d_set(p4d_t *p4dp, unsigned long val) 168 { 169 *p4dp = __p4d(val); 170 } 171 172 /* Atomic PTE updates */ 173 static inline unsigned long pte_update(struct mm_struct *mm, 174 unsigned long addr, 175 pte_t *ptep, unsigned long clr, 176 unsigned long set, 177 int huge) 178 { 179 unsigned long old = pte_val(*ptep); 180 *ptep = __pte((old & ~clr) | set); 181 182 /* huge pages use the old page table lock */ 183 if (!huge) 184 assert_pte_locked(mm, addr); 185 186 return old; 187 } 188 189 static inline int pte_young(pte_t pte) 190 { 191 return pte_val(pte) & _PAGE_ACCESSED; 192 } 193 194 static inline int __ptep_test_and_clear_young(struct mm_struct *mm, 195 unsigned long addr, pte_t *ptep) 196 { 197 unsigned long old; 198 199 if (pte_young(*ptep)) 200 return 0; 201 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0); 202 return (old & _PAGE_ACCESSED) != 0; 203 } 204 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 205 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ 206 ({ \ 207 int __r; \ 208 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ 209 __r; \ 210 }) 211 212 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 213 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, 214 pte_t *ptep) 215 { 216 217 if ((pte_val(*ptep) & _PAGE_RW) == 0) 218 return; 219 220 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0); 221 } 222 223 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT 224 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, 225 unsigned long addr, pte_t *ptep) 226 { 227 if ((pte_val(*ptep) & _PAGE_RW) == 0) 228 return; 229 230 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1); 231 } 232 233 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 234 #define ptep_clear_flush_young(__vma, __address, __ptep) \ 235 ({ \ 236 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \ 237 __ptep); \ 238 __young; \ 239 }) 240 241 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 242 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, 243 unsigned long addr, pte_t *ptep) 244 { 245 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0); 246 return __pte(old); 247 } 248 249 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, 250 pte_t * ptep) 251 { 252 pte_update(mm, addr, ptep, ~0UL, 0, 0); 253 } 254 255 256 /* Set the dirty and/or accessed bits atomically in a linux PTE */ 257 static inline void __ptep_set_access_flags(struct vm_area_struct *vma, 258 pte_t *ptep, pte_t entry, 259 unsigned long address, 260 int psize) 261 { 262 unsigned long bits = pte_val(entry) & 263 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC); 264 265 unsigned long old = pte_val(*ptep); 266 *ptep = __pte(old | bits); 267 268 flush_tlb_page(vma, address); 269 } 270 271 #define pte_ERROR(e) \ 272 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 273 #define pmd_ERROR(e) \ 274 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 275 #define pgd_ERROR(e) \ 276 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 277 278 /* Encode and de-code a swap entry */ 279 #define MAX_SWAPFILES_CHECK() do { \ 280 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ 281 } while (0) 282 283 #define SWP_TYPE_BITS 5 284 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ 285 & ((1UL << SWP_TYPE_BITS) - 1)) 286 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) 287 #define __swp_entry(type, offset) ((swp_entry_t) { \ 288 ((type) << _PAGE_BIT_SWAP_TYPE) \ 289 | ((offset) << PTE_RPN_SHIFT) }) 290 291 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) 292 #define __swp_entry_to_pte(x) __pte((x).val) 293 294 int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot); 295 void unmap_kernel_page(unsigned long va); 296 extern int __meminit vmemmap_create_mapping(unsigned long start, 297 unsigned long page_size, 298 unsigned long phys); 299 extern void vmemmap_remove_mapping(unsigned long start, 300 unsigned long page_size); 301 void __patch_exception(int exc, unsigned long addr); 302 #define patch_exception(exc, name) do { \ 303 extern unsigned int name; \ 304 __patch_exception((exc), (unsigned long)&name); \ 305 } while (0) 306 307 #endif /* __ASSEMBLY__ */ 308 309 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */ 310