1 #ifndef _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ 2 #define _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ 3 /* 4 * This file contains the functions and defines necessary to modify and use 5 * the ppc64 hashed page table. 6 */ 7 8 #include <asm/book3s/64/hash.h> 9 #include <asm/barrier.h> 10 11 /* 12 * The second half of the kernel virtual space is used for IO mappings, 13 * it's itself carved into the PIO region (ISA and PHB IO space) and 14 * the ioremap space 15 * 16 * ISA_IO_BASE = KERN_IO_START, 64K reserved area 17 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces 18 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE 19 */ 20 #define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1)) 21 #define FULL_IO_SIZE 0x80000000ul 22 #define ISA_IO_BASE (KERN_IO_START) 23 #define ISA_IO_END (KERN_IO_START + 0x10000ul) 24 #define PHB_IO_BASE (ISA_IO_END) 25 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE) 26 #define IOREMAP_BASE (PHB_IO_END) 27 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE) 28 29 #define vmemmap ((struct page *)VMEMMAP_BASE) 30 31 /* Advertise special mapping type for AGP */ 32 #define HAVE_PAGE_AGP 33 34 /* Advertise support for _PAGE_SPECIAL */ 35 #define __HAVE_ARCH_PTE_SPECIAL 36 37 #ifndef __ASSEMBLY__ 38 39 /* 40 * This is the default implementation of various PTE accessors, it's 41 * used in all cases except Book3S with 64K pages where we have a 42 * concept of sub-pages 43 */ 44 #ifndef __real_pte 45 46 #ifdef CONFIG_STRICT_MM_TYPECHECKS 47 #define __real_pte(e,p) ((real_pte_t){(e)}) 48 #define __rpte_to_pte(r) ((r).pte) 49 #else 50 #define __real_pte(e,p) (e) 51 #define __rpte_to_pte(r) (__pte(r)) 52 #endif 53 #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >>_PAGE_F_GIX_SHIFT) 54 55 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \ 56 do { \ 57 index = 0; \ 58 shift = mmu_psize_defs[psize].shift; \ 59 60 #define pte_iterate_hashed_end() } while(0) 61 62 /* 63 * We expect this to be called only for user addresses or kernel virtual 64 * addresses other than the linear mapping. 65 */ 66 #define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K 67 68 #endif /* __real_pte */ 69 70 static inline void pmd_set(pmd_t *pmdp, unsigned long val) 71 { 72 *pmdp = __pmd(val); 73 } 74 75 static inline void pmd_clear(pmd_t *pmdp) 76 { 77 *pmdp = __pmd(0); 78 } 79 80 #define pmd_none(pmd) (!pmd_val(pmd)) 81 #define pmd_present(pmd) (!pmd_none(pmd)) 82 83 static inline void pud_set(pud_t *pudp, unsigned long val) 84 { 85 *pudp = __pud(val); 86 } 87 88 static inline void pud_clear(pud_t *pudp) 89 { 90 *pudp = __pud(0); 91 } 92 93 #define pud_none(pud) (!pud_val(pud)) 94 #define pud_present(pud) (pud_val(pud) != 0) 95 96 extern struct page *pud_page(pud_t pud); 97 extern struct page *pmd_page(pmd_t pmd); 98 static inline pte_t pud_pte(pud_t pud) 99 { 100 return __pte(pud_val(pud)); 101 } 102 103 static inline pud_t pte_pud(pte_t pte) 104 { 105 return __pud(pte_val(pte)); 106 } 107 #define pud_write(pud) pte_write(pud_pte(pud)) 108 #define pgd_write(pgd) pte_write(pgd_pte(pgd)) 109 static inline void pgd_set(pgd_t *pgdp, unsigned long val) 110 { 111 *pgdp = __pgd(val); 112 } 113 114 /* 115 * Find an entry in a page-table-directory. We combine the address region 116 * (the high order N bits) and the pgd portion of the address. 117 */ 118 119 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 120 121 #define pmd_offset(pudp,addr) \ 122 (((pmd_t *) pud_page_vaddr(*(pudp))) + pmd_index(addr)) 123 124 #define pte_offset_kernel(dir,addr) \ 125 (((pte_t *) pmd_page_vaddr(*(dir))) + pte_index(addr)) 126 127 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) 128 #define pte_unmap(pte) do { } while(0) 129 130 /* to find an entry in a kernel page-table-directory */ 131 /* This now only contains the vmalloc pages */ 132 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 133 134 #define pte_ERROR(e) \ 135 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 136 #define pmd_ERROR(e) \ 137 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) 138 #define pgd_ERROR(e) \ 139 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) 140 141 /* Encode and de-code a swap entry */ 142 #define MAX_SWAPFILES_CHECK() do { \ 143 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ 144 /* \ 145 * Don't have overlapping bits with _PAGE_HPTEFLAGS \ 146 * We filter HPTEFLAGS on set_pte. \ 147 */ \ 148 BUILD_BUG_ON(_PAGE_HPTEFLAGS & (0x1f << _PAGE_BIT_SWAP_TYPE)); \ 149 BUILD_BUG_ON(_PAGE_HPTEFLAGS & _PAGE_SWP_SOFT_DIRTY); \ 150 } while (0) 151 /* 152 * on pte we don't need handle RADIX_TREE_EXCEPTIONAL_SHIFT; 153 */ 154 #define SWP_TYPE_BITS 5 155 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ 156 & ((1UL << SWP_TYPE_BITS) - 1)) 157 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) 158 #define __swp_entry(type, offset) ((swp_entry_t) { \ 159 ((type) << _PAGE_BIT_SWAP_TYPE) \ 160 | ((offset) << PTE_RPN_SHIFT) }) 161 /* 162 * swp_entry_t must be independent of pte bits. We build a swp_entry_t from 163 * swap type and offset we get from swap and convert that to pte to find a 164 * matching pte in linux page table. 165 * Clear bits not found in swap entries here. 166 */ 167 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) & ~_PAGE_PTE }) 168 #define __swp_entry_to_pte(x) __pte((x).val | _PAGE_PTE) 169 170 #ifdef CONFIG_MEM_SOFT_DIRTY 171 #define _PAGE_SWP_SOFT_DIRTY (1UL << (SWP_TYPE_BITS + _PAGE_BIT_SWAP_TYPE)) 172 #else 173 #define _PAGE_SWP_SOFT_DIRTY 0UL 174 #endif /* CONFIG_MEM_SOFT_DIRTY */ 175 176 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 177 static inline pte_t pte_swp_mksoft_dirty(pte_t pte) 178 { 179 return __pte(pte_val(pte) | _PAGE_SWP_SOFT_DIRTY); 180 } 181 static inline bool pte_swp_soft_dirty(pte_t pte) 182 { 183 return !!(pte_val(pte) & _PAGE_SWP_SOFT_DIRTY); 184 } 185 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) 186 { 187 return __pte(pte_val(pte) & ~_PAGE_SWP_SOFT_DIRTY); 188 } 189 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 190 191 void pgtable_cache_add(unsigned shift, void (*ctor)(void *)); 192 void pgtable_cache_init(void); 193 194 struct page *realmode_pfn_to_page(unsigned long pfn); 195 196 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 197 extern pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot); 198 extern pmd_t mk_pmd(struct page *page, pgprot_t pgprot); 199 extern pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot); 200 extern void set_pmd_at(struct mm_struct *mm, unsigned long addr, 201 pmd_t *pmdp, pmd_t pmd); 202 extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr, 203 pmd_t *pmd); 204 extern int has_transparent_hugepage(void); 205 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ 206 207 208 static inline pte_t pmd_pte(pmd_t pmd) 209 { 210 return __pte(pmd_val(pmd)); 211 } 212 213 static inline pmd_t pte_pmd(pte_t pte) 214 { 215 return __pmd(pte_val(pte)); 216 } 217 218 static inline pte_t *pmdp_ptep(pmd_t *pmd) 219 { 220 return (pte_t *)pmd; 221 } 222 223 #define pmd_pfn(pmd) pte_pfn(pmd_pte(pmd)) 224 #define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd)) 225 #define pmd_young(pmd) pte_young(pmd_pte(pmd)) 226 #define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd))) 227 #define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd))) 228 #define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd))) 229 #define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd))) 230 #define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd))) 231 #define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd))) 232 233 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY 234 #define pmd_soft_dirty(pmd) pte_soft_dirty(pmd_pte(pmd)) 235 #define pmd_mksoft_dirty(pmd) pte_pmd(pte_mksoft_dirty(pmd_pte(pmd))) 236 #define pmd_clear_soft_dirty(pmd) pte_pmd(pte_clear_soft_dirty(pmd_pte(pmd))) 237 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ 238 239 #ifdef CONFIG_NUMA_BALANCING 240 static inline int pmd_protnone(pmd_t pmd) 241 { 242 return pte_protnone(pmd_pte(pmd)); 243 } 244 #endif /* CONFIG_NUMA_BALANCING */ 245 246 #define __HAVE_ARCH_PMD_WRITE 247 #define pmd_write(pmd) pte_write(pmd_pte(pmd)) 248 249 static inline pmd_t pmd_mkhuge(pmd_t pmd) 250 { 251 return __pmd(pmd_val(pmd) | (_PAGE_PTE | _PAGE_THP_HUGE)); 252 } 253 254 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS 255 extern int pmdp_set_access_flags(struct vm_area_struct *vma, 256 unsigned long address, pmd_t *pmdp, 257 pmd_t entry, int dirty); 258 259 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG 260 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma, 261 unsigned long address, pmd_t *pmdp); 262 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH 263 extern int pmdp_clear_flush_young(struct vm_area_struct *vma, 264 unsigned long address, pmd_t *pmdp); 265 266 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR 267 extern pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, 268 unsigned long addr, pmd_t *pmdp); 269 270 extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, 271 unsigned long address, pmd_t *pmdp); 272 #define pmdp_collapse_flush pmdp_collapse_flush 273 274 #define __HAVE_ARCH_PGTABLE_DEPOSIT 275 extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, 276 pgtable_t pgtable); 277 #define __HAVE_ARCH_PGTABLE_WITHDRAW 278 extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); 279 280 #define __HAVE_ARCH_PMDP_INVALIDATE 281 extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address, 282 pmd_t *pmdp); 283 284 #define pmd_move_must_withdraw pmd_move_must_withdraw 285 struct spinlock; 286 static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl, 287 struct spinlock *old_pmd_ptl) 288 { 289 /* 290 * Archs like ppc64 use pgtable to store per pmd 291 * specific information. So when we switch the pmd, 292 * we should also withdraw and deposit the pgtable 293 */ 294 return true; 295 } 296 #endif /* __ASSEMBLY__ */ 297 #endif /* _ASM_POWERPC_BOOK3S_64_PGTABLE_H_ */ 298