David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_PGTABLE_PPC64_H_ |
| 2 | #define _ASM_POWERPC_PGTABLE_PPC64_H_ |
| 3 | /* |
| 4 | * This file contains the functions and defines necessary to modify and use |
| 5 | * the ppc64 hashed page table. |
| 6 | */ |
| 7 | |
| 8 | #ifndef __ASSEMBLY__ |
| 9 | #include <linux/stddef.h> |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 10 | #include <asm/tlbflush.h> |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 11 | #endif /* __ASSEMBLY__ */ |
| 12 | |
| 13 | #ifdef CONFIG_PPC_64K_PAGES |
Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 14 | #include <asm/pgtable-ppc64-64k.h> |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 15 | #else |
Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 16 | #include <asm/pgtable-ppc64-4k.h> |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 17 | #endif |
| 18 | |
| 19 | #define FIRST_USER_ADDRESS 0 |
| 20 | |
| 21 | /* |
| 22 | * Size of EA range mapped by our pagetables. |
| 23 | */ |
| 24 | #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \ |
| 25 | PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT) |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 26 | #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE) |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 27 | |
Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 28 | |
| 29 | /* Some sanity checking */ |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 30 | #if TASK_SIZE_USER64 > PGTABLE_RANGE |
| 31 | #error TASK_SIZE_USER64 exceeds pagetable range |
| 32 | #endif |
| 33 | |
| 34 | #if TASK_SIZE_USER64 > (1UL << (USER_ESID_BITS + SID_SHIFT)) |
| 35 | #error TASK_SIZE_USER64 exceeds user VSID range |
| 36 | #endif |
| 37 | |
| 38 | /* |
| 39 | * Define the address range of the vmalloc VM area. |
| 40 | */ |
| 41 | #define VMALLOC_START ASM_CONST(0xD000000000000000) |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 42 | #define VMALLOC_SIZE (PGTABLE_RANGE >> 1) |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 43 | #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE) |
| 44 | |
| 45 | /* |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 46 | * Define the address ranges for MMIO and IO space : |
| 47 | * |
| 48 | * ISA_IO_BASE = VMALLOC_END, 64K reserved area |
| 49 | * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces |
| 50 | * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 51 | */ |
Benjamin Herrenschmidt | 3d5134e | 2007-06-04 15:15:36 +1000 | [diff] [blame] | 52 | #define FULL_IO_SIZE 0x80000000ul |
| 53 | #define ISA_IO_BASE (VMALLOC_END) |
| 54 | #define ISA_IO_END (VMALLOC_END + 0x10000ul) |
| 55 | #define PHB_IO_BASE (ISA_IO_END) |
| 56 | #define PHB_IO_END (VMALLOC_END + FULL_IO_SIZE) |
| 57 | #define IOREMAP_BASE (PHB_IO_END) |
| 58 | #define IOREMAP_END (VMALLOC_START + PGTABLE_RANGE) |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 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)) |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 69 | #define VMEMMAP_REGION_ID (0xfUL) |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 70 | #define USER_REGION_ID (0UL) |
| 71 | |
| 72 | /* |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 73 | * Defines the address of the vmemap area, in its own region |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 74 | */ |
Benjamin Herrenschmidt | cec08e7 | 2008-04-30 15:41:48 +1000 | [diff] [blame] | 75 | #define VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT) |
| 76 | #define vmemmap ((struct page *)VMEMMAP_BASE) |
| 77 | |
Andy Whitcroft | d29eff7 | 2007-10-16 01:24:17 -0700 | [diff] [blame] | 78 | |
| 79 | /* |
Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 80 | * Include the PTE bits definitions |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 81 | */ |
Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 82 | #include <asm/pte-hash64.h> |
Benjamin Herrenschmidt | 7108700 | 2009-03-19 19:34:09 +0000 | [diff] [blame] | 83 | #include <asm/pte-common.h> |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 84 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 85 | |
Benjamin Herrenschmidt | 94ee815 | 2008-09-03 13:12:05 +1000 | [diff] [blame] | 86 | #ifdef CONFIG_PPC_MM_SLICES |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 87 | #define HAVE_ARCH_UNMAPPED_AREA |
| 88 | #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN |
Benjamin Herrenschmidt | 94ee815 | 2008-09-03 13:12:05 +1000 | [diff] [blame] | 89 | #endif /* CONFIG_PPC_MM_SLICES */ |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 90 | |
| 91 | #ifndef __ASSEMBLY__ |
| 92 | |
| 93 | /* |
Benjamin Herrenschmidt | c605782 | 2009-03-10 17:53:29 +0000 | [diff] [blame] | 94 | * This is the default implementation of various PTE accessors, it's |
| 95 | * used in all cases except Book3S with 64K pages where we have a |
| 96 | * concept of sub-pages |
| 97 | */ |
| 98 | #ifndef __real_pte |
| 99 | |
| 100 | #ifdef STRICT_MM_TYPECHECKS |
| 101 | #define __real_pte(e,p) ((real_pte_t){(e)}) |
| 102 | #define __rpte_to_pte(r) ((r).pte) |
| 103 | #else |
| 104 | #define __real_pte(e,p) (e) |
| 105 | #define __rpte_to_pte(r) (__pte(r)) |
| 106 | #endif |
| 107 | #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> 12) |
| 108 | |
| 109 | #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \ |
| 110 | do { \ |
| 111 | index = 0; \ |
| 112 | shift = mmu_psize_defs[psize].shift; \ |
| 113 | |
| 114 | #define pte_iterate_hashed_end() } while(0) |
| 115 | |
| 116 | #ifdef CONFIG_PPC_HAS_HASH_64K |
| 117 | #define pte_pagesize_index(mm, addr, pte) get_slice_psize(mm, addr) |
| 118 | #else |
| 119 | #define pte_pagesize_index(mm, addr, pte) MMU_PAGE_4K |
| 120 | #endif |
| 121 | |
| 122 | #endif /* __real_pte */ |
| 123 | |
| 124 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 125 | /* pte_clear moved to later in this file */ |
| 126 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 127 | #define PMD_BAD_BITS (PTE_TABLE_SIZE-1) |
| 128 | #define PUD_BAD_BITS (PMD_TABLE_SIZE-1) |
| 129 | |
| 130 | #define pmd_set(pmdp, pmdval) (pmd_val(*(pmdp)) = (pmdval)) |
| 131 | #define pmd_none(pmd) (!pmd_val(pmd)) |
| 132 | #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \ |
| 133 | || (pmd_val(pmd) & PMD_BAD_BITS)) |
| 134 | #define pmd_present(pmd) (pmd_val(pmd) != 0) |
| 135 | #define pmd_clear(pmdp) (pmd_val(*(pmdp)) = 0) |
| 136 | #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS) |
| 137 | #define pmd_page(pmd) virt_to_page(pmd_page_vaddr(pmd)) |
| 138 | |
| 139 | #define pud_set(pudp, pudval) (pud_val(*(pudp)) = (pudval)) |
| 140 | #define pud_none(pud) (!pud_val(pud)) |
| 141 | #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \ |
| 142 | || (pud_val(pud) & PUD_BAD_BITS)) |
| 143 | #define pud_present(pud) (pud_val(pud) != 0) |
| 144 | #define pud_clear(pudp) (pud_val(*(pudp)) = 0) |
| 145 | #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS) |
| 146 | #define pud_page(pud) virt_to_page(pud_page_vaddr(pud)) |
| 147 | |
| 148 | #define pgd_set(pgdp, pudp) ({pgd_val(*(pgdp)) = (unsigned long)(pudp);}) |
| 149 | |
| 150 | /* |
| 151 | * Find an entry in a page-table-directory. We combine the address region |
| 152 | * (the high order N bits) and the pgd portion of the address. |
| 153 | */ |
| 154 | /* to avoid overflow in free_pgtables we don't use PTRS_PER_PGD here */ |
| 155 | #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & 0x1ff) |
| 156 | |
| 157 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) |
| 158 | |
| 159 | #define pmd_offset(pudp,addr) \ |
| 160 | (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))) |
| 161 | |
| 162 | #define pte_offset_kernel(dir,addr) \ |
| 163 | (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))) |
| 164 | |
| 165 | #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr)) |
| 166 | #define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr)) |
| 167 | #define pte_unmap(pte) do { } while(0) |
| 168 | #define pte_unmap_nested(pte) do { } while(0) |
| 169 | |
| 170 | /* to find an entry in a kernel page-table-directory */ |
| 171 | /* This now only contains the vmalloc pages */ |
| 172 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) |
| 173 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 174 | |
| 175 | /* Atomic PTE updates */ |
| 176 | static inline unsigned long pte_update(struct mm_struct *mm, |
| 177 | unsigned long addr, |
| 178 | pte_t *ptep, unsigned long clr, |
| 179 | int huge) |
| 180 | { |
Benjamin Herrenschmidt | a033a48 | 2009-03-19 19:34:15 +0000 | [diff] [blame^] | 181 | #ifdef PTE_ATOMIC_UPDATES |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 182 | unsigned long old, tmp; |
| 183 | |
| 184 | __asm__ __volatile__( |
| 185 | "1: ldarx %0,0,%3 # pte_update\n\ |
| 186 | andi. %1,%0,%6\n\ |
| 187 | bne- 1b \n\ |
| 188 | andc %1,%0,%4 \n\ |
| 189 | stdcx. %1,0,%3 \n\ |
| 190 | bne- 1b" |
| 191 | : "=&r" (old), "=&r" (tmp), "=m" (*ptep) |
| 192 | : "r" (ptep), "r" (clr), "m" (*ptep), "i" (_PAGE_BUSY) |
| 193 | : "cc" ); |
Benjamin Herrenschmidt | a033a48 | 2009-03-19 19:34:15 +0000 | [diff] [blame^] | 194 | #else |
| 195 | unsigned long old = pte_val(*ptep); |
| 196 | *ptep = __pte(old & ~clr); |
| 197 | #endif |
Benjamin Herrenschmidt | 8d30c14 | 2009-02-10 16:02:37 +0000 | [diff] [blame] | 198 | /* huge pages use the old page table lock */ |
| 199 | if (!huge) |
| 200 | assert_pte_locked(mm, addr); |
| 201 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 202 | if (old & _PAGE_HASHPTE) |
| 203 | hpte_need_flush(mm, addr, ptep, old, huge); |
| 204 | return old; |
| 205 | } |
| 206 | |
| 207 | static inline int __ptep_test_and_clear_young(struct mm_struct *mm, |
| 208 | unsigned long addr, pte_t *ptep) |
| 209 | { |
| 210 | unsigned long old; |
| 211 | |
| 212 | if ((pte_val(*ptep) & (_PAGE_ACCESSED | _PAGE_HASHPTE)) == 0) |
| 213 | return 0; |
| 214 | old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0); |
| 215 | return (old & _PAGE_ACCESSED) != 0; |
| 216 | } |
| 217 | #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
| 218 | #define ptep_test_and_clear_young(__vma, __addr, __ptep) \ |
| 219 | ({ \ |
| 220 | int __r; \ |
| 221 | __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \ |
| 222 | __r; \ |
| 223 | }) |
| 224 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 225 | #define __HAVE_ARCH_PTEP_SET_WRPROTECT |
| 226 | static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, |
| 227 | pte_t *ptep) |
| 228 | { |
| 229 | unsigned long old; |
| 230 | |
| 231 | if ((pte_val(*ptep) & _PAGE_RW) == 0) |
| 232 | return; |
| 233 | old = pte_update(mm, addr, ptep, _PAGE_RW, 0); |
| 234 | } |
| 235 | |
Andy Whitcroft | 016b33c | 2008-06-26 19:55:58 +1000 | [diff] [blame] | 236 | static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| 237 | unsigned long addr, pte_t *ptep) |
| 238 | { |
| 239 | unsigned long old; |
| 240 | |
David Gibson | 86df864 | 2008-07-08 15:58:16 +1000 | [diff] [blame] | 241 | if ((pte_val(*ptep) & _PAGE_RW) == 0) |
| 242 | return; |
Andy Whitcroft | 016b33c | 2008-06-26 19:55:58 +1000 | [diff] [blame] | 243 | old = pte_update(mm, addr, ptep, _PAGE_RW, 1); |
| 244 | } |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 245 | |
| 246 | /* |
| 247 | * We currently remove entries from the hashtable regardless of whether |
| 248 | * the entry was young or dirty. The generic routines only flush if the |
| 249 | * entry was young or dirty which is not good enough. |
| 250 | * |
| 251 | * We should be more intelligent about this but for the moment we override |
| 252 | * these functions and force a tlb flush unconditionally |
| 253 | */ |
| 254 | #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH |
| 255 | #define ptep_clear_flush_young(__vma, __address, __ptep) \ |
| 256 | ({ \ |
| 257 | int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \ |
| 258 | __ptep); \ |
| 259 | __young; \ |
| 260 | }) |
| 261 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 262 | #define __HAVE_ARCH_PTEP_GET_AND_CLEAR |
| 263 | static inline pte_t ptep_get_and_clear(struct mm_struct *mm, |
| 264 | unsigned long addr, pte_t *ptep) |
| 265 | { |
| 266 | unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0); |
| 267 | return __pte(old); |
| 268 | } |
| 269 | |
| 270 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, |
| 271 | pte_t * ptep) |
| 272 | { |
| 273 | pte_update(mm, addr, ptep, ~0UL, 0); |
| 274 | } |
| 275 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 276 | |
| 277 | /* Set the dirty and/or accessed bits atomically in a linux PTE, this |
| 278 | * function doesn't need to flush the hash entry |
| 279 | */ |
Benjamin Herrenschmidt | 8d30c14 | 2009-02-10 16:02:37 +0000 | [diff] [blame] | 280 | static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry) |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 281 | { |
| 282 | unsigned long bits = pte_val(entry) & |
Benjamin Herrenschmidt | 8d1cf34 | 2009-03-19 19:34:08 +0000 | [diff] [blame] | 283 | (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | |
| 284 | _PAGE_EXEC | _PAGE_HWEXEC); |
Benjamin Herrenschmidt | a033a48 | 2009-03-19 19:34:15 +0000 | [diff] [blame^] | 285 | |
| 286 | #ifdef PTE_ATOMIC_UPDATES |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 287 | unsigned long old, tmp; |
| 288 | |
| 289 | __asm__ __volatile__( |
| 290 | "1: ldarx %0,0,%4\n\ |
| 291 | andi. %1,%0,%6\n\ |
| 292 | bne- 1b \n\ |
| 293 | or %0,%3,%0\n\ |
| 294 | stdcx. %0,0,%4\n\ |
| 295 | bne- 1b" |
| 296 | :"=&r" (old), "=&r" (tmp), "=m" (*ptep) |
| 297 | :"r" (bits), "r" (ptep), "m" (*ptep), "i" (_PAGE_BUSY) |
| 298 | :"cc"); |
Benjamin Herrenschmidt | a033a48 | 2009-03-19 19:34:15 +0000 | [diff] [blame^] | 299 | #else |
| 300 | unsigned long old = pte_val(*ptep); |
| 301 | *ptep = __pte(old | bits); |
| 302 | #endif |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 303 | } |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 304 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 305 | #define __HAVE_ARCH_PTE_SAME |
| 306 | #define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HPTEFLAGS) == 0) |
| 307 | |
| 308 | #define pte_ERROR(e) \ |
| 309 | printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) |
| 310 | #define pmd_ERROR(e) \ |
| 311 | printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e)) |
| 312 | #define pgd_ERROR(e) \ |
| 313 | printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) |
| 314 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 315 | /* Encode and de-code a swap entry */ |
| 316 | #define __swp_type(entry) (((entry).val >> 1) & 0x3f) |
| 317 | #define __swp_offset(entry) ((entry).val >> 8) |
| 318 | #define __swp_entry(type, offset) ((swp_entry_t){((type)<< 1)|((offset)<<8)}) |
| 319 | #define __pte_to_swp_entry(pte) ((swp_entry_t){pte_val(pte) >> PTE_RPN_SHIFT}) |
| 320 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val << PTE_RPN_SHIFT }) |
| 321 | #define pte_to_pgoff(pte) (pte_val(pte) >> PTE_RPN_SHIFT) |
| 322 | #define pgoff_to_pte(off) ((pte_t) {((off) << PTE_RPN_SHIFT)|_PAGE_FILE}) |
| 323 | #define PTE_FILE_MAX_BITS (BITS_PER_LONG - PTE_RPN_SHIFT) |
| 324 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 325 | void pgtable_cache_init(void); |
| 326 | |
| 327 | /* |
| 328 | * find_linux_pte returns the address of a linux pte for a given |
| 329 | * effective address and directory. If not found, it returns zero. |
| 330 | */static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea) |
| 331 | { |
| 332 | pgd_t *pg; |
| 333 | pud_t *pu; |
| 334 | pmd_t *pm; |
| 335 | pte_t *pt = NULL; |
| 336 | |
| 337 | pg = pgdir + pgd_index(ea); |
| 338 | if (!pgd_none(*pg)) { |
| 339 | pu = pud_offset(pg, ea); |
| 340 | if (!pud_none(*pu)) { |
| 341 | pm = pmd_offset(pu, ea); |
| 342 | if (pmd_present(*pm)) |
| 343 | pt = pte_offset_kernel(pm, ea); |
| 344 | } |
| 345 | } |
| 346 | return pt; |
| 347 | } |
| 348 | |
Nick Piggin | ce0ad7f | 2008-07-30 15:23:13 +1000 | [diff] [blame] | 349 | pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long address); |
| 350 | |
David Gibson | f88df14 | 2007-04-30 16:30:56 +1000 | [diff] [blame] | 351 | #endif /* __ASSEMBLY__ */ |
| 352 | |
| 353 | #endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */ |