LXR linux/arch/arm64/include/asm/pgtable.h

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __ASM_PGTABLE_H
  17#define __ASM_PGTABLE_H
  18
  19#include <asm/proc-fns.h>
  20
  21#include <asm/memory.h>
  22#include <asm/pgtable-hwdef.h>
  23
  24/*
  25 * Software defined PTE bits definition.
  26 */
  27#define PTE_VALID               (_AT(pteval_t, 1) << 0)
  28#define PTE_PROT_NONE           (_AT(pteval_t, 1) << 1) /* only when !PTE_VALID */
  29#define PTE_FILE                (_AT(pteval_t, 1) << 2) /* only when !pte_present() */
  30#define PTE_DIRTY               (_AT(pteval_t, 1) << 55)
  31#define PTE_SPECIAL             (_AT(pteval_t, 1) << 56)
  32
  33/*
  34 * VMALLOC and SPARSEMEM_VMEMMAP ranges.
  35 */
  36#define VMALLOC_START           UL(0xffffff8000000000)
  37#define VMALLOC_END             (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
  38
  39#define vmemmap                 ((struct page *)(VMALLOC_END + SZ_64K))
  40
  41#define FIRST_USER_ADDRESS      0
  42
  43#ifndef __ASSEMBLY__
  44extern void __pte_error(const char *file, int line, unsigned long val);
  45extern void __pmd_error(const char *file, int line, unsigned long val);
  46extern void __pgd_error(const char *file, int line, unsigned long val);
  47
  48#define pte_ERROR(pte)          __pte_error(__FILE__, __LINE__, pte_val(pte))
  49#ifndef CONFIG_ARM64_64K_PAGES
  50#define pmd_ERROR(pmd)          __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
  51#endif
  52#define pgd_ERROR(pgd)          __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
  53
  54/*
  55 * The pgprot_* and protection_map entries will be fixed up at runtime to
  56 * include the cachable and bufferable bits based on memory policy, as well as
  57 * any architecture dependent bits like global/ASID and SMP shared mapping
  58 * bits.
  59 */
  60#define _PAGE_DEFAULT           PTE_TYPE_PAGE | PTE_AF
  61
  62extern pgprot_t pgprot_default;
  63
  64#define __pgprot_modify(prot,mask,bits) \
  65        __pgprot((pgprot_val(prot) & ~(mask)) | (bits))
  66
  67#define _MOD_PROT(p, b)         __pgprot_modify(p, 0, b)
  68
  69#define PAGE_NONE               __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE)
  70#define PAGE_SHARED             _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
  71#define PAGE_SHARED_EXEC        _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
  72#define PAGE_COPY               _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
  73#define PAGE_COPY_EXEC          _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
  74#define PAGE_READONLY           _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
  75#define PAGE_READONLY_EXEC      _MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
  76#define PAGE_KERNEL             _MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY)
  77#define PAGE_KERNEL_EXEC        _MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY)
  78
  79#define __PAGE_NONE             __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE)
  80#define __PAGE_SHARED           __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
  81#define __PAGE_SHARED_EXEC      __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
  82#define __PAGE_COPY             __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
  83#define __PAGE_COPY_EXEC        __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
  84#define __PAGE_READONLY         __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
  85#define __PAGE_READONLY_EXEC    __pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
  86
  87#endif /* __ASSEMBLY__ */
  88
  89#define __P000  __PAGE_NONE
  90#define __P001  __PAGE_READONLY
  91#define __P010  __PAGE_COPY
  92#define __P011  __PAGE_COPY
  93#define __P100  __PAGE_READONLY_EXEC
  94#define __P101  __PAGE_READONLY_EXEC
  95#define __P110  __PAGE_COPY_EXEC
  96#define __P111  __PAGE_COPY_EXEC
  97
  98#define __S000  __PAGE_NONE
  99#define __S001  __PAGE_READONLY
 100#define __S010  __PAGE_SHARED
 101#define __S011  __PAGE_SHARED
 102#define __S100  __PAGE_READONLY_EXEC
 103#define __S101  __PAGE_READONLY_EXEC
 104#define __S110  __PAGE_SHARED_EXEC
 105#define __S111  __PAGE_SHARED_EXEC
 106
 107#ifndef __ASSEMBLY__
 108/*
 109 * ZERO_PAGE is a global shared page that is always zero: used
 110 * for zero-mapped memory areas etc..
 111 */
 112extern struct page *empty_zero_page;
 113#define ZERO_PAGE(vaddr)        (empty_zero_page)
 114
 115#define pte_pfn(pte)            ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
 116
 117#define pfn_pte(pfn,prot)       (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
 118
 119#define pte_none(pte)           (!pte_val(pte))
 120#define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
 121#define pte_page(pte)           (pfn_to_page(pte_pfn(pte)))
 122#define pte_offset_kernel(dir,addr)     (pmd_page_vaddr(*(dir)) + __pte_index(addr))
 123
 124#define pte_offset_map(dir,addr)        pte_offset_kernel((dir), (addr))
 125#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
 126#define pte_unmap(pte)                  do { } while (0)
 127#define pte_unmap_nested(pte)           do { } while (0)
 128
 129/*
 130 * The following only work if pte_present(). Undefined behaviour otherwise.
 131 */
 132#define pte_present(pte)        (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))
 133#define pte_dirty(pte)          (pte_val(pte) & PTE_DIRTY)
 134#define pte_young(pte)          (pte_val(pte) & PTE_AF)
 135#define pte_special(pte)        (pte_val(pte) & PTE_SPECIAL)
 136#define pte_write(pte)          (!(pte_val(pte) & PTE_RDONLY))
 137#define pte_exec(pte)           (!(pte_val(pte) & PTE_UXN))
 138
 139#define pte_valid_user(pte) \
 140        ((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
 141
 142#define PTE_BIT_FUNC(fn,op) \
 143static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
 144
 145PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY);
 146PTE_BIT_FUNC(mkwrite,   &= ~PTE_RDONLY);
 147PTE_BIT_FUNC(mkclean,   &= ~PTE_DIRTY);
 148PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
 149PTE_BIT_FUNC(mkold,     &= ~PTE_AF);
 150PTE_BIT_FUNC(mkyoung,   |= PTE_AF);
 151PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL);
 152
 153static inline void set_pte(pte_t *ptep, pte_t pte)
 154{
 155        *ptep = pte;
 156}
 157
 158extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
 159
 160static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
 161                              pte_t *ptep, pte_t pte)
 162{
 163        if (pte_valid_user(pte)) {
 164                if (pte_exec(pte))
 165                        __sync_icache_dcache(pte, addr);
 166                if (!pte_dirty(pte))
 167                        pte = pte_wrprotect(pte);
 168        }
 169
 170        set_pte(ptep, pte);
 171}
 172
 173/*
 174 * Huge pte definitions.
 175 */
 176#define pte_huge(pte)           ((pte_val(pte) & PTE_TYPE_MASK) == PTE_TYPE_HUGEPAGE)
 177#define pte_mkhuge(pte)         (__pte((pte_val(pte) & ~PTE_TYPE_MASK) | PTE_TYPE_HUGEPAGE))
 178
 179#define __HAVE_ARCH_PTE_SPECIAL
 180
 181/*
 182 * Mark the prot value as uncacheable and unbufferable.
 183 */
 184#define pgprot_noncached(prot) \
 185        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
 186#define pgprot_writecombine(prot) \
 187        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
 188#define pgprot_dmacoherent(prot) \
 189        __pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
 190#define __HAVE_PHYS_MEM_ACCESS_PROT
 191struct file;
 192extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 193                                     unsigned long size, pgprot_t vma_prot);
 194
 195#define pmd_none(pmd)           (!pmd_val(pmd))
 196#define pmd_present(pmd)        (pmd_val(pmd))
 197
 198#define pmd_bad(pmd)            (!(pmd_val(pmd) & 2))
 199
 200static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
 201{
 202        *pmdp = pmd;
 203        dsb();
 204}
 205
 206static inline void pmd_clear(pmd_t *pmdp)
 207{
 208        set_pmd(pmdp, __pmd(0));
 209}
 210
 211static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 212{
 213        return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
 214}
 215
 216#define pmd_page(pmd)           pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
 217
 218/*
 219 * Conversion functions: convert a page and protection to a page entry,
 220 * and a page entry and page directory to the page they refer to.
 221 */
 222#define mk_pte(page,prot)       pfn_pte(page_to_pfn(page),prot)
 223
 224#ifndef CONFIG_ARM64_64K_PAGES
 225
 226#define pud_none(pud)           (!pud_val(pud))
 227#define pud_bad(pud)            (!(pud_val(pud) & 2))
 228#define pud_present(pud)        (pud_val(pud))
 229
 230static inline void set_pud(pud_t *pudp, pud_t pud)
 231{
 232        *pudp = pud;
 233        dsb();
 234}
 235
 236static inline void pud_clear(pud_t *pudp)
 237{
 238        set_pud(pudp, __pud(0));
 239}
 240
 241static inline pmd_t *pud_page_vaddr(pud_t pud)
 242{
 243        return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
 244}
 245
 246#endif  /* CONFIG_ARM64_64K_PAGES */
 247
 248/* to find an entry in a page-table-directory */
 249#define pgd_index(addr)         (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
 250
 251#define pgd_offset(mm, addr)    ((mm)->pgd+pgd_index(addr))
 252
 253/* to find an entry in a kernel page-table-directory */
 254#define pgd_offset_k(addr)      pgd_offset(&init_mm, addr)
 255
 256/* Find an entry in the second-level page table.. */
 257#ifndef CONFIG_ARM64_64K_PAGES
 258#define pmd_index(addr)         (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
 259static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 260{
 261        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
 262}
 263#endif
 264
 265/* Find an entry in the third-level page table.. */
 266#define __pte_index(addr)       (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 267
 268static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 269{
 270        const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
 271                              PTE_PROT_NONE | PTE_VALID;
 272        pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 273        return pte;
 274}
 275
 276extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 277extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
 278
 279#define SWAPPER_DIR_SIZE        (3 * PAGE_SIZE)
 280#define IDMAP_DIR_SIZE          (2 * PAGE_SIZE)
 281
 282/*
 283 * Encode and decode a swap entry:
 284 *      bits 0-1:       present (must be zero)
 285 *      bit  2:         PTE_FILE
 286 *      bits 3-8:       swap type
 287 *      bits 9-63:      swap offset
 288 */
 289#define __SWP_TYPE_SHIFT        3
 290#define __SWP_TYPE_BITS         6
 291#define __SWP_TYPE_MASK         ((1 << __SWP_TYPE_BITS) - 1)
 292#define __SWP_OFFSET_SHIFT      (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
 293
 294#define __swp_type(x)           (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
 295#define __swp_offset(x)         ((x).val >> __SWP_OFFSET_SHIFT)
 296#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
 297
 298#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 299#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
 300
 301/*
 302 * Ensure that there are not more swap files than can be encoded in the kernel
 303 * the PTEs.
 304 */
 305#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
 306
 307/*
 308 * Encode and decode a file entry:
 309 *      bits 0-1:       present (must be zero)
 310 *      bit  2:         PTE_FILE
 311 *      bits 3-63:      file offset / PAGE_SIZE
 312 */
 313#define pte_file(pte)           (pte_val(pte) & PTE_FILE)
 314#define pte_to_pgoff(x)         (pte_val(x) >> 3)
 315#define pgoff_to_pte(x)         __pte(((x) << 3) | PTE_FILE)
 316
 317#define PTE_FILE_MAX_BITS       61
 318
 319extern int kern_addr_valid(unsigned long addr);
 320
 321#include <asm-generic/pgtable.h>
 322
 323/*
 324 * remap a physical page `pfn' of size `size' with page protection `prot'
 325 * into virtual address `from'
 326 */
 327#define io_remap_pfn_range(vma,from,pfn,size,prot) \
 328                remap_pfn_range(vma, from, pfn, size, prot)
 329
 330#define pgtable_cache_init() do { } while (0)
 331
 332#endif /* !__ASSEMBLY__ */
 333
 334#endif /* __ASM_PGTABLE_H */
 335