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

   1#ifndef _ASM_SCORE_PGTABLE_H
   2#define _ASM_SCORE_PGTABLE_H
   3
   4#include <linux/const.h>
   5#include <asm-generic/pgtable-nopmd.h>
   6
   7#include <asm/fixmap.h>
   8#include <asm/setup.h>
   9#include <asm/pgtable-bits.h>
  10
  11extern void load_pgd(unsigned long pg_dir);
  12extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
  13
  14/* PGDIR_SHIFT determines what a third-level page table entry can map */
  15#define PGDIR_SHIFT     22
  16#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
  17#define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  18
  19/*
  20 * Entries per page directory level: we use two-level, so
  21 * we don't really have any PUD/PMD directory physically.
  22 */
  23#define PGD_ORDER       0
  24#define PTE_ORDER       0
  25
  26#define PTRS_PER_PGD    1024
  27#define PTRS_PER_PTE    1024
  28
  29#define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  30#define FIRST_USER_ADDRESS      0
  31
  32#define VMALLOC_START           (0xc0000000UL)
  33
  34#define PKMAP_BASE              (0xfd000000UL)
  35
  36#define VMALLOC_END             (FIXADDR_START - 2*PAGE_SIZE)
  37
  38#define pte_ERROR(e) \
  39        printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
  40                __FILE__, __LINE__, pte_val(e))
  41#define pgd_ERROR(e) \
  42        printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
  43                __FILE__, __LINE__, pgd_val(e))
  44
  45/*
  46 * Empty pgd/pmd entries point to the invalid_pte_table.
  47 */
  48static inline int pmd_none(pmd_t pmd)
  49{
  50        return pmd_val(pmd) == (unsigned long) invalid_pte_table;
  51}
  52
  53#define pmd_bad(pmd)            (pmd_val(pmd) & ~PAGE_MASK)
  54
  55static inline int pmd_present(pmd_t pmd)
  56{
  57        return pmd_val(pmd) != (unsigned long) invalid_pte_table;
  58}
  59
  60static inline void pmd_clear(pmd_t *pmdp)
  61{
  62        pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
  63}
  64
  65#define pte_page(x)             pfn_to_page(pte_pfn(x))
  66#define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
  67#define pfn_pte(pfn, prot)      \
  68        __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
  69
  70#define __pgd_offset(address)   pgd_index(address)
  71#define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
  72#define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
  73
  74/* to find an entry in a kernel page-table-directory */
  75#define pgd_offset_k(address)   pgd_offset(&init_mm, address)
  76#define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
  77
  78/* to find an entry in a page-table-directory */
  79#define pgd_offset(mm, addr)    ((mm)->pgd + pgd_index(addr))
  80
  81/* Find an entry in the third-level page table.. */
  82#define __pte_offset(address)           \
  83        (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
  84#define pte_offset(dir, address)        \
  85        ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
  86#define pte_offset_kernel(dir, address) \
  87        ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
  88
  89#define pte_offset_map(dir, address)    \
  90        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
  91#define pte_unmap(pte) ((void)(pte))
  92
  93/*
  94 * Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
  95 * split up 30 bits of offset into this range:
  96 */
  97#define PTE_FILE_MAX_BITS       30
  98#define pte_to_pgoff(_pte)              \
  99        (((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
 100#define pgoff_to_pte(off)               \
 101        ((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
 102#define __pte_to_swp_entry(pte)         \
 103        ((swp_entry_t) { pte_val(pte)})
 104#define __swp_entry_to_pte(x)   ((pte_t) {(x).val})
 105
 106#define pmd_phys(pmd)           __pa((void *)pmd_val(pmd))
 107#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 108#define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
 109static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 110
 111#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 112#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 113#define pte_clear(mm, addr, xp)         \
 114        do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 115
 116/*
 117 * The "pgd_xxx()" functions here are trivial for a folded two-level
 118 * setup: the pgd is never bad, and a pmd always exists (as it's folded
 119 * into the pgd entry)
 120 */
 121#define pgd_present(pgd)        (1)
 122#define pgd_none(pgd)           (0)
 123#define pgd_bad(pgd)            (0)
 124#define pgd_clear(pgdp)         do { } while (0)
 125
 126#define kern_addr_valid(addr)   (1)
 127#define pmd_page_vaddr(pmd)     pmd_val(pmd)
 128
 129#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 130#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 131
 132#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
 133#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 134                                _PAGE_CACHE)
 135#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 136#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 137#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
 138                                _PAGE_GLOBAL | _PAGE_CACHE)
 139#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
 140                                __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
 141
 142#define __P000  PAGE_NONE
 143#define __P001  PAGE_READONLY
 144#define __P010  PAGE_COPY
 145#define __P011  PAGE_COPY
 146#define __P100  PAGE_READONLY
 147#define __P101  PAGE_READONLY
 148#define __P110  PAGE_COPY
 149#define __P111  PAGE_COPY
 150
 151#define __S000  PAGE_NONE
 152#define __S001  PAGE_READONLY
 153#define __S010  PAGE_SHARED
 154#define __S011  PAGE_SHARED
 155#define __S100  PAGE_READONLY
 156#define __S101  PAGE_READONLY
 157#define __S110  PAGE_SHARED
 158#define __S111  PAGE_SHARED
 159
 160#define pgprot_noncached pgprot_noncached
 161
 162static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 163{
 164        unsigned long prot = pgprot_val(_prot);
 165
 166        prot = (prot & ~_CACHE_MASK);
 167
 168        return __pgprot(prot);
 169}
 170
 171#define __swp_type(x)           ((x).val & 0x1f)
 172#define __swp_offset(x)         ((x).val >> 11)
 173#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 11)})
 174
 175extern unsigned long empty_zero_page;
 176extern unsigned long zero_page_mask;
 177
 178#define ZERO_PAGE(vaddr) \
 179        (virt_to_page((void *)(empty_zero_page + \
 180         (((unsigned long)(vaddr)) & zero_page_mask))))
 181
 182#define pgtable_cache_init()    do {} while (0)
 183
 184#define arch_enter_lazy_cpu_mode()      do {} while (0)
 185
 186static inline int pte_write(pte_t pte)
 187{
 188        return pte_val(pte) & _PAGE_WRITE;
 189}
 190
 191static inline int pte_dirty(pte_t pte)
 192{
 193        return pte_val(pte) & _PAGE_MODIFIED;
 194}
 195
 196static inline int pte_young(pte_t pte)
 197{
 198        return pte_val(pte) & _PAGE_ACCESSED;
 199}
 200
 201static inline int pte_file(pte_t pte)
 202{
 203        return pte_val(pte) & _PAGE_FILE;
 204}
 205
 206#define pte_special(pte)        (0)
 207
 208static inline pte_t pte_wrprotect(pte_t pte)
 209{
 210        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 211        return pte;
 212}
 213
 214static inline pte_t pte_mkclean(pte_t pte)
 215{
 216        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 217        return pte;
 218}
 219
 220static inline pte_t pte_mkold(pte_t pte)
 221{
 222        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 223        return pte;
 224}
 225
 226static inline pte_t pte_mkwrite(pte_t pte)
 227{
 228        pte_val(pte) |= _PAGE_WRITE;
 229        if (pte_val(pte) & _PAGE_MODIFIED)
 230                pte_val(pte) |= _PAGE_SILENT_WRITE;
 231        return pte;
 232}
 233
 234static inline pte_t pte_mkdirty(pte_t pte)
 235{
 236        pte_val(pte) |= _PAGE_MODIFIED;
 237        if (pte_val(pte) & _PAGE_WRITE)
 238                pte_val(pte) |= _PAGE_SILENT_WRITE;
 239        return pte;
 240}
 241
 242static inline pte_t pte_mkyoung(pte_t pte)
 243{
 244        pte_val(pte) |= _PAGE_ACCESSED;
 245        if (pte_val(pte) & _PAGE_READ)
 246                pte_val(pte) |= _PAGE_SILENT_READ;
 247        return pte;
 248}
 249
 250#define set_pmd(pmdptr, pmdval)         \
 251         do { *(pmdptr) = (pmdval); } while (0)
 252#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 253
 254extern unsigned long pgd_current;
 255extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 256extern void paging_init(void);
 257
 258static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 259{
 260        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 261}
 262
 263extern void __update_tlb(struct vm_area_struct *vma,
 264        unsigned long address,  pte_t pte);
 265extern void __update_cache(struct vm_area_struct *vma,
 266        unsigned long address,  pte_t pte);
 267
 268static inline void update_mmu_cache(struct vm_area_struct *vma,
 269        unsigned long address, pte_t *ptep)
 270{
 271        pte_t pte = *ptep;
 272        __update_tlb(vma, address, pte);
 273        __update_cache(vma, address, pte);
 274}
 275
 276#ifndef __ASSEMBLY__
 277#include <asm-generic/pgtable.h>
 278
 279void setup_memory(void);
 280#endif /* __ASSEMBLY__ */
 281
 282#endif /* _ASM_SCORE_PGTABLE_H */
 283