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_offset_map_nested(dir, address)     \
  92        ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
  93#define pte_unmap(pte) ((void)(pte))
  94#define pte_unmap_nested(pte) ((void)(pte))
  95
  96/*
  97 * Bits 9(_PAGE_PRESENT) and 10(_PAGE_FILE)are taken,
  98 * split up 30 bits of offset into this range:
  99 */
 100#define PTE_FILE_MAX_BITS       30
 101#define pte_to_pgoff(_pte)              \
 102        (((_pte).pte & 0x1ff) | (((_pte).pte >> 11) << 9))
 103#define pgoff_to_pte(off)               \
 104        ((pte_t) {((off) & 0x1ff) | (((off) >> 9) << 11) | _PAGE_FILE})
 105#define __pte_to_swp_entry(pte)         \
 106        ((swp_entry_t) { pte_val(pte)})
 107#define __swp_entry_to_pte(x)   ((pte_t) {(x).val})
 108
 109#define pmd_phys(pmd)           __pa((void *)pmd_val(pmd))
 110#define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 111#define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
 112static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 113
 114#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 115#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 116#define pte_clear(mm, addr, xp)         \
 117        do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 118
 119#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)         \
 120                remap_pfn_range(vma, vaddr, pfn, size, prot)
 121
 122/*
 123 * The "pgd_xxx()" functions here are trivial for a folded two-level
 124 * setup: the pgd is never bad, and a pmd always exists (as it's folded
 125 * into the pgd entry)
 126 */
 127#define pgd_present(pgd)        (1)
 128#define pgd_none(pgd)           (0)
 129#define pgd_bad(pgd)            (0)
 130#define pgd_clear(pgdp)         do { } while (0)
 131
 132#define kern_addr_valid(addr)   (1)
 133#define pmd_page_vaddr(pmd)     pmd_val(pmd)
 134
 135#define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 136#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 137
 138#define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
 139#define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 140                                _PAGE_CACHE)
 141#define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 142#define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 143#define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
 144                                _PAGE_GLOBAL | _PAGE_CACHE)
 145#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
 146                                __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
 147
 148#define __P000  PAGE_NONE
 149#define __P001  PAGE_READONLY
 150#define __P010  PAGE_COPY
 151#define __P011  PAGE_COPY
 152#define __P100  PAGE_READONLY
 153#define __P101  PAGE_READONLY
 154#define __P110  PAGE_COPY
 155#define __P111  PAGE_COPY
 156
 157#define __S000  PAGE_NONE
 158#define __S001  PAGE_READONLY
 159#define __S010  PAGE_SHARED
 160#define __S011  PAGE_SHARED
 161#define __S100  PAGE_READONLY
 162#define __S101  PAGE_READONLY
 163#define __S110  PAGE_SHARED
 164#define __S111  PAGE_SHARED
 165
 166#define pgprot_noncached pgprot_noncached
 167
 168static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 169{
 170        unsigned long prot = pgprot_val(_prot);
 171
 172        prot = (prot & ~_CACHE_MASK);
 173
 174        return __pgprot(prot);
 175}
 176
 177#define __swp_type(x)           ((x).val & 0x1f)
 178#define __swp_offset(x)         ((x).val >> 11)
 179#define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 11)})
 180
 181extern unsigned long empty_zero_page;
 182extern unsigned long zero_page_mask;
 183
 184#define ZERO_PAGE(vaddr) \
 185        (virt_to_page((void *)(empty_zero_page + \
 186         (((unsigned long)(vaddr)) & zero_page_mask))))
 187
 188#define pgtable_cache_init()    do {} while (0)
 189
 190#define arch_enter_lazy_cpu_mode()      do {} while (0)
 191
 192static inline int pte_write(pte_t pte)
 193{
 194        return pte_val(pte) & _PAGE_WRITE;
 195}
 196
 197static inline int pte_dirty(pte_t pte)
 198{
 199        return pte_val(pte) & _PAGE_MODIFIED;
 200}
 201
 202static inline int pte_young(pte_t pte)
 203{
 204        return pte_val(pte) & _PAGE_ACCESSED;
 205}
 206
 207static inline int pte_file(pte_t pte)
 208{
 209        return pte_val(pte) & _PAGE_FILE;
 210}
 211
 212#define pte_special(pte)        (0)
 213
 214static inline pte_t pte_wrprotect(pte_t pte)
 215{
 216        pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 217        return pte;
 218}
 219
 220static inline pte_t pte_mkclean(pte_t pte)
 221{
 222        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 223        return pte;
 224}
 225
 226static inline pte_t pte_mkold(pte_t pte)
 227{
 228        pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 229        return pte;
 230}
 231
 232static inline pte_t pte_mkwrite(pte_t pte)
 233{
 234        pte_val(pte) |= _PAGE_WRITE;
 235        if (pte_val(pte) & _PAGE_MODIFIED)
 236                pte_val(pte) |= _PAGE_SILENT_WRITE;
 237        return pte;
 238}
 239
 240static inline pte_t pte_mkdirty(pte_t pte)
 241{
 242        pte_val(pte) |= _PAGE_MODIFIED;
 243        if (pte_val(pte) & _PAGE_WRITE)
 244                pte_val(pte) |= _PAGE_SILENT_WRITE;
 245        return pte;
 246}
 247
 248static inline pte_t pte_mkyoung(pte_t pte)
 249{
 250        pte_val(pte) |= _PAGE_ACCESSED;
 251        if (pte_val(pte) & _PAGE_READ)
 252                pte_val(pte) |= _PAGE_SILENT_READ;
 253        return pte;
 254}
 255
 256#define set_pmd(pmdptr, pmdval)         \
 257         do { *(pmdptr) = (pmdval); } while (0)
 258#define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 259
 260extern unsigned long pgd_current;
 261extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 262extern void paging_init(void);
 263
 264static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 265{
 266        return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 267}
 268
 269extern void __update_tlb(struct vm_area_struct *vma,
 270        unsigned long address,  pte_t pte);
 271extern void __update_cache(struct vm_area_struct *vma,
 272        unsigned long address,  pte_t pte);
 273
 274static inline void update_mmu_cache(struct vm_area_struct *vma,
 275        unsigned long address, pte_t pte)
 276{
 277        __update_tlb(vma, address, pte);
 278        __update_cache(vma, address, pte);
 279}
 280
 281#ifndef __ASSEMBLY__
 282#include <asm-generic/pgtable.h>
 283
 284void setup_memory(void);
 285#endif /* __ASSEMBLY__ */
 286
 287#endif /* _ASM_SCORE_PGTABLE_H */
 288