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
  11 extern void load_pgd(unsigned long pg_dir);
  12 extern 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      0UL
  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  */
  48 static 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
  55 static inline int pmd_present(pmd_t pmd)
  56 {
  57         return pmd_val(pmd) != (unsigned long) invalid_pte_table;
  58 }
  59
  60 static 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 #define __pte_to_swp_entry(pte)         \
  94         ((swp_entry_t) { pte_val(pte)})
  95 #define __swp_entry_to_pte(x)   ((pte_t) {(x).val})
  96
  97 #define pmd_phys(pmd)           __pa((void *)pmd_val(pmd))
  98 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  99 #define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
 100 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 101
 102 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 103 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 104 #define pte_clear(mm, addr, xp)         \
 105         do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 106
 107 /*
 108  * The "pgd_xxx()" functions here are trivial for a folded two-level
 109  * setup: the pgd is never bad, and a pmd always exists (as it's folded
 110  * into the pgd entry)
 111  */
 112 #define pgd_present(pgd)        (1)
 113 #define pgd_none(pgd)           (0)
 114 #define pgd_bad(pgd)            (0)
 115 #define pgd_clear(pgdp)         do { } while (0)
 116
 117 #define kern_addr_valid(addr)   (1)
 118 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
 119
 120 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 121 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 122
 123 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
 124 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 125                                 _PAGE_CACHE)
 126 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 127 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 128 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
 129                                 _PAGE_GLOBAL | _PAGE_CACHE)
 130 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
 131                                 __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
 132
 133 #define __P000  PAGE_NONE
 134 #define __P001  PAGE_READONLY
 135 #define __P010  PAGE_COPY
 136 #define __P011  PAGE_COPY
 137 #define __P100  PAGE_READONLY
 138 #define __P101  PAGE_READONLY
 139 #define __P110  PAGE_COPY
 140 #define __P111  PAGE_COPY
 141
 142 #define __S000  PAGE_NONE
 143 #define __S001  PAGE_READONLY
 144 #define __S010  PAGE_SHARED
 145 #define __S011  PAGE_SHARED
 146 #define __S100  PAGE_READONLY
 147 #define __S101  PAGE_READONLY
 148 #define __S110  PAGE_SHARED
 149 #define __S111  PAGE_SHARED
 150
 151 #define pgprot_noncached pgprot_noncached
 152
 153 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 154 {
 155         unsigned long prot = pgprot_val(_prot);
 156
 157         prot = (prot & ~_CACHE_MASK);
 158
 159         return __pgprot(prot);
 160 }
 161
 162 #define __swp_type(x)           ((x).val & 0x1f)
 163 #define __swp_offset(x)         ((x).val >> 10)
 164 #define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})
 165
 166 extern unsigned long empty_zero_page;
 167 extern unsigned long zero_page_mask;
 168
 169 #define ZERO_PAGE(vaddr) \
 170         (virt_to_page((void *)(empty_zero_page + \
 171          (((unsigned long)(vaddr)) & zero_page_mask))))
 172
 173 #define pgtable_cache_init()    do {} while (0)
 174
 175 #define arch_enter_lazy_cpu_mode()      do {} while (0)
 176
 177 static inline int pte_write(pte_t pte)
 178 {
 179         return pte_val(pte) & _PAGE_WRITE;
 180 }
 181
 182 static inline int pte_dirty(pte_t pte)
 183 {
 184         return pte_val(pte) & _PAGE_MODIFIED;
 185 }
 186
 187 static inline int pte_young(pte_t pte)
 188 {
 189         return pte_val(pte) & _PAGE_ACCESSED;
 190 }
 191
 192 #define pte_special(pte)        (0)
 193
 194 static inline pte_t pte_wrprotect(pte_t pte)
 195 {
 196         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 197         return pte;
 198 }
 199
 200 static inline pte_t pte_mkclean(pte_t pte)
 201 {
 202         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 203         return pte;
 204 }
 205
 206 static inline pte_t pte_mkold(pte_t pte)
 207 {
 208         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 209         return pte;
 210 }
 211
 212 static inline pte_t pte_mkwrite(pte_t pte)
 213 {
 214         pte_val(pte) |= _PAGE_WRITE;
 215         if (pte_val(pte) & _PAGE_MODIFIED)
 216                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 217         return pte;
 218 }
 219
 220 static inline pte_t pte_mkdirty(pte_t pte)
 221 {
 222         pte_val(pte) |= _PAGE_MODIFIED;
 223         if (pte_val(pte) & _PAGE_WRITE)
 224                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 225         return pte;
 226 }
 227
 228 static inline pte_t pte_mkyoung(pte_t pte)
 229 {
 230         pte_val(pte) |= _PAGE_ACCESSED;
 231         if (pte_val(pte) & _PAGE_READ)
 232                 pte_val(pte) |= _PAGE_SILENT_READ;
 233         return pte;
 234 }
 235
 236 #define set_pmd(pmdptr, pmdval)         \
 237          do { *(pmdptr) = (pmdval); } while (0)
 238 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 239
 240 extern unsigned long pgd_current;
 241 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 242 extern void paging_init(void);
 243
 244 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 245 {
 246         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 247 }
 248
 249 extern void __update_tlb(struct vm_area_struct *vma,
 250         unsigned long address,  pte_t pte);
 251 extern void __update_cache(struct vm_area_struct *vma,
 252         unsigned long address,  pte_t pte);
 253
 254 static inline void update_mmu_cache(struct vm_area_struct *vma,
 255         unsigned long address, pte_t *ptep)
 256 {
 257         pte_t pte = *ptep;
 258         __update_tlb(vma, address, pte);
 259         __update_cache(vma, address, pte);
 260 }
 261
 262 #ifndef __ASSEMBLY__
 263 #include <asm-generic/pgtable.h>
 264
 265 void setup_memory(void);
 266 #endif /* __ASSEMBLY__ */
 267
 268 #endif /* _ASM_SCORE_PGTABLE_H */