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 #define __ARCH_USE_5LEVEL_HACK
   6 #include <asm-generic/pgtable-nopmd.h>
   7
   8 #include <asm/fixmap.h>
   9 #include <asm/setup.h>
  10 #include <asm/pgtable-bits.h>
  11
  12 extern void load_pgd(unsigned long pg_dir);
  13 extern pte_t invalid_pte_table[PAGE_SIZE/sizeof(pte_t)];
  14
  15 /* PGDIR_SHIFT determines what a third-level page table entry can map */
  16 #define PGDIR_SHIFT     22
  17 #define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
  18 #define PGDIR_MASK      (~(PGDIR_SIZE - 1))
  19
  20 /*
  21  * Entries per page directory level: we use two-level, so
  22  * we don't really have any PUD/PMD directory physically.
  23  */
  24 #define PGD_ORDER       0
  25 #define PTE_ORDER       0
  26
  27 #define PTRS_PER_PGD    1024
  28 #define PTRS_PER_PTE    1024
  29
  30 #define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  31 #define FIRST_USER_ADDRESS      0UL
  32
  33 #define VMALLOC_START           (0xc0000000UL)
  34
  35 #define PKMAP_BASE              (0xfd000000UL)
  36
  37 #define VMALLOC_END             (FIXADDR_START - 2*PAGE_SIZE)
  38
  39 #define pte_ERROR(e) \
  40         printk(KERN_ERR "%s:%d: bad pte %08lx.\n", \
  41                 __FILE__, __LINE__, pte_val(e))
  42 #define pgd_ERROR(e) \
  43         printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
  44                 __FILE__, __LINE__, pgd_val(e))
  45
  46 /*
  47  * Empty pgd/pmd entries point to the invalid_pte_table.
  48  */
  49 static inline int pmd_none(pmd_t pmd)
  50 {
  51         return pmd_val(pmd) == (unsigned long) invalid_pte_table;
  52 }
  53
  54 #define pmd_bad(pmd)            (pmd_val(pmd) & ~PAGE_MASK)
  55
  56 static inline int pmd_present(pmd_t pmd)
  57 {
  58         return pmd_val(pmd) != (unsigned long) invalid_pte_table;
  59 }
  60
  61 static inline void pmd_clear(pmd_t *pmdp)
  62 {
  63         pmd_val(*pmdp) = ((unsigned long) invalid_pte_table);
  64 }
  65
  66 #define pte_page(x)             pfn_to_page(pte_pfn(x))
  67 #define pte_pfn(x)              ((unsigned long)((x).pte >> PAGE_SHIFT))
  68 #define pfn_pte(pfn, prot)      \
  69         __pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
  70
  71 #define __pgd_offset(address)   pgd_index(address)
  72 #define __pud_offset(address)   (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
  73 #define __pmd_offset(address)   (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
  74
  75 /* to find an entry in a kernel page-table-directory */
  76 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
  77 #define pgd_index(address)      (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
  78
  79 /* to find an entry in a page-table-directory */
  80 #define pgd_offset(mm, addr)    ((mm)->pgd + pgd_index(addr))
  81
  82 /* Find an entry in the third-level page table.. */
  83 #define __pte_offset(address)           \
  84         (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
  85 #define pte_offset(dir, address)        \
  86         ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
  87 #define pte_offset_kernel(dir, address) \
  88         ((pte_t *) pmd_page_vaddr(*(dir)) + __pte_offset(address))
  89
  90 #define pte_offset_map(dir, address)    \
  91         ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset(address))
  92 #define pte_unmap(pte) ((void)(pte))
  93
  94 #define __pte_to_swp_entry(pte)         \
  95         ((swp_entry_t) { pte_val(pte)})
  96 #define __swp_entry_to_pte(x)   ((pte_t) {(x).val})
  97
  98 #define pmd_phys(pmd)           __pa((void *)pmd_val(pmd))
  99 #define pmd_page(pmd)           (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
 100 #define mk_pte(page, prot)      pfn_pte(page_to_pfn(page), prot)
 101 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 102
 103 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
 104 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 105 #define pte_clear(mm, addr, xp)         \
 106         do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
 107
 108 /*
 109  * The "pgd_xxx()" functions here are trivial for a folded two-level
 110  * setup: the pgd is never bad, and a pmd always exists (as it's folded
 111  * into the pgd entry)
 112  */
 113 #define pgd_present(pgd)        (1)
 114 #define pgd_none(pgd)           (0)
 115 #define pgd_bad(pgd)            (0)
 116 #define pgd_clear(pgdp)         do { } while (0)
 117
 118 #define kern_addr_valid(addr)   (1)
 119 #define pmd_page_vaddr(pmd)     pmd_val(pmd)
 120
 121 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
 122 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 123
 124 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _PAGE_CACHE)
 125 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 126                                 _PAGE_CACHE)
 127 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 128 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_CACHE)
 129 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
 130                                 _PAGE_GLOBAL | _PAGE_CACHE)
 131 #define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
 132                                 __WRITEABLE | _PAGE_GLOBAL & ~_PAGE_CACHE)
 133
 134 #define __P000  PAGE_NONE
 135 #define __P001  PAGE_READONLY
 136 #define __P010  PAGE_COPY
 137 #define __P011  PAGE_COPY
 138 #define __P100  PAGE_READONLY
 139 #define __P101  PAGE_READONLY
 140 #define __P110  PAGE_COPY
 141 #define __P111  PAGE_COPY
 142
 143 #define __S000  PAGE_NONE
 144 #define __S001  PAGE_READONLY
 145 #define __S010  PAGE_SHARED
 146 #define __S011  PAGE_SHARED
 147 #define __S100  PAGE_READONLY
 148 #define __S101  PAGE_READONLY
 149 #define __S110  PAGE_SHARED
 150 #define __S111  PAGE_SHARED
 151
 152 #define pgprot_noncached pgprot_noncached
 153
 154 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 155 {
 156         unsigned long prot = pgprot_val(_prot);
 157
 158         prot = (prot & ~_CACHE_MASK);
 159
 160         return __pgprot(prot);
 161 }
 162
 163 #define __swp_type(x)           ((x).val & 0x1f)
 164 #define __swp_offset(x)         ((x).val >> 10)
 165 #define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})
 166
 167 extern unsigned long empty_zero_page;
 168 extern unsigned long zero_page_mask;
 169
 170 #define ZERO_PAGE(vaddr) \
 171         (virt_to_page((void *)(empty_zero_page + \
 172          (((unsigned long)(vaddr)) & zero_page_mask))))
 173
 174 #define pgtable_cache_init()    do {} while (0)
 175
 176 #define arch_enter_lazy_cpu_mode()      do {} while (0)
 177
 178 static inline int pte_write(pte_t pte)
 179 {
 180         return pte_val(pte) & _PAGE_WRITE;
 181 }
 182
 183 static inline int pte_dirty(pte_t pte)
 184 {
 185         return pte_val(pte) & _PAGE_MODIFIED;
 186 }
 187
 188 static inline int pte_young(pte_t pte)
 189 {
 190         return pte_val(pte) & _PAGE_ACCESSED;
 191 }
 192
 193 #define pte_special(pte)        (0)
 194
 195 static inline pte_t pte_wrprotect(pte_t pte)
 196 {
 197         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
 198         return pte;
 199 }
 200
 201 static inline pte_t pte_mkclean(pte_t pte)
 202 {
 203         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
 204         return pte;
 205 }
 206
 207 static inline pte_t pte_mkold(pte_t pte)
 208 {
 209         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
 210         return pte;
 211 }
 212
 213 static inline pte_t pte_mkwrite(pte_t pte)
 214 {
 215         pte_val(pte) |= _PAGE_WRITE;
 216         if (pte_val(pte) & _PAGE_MODIFIED)
 217                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 218         return pte;
 219 }
 220
 221 static inline pte_t pte_mkdirty(pte_t pte)
 222 {
 223         pte_val(pte) |= _PAGE_MODIFIED;
 224         if (pte_val(pte) & _PAGE_WRITE)
 225                 pte_val(pte) |= _PAGE_SILENT_WRITE;
 226         return pte;
 227 }
 228
 229 static inline pte_t pte_mkyoung(pte_t pte)
 230 {
 231         pte_val(pte) |= _PAGE_ACCESSED;
 232         if (pte_val(pte) & _PAGE_READ)
 233                 pte_val(pte) |= _PAGE_SILENT_READ;
 234         return pte;
 235 }
 236
 237 #define set_pmd(pmdptr, pmdval)         \
 238          do { *(pmdptr) = (pmdval); } while (0)
 239 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
 240
 241 extern unsigned long pgd_current;
 242 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 243 extern void paging_init(void);
 244
 245 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 246 {
 247         return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
 248 }
 249
 250 extern void __update_tlb(struct vm_area_struct *vma,
 251         unsigned long address,  pte_t pte);
 252 extern void __update_cache(struct vm_area_struct *vma,
 253         unsigned long address,  pte_t pte);
 254
 255 static inline void update_mmu_cache(struct vm_area_struct *vma,
 256         unsigned long address, pte_t *ptep)
 257 {
 258         pte_t pte = *ptep;
 259         __update_tlb(vma, address, pte);
 260         __update_cache(vma, address, pte);
 261 }
 262
 263 #ifndef __ASSEMBLY__
 264 #include <asm-generic/pgtable.h>
 265
 266 void setup_memory(void);
 267 #endif /* __ASSEMBLY__ */
 268
 269 #endif /* _ASM_SCORE_PGTABLE_H */