arch/csky/include/asm/pgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef __ASM_CSKY_PGTABLE_H
   4 #define __ASM_CSKY_PGTABLE_H
   5
   6 #include <asm/fixmap.h>
   7 #include <asm/memory.h>
   8 #include <asm/addrspace.h>
   9 #include <abi/pgtable-bits.h>
  10 #include <asm-generic/pgtable-nopmd.h>
  11
  12 #define PGDIR_SHIFT             22
  13 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  14 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  15
  16 #define USER_PTRS_PER_PGD       (PAGE_OFFSET/PGDIR_SIZE)
  17
  18 /*
  19  * C-SKY is two-level paging structure:
  20  */
  21
  22 #define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
  23 #define PTRS_PER_PMD    1
  24 #define PTRS_PER_PTE    (PAGE_SIZE / sizeof(pte_t))
  25
  26 #define pte_ERROR(e) \
  27         pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
  28 #define pgd_ERROR(e) \
  29         pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  30
  31 #define PFN_PTE_SHIFT   PAGE_SHIFT
  32 #define pmd_pfn(pmd)    (pmd_phys(pmd) >> PAGE_SHIFT)
  33 #define pmd_page(pmd)   (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  34 #define pte_clear(mm, addr, ptep)       set_pte((ptep), \
  35         (((unsigned int) addr >= PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
  36 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  37 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  38 #define pte_pfn(x)      ((unsigned long)((x).pte_low >> PAGE_SHIFT))
  39 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
  40                                 | pgprot_val(prot))
  41
  42 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
  43 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  44
  45 #define pte_page(x)                     pfn_to_page(pte_pfn(x))
  46 #define __mk_pte(page_nr, pgprot)       __pte(((page_nr) << PAGE_SHIFT) | \
  47                                         pgprot_val(pgprot))
  48
  49 /*
  50  * C-SKY only has VALID and DIRTY bit in hardware. So we need to use the
  51  * two bits emulate PRESENT, READ, WRITE, EXEC, MODIFIED, ACCESSED.
  52  */
  53 #define _PAGE_BASE      (_PAGE_PRESENT | _PAGE_ACCESSED)
  54
  55 #define PAGE_NONE       __pgprot(_PAGE_PROT_NONE)
  56 #define PAGE_READ       __pgprot(_PAGE_BASE | _PAGE_READ | \
  57                                 _CACHE_CACHED)
  58 #define PAGE_WRITE      __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
  59                                 _CACHE_CACHED)
  60 #define PAGE_SHARED PAGE_WRITE
  61
  62 #define PAGE_KERNEL     __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
  63                                 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
  64                                 _PAGE_GLOBAL | \
  65                                 _CACHE_CACHED)
  66
  67 #define _PAGE_IOREMAP           (_PAGE_BASE | _PAGE_READ | _PAGE_VALID | \
  68                                 _PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED | \
  69                                 _PAGE_GLOBAL | \
  70                                 _CACHE_UNCACHED | _PAGE_SO)
  71
  72 #define _PAGE_CHG_MASK  (~(unsigned long) \
  73                                 (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  74                                 _CACHE_MASK | _PAGE_GLOBAL))
  75
  76 #define MAX_SWAPFILES_CHECK() \
  77                 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT != 5)
  78
  79 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  80 #define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
  81
  82 extern void load_pgd(unsigned long pg_dir);
  83 extern pte_t invalid_pte_table[PTRS_PER_PTE];
  84
  85 static inline void set_pte(pte_t *p, pte_t pte)
  86 {
  87         *p = pte;
  88 #if defined(CONFIG_CPU_NEED_TLBSYNC)
  89         dcache_wb_line((u32)p);
  90 #endif
  91         /* prevent out of order excution */
  92         smp_mb();
  93 }
  94
  95 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
  96 {
  97         unsigned long ptr;
  98
  99         ptr = pmd_val(pmd);
 100
 101         return __va(ptr);
 102 }
 103
 104 #define pmd_phys(pmd) pmd_val(pmd)
 105
 106 static inline void set_pmd(pmd_t *p, pmd_t pmd)
 107 {
 108         *p = pmd;
 109 #if defined(CONFIG_CPU_NEED_TLBSYNC)
 110         dcache_wb_line((u32)p);
 111 #endif
 112         /* prevent specul excute */
 113         smp_mb();
 114 }
 115
 116
 117 static inline int pmd_none(pmd_t pmd)
 118 {
 119         return pmd_val(pmd) == __pa(invalid_pte_table);
 120 }
 121
 122 #define pmd_bad(pmd)    (pmd_val(pmd) & ~PAGE_MASK)
 123
 124 static inline int pmd_present(pmd_t pmd)
 125 {
 126         return (pmd_val(pmd) != __pa(invalid_pte_table));
 127 }
 128
 129 static inline void pmd_clear(pmd_t *p)
 130 {
 131         pmd_val(*p) = (__pa(invalid_pte_table));
 132 #if defined(CONFIG_CPU_NEED_TLBSYNC)
 133         dcache_wb_line((u32)p);
 134 #endif
 135 }
 136
 137 /*
 138  * The following only work if pte_present() is true.
 139  * Undefined behaviour if not..
 140  */
 141 static inline int pte_read(pte_t pte)
 142 {
 143         return pte.pte_low & _PAGE_READ;
 144 }
 145
 146 static inline int pte_write(pte_t pte)
 147 {
 148         return (pte).pte_low & _PAGE_WRITE;
 149 }
 150
 151 static inline int pte_dirty(pte_t pte)
 152 {
 153         return (pte).pte_low & _PAGE_MODIFIED;
 154 }
 155
 156 static inline int pte_young(pte_t pte)
 157 {
 158         return (pte).pte_low & _PAGE_ACCESSED;
 159 }
 160
 161 static inline pte_t pte_wrprotect(pte_t pte)
 162 {
 163         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
 164         return pte;
 165 }
 166
 167 static inline pte_t pte_mkclean(pte_t pte)
 168 {
 169         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
 170         return pte;
 171 }
 172
 173 static inline pte_t pte_mkold(pte_t pte)
 174 {
 175         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
 176         return pte;
 177 }
 178
 179 static inline pte_t pte_mkwrite_novma(pte_t pte)
 180 {
 181         pte_val(pte) |= _PAGE_WRITE;
 182         if (pte_val(pte) & _PAGE_MODIFIED)
 183                 pte_val(pte) |= _PAGE_DIRTY;
 184         return pte;
 185 }
 186
 187 static inline pte_t pte_mkdirty(pte_t pte)
 188 {
 189         pte_val(pte) |= _PAGE_MODIFIED;
 190         if (pte_val(pte) & _PAGE_WRITE)
 191                 pte_val(pte) |= _PAGE_DIRTY;
 192         return pte;
 193 }
 194
 195 static inline pte_t pte_mkyoung(pte_t pte)
 196 {
 197         pte_val(pte) |= _PAGE_ACCESSED;
 198         if (pte_val(pte) & _PAGE_READ)
 199                 pte_val(pte) |= _PAGE_VALID;
 200         return pte;
 201 }
 202
 203 static inline int pte_swp_exclusive(pte_t pte)
 204 {
 205         return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
 206 }
 207
 208 static inline pte_t pte_swp_mkexclusive(pte_t pte)
 209 {
 210         pte_val(pte) |= _PAGE_SWP_EXCLUSIVE;
 211         return pte;
 212 }
 213
 214 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 215 {
 216         pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE;
 217         return pte;
 218 }
 219
 220 #define __HAVE_PHYS_MEM_ACCESS_PROT
 221 struct file;
 222 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 223                                      unsigned long size, pgprot_t vma_prot);
 224
 225 /*
 226  * Macro to make mark a page protection value as "uncacheable".  Note
 227  * that "protection" is really a misnomer here as the protection value
 228  * contains the memory attribute bits, dirty bits, and various other
 229  * bits as well.
 230  */
 231 #define pgprot_noncached pgprot_noncached
 232
 233 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 234 {
 235         unsigned long prot = pgprot_val(_prot);
 236
 237         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
 238
 239         return __pgprot(prot);
 240 }
 241
 242 #define pgprot_writecombine pgprot_writecombine
 243 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 244 {
 245         unsigned long prot = pgprot_val(_prot);
 246
 247         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 248
 249         return __pgprot(prot);
 250 }
 251
 252 /*
 253  * Conversion functions: convert a page and protection to a page entry,
 254  * and a page entry and page directory to the page they refer to.
 255  */
 256 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 257 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 258 {
 259         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 260                      (pgprot_val(newprot)));
 261 }
 262
 263 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 264 extern void paging_init(void);
 265
 266 void update_mmu_cache_range(struct vm_fault *vmf, struct vm_area_struct *vma,
 267                 unsigned long address, pte_t *pte, unsigned int nr);
 268 #define update_mmu_cache(vma, addr, ptep) \
 269         update_mmu_cache_range(NULL, vma, addr, ptep, 1)
 270
 271 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 272         remap_pfn_range(vma, vaddr, pfn, size, prot)
 273
 274 #endif /* __ASM_CSKY_PGTABLE_H */