arch/csky/include/asm/pgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4 #ifndef __ASM_CSKY_PGTABLE_H
   5 #define __ASM_CSKY_PGTABLE_H
   6
   7 #include <asm/fixmap.h>
   8 #include <asm/memory.h>
   9 #include <asm/addrspace.h>
  10 #include <abi/pgtable-bits.h>
  11 #include <asm-generic/pgtable-nopmd.h>
  12
  13 #define PGDIR_SHIFT             22
  14 #define PGDIR_SIZE              (1UL << PGDIR_SHIFT)
  15 #define PGDIR_MASK              (~(PGDIR_SIZE-1))
  16
  17 #define USER_PTRS_PER_PGD       (0x80000000UL/PGDIR_SIZE)
  18 #define FIRST_USER_ADDRESS      0UL
  19
  20 /*
  21  * C-SKY is two-level paging structure:
  22  */
  23 #define PGD_ORDER       0
  24 #define PTE_ORDER       0
  25
  26 #define PTRS_PER_PGD    ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t))
  27 #define PTRS_PER_PMD    1
  28 #define PTRS_PER_PTE    ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t))
  29
  30 #define pte_ERROR(e) \
  31         pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
  32 #define pgd_ERROR(e) \
  33         pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
  34
  35 #define pmd_page(pmd)   (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
  36 #define pte_clear(mm, addr, ptep)       set_pte((ptep), \
  37         (((unsigned int) addr & PAGE_OFFSET) ? __pte(_PAGE_GLOBAL) : __pte(0)))
  38 #define pte_none(pte)           (!(pte_val(pte) & ~_PAGE_GLOBAL))
  39 #define pte_present(pte)        (pte_val(pte) & _PAGE_PRESENT)
  40 #define pte_pfn(x)      ((unsigned long)((x).pte_low >> PAGE_SHIFT))
  41 #define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \
  42                                 | pgprot_val(prot))
  43
  44 #define __READABLE      (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED)
  45 #define __WRITEABLE     (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED)
  46
  47 #define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \
  48                          _CACHE_MASK)
  49
  50 #define __swp_type(x)                   (((x).val >> 4) & 0xff)
  51 #define __swp_offset(x)                 ((x).val >> 12)
  52 #define __swp_entry(type, offset)       ((swp_entry_t) {((type) << 4) | \
  53                                         ((offset) << 12) })
  54 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
  55 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
  56
  57 #define pte_page(x)                     pfn_to_page(pte_pfn(x))
  58 #define __mk_pte(page_nr, pgprot)       __pte(((page_nr) << PAGE_SHIFT) | \
  59                                         pgprot_val(pgprot))
  60
  61 /*
  62  * CSKY can't do page protection for execute, and considers that the same like
  63  * read. Also, write permissions imply read permissions. This is the closest
  64  * we can get by reasonable means..
  65  */
  66 #define PAGE_NONE       __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
  67 #define PAGE_SHARED     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  68                                 _CACHE_CACHED)
  69 #define PAGE_COPY       __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
  70 #define PAGE_READONLY   __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
  71 #define PAGE_KERNEL     __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
  72                                 _PAGE_GLOBAL | _CACHE_CACHED)
  73 #define PAGE_USERIO     __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
  74                                 _CACHE_CACHED)
  75
  76 #define _PAGE_IOREMAP \
  77         (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
  78          _CACHE_UNCACHED | _PAGE_SO)
  79
  80 #define __P000  PAGE_NONE
  81 #define __P001  PAGE_READONLY
  82 #define __P010  PAGE_COPY
  83 #define __P011  PAGE_COPY
  84 #define __P100  PAGE_READONLY
  85 #define __P101  PAGE_READONLY
  86 #define __P110  PAGE_COPY
  87 #define __P111  PAGE_COPY
  88
  89 #define __S000  PAGE_NONE
  90 #define __S001  PAGE_READONLY
  91 #define __S010  PAGE_SHARED
  92 #define __S011  PAGE_SHARED
  93 #define __S100  PAGE_READONLY
  94 #define __S101  PAGE_READONLY
  95 #define __S110  PAGE_SHARED
  96 #define __S111  PAGE_SHARED
  97
  98 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  99 #define ZERO_PAGE(vaddr)        (virt_to_page(empty_zero_page))
 100
 101 extern void load_pgd(unsigned long pg_dir);
 102 extern pte_t invalid_pte_table[PTRS_PER_PTE];
 103
 104 static inline void set_pte(pte_t *p, pte_t pte)
 105 {
 106         *p = pte;
 107 #if defined(CONFIG_CPU_NEED_TLBSYNC)
 108         dcache_wb_line((u32)p);
 109 #endif
 110         /* prevent out of order excution */
 111         smp_mb();
 112 }
 113 #define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 114
 115 static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 116 {
 117         unsigned long ptr;
 118
 119         ptr = pmd_val(pmd);
 120
 121         return __va(ptr);
 122 }
 123
 124 #define pmd_phys(pmd) pmd_val(pmd)
 125
 126 static inline void set_pmd(pmd_t *p, pmd_t pmd)
 127 {
 128         *p = pmd;
 129 #if defined(CONFIG_CPU_NEED_TLBSYNC)
 130         dcache_wb_line((u32)p);
 131 #endif
 132         /* prevent specul excute */
 133         smp_mb();
 134 }
 135
 136
 137 static inline int pmd_none(pmd_t pmd)
 138 {
 139         return pmd_val(pmd) == __pa(invalid_pte_table);
 140 }
 141
 142 #define pmd_bad(pmd)    (pmd_val(pmd) & ~PAGE_MASK)
 143
 144 static inline int pmd_present(pmd_t pmd)
 145 {
 146         return (pmd_val(pmd) != __pa(invalid_pte_table));
 147 }
 148
 149 static inline void pmd_clear(pmd_t *p)
 150 {
 151         pmd_val(*p) = (__pa(invalid_pte_table));
 152 #if defined(CONFIG_CPU_NEED_TLBSYNC)
 153         dcache_wb_line((u32)p);
 154 #endif
 155 }
 156
 157 /*
 158  * The following only work if pte_present() is true.
 159  * Undefined behaviour if not..
 160  */
 161 static inline int pte_read(pte_t pte)
 162 {
 163         return pte.pte_low & _PAGE_READ;
 164 }
 165
 166 static inline int pte_write(pte_t pte)
 167 {
 168         return (pte).pte_low & _PAGE_WRITE;
 169 }
 170
 171 static inline int pte_dirty(pte_t pte)
 172 {
 173         return (pte).pte_low & _PAGE_MODIFIED;
 174 }
 175
 176 static inline int pte_young(pte_t pte)
 177 {
 178         return (pte).pte_low & _PAGE_ACCESSED;
 179 }
 180
 181 static inline pte_t pte_wrprotect(pte_t pte)
 182 {
 183         pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY);
 184         return pte;
 185 }
 186
 187 static inline pte_t pte_mkclean(pte_t pte)
 188 {
 189         pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY);
 190         return pte;
 191 }
 192
 193 static inline pte_t pte_mkold(pte_t pte)
 194 {
 195         pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID);
 196         return pte;
 197 }
 198
 199 static inline pte_t pte_mkwrite(pte_t pte)
 200 {
 201         pte_val(pte) |= _PAGE_WRITE;
 202         if (pte_val(pte) & _PAGE_MODIFIED)
 203                 pte_val(pte) |= _PAGE_DIRTY;
 204         return pte;
 205 }
 206
 207 static inline pte_t pte_mkdirty(pte_t pte)
 208 {
 209         pte_val(pte) |= _PAGE_MODIFIED;
 210         if (pte_val(pte) & _PAGE_WRITE)
 211                 pte_val(pte) |= _PAGE_DIRTY;
 212         return pte;
 213 }
 214
 215 static inline pte_t pte_mkyoung(pte_t pte)
 216 {
 217         pte_val(pte) |= _PAGE_ACCESSED;
 218         if (pte_val(pte) & _PAGE_READ)
 219                 pte_val(pte) |= _PAGE_VALID;
 220         return pte;
 221 }
 222
 223 #define __HAVE_PHYS_MEM_ACCESS_PROT
 224 struct file;
 225 extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 226                                      unsigned long size, pgprot_t vma_prot);
 227
 228 /*
 229  * Macro to make mark a page protection value as "uncacheable".  Note
 230  * that "protection" is really a misnomer here as the protection value
 231  * contains the memory attribute bits, dirty bits, and various other
 232  * bits as well.
 233  */
 234 #define pgprot_noncached pgprot_noncached
 235
 236 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 237 {
 238         unsigned long prot = pgprot_val(_prot);
 239
 240         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED | _PAGE_SO;
 241
 242         return __pgprot(prot);
 243 }
 244
 245 #define pgprot_writecombine pgprot_writecombine
 246 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
 247 {
 248         unsigned long prot = pgprot_val(_prot);
 249
 250         prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
 251
 252         return __pgprot(prot);
 253 }
 254
 255 /*
 256  * Conversion functions: convert a page and protection to a page entry,
 257  * and a page entry and page directory to the page they refer to.
 258  */
 259 #define mk_pte(page, pgprot)    pfn_pte(page_to_pfn(page), (pgprot))
 260 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 261 {
 262         return __pte((pte_val(pte) & _PAGE_CHG_MASK) |
 263                      (pgprot_val(newprot)));
 264 }
 265
 266 extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
 267 extern void paging_init(void);
 268
 269 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
 270                       pte_t *pte);
 271
 272 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 273 #define kern_addr_valid(addr)   (1)
 274
 275 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
 276         remap_pfn_range(vma, vaddr, pfn, size, prot)
 277
 278 #endif /* __ASM_CSKY_PGTABLE_H */