arch/m68k/include/asm/mcf_pgtable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _MCF_PGTABLE_H
   3 #define _MCF_PGTABLE_H
   4
   5 #include <asm/mcfmmu.h>
   6 #include <asm/page.h>
   7
   8 /*
   9  * MMUDR bits, in proper place. We write these directly into the MMUDR
  10  * after masking from the pte.
  11  */
  12 #define CF_PAGE_LOCKED          MMUDR_LK        /* 0x00000002 */
  13 #define CF_PAGE_EXEC            MMUDR_X         /* 0x00000004 */
  14 #define CF_PAGE_WRITABLE        MMUDR_W         /* 0x00000008 */
  15 #define CF_PAGE_READABLE        MMUDR_R         /* 0x00000010 */
  16 #define CF_PAGE_SYSTEM          MMUDR_SP        /* 0x00000020 */
  17 #define CF_PAGE_COPYBACK        MMUDR_CM_CCB    /* 0x00000040 */
  18 #define CF_PAGE_NOCACHE         MMUDR_CM_NCP    /* 0x00000080 */
  19
  20 #define CF_CACHEMASK            (~MMUDR_CM_CCB)
  21 #define CF_PAGE_MMUDR_MASK      0x000000fe
  22
  23 #define _PAGE_NOCACHE030        CF_PAGE_NOCACHE
  24
  25 /*
  26  * MMUTR bits, need shifting down.
  27  */
  28 #define CF_PAGE_MMUTR_MASK      0x00000c00
  29 #define CF_PAGE_MMUTR_SHIFT     10
  30
  31 #define CF_PAGE_VALID           (MMUTR_V << CF_PAGE_MMUTR_SHIFT)
  32 #define CF_PAGE_SHARED          (MMUTR_SG << CF_PAGE_MMUTR_SHIFT)
  33
  34 /*
  35  * Fake bits, not implemented in CF, will get masked out before
  36  * hitting hardware.
  37  */
  38 #define CF_PAGE_DIRTY           0x00000001
  39 #define CF_PAGE_ACCESSED        0x00001000
  40
  41 #define _PAGE_CACHE040          0x020   /* 68040 cache mode, cachable, copyback */
  42 #define _PAGE_NOCACHE_S         0x040   /* 68040 no-cache mode, serialized */
  43 #define _PAGE_NOCACHE           0x060   /* 68040 cache mode, non-serialized */
  44 #define _PAGE_CACHE040W         0x000   /* 68040 cache mode, cachable, write-through */
  45 #define _DESCTYPE_MASK          0x003
  46 #define _CACHEMASK040           (~0x060)
  47 #define _PAGE_GLOBAL040         0x400   /* 68040 global bit, used for kva descs */
  48
  49 /*
  50  * Externally used page protection values.
  51  */
  52 #define _PAGE_PRESENT   (CF_PAGE_VALID)
  53 #define _PAGE_ACCESSED  (CF_PAGE_ACCESSED)
  54 #define _PAGE_DIRTY     (CF_PAGE_DIRTY)
  55 #define _PAGE_READWRITE (CF_PAGE_READABLE \
  56                                 | CF_PAGE_WRITABLE \
  57                                 | CF_PAGE_SYSTEM \
  58                                 | CF_PAGE_SHARED)
  59
  60 /*
  61  * Compound page protection values.
  62  */
  63 #define PAGE_NONE       __pgprot(CF_PAGE_VALID \
  64                                  | CF_PAGE_ACCESSED)
  65
  66 #define PAGE_SHARED     __pgprot(CF_PAGE_VALID \
  67                                  | CF_PAGE_ACCESSED \
  68                                  | CF_PAGE_SHARED)
  69
  70 #define PAGE_INIT       __pgprot(CF_PAGE_VALID \
  71                                  | CF_PAGE_READABLE \
  72                                  | CF_PAGE_WRITABLE \
  73                                  | CF_PAGE_EXEC \
  74                                  | CF_PAGE_SYSTEM)
  75
  76 #define PAGE_KERNEL     __pgprot(CF_PAGE_VALID \
  77                                  | CF_PAGE_ACCESSED \
  78                                  | CF_PAGE_READABLE \
  79                                  | CF_PAGE_WRITABLE \
  80                                  | CF_PAGE_EXEC \
  81                                  | CF_PAGE_SYSTEM \
  82                                  | CF_PAGE_SHARED)
  83
  84 #define PAGE_COPY       __pgprot(CF_PAGE_VALID \
  85                                  | CF_PAGE_ACCESSED \
  86                                  | CF_PAGE_READABLE \
  87                                  | CF_PAGE_DIRTY)
  88
  89 /*
  90  * Page protections for initialising protection_map. See mm/mmap.c
  91  * for use. In general, the bit positions are xwr, and P-items are
  92  * private, the S-items are shared.
  93  */
  94 #define __P000          PAGE_NONE
  95 #define __P001          __pgprot(CF_PAGE_VALID \
  96                                  | CF_PAGE_ACCESSED \
  97                                  | CF_PAGE_READABLE)
  98 #define __P010          __pgprot(CF_PAGE_VALID \
  99                                  | CF_PAGE_ACCESSED \
 100                                  | CF_PAGE_WRITABLE)
 101 #define __P011          __pgprot(CF_PAGE_VALID \
 102                                  | CF_PAGE_ACCESSED \
 103                                  | CF_PAGE_READABLE \
 104                                  | CF_PAGE_WRITABLE)
 105 #define __P100          __pgprot(CF_PAGE_VALID \
 106                                  | CF_PAGE_ACCESSED \
 107                                  | CF_PAGE_EXEC)
 108 #define __P101          __pgprot(CF_PAGE_VALID \
 109                                  | CF_PAGE_ACCESSED \
 110                                  | CF_PAGE_READABLE \
 111                                  | CF_PAGE_EXEC)
 112 #define __P110          __pgprot(CF_PAGE_VALID \
 113                                  | CF_PAGE_ACCESSED \
 114                                  | CF_PAGE_WRITABLE \
 115                                  | CF_PAGE_EXEC)
 116 #define __P111          __pgprot(CF_PAGE_VALID \
 117                                  | CF_PAGE_ACCESSED \
 118                                  | CF_PAGE_READABLE \
 119                                  | CF_PAGE_WRITABLE \
 120                                  | CF_PAGE_EXEC)
 121
 122 #define __S000          PAGE_NONE
 123 #define __S001          __pgprot(CF_PAGE_VALID \
 124                                  | CF_PAGE_ACCESSED \
 125                                  | CF_PAGE_READABLE)
 126 #define __S010          PAGE_SHARED
 127 #define __S011          __pgprot(CF_PAGE_VALID \
 128                                  | CF_PAGE_ACCESSED \
 129                                  | CF_PAGE_SHARED \
 130                                  | CF_PAGE_READABLE)
 131 #define __S100          __pgprot(CF_PAGE_VALID \
 132                                  | CF_PAGE_ACCESSED \
 133                                  | CF_PAGE_EXEC)
 134 #define __S101          __pgprot(CF_PAGE_VALID \
 135                                  | CF_PAGE_ACCESSED \
 136                                  | CF_PAGE_READABLE \
 137                                  | CF_PAGE_EXEC)
 138 #define __S110          __pgprot(CF_PAGE_VALID \
 139                                  | CF_PAGE_ACCESSED \
 140                                  | CF_PAGE_SHARED \
 141                                  | CF_PAGE_EXEC)
 142 #define __S111          __pgprot(CF_PAGE_VALID \
 143                                  | CF_PAGE_ACCESSED \
 144                                  | CF_PAGE_SHARED \
 145                                  | CF_PAGE_READABLE \
 146                                  | CF_PAGE_EXEC)
 147
 148 #define PTE_MASK        PAGE_MASK
 149 #define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)
 150
 151 #ifndef __ASSEMBLY__
 152
 153 /*
 154  * Conversion functions: convert a page and protection to a page entry,
 155  * and a page entry and page directory to the page they refer to.
 156  */
 157 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
 158
 159 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 160 {
 161         pte_val(pte) = (pte_val(pte) & CF_PAGE_CHG_MASK) | pgprot_val(newprot);
 162         return pte;
 163 }
 164
 165 #define pmd_set(pmdp, ptep) do {} while (0)
 166
 167 static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
 168 {
 169         pgd_val(*pgdp) = virt_to_phys(pmdp);
 170 }
 171
 172 #define __pte_page(pte) ((unsigned long) (pte_val(pte) & PAGE_MASK))
 173 #define __pmd_page(pmd) ((unsigned long) (pmd_val(pmd)))
 174
 175 static inline int pte_none(pte_t pte)
 176 {
 177         return !pte_val(pte);
 178 }
 179
 180 static inline int pte_present(pte_t pte)
 181 {
 182         return pte_val(pte) & CF_PAGE_VALID;
 183 }
 184
 185 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
 186         pte_t *ptep)
 187 {
 188         pte_val(*ptep) = 0;
 189 }
 190
 191 #define pte_pagenr(pte) ((__pte_page(pte) - PAGE_OFFSET) >> PAGE_SHIFT)
 192 #define pte_page(pte)   virt_to_page(__pte_page(pte))
 193
 194 static inline int pmd_none2(pmd_t *pmd) { return !pmd_val(*pmd); }
 195 #define pmd_none(pmd) pmd_none2(&(pmd))
 196 static inline int pmd_bad2(pmd_t *pmd) { return 0; }
 197 #define pmd_bad(pmd) pmd_bad2(&(pmd))
 198 #define pmd_present(pmd) (!pmd_none2(&(pmd)))
 199 static inline void pmd_clear(pmd_t *pmdp) { pmd_val(*pmdp) = 0; }
 200
 201 #define pte_ERROR(e) \
 202         printk(KERN_ERR "%s:%d: bad pte %08lx.\n",      \
 203         __FILE__, __LINE__, pte_val(e))
 204 #define pgd_ERROR(e) \
 205         printk(KERN_ERR "%s:%d: bad pgd %08lx.\n",      \
 206         __FILE__, __LINE__, pgd_val(e))
 207
 208 /*
 209  * The following only work if pte_present() is true.
 210  * Undefined behaviour if not...
 211  * [we have the full set here even if they don't change from m68k]
 212  */
 213 static inline int pte_read(pte_t pte)
 214 {
 215         return pte_val(pte) & CF_PAGE_READABLE;
 216 }
 217
 218 static inline int pte_write(pte_t pte)
 219 {
 220         return pte_val(pte) & CF_PAGE_WRITABLE;
 221 }
 222
 223 static inline int pte_exec(pte_t pte)
 224 {
 225         return pte_val(pte) & CF_PAGE_EXEC;
 226 }
 227
 228 static inline int pte_dirty(pte_t pte)
 229 {
 230         return pte_val(pte) & CF_PAGE_DIRTY;
 231 }
 232
 233 static inline int pte_young(pte_t pte)
 234 {
 235         return pte_val(pte) & CF_PAGE_ACCESSED;
 236 }
 237
 238 static inline int pte_special(pte_t pte)
 239 {
 240         return 0;
 241 }
 242
 243 static inline pte_t pte_wrprotect(pte_t pte)
 244 {
 245         pte_val(pte) &= ~CF_PAGE_WRITABLE;
 246         return pte;
 247 }
 248
 249 static inline pte_t pte_rdprotect(pte_t pte)
 250 {
 251         pte_val(pte) &= ~CF_PAGE_READABLE;
 252         return pte;
 253 }
 254
 255 static inline pte_t pte_exprotect(pte_t pte)
 256 {
 257         pte_val(pte) &= ~CF_PAGE_EXEC;
 258         return pte;
 259 }
 260
 261 static inline pte_t pte_mkclean(pte_t pte)
 262 {
 263         pte_val(pte) &= ~CF_PAGE_DIRTY;
 264         return pte;
 265 }
 266
 267 static inline pte_t pte_mkold(pte_t pte)
 268 {
 269         pte_val(pte) &= ~CF_PAGE_ACCESSED;
 270         return pte;
 271 }
 272
 273 static inline pte_t pte_mkwrite(pte_t pte)
 274 {
 275         pte_val(pte) |= CF_PAGE_WRITABLE;
 276         return pte;
 277 }
 278
 279 static inline pte_t pte_mkread(pte_t pte)
 280 {
 281         pte_val(pte) |= CF_PAGE_READABLE;
 282         return pte;
 283 }
 284
 285 static inline pte_t pte_mkexec(pte_t pte)
 286 {
 287         pte_val(pte) |= CF_PAGE_EXEC;
 288         return pte;
 289 }
 290
 291 static inline pte_t pte_mkdirty(pte_t pte)
 292 {
 293         pte_val(pte) |= CF_PAGE_DIRTY;
 294         return pte;
 295 }
 296
 297 static inline pte_t pte_mkyoung(pte_t pte)
 298 {
 299         pte_val(pte) |= CF_PAGE_ACCESSED;
 300         return pte;
 301 }
 302
 303 static inline pte_t pte_mknocache(pte_t pte)
 304 {
 305         pte_val(pte) |= 0x80 | (pte_val(pte) & ~0x40);
 306         return pte;
 307 }
 308
 309 static inline pte_t pte_mkcache(pte_t pte)
 310 {
 311         pte_val(pte) &= ~CF_PAGE_NOCACHE;
 312         return pte;
 313 }
 314
 315 static inline pte_t pte_mkspecial(pte_t pte)
 316 {
 317         return pte;
 318 }
 319
 320 #define swapper_pg_dir kernel_pg_dir
 321 extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
 322
 323 /*
 324  * Find an entry in a pagetable directory.
 325  */
 326 #define pgd_index(address)      ((address) >> PGDIR_SHIFT)
 327 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 328
 329 /*
 330  * Find an entry in a kernel pagetable directory.
 331  */
 332 #define pgd_offset_k(address)   pgd_offset(&init_mm, address)
 333
 334 /*
 335  * Find an entry in the third-level pagetable.
 336  */
 337 #define __pte_offset(address)   ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
 338 #define pte_offset_kernel(dir, address) \
 339         ((pte_t *) __pmd_page(*(dir)) + __pte_offset(address))
 340
 341 /*
 342  * Disable caching for page at given kernel virtual address.
 343  */
 344 static inline void nocache_page(void *vaddr)
 345 {
 346         pgd_t *dir;
 347         p4d_t *p4dp;
 348         pud_t *pudp;
 349         pmd_t *pmdp;
 350         pte_t *ptep;
 351         unsigned long addr = (unsigned long) vaddr;
 352
 353         dir = pgd_offset_k(addr);
 354         p4dp = p4d_offset(dir, addr);
 355         pudp = pud_offset(p4dp, addr);
 356         pmdp = pmd_offset(pudp, addr);
 357         ptep = pte_offset_kernel(pmdp, addr);
 358         *ptep = pte_mknocache(*ptep);
 359 }
 360
 361 /*
 362  * Enable caching for page at given kernel virtual address.
 363  */
 364 static inline void cache_page(void *vaddr)
 365 {
 366         pgd_t *dir;
 367         p4d_t *p4dp;
 368         pud_t *pudp;
 369         pmd_t *pmdp;
 370         pte_t *ptep;
 371         unsigned long addr = (unsigned long) vaddr;
 372
 373         dir = pgd_offset_k(addr);
 374         p4dp = p4d_offset(dir, addr);
 375         pudp = pud_offset(p4dp, addr);
 376         pmdp = pmd_offset(pudp, addr);
 377         ptep = pte_offset_kernel(pmdp, addr);
 378         *ptep = pte_mkcache(*ptep);
 379 }
 380
 381 /*
 382  * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e))
 383  */
 384 #define __swp_type(x)           ((x).val & 0xFF)
 385 #define __swp_offset(x)         ((x).val >> 11)
 386 #define __swp_entry(typ, off)   ((swp_entry_t) { (typ) | \
 387                                         (off << 11) })
 388 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
 389 #define __swp_entry_to_pte(x)   (__pte((x).val))
 390
 391 #define pmd_page(pmd)           (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
 392
 393 #define pte_offset_map(pmdp, addr) ((pte_t *)__pmd_page(*pmdp) + \
 394                                        __pte_offset(addr))
 395 #define pte_unmap(pte)          ((void) 0)
 396 #define pfn_pte(pfn, prot)      __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
 397 #define pte_pfn(pte)            (pte_val(pte) >> PAGE_SHIFT)
 398
 399 #endif  /* !__ASSEMBLY__ */
 400 #endif  /* _MCF_PGTABLE_H */