arch/sparc/include/asm/pgtable_32.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _SPARC_PGTABLE_H
   3 #define _SPARC_PGTABLE_H
   4
   5 /*  asm/pgtable.h:  Defines and functions used to work
   6  *                        with Sparc page tables.
   7  *
   8  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   9  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  10  */
  11
  12 #include <linux/const.h>
  13
  14 #ifndef __ASSEMBLY__
  15 #include <asm-generic/pgtable-nopud.h>
  16
  17 #include <linux/spinlock.h>
  18 #include <linux/mm_types.h>
  19 #include <asm/types.h>
  20 #include <asm/pgtsrmmu.h>
  21 #include <asm/vaddrs.h>
  22 #include <asm/oplib.h>
  23 #include <asm/cpu_type.h>
  24
  25
  26 struct vm_area_struct;
  27 struct page;
  28
  29 void load_mmu(void);
  30 unsigned long calc_highpages(void);
  31 unsigned long __init bootmem_init(unsigned long *pages_avail);
  32
  33 #define pte_ERROR(e)   __builtin_trap()
  34 #define pmd_ERROR(e)   __builtin_trap()
  35 #define pgd_ERROR(e)   __builtin_trap()
  36
  37 #define PMD_SHIFT               22
  38 #define PMD_SIZE                (1UL << PMD_SHIFT)
  39 #define PMD_MASK                (~(PMD_SIZE-1))
  40 #define PMD_ALIGN(__addr)       (((__addr) + ~PMD_MASK) & PMD_MASK)
  41 #define PGDIR_SHIFT             SRMMU_PGDIR_SHIFT
  42 #define PGDIR_SIZE              SRMMU_PGDIR_SIZE
  43 #define PGDIR_MASK              SRMMU_PGDIR_MASK
  44 #define PTRS_PER_PTE            1024
  45 #define PTRS_PER_PMD            SRMMU_PTRS_PER_PMD
  46 #define PTRS_PER_PGD            SRMMU_PTRS_PER_PGD
  47 #define USER_PTRS_PER_PGD       PAGE_OFFSET / SRMMU_PGDIR_SIZE
  48 #define FIRST_USER_ADDRESS      0UL
  49 #define PTE_SIZE                (PTRS_PER_PTE*4)
  50
  51 #define PAGE_NONE       SRMMU_PAGE_NONE
  52 #define PAGE_SHARED     SRMMU_PAGE_SHARED
  53 #define PAGE_COPY       SRMMU_PAGE_COPY
  54 #define PAGE_READONLY   SRMMU_PAGE_RDONLY
  55 #define PAGE_KERNEL     SRMMU_PAGE_KERNEL
  56
  57 /* Top-level page directory - dummy used by init-mm.
  58  * srmmu.c will assign the real one (which is dynamically sized) */
  59 #define swapper_pg_dir NULL
  60
  61 void paging_init(void);
  62
  63 extern unsigned long ptr_in_current_pgd;
  64
  65 /*         xwr */
  66 #define __P000  PAGE_NONE
  67 #define __P001  PAGE_READONLY
  68 #define __P010  PAGE_COPY
  69 #define __P011  PAGE_COPY
  70 #define __P100  PAGE_READONLY
  71 #define __P101  PAGE_READONLY
  72 #define __P110  PAGE_COPY
  73 #define __P111  PAGE_COPY
  74
  75 #define __S000  PAGE_NONE
  76 #define __S001  PAGE_READONLY
  77 #define __S010  PAGE_SHARED
  78 #define __S011  PAGE_SHARED
  79 #define __S100  PAGE_READONLY
  80 #define __S101  PAGE_READONLY
  81 #define __S110  PAGE_SHARED
  82 #define __S111  PAGE_SHARED
  83
  84 /* First physical page can be anywhere, the following is needed so that
  85  * va-->pa and vice versa conversions work properly without performance
  86  * hit for all __pa()/__va() operations.
  87  */
  88 extern unsigned long phys_base;
  89 extern unsigned long pfn_base;
  90
  91 /*
  92  * ZERO_PAGE is a global shared page that is always zero: used
  93  * for zero-mapped memory areas etc..
  94  */
  95 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
  96
  97 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
  98
  99 /*
 100  * In general all page table modifications should use the V8 atomic
 101  * swap instruction.  This insures the mmu and the cpu are in sync
 102  * with respect to ref/mod bits in the page tables.
 103  */
 104 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
 105 {
 106         __asm__ __volatile__("swap [%2], %0" :
 107                         "=&r" (value) : "0" (value), "r" (addr) : "memory");
 108         return value;
 109 }
 110
 111 /* Certain architectures need to do special things when pte's
 112  * within a page table are directly modified.  Thus, the following
 113  * hook is made available.
 114  */
 115
 116 static inline void set_pte(pte_t *ptep, pte_t pteval)
 117 {
 118         srmmu_swap((unsigned long *)ptep, pte_val(pteval));
 119 }
 120
 121 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 122
 123 static inline int srmmu_device_memory(unsigned long x)
 124 {
 125         return ((x & 0xF0000000) != 0);
 126 }
 127
 128 static inline struct page *pmd_page(pmd_t pmd)
 129 {
 130         if (srmmu_device_memory(pmd_val(pmd)))
 131                 BUG();
 132         return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
 133 }
 134
 135 static inline unsigned long pud_page_vaddr(pud_t pud)
 136 {
 137         if (srmmu_device_memory(pud_val(pud))) {
 138                 return ~0;
 139         } else {
 140                 unsigned long v = pud_val(pud) & SRMMU_PTD_PMASK;
 141                 return (unsigned long)__nocache_va(v << 4);
 142         }
 143 }
 144
 145 static inline int pte_present(pte_t pte)
 146 {
 147         return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE);
 148 }
 149
 150 static inline int pte_none(pte_t pte)
 151 {
 152         return !pte_val(pte);
 153 }
 154
 155 static inline void __pte_clear(pte_t *ptep)
 156 {
 157         set_pte(ptep, __pte(0));
 158 }
 159
 160 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 161 {
 162         __pte_clear(ptep);
 163 }
 164
 165 static inline int pmd_bad(pmd_t pmd)
 166 {
 167         return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
 168 }
 169
 170 static inline int pmd_present(pmd_t pmd)
 171 {
 172         return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
 173 }
 174
 175 static inline int pmd_none(pmd_t pmd)
 176 {
 177         return !pmd_val(pmd);
 178 }
 179
 180 static inline void pmd_clear(pmd_t *pmdp)
 181 {
 182         int i;
 183         for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++)
 184                 set_pte((pte_t *)&pmdp->pmdv[i], __pte(0));
 185 }
 186
 187 static inline int pud_none(pud_t pud)
 188 {
 189         return !(pud_val(pud) & 0xFFFFFFF);
 190 }
 191
 192 static inline int pud_bad(pud_t pud)
 193 {
 194         return (pud_val(pud) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
 195 }
 196
 197 static inline int pud_present(pud_t pud)
 198 {
 199         return ((pud_val(pud) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
 200 }
 201
 202 static inline void pud_clear(pud_t *pudp)
 203 {
 204         set_pte((pte_t *)pudp, __pte(0));
 205 }
 206
 207 /*
 208  * The following only work if pte_present() is true.
 209  * Undefined behaviour if not..
 210  */
 211 static inline int pte_write(pte_t pte)
 212 {
 213         return pte_val(pte) & SRMMU_WRITE;
 214 }
 215
 216 static inline int pte_dirty(pte_t pte)
 217 {
 218         return pte_val(pte) & SRMMU_DIRTY;
 219 }
 220
 221 static inline int pte_young(pte_t pte)
 222 {
 223         return pte_val(pte) & SRMMU_REF;
 224 }
 225
 226 static inline int pte_special(pte_t pte)
 227 {
 228         return 0;
 229 }
 230
 231 static inline pte_t pte_wrprotect(pte_t pte)
 232 {
 233         return __pte(pte_val(pte) & ~SRMMU_WRITE);
 234 }
 235
 236 static inline pte_t pte_mkclean(pte_t pte)
 237 {
 238         return __pte(pte_val(pte) & ~SRMMU_DIRTY);
 239 }
 240
 241 static inline pte_t pte_mkold(pte_t pte)
 242 {
 243         return __pte(pte_val(pte) & ~SRMMU_REF);
 244 }
 245
 246 static inline pte_t pte_mkwrite(pte_t pte)
 247 {
 248         return __pte(pte_val(pte) | SRMMU_WRITE);
 249 }
 250
 251 static inline pte_t pte_mkdirty(pte_t pte)
 252 {
 253         return __pte(pte_val(pte) | SRMMU_DIRTY);
 254 }
 255
 256 static inline pte_t pte_mkyoung(pte_t pte)
 257 {
 258         return __pte(pte_val(pte) | SRMMU_REF);
 259 }
 260
 261 #define pte_mkspecial(pte)    (pte)
 262
 263 #define pfn_pte(pfn, prot)              mk_pte(pfn_to_page(pfn), prot)
 264
 265 static inline unsigned long pte_pfn(pte_t pte)
 266 {
 267         if (srmmu_device_memory(pte_val(pte))) {
 268                 /* Just return something that will cause
 269                  * pfn_valid() to return false.  This makes
 270                  * copy_one_pte() to just directly copy to
 271                  * PTE over.
 272                  */
 273                 return ~0UL;
 274         }
 275         return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
 276 }
 277
 278 #define pte_page(pte)   pfn_to_page(pte_pfn(pte))
 279
 280 /*
 281  * Conversion functions: convert a page and protection to a page entry,
 282  * and a page entry and page directory to the page they refer to.
 283  */
 284 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot)
 285 {
 286         return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot));
 287 }
 288
 289 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot)
 290 {
 291         return __pte(((page) >> 4) | pgprot_val(pgprot));
 292 }
 293
 294 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
 295 {
 296         return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot));
 297 }
 298
 299 #define pgprot_noncached pgprot_noncached
 300 static inline pgprot_t pgprot_noncached(pgprot_t prot)
 301 {
 302         pgprot_val(prot) &= ~pgprot_val(__pgprot(SRMMU_CACHE));
 303         return prot;
 304 }
 305
 306 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
 307 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 308 {
 309         return __pte((pte_val(pte) & SRMMU_CHG_MASK) |
 310                 pgprot_val(newprot));
 311 }
 312
 313 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
 314
 315 /* to find an entry in a page-table-directory */
 316 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
 317
 318 /* to find an entry in a kernel page-table-directory */
 319 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
 320
 321 /* Find an entry in the second-level page table.. */
 322 static inline pmd_t *pmd_offset(pud_t * dir, unsigned long address)
 323 {
 324         return (pmd_t *) pud_page_vaddr(*dir) +
 325                 ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1));
 326 }
 327
 328 /* Find an entry in the third-level page table.. */
 329 pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address);
 330
 331 /*
 332  * This shortcut works on sun4m (and sun4d) because the nocache area is static.
 333  */
 334 #define pte_offset_map(d, a)            pte_offset_kernel(d,a)
 335 #define pte_unmap(pte)          do{}while(0)
 336
 337 struct seq_file;
 338 void mmu_info(struct seq_file *m);
 339
 340 /* Fault handler stuff... */
 341 #define FAULT_CODE_PROT     0x1
 342 #define FAULT_CODE_WRITE    0x2
 343 #define FAULT_CODE_USER     0x4
 344
 345 #define update_mmu_cache(vma, address, ptep) do { } while (0)
 346
 347 void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
 348                       unsigned long xva, unsigned int len);
 349 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len);
 350
 351 /* Encode and de-code a swap entry */
 352 static inline unsigned long __swp_type(swp_entry_t entry)
 353 {
 354         return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK;
 355 }
 356
 357 static inline unsigned long __swp_offset(swp_entry_t entry)
 358 {
 359         return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK;
 360 }
 361
 362 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset)
 363 {
 364         return (swp_entry_t) {
 365                 (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT
 366                 | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT };
 367 }
 368
 369 #define __pte_to_swp_entry(pte)         ((swp_entry_t) { pte_val(pte) })
 370 #define __swp_entry_to_pte(x)           ((pte_t) { (x).val })
 371
 372 static inline unsigned long
 373 __get_phys (unsigned long addr)
 374 {
 375         switch (sparc_cpu_model){
 376         case sun4m:
 377         case sun4d:
 378                 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
 379         default:
 380                 return 0;
 381         }
 382 }
 383
 384 static inline int
 385 __get_iospace (unsigned long addr)
 386 {
 387         switch (sparc_cpu_model){
 388         case sun4m:
 389         case sun4d:
 390                 return (srmmu_get_pte (addr) >> 28);
 391         default:
 392                 return -1;
 393         }
 394 }
 395
 396 extern unsigned long *sparc_valid_addr_bitmap;
 397
 398 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
 399 #define kern_addr_valid(addr) \
 400         (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
 401
 402 /*
 403  * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
 404  * its high 4 bits.  These macros/functions put it there or get it from there.
 405  */
 406 #define MK_IOSPACE_PFN(space, pfn)      (pfn | (space << (BITS_PER_LONG - 4)))
 407 #define GET_IOSPACE(pfn)                (pfn >> (BITS_PER_LONG - 4))
 408 #define GET_PFN(pfn)                    (pfn & 0x0fffffffUL)
 409
 410 int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
 411                     unsigned long, pgprot_t);
 412
 413 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
 414                                      unsigned long from, unsigned long pfn,
 415                                      unsigned long size, pgprot_t prot)
 416 {
 417         unsigned long long offset, space, phys_base;
 418
 419         offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
 420         space = GET_IOSPACE(pfn);
 421         phys_base = offset | (space << 32ULL);
 422
 423         return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
 424 }
 425 #define io_remap_pfn_range io_remap_pfn_range
 426
 427 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
 428 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
 429 ({                                                                        \
 430         int __changed = !pte_same(*(__ptep), __entry);                    \
 431         if (__changed) {                                                  \
 432                 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
 433                 flush_tlb_page(__vma, __address);                         \
 434         }                                                                 \
 435         __changed;                                                        \
 436 })
 437
 438 #include <asm-generic/pgtable.h>
 439
 440 #endif /* !(__ASSEMBLY__) */
 441
 442 #define VMALLOC_START           _AC(0xfe600000,UL)
 443 #define VMALLOC_END             _AC(0xffc00000,UL)
 444
 445 /* We provide our own get_unmapped_area to cope with VA holes for userland */
 446 #define HAVE_ARCH_UNMAPPED_AREA
 447
 448 #endif /* !(_SPARC_PGTABLE_H) */