1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _PARISC_PGTABLE_H 3 #define _PARISC_PGTABLE_H 4 5 #include <asm/page.h> 6 7 #if CONFIG_PGTABLE_LEVELS == 3 8 #include <asm-generic/pgtable-nopud.h> 9 #elif CONFIG_PGTABLE_LEVELS == 2 10 #include <asm-generic/pgtable-nopmd.h> 11 #endif 12 13 #include <asm/fixmap.h> 14 15 #ifndef __ASSEMBLY__ 16 /* 17 * we simulate an x86-style page table for the linux mm code 18 */ 19 20 #include <linux/bitops.h> 21 #include <linux/spinlock.h> 22 #include <linux/mm_types.h> 23 #include <asm/processor.h> 24 #include <asm/cache.h> 25 26 /* This is for the serialization of PxTLB broadcasts. At least on the N class 27 * systems, only one PxTLB inter processor broadcast can be active at any one 28 * time on the Merced bus. */ 29 extern spinlock_t pa_tlb_flush_lock; 30 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP) 31 extern int pa_serialize_tlb_flushes; 32 #else 33 #define pa_serialize_tlb_flushes (0) 34 #endif 35 36 #define purge_tlb_start(flags) do { \ 37 if (pa_serialize_tlb_flushes) \ 38 spin_lock_irqsave(&pa_tlb_flush_lock, flags); \ 39 else \ 40 local_irq_save(flags); \ 41 } while (0) 42 #define purge_tlb_end(flags) do { \ 43 if (pa_serialize_tlb_flushes) \ 44 spin_unlock_irqrestore(&pa_tlb_flush_lock, flags); \ 45 else \ 46 local_irq_restore(flags); \ 47 } while (0) 48 49 /* Purge data and instruction TLB entries. The TLB purge instructions 50 * are slow on SMP machines since the purge must be broadcast to all CPUs. 51 */ 52 53 static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr) 54 { 55 unsigned long flags; 56 57 purge_tlb_start(flags); 58 mtsp(mm->context.space_id, SR_TEMP1); 59 pdtlb(SR_TEMP1, addr); 60 pitlb(SR_TEMP1, addr); 61 purge_tlb_end(flags); 62 } 63 64 extern void __update_cache(pte_t pte); 65 66 /* Certain architectures need to do special things when PTEs 67 * within a page table are directly modified. Thus, the following 68 * hook is made available. 69 */ 70 #define set_pte(pteptr, pteval) \ 71 do { \ 72 *(pteptr) = (pteval); \ 73 mb(); \ 74 } while(0) 75 76 #endif /* !__ASSEMBLY__ */ 77 78 #define pte_ERROR(e) \ 79 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e)) 80 #if CONFIG_PGTABLE_LEVELS == 3 81 #define pmd_ERROR(e) \ 82 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, (unsigned long)pmd_val(e)) 83 #endif 84 #define pgd_ERROR(e) \ 85 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e)) 86 87 /* This is the size of the initially mapped kernel memory */ 88 #if defined(CONFIG_64BIT) 89 #define KERNEL_INITIAL_ORDER 26 /* 1<<26 = 64MB */ 90 #else 91 #define KERNEL_INITIAL_ORDER 25 /* 1<<25 = 32MB */ 92 #endif 93 #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER) 94 95 #if CONFIG_PGTABLE_LEVELS == 3 96 #define PMD_TABLE_ORDER 1 97 #define PGD_TABLE_ORDER 0 98 #else 99 #define PGD_TABLE_ORDER 1 100 #endif 101 102 /* Definitions for 3rd level (we use PLD here for Page Lower directory 103 * because PTE_SHIFT is used lower down to mean shift that has to be 104 * done to get usable bits out of the PTE) */ 105 #define PLD_SHIFT PAGE_SHIFT 106 #define PLD_SIZE PAGE_SIZE 107 #define BITS_PER_PTE (PAGE_SHIFT - BITS_PER_PTE_ENTRY) 108 #define PTRS_PER_PTE (1UL << BITS_PER_PTE) 109 110 /* Definitions for 2nd level */ 111 #if CONFIG_PGTABLE_LEVELS == 3 112 #define PMD_SHIFT (PLD_SHIFT + BITS_PER_PTE) 113 #define PMD_SIZE (1UL << PMD_SHIFT) 114 #define PMD_MASK (~(PMD_SIZE-1)) 115 #define BITS_PER_PMD (PAGE_SHIFT + PMD_TABLE_ORDER - BITS_PER_PMD_ENTRY) 116 #define PTRS_PER_PMD (1UL << BITS_PER_PMD) 117 #else 118 #define BITS_PER_PMD 0 119 #endif 120 121 /* Definitions for 1st level */ 122 #define PGDIR_SHIFT (PLD_SHIFT + BITS_PER_PTE + BITS_PER_PMD) 123 #if (PGDIR_SHIFT + PAGE_SHIFT + PGD_TABLE_ORDER - BITS_PER_PGD_ENTRY) > BITS_PER_LONG 124 #define BITS_PER_PGD (BITS_PER_LONG - PGDIR_SHIFT) 125 #else 126 #define BITS_PER_PGD (PAGE_SHIFT + PGD_TABLE_ORDER - BITS_PER_PGD_ENTRY) 127 #endif 128 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 129 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 130 #define PTRS_PER_PGD (1UL << BITS_PER_PGD) 131 #define USER_PTRS_PER_PGD PTRS_PER_PGD 132 133 #ifdef CONFIG_64BIT 134 #define MAX_ADDRBITS (PGDIR_SHIFT + BITS_PER_PGD) 135 #define MAX_ADDRESS (1UL << MAX_ADDRBITS) 136 #define SPACEID_SHIFT (MAX_ADDRBITS - 32) 137 #else 138 #define MAX_ADDRBITS (BITS_PER_LONG) 139 #define MAX_ADDRESS (1ULL << MAX_ADDRBITS) 140 #define SPACEID_SHIFT 0 141 #endif 142 143 /* This calculates the number of initial pages we need for the initial 144 * page tables */ 145 #if (KERNEL_INITIAL_ORDER) >= (PLD_SHIFT + BITS_PER_PTE) 146 # define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PLD_SHIFT - BITS_PER_PTE)) 147 #else 148 # define PT_INITIAL (1) /* all initial PTEs fit into one page */ 149 #endif 150 151 /* 152 * pgd entries used up by user/kernel: 153 */ 154 155 /* NB: The tlb miss handlers make certain assumptions about the order */ 156 /* of the following bits, so be careful (One example, bits 25-31 */ 157 /* are moved together in one instruction). */ 158 159 #define _PAGE_READ_BIT 31 /* (0x001) read access allowed */ 160 #define _PAGE_WRITE_BIT 30 /* (0x002) write access allowed */ 161 #define _PAGE_EXEC_BIT 29 /* (0x004) execute access allowed */ 162 #define _PAGE_GATEWAY_BIT 28 /* (0x008) privilege promotion allowed */ 163 #define _PAGE_DMB_BIT 27 /* (0x010) Data Memory Break enable (B bit) */ 164 #define _PAGE_DIRTY_BIT 26 /* (0x020) Page Dirty (D bit) */ 165 #define _PAGE_REFTRAP_BIT 25 /* (0x040) Page Ref. Trap enable (T bit) */ 166 #define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */ 167 #define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */ 168 #define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */ 169 #define _PAGE_HPAGE_BIT 21 /* (0x400) Software: Huge Page */ 170 #define _PAGE_USER_BIT 20 /* (0x800) Software: User accessible page */ 171 #ifdef CONFIG_HUGETLB_PAGE 172 #define _PAGE_SPECIAL_BIT _PAGE_DMB_BIT /* DMB feature is currently unused */ 173 #else 174 #define _PAGE_SPECIAL_BIT _PAGE_HPAGE_BIT /* use unused HUGE PAGE bit */ 175 #endif 176 177 /* N.B. The bits are defined in terms of a 32 bit word above, so the */ 178 /* following macro is ok for both 32 and 64 bit. */ 179 180 #define xlate_pabit(x) (31 - x) 181 182 /* this defines the shift to the usable bits in the PTE it is set so 183 * that the valid bits _PAGE_PRESENT_BIT and _PAGE_USER_BIT are set 184 * to zero */ 185 #define PTE_SHIFT xlate_pabit(_PAGE_USER_BIT) 186 187 /* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */ 188 #define PFN_PTE_SHIFT 12 189 190 #define _PAGE_READ (1 << xlate_pabit(_PAGE_READ_BIT)) 191 #define _PAGE_WRITE (1 << xlate_pabit(_PAGE_WRITE_BIT)) 192 #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE) 193 #define _PAGE_EXEC (1 << xlate_pabit(_PAGE_EXEC_BIT)) 194 #define _PAGE_GATEWAY (1 << xlate_pabit(_PAGE_GATEWAY_BIT)) 195 #define _PAGE_DMB (1 << xlate_pabit(_PAGE_DMB_BIT)) 196 #define _PAGE_DIRTY (1 << xlate_pabit(_PAGE_DIRTY_BIT)) 197 #define _PAGE_REFTRAP (1 << xlate_pabit(_PAGE_REFTRAP_BIT)) 198 #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT)) 199 #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT)) 200 #define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT)) 201 #define _PAGE_HUGE (1 << xlate_pabit(_PAGE_HPAGE_BIT)) 202 #define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT)) 203 #define _PAGE_SPECIAL (1 << xlate_pabit(_PAGE_SPECIAL_BIT)) 204 205 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED) 206 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_SPECIAL) 207 #define _PAGE_KERNEL_RO (_PAGE_PRESENT | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED) 208 #define _PAGE_KERNEL_EXEC (_PAGE_KERNEL_RO | _PAGE_EXEC) 209 #define _PAGE_KERNEL_RWX (_PAGE_KERNEL_EXEC | _PAGE_WRITE) 210 #define _PAGE_KERNEL (_PAGE_KERNEL_RO | _PAGE_WRITE) 211 212 /* We borrow bit 23 to store the exclusive marker in swap PTEs. */ 213 #define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED 214 215 /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds 216 * are page-aligned, we don't care about the PAGE_OFFSET bits, except 217 * for a few meta-information bits, so we shift the address to be 218 * able to effectively address 40/42/44-bits of physical address space 219 * depending on 4k/16k/64k PAGE_SIZE */ 220 #define _PxD_PRESENT_BIT 31 221 #define _PxD_VALID_BIT 30 222 223 #define PxD_FLAG_PRESENT (1 << xlate_pabit(_PxD_PRESENT_BIT)) 224 #define PxD_FLAG_VALID (1 << xlate_pabit(_PxD_VALID_BIT)) 225 #define PxD_FLAG_MASK (0xf) 226 #define PxD_FLAG_SHIFT (4) 227 #define PxD_VALUE_SHIFT (PFN_PTE_SHIFT-PxD_FLAG_SHIFT) 228 229 #ifndef __ASSEMBLY__ 230 231 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER) 232 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE) 233 /* Others seem to make this executable, I don't know if that's correct 234 or not. The stack is mapped this way though so this is necessary 235 in the short term - dhd@linuxcare.com, 2000-08-08 */ 236 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ) 237 #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE) 238 #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC) 239 #define PAGE_COPY PAGE_EXECREAD 240 #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC) 241 #define PAGE_KERNEL __pgprot(_PAGE_KERNEL) 242 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_KERNEL_EXEC) 243 #define PAGE_KERNEL_RWX __pgprot(_PAGE_KERNEL_RWX) 244 #define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL_RO) 245 #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE) 246 #define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_GATEWAY| _PAGE_READ) 247 248 249 /* 250 * We could have an execute only page using "gateway - promote to priv 251 * level 3", but that is kind of silly. So, the way things are defined 252 * now, we must always have read permission for pages with execute 253 * permission. For the fun of it we'll go ahead and support write only 254 * pages. 255 */ 256 257 /*xwr*/ 258 259 extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */ 260 261 /* initial page tables for 0-8MB for kernel */ 262 263 extern pte_t pg0[]; 264 265 /* zero page used for uninitialized stuff */ 266 267 extern unsigned long *empty_zero_page; 268 269 /* 270 * ZERO_PAGE is a global shared page that is always zero: used 271 * for zero-mapped memory areas etc.. 272 */ 273 274 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 275 276 #define pte_none(x) (pte_val(x) == 0) 277 #define pte_present(x) (pte_val(x) & _PAGE_PRESENT) 278 #define pte_user(x) (pte_val(x) & _PAGE_USER) 279 #define pte_clear(mm, addr, xp) set_pte(xp, __pte(0)) 280 281 #define pmd_flag(x) (pmd_val(x) & PxD_FLAG_MASK) 282 #define pmd_address(x) ((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 283 #define pud_flag(x) (pud_val(x) & PxD_FLAG_MASK) 284 #define pud_address(x) ((unsigned long)(pud_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 285 #define pgd_flag(x) (pgd_val(x) & PxD_FLAG_MASK) 286 #define pgd_address(x) ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT) 287 288 #define pmd_none(x) (!pmd_val(x)) 289 #define pmd_bad(x) (!(pmd_flag(x) & PxD_FLAG_VALID)) 290 #define pmd_present(x) (pmd_flag(x) & PxD_FLAG_PRESENT) 291 static inline void pmd_clear(pmd_t *pmd) { 292 set_pmd(pmd, __pmd(0)); 293 } 294 295 296 297 #if CONFIG_PGTABLE_LEVELS == 3 298 #define pud_pgtable(pud) ((pmd_t *) __va(pud_address(pud))) 299 #define pud_page(pud) virt_to_page((void *)pud_pgtable(pud)) 300 301 /* For 64 bit we have three level tables */ 302 303 #define pud_none(x) (!pud_val(x)) 304 #define pud_bad(x) (!(pud_flag(x) & PxD_FLAG_VALID)) 305 #define pud_present(x) (pud_flag(x) & PxD_FLAG_PRESENT) 306 static inline void pud_clear(pud_t *pud) { 307 set_pud(pud, __pud(0)); 308 } 309 #endif 310 311 /* 312 * The following only work if pte_present() is true. 313 * Undefined behaviour if not.. 314 */ 315 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; } 316 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; } 317 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; } 318 static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; } 319 320 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; } 321 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; } 322 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; } 323 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; } 324 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; } 325 static inline pte_t pte_mkwrite_novma(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; } 326 static inline pte_t pte_mkspecial(pte_t pte) { pte_val(pte) |= _PAGE_SPECIAL; return pte; } 327 328 /* 329 * Huge pte definitions. 330 */ 331 #ifdef CONFIG_HUGETLB_PAGE 332 #define pte_huge(pte) (pte_val(pte) & _PAGE_HUGE) 333 #define pte_mkhuge(pte) (__pte(pte_val(pte) | \ 334 (parisc_requires_coherency() ? 0 : _PAGE_HUGE))) 335 #else 336 #define pte_huge(pte) (0) 337 #define pte_mkhuge(pte) (pte) 338 #endif 339 340 341 /* 342 * Conversion functions: convert a page and protection to a page entry, 343 * and a page entry and page directory to the page they refer to. 344 */ 345 #define __mk_pte(addr,pgprot) \ 346 ({ \ 347 pte_t __pte; \ 348 \ 349 pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<<PFN_PTE_SHIFT) + pgprot_val(pgprot)); \ 350 \ 351 __pte; \ 352 }) 353 354 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) 355 356 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot) 357 { 358 pte_t pte; 359 pte_val(pte) = (pfn << PFN_PTE_SHIFT) | pgprot_val(pgprot); 360 return pte; 361 } 362 363 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 364 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; } 365 366 /* Permanent address of a page. On parisc we don't have highmem. */ 367 368 #define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT) 369 370 #define pte_page(pte) (pfn_to_page(pte_pfn(pte))) 371 372 static inline unsigned long pmd_page_vaddr(pmd_t pmd) 373 { 374 return ((unsigned long) __va(pmd_address(pmd))); 375 } 376 377 #define pmd_pfn(pmd) (pmd_address(pmd) >> PAGE_SHIFT) 378 #define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd))) 379 #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd)) 380 381 /* Find an entry in the second-level page table.. */ 382 383 extern void paging_init (void); 384 385 static inline void set_ptes(struct mm_struct *mm, unsigned long addr, 386 pte_t *ptep, pte_t pte, unsigned int nr) 387 { 388 if (pte_present(pte) && pte_user(pte)) 389 __update_cache(pte); 390 for (;;) { 391 *ptep = pte; 392 purge_tlb_entries(mm, addr); 393 if (--nr == 0) 394 break; 395 ptep++; 396 pte_val(pte) += 1 << PFN_PTE_SHIFT; 397 addr += PAGE_SIZE; 398 } 399 } 400 #define set_ptes set_ptes 401 402 /* Used for deferring calls to flush_dcache_page() */ 403 404 #define PG_dcache_dirty PG_arch_1 405 406 #define update_mmu_cache_range(vmf, vma, addr, ptep, nr) __update_cache(*ptep) 407 #define update_mmu_cache(vma, addr, ptep) __update_cache(*ptep) 408 409 /* 410 * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that 411 * are !pte_none() && !pte_present(). 412 * 413 * Format of swap PTEs (32bit): 414 * 415 * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 416 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 417 * <---------------- offset -----------------> P E <ofs> < type -> 418 * 419 * E is the exclusive marker that is not stored in swap entries. 420 * _PAGE_PRESENT (P) must be 0. 421 * 422 * For the 64bit version, the offset is extended by 32bit. 423 */ 424 #define __swp_type(x) ((x).val & 0x1f) 425 #define __swp_offset(x) ( (((x).val >> 5) & 0x7) | \ 426 (((x).val >> 10) << 3) ) 427 #define __swp_entry(type, offset) ((swp_entry_t) { \ 428 ((type) & 0x1f) | \ 429 ((offset & 0x7) << 5) | \ 430 ((offset >> 3) << 10) }) 431 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 432 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 433 434 static inline int pte_swp_exclusive(pte_t pte) 435 { 436 return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; 437 } 438 439 static inline pte_t pte_swp_mkexclusive(pte_t pte) 440 { 441 pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; 442 return pte; 443 } 444 445 static inline pte_t pte_swp_clear_exclusive(pte_t pte) 446 { 447 pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; 448 return pte; 449 } 450 451 static inline pte_t ptep_get(pte_t *ptep) 452 { 453 return READ_ONCE(*ptep); 454 } 455 #define ptep_get ptep_get 456 457 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) 458 { 459 pte_t pte; 460 461 pte = ptep_get(ptep); 462 if (!pte_young(pte)) { 463 return 0; 464 } 465 set_pte(ptep, pte_mkold(pte)); 466 return 1; 467 } 468 469 int ptep_clear_flush_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); 470 pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep); 471 472 struct mm_struct; 473 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 474 { 475 set_pte(ptep, pte_wrprotect(*ptep)); 476 } 477 478 #define pte_same(A,B) (pte_val(A) == pte_val(B)) 479 480 #endif /* !__ASSEMBLY__ */ 481 482 483 /* TLB page size encoding - see table 3-1 in parisc20.pdf */ 484 #define _PAGE_SIZE_ENCODING_4K 0 485 #define _PAGE_SIZE_ENCODING_16K 1 486 #define _PAGE_SIZE_ENCODING_64K 2 487 #define _PAGE_SIZE_ENCODING_256K 3 488 #define _PAGE_SIZE_ENCODING_1M 4 489 #define _PAGE_SIZE_ENCODING_4M 5 490 #define _PAGE_SIZE_ENCODING_16M 6 491 #define _PAGE_SIZE_ENCODING_64M 7 492 493 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB) 494 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K 495 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB) 496 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K 497 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB) 498 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K 499 #endif 500 501 502 #define pgprot_noncached(prot) __pgprot(pgprot_val(prot) | _PAGE_NO_CACHE) 503 504 /* We provide our own get_unmapped_area to provide cache coherency */ 505 506 #define HAVE_ARCH_UNMAPPED_AREA 507 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN 508 509 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG 510 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH 511 #define __HAVE_ARCH_PTEP_CLEAR_FLUSH 512 #define __HAVE_ARCH_PTEP_SET_WRPROTECT 513 #define __HAVE_ARCH_PTE_SAME 514 515 #endif /* _PARISC_PGTABLE_H */ 516