1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _PARISC_PGTABLE_H
3 #define _PARISC_PGTABLE_H
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>
13 #include <asm/fixmap.h>
17 * we simulate an x86-style page table for the linux mm code
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>
26 static inline spinlock_t *pgd_spinlock(pgd_t *);
29 * kern_addr_valid(ADDR) tests if ADDR is pointing to valid kernel
30 * memory. For the return value to be meaningful, ADDR must be >=
31 * PAGE_OFFSET. This operation can be relatively expensive (e.g.,
32 * require a hash-, or multi-level tree-lookup or something of that
33 * sort) but it guarantees to return TRUE only if accessing the page
34 * at that address does not cause an error. Note that there may be
35 * addresses for which kern_addr_valid() returns FALSE even though an
36 * access would not cause an error (e.g., this is typically true for
37 * memory mapped I/O regions.
39 * XXX Need to implement this for parisc.
41 #define kern_addr_valid(addr) (1)
43 /* This is for the serialization of PxTLB broadcasts. At least on the N class
44 * systems, only one PxTLB inter processor broadcast can be active at any one
45 * time on the Merced bus.
47 * PTE updates are protected by locks in the PMD.
49 extern spinlock_t pa_tlb_flush_lock;
50 extern spinlock_t pa_swapper_pg_lock;
51 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
52 extern int pa_serialize_tlb_flushes;
54 #define pa_serialize_tlb_flushes (0)
57 #define purge_tlb_start(flags) do { \
58 if (pa_serialize_tlb_flushes) \
59 spin_lock_irqsave(&pa_tlb_flush_lock, flags); \
61 local_irq_save(flags); \
63 #define purge_tlb_end(flags) do { \
64 if (pa_serialize_tlb_flushes) \
65 spin_unlock_irqrestore(&pa_tlb_flush_lock, flags); \
67 local_irq_restore(flags); \
70 /* Purge data and instruction TLB entries. The TLB purge instructions
71 * are slow on SMP machines since the purge must be broadcast to all CPUs.
74 static inline void purge_tlb_entries(struct mm_struct *mm, unsigned long addr)
78 purge_tlb_start(flags);
85 /* Certain architectures need to do special things when PTEs
86 * within a page table are directly modified. Thus, the following
87 * hook is made available.
89 #define set_pte(pteptr, pteval) \
91 *(pteptr) = (pteval); \
94 #define set_pte_at(mm, addr, ptep, pteval) \
97 unsigned long flags; \
98 spin_lock_irqsave(pgd_spinlock((mm)->pgd), flags);\
100 set_pte(ptep, pteval); \
101 purge_tlb_entries(mm, addr); \
102 spin_unlock_irqrestore(pgd_spinlock((mm)->pgd), flags);\
105 #endif /* !__ASSEMBLY__ */
107 #define pte_ERROR(e) \
108 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
109 #if CONFIG_PGTABLE_LEVELS == 3
110 #define pmd_ERROR(e) \
111 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, (unsigned long)pmd_val(e))
113 #define pgd_ERROR(e) \
114 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, (unsigned long)pgd_val(e))
116 /* This is the size of the initially mapped kernel memory */
117 #if defined(CONFIG_64BIT)
118 #define KERNEL_INITIAL_ORDER 26 /* 1<<26 = 64MB */
120 #define KERNEL_INITIAL_ORDER 25 /* 1<<25 = 32MB */
122 #define KERNEL_INITIAL_SIZE (1 << KERNEL_INITIAL_ORDER)
124 #if CONFIG_PGTABLE_LEVELS == 3
125 #define PGD_ORDER 1 /* Number of pages per pgd */
126 #define PMD_ORDER 1 /* Number of pages per pmd */
127 #define PGD_ALLOC_ORDER (2 + 1) /* first pgd contains pmd */
129 #define PGD_ORDER 1 /* Number of pages per pgd */
130 #define PGD_ALLOC_ORDER (PGD_ORDER + 1)
133 /* Definitions for 3rd level (we use PLD here for Page Lower directory
134 * because PTE_SHIFT is used lower down to mean shift that has to be
135 * done to get usable bits out of the PTE) */
136 #define PLD_SHIFT PAGE_SHIFT
137 #define PLD_SIZE PAGE_SIZE
138 #define BITS_PER_PTE (PAGE_SHIFT - BITS_PER_PTE_ENTRY)
139 #define PTRS_PER_PTE (1UL << BITS_PER_PTE)
141 /* Definitions for 2nd level */
142 #if CONFIG_PGTABLE_LEVELS == 3
143 #define PMD_SHIFT (PLD_SHIFT + BITS_PER_PTE)
144 #define PMD_SIZE (1UL << PMD_SHIFT)
145 #define PMD_MASK (~(PMD_SIZE-1))
146 #define BITS_PER_PMD (PAGE_SHIFT + PMD_ORDER - BITS_PER_PMD_ENTRY)
147 #define PTRS_PER_PMD (1UL << BITS_PER_PMD)
149 #define BITS_PER_PMD 0
152 /* Definitions for 1st level */
153 #define PGDIR_SHIFT (PLD_SHIFT + BITS_PER_PTE + BITS_PER_PMD)
154 #if (PGDIR_SHIFT + PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY) > BITS_PER_LONG
155 #define BITS_PER_PGD (BITS_PER_LONG - PGDIR_SHIFT)
157 #define BITS_PER_PGD (PAGE_SHIFT + PGD_ORDER - BITS_PER_PGD_ENTRY)
159 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
160 #define PGDIR_MASK (~(PGDIR_SIZE-1))
161 #define PTRS_PER_PGD (1UL << BITS_PER_PGD)
162 #define USER_PTRS_PER_PGD PTRS_PER_PGD
165 #define MAX_ADDRBITS (PGDIR_SHIFT + BITS_PER_PGD)
166 #define MAX_ADDRESS (1UL << MAX_ADDRBITS)
167 #define SPACEID_SHIFT (MAX_ADDRBITS - 32)
169 #define MAX_ADDRBITS (BITS_PER_LONG)
170 #define MAX_ADDRESS (1UL << MAX_ADDRBITS)
171 #define SPACEID_SHIFT 0
174 /* This calculates the number of initial pages we need for the initial
176 #if (KERNEL_INITIAL_ORDER) >= (PMD_SHIFT)
177 # define PT_INITIAL (1 << (KERNEL_INITIAL_ORDER - PMD_SHIFT))
179 # define PT_INITIAL (1) /* all initial PTEs fit into one page */
183 * pgd entries used up by user/kernel:
186 #define FIRST_USER_ADDRESS 0UL
188 /* NB: The tlb miss handlers make certain assumptions about the order */
189 /* of the following bits, so be careful (One example, bits 25-31 */
190 /* are moved together in one instruction). */
192 #define _PAGE_READ_BIT 31 /* (0x001) read access allowed */
193 #define _PAGE_WRITE_BIT 30 /* (0x002) write access allowed */
194 #define _PAGE_EXEC_BIT 29 /* (0x004) execute access allowed */
195 #define _PAGE_GATEWAY_BIT 28 /* (0x008) privilege promotion allowed */
196 #define _PAGE_DMB_BIT 27 /* (0x010) Data Memory Break enable (B bit) */
197 #define _PAGE_DIRTY_BIT 26 /* (0x020) Page Dirty (D bit) */
198 #define _PAGE_REFTRAP_BIT 25 /* (0x040) Page Ref. Trap enable (T bit) */
199 #define _PAGE_NO_CACHE_BIT 24 /* (0x080) Uncached Page (U bit) */
200 #define _PAGE_ACCESSED_BIT 23 /* (0x100) Software: Page Accessed */
201 #define _PAGE_PRESENT_BIT 22 /* (0x200) Software: translation valid */
202 #define _PAGE_HPAGE_BIT 21 /* (0x400) Software: Huge Page */
203 #define _PAGE_USER_BIT 20 /* (0x800) Software: User accessible page */
205 /* N.B. The bits are defined in terms of a 32 bit word above, so the */
206 /* following macro is ok for both 32 and 64 bit. */
208 #define xlate_pabit(x) (31 - x)
210 /* this defines the shift to the usable bits in the PTE it is set so
211 * that the valid bits _PAGE_PRESENT_BIT and _PAGE_USER_BIT are set
213 #define PTE_SHIFT xlate_pabit(_PAGE_USER_BIT)
215 /* PFN_PTE_SHIFT defines the shift of a PTE value to access the PFN field */
216 #define PFN_PTE_SHIFT 12
218 #define _PAGE_READ (1 << xlate_pabit(_PAGE_READ_BIT))
219 #define _PAGE_WRITE (1 << xlate_pabit(_PAGE_WRITE_BIT))
220 #define _PAGE_RW (_PAGE_READ | _PAGE_WRITE)
221 #define _PAGE_EXEC (1 << xlate_pabit(_PAGE_EXEC_BIT))
222 #define _PAGE_GATEWAY (1 << xlate_pabit(_PAGE_GATEWAY_BIT))
223 #define _PAGE_DMB (1 << xlate_pabit(_PAGE_DMB_BIT))
224 #define _PAGE_DIRTY (1 << xlate_pabit(_PAGE_DIRTY_BIT))
225 #define _PAGE_REFTRAP (1 << xlate_pabit(_PAGE_REFTRAP_BIT))
226 #define _PAGE_NO_CACHE (1 << xlate_pabit(_PAGE_NO_CACHE_BIT))
227 #define _PAGE_ACCESSED (1 << xlate_pabit(_PAGE_ACCESSED_BIT))
228 #define _PAGE_PRESENT (1 << xlate_pabit(_PAGE_PRESENT_BIT))
229 #define _PAGE_HUGE (1 << xlate_pabit(_PAGE_HPAGE_BIT))
230 #define _PAGE_USER (1 << xlate_pabit(_PAGE_USER_BIT))
232 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_ACCESSED)
233 #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
234 #define _PAGE_KERNEL_RO (_PAGE_PRESENT | _PAGE_READ | _PAGE_DIRTY | _PAGE_ACCESSED)
235 #define _PAGE_KERNEL_EXEC (_PAGE_KERNEL_RO | _PAGE_EXEC)
236 #define _PAGE_KERNEL_RWX (_PAGE_KERNEL_EXEC | _PAGE_WRITE)
237 #define _PAGE_KERNEL (_PAGE_KERNEL_RO | _PAGE_WRITE)
239 /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds
240 * are page-aligned, we don't care about the PAGE_OFFSET bits, except
241 * for a few meta-information bits, so we shift the address to be
242 * able to effectively address 40/42/44-bits of physical address space
243 * depending on 4k/16k/64k PAGE_SIZE */
244 #define _PxD_PRESENT_BIT 31
245 #define _PxD_ATTACHED_BIT 30
246 #define _PxD_VALID_BIT 29
248 #define PxD_FLAG_PRESENT (1 << xlate_pabit(_PxD_PRESENT_BIT))
249 #define PxD_FLAG_ATTACHED (1 << xlate_pabit(_PxD_ATTACHED_BIT))
250 #define PxD_FLAG_VALID (1 << xlate_pabit(_PxD_VALID_BIT))
251 #define PxD_FLAG_MASK (0xf)
252 #define PxD_FLAG_SHIFT (4)
253 #define PxD_VALUE_SHIFT (PFN_PTE_SHIFT-PxD_FLAG_SHIFT)
257 #define PAGE_NONE __pgprot(_PAGE_PRESENT | _PAGE_USER)
258 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE)
259 /* Others seem to make this executable, I don't know if that's correct
260 or not. The stack is mapped this way though so this is necessary
261 in the short term - dhd@linuxcare.com, 2000-08-08 */
262 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ)
263 #define PAGE_WRITEONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITE)
264 #define PAGE_EXECREAD __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_EXEC)
265 #define PAGE_COPY PAGE_EXECREAD
266 #define PAGE_RWX __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
267 #define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
268 #define PAGE_KERNEL_EXEC __pgprot(_PAGE_KERNEL_EXEC)
269 #define PAGE_KERNEL_RWX __pgprot(_PAGE_KERNEL_RWX)
270 #define PAGE_KERNEL_RO __pgprot(_PAGE_KERNEL_RO)
271 #define PAGE_KERNEL_UNC __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
272 #define PAGE_GATEWAY __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_GATEWAY| _PAGE_READ)
276 * We could have an execute only page using "gateway - promote to priv
277 * level 3", but that is kind of silly. So, the way things are defined
278 * now, we must always have read permission for pages with execute
279 * permission. For the fun of it we'll go ahead and support write only
284 #define __P000 PAGE_NONE
285 #define __P001 PAGE_READONLY
286 #define __P010 __P000 /* copy on write */
287 #define __P011 __P001 /* copy on write */
288 #define __P100 PAGE_EXECREAD
289 #define __P101 PAGE_EXECREAD
290 #define __P110 __P100 /* copy on write */
291 #define __P111 __P101 /* copy on write */
293 #define __S000 PAGE_NONE
294 #define __S001 PAGE_READONLY
295 #define __S010 PAGE_WRITEONLY
296 #define __S011 PAGE_SHARED
297 #define __S100 PAGE_EXECREAD
298 #define __S101 PAGE_EXECREAD
299 #define __S110 PAGE_RWX
300 #define __S111 PAGE_RWX
303 extern pgd_t swapper_pg_dir[]; /* declared in init_task.c */
305 /* initial page tables for 0-8MB for kernel */
309 /* zero page used for uninitialized stuff */
311 extern unsigned long *empty_zero_page;
314 * ZERO_PAGE is a global shared page that is always zero: used
315 * for zero-mapped memory areas etc..
318 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
320 #define pte_none(x) (pte_val(x) == 0)
321 #define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
322 #define pte_clear(mm, addr, xp) set_pte_at(mm, addr, xp, __pte(0))
324 #define pmd_flag(x) (pmd_val(x) & PxD_FLAG_MASK)
325 #define pmd_address(x) ((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)
326 #define pud_flag(x) (pud_val(x) & PxD_FLAG_MASK)
327 #define pud_address(x) ((unsigned long)(pud_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)
328 #define pgd_flag(x) (pgd_val(x) & PxD_FLAG_MASK)
329 #define pgd_address(x) ((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)
331 #if CONFIG_PGTABLE_LEVELS == 3
332 /* The first entry of the permanent pmd is not there if it contains
333 * the gateway marker */
334 #define pmd_none(x) (!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED)
336 #define pmd_none(x) (!pmd_val(x))
338 #define pmd_bad(x) (!(pmd_flag(x) & PxD_FLAG_VALID))
339 #define pmd_present(x) (pmd_flag(x) & PxD_FLAG_PRESENT)
340 static inline void pmd_clear(pmd_t *pmd) {
341 #if CONFIG_PGTABLE_LEVELS == 3
342 if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
343 /* This is the entry pointing to the permanent pmd
344 * attached to the pgd; cannot clear it */
345 set_pmd(pmd, __pmd(PxD_FLAG_ATTACHED));
348 set_pmd(pmd, __pmd(0));
353 #if CONFIG_PGTABLE_LEVELS == 3
354 #define pud_page_vaddr(pud) ((unsigned long) __va(pud_address(pud)))
355 #define pud_page(pud) virt_to_page((void *)pud_page_vaddr(pud))
357 /* For 64 bit we have three level tables */
359 #define pud_none(x) (!pud_val(x))
360 #define pud_bad(x) (!(pud_flag(x) & PxD_FLAG_VALID))
361 #define pud_present(x) (pud_flag(x) & PxD_FLAG_PRESENT)
362 static inline void pud_clear(pud_t *pud) {
363 #if CONFIG_PGTABLE_LEVELS == 3
364 if(pud_flag(*pud) & PxD_FLAG_ATTACHED)
365 /* This is the permanent pmd attached to the pud; cannot
369 set_pud(pud, __pud(0));
374 * The following only work if pte_present() is true.
375 * Undefined behaviour if not..
377 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
378 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
379 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
380 static inline int pte_special(pte_t pte) { return 0; }
382 static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
383 static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
384 static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; return pte; }
385 static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
386 static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
387 static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; }
388 static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
391 * Huge pte definitions.
393 #ifdef CONFIG_HUGETLB_PAGE
394 #define pte_huge(pte) (pte_val(pte) & _PAGE_HUGE)
395 #define pte_mkhuge(pte) (__pte(pte_val(pte) | \
396 (parisc_requires_coherency() ? 0 : _PAGE_HUGE)))
398 #define pte_huge(pte) (0)
399 #define pte_mkhuge(pte) (pte)
404 * Conversion functions: convert a page and protection to a page entry,
405 * and a page entry and page directory to the page they refer to.
407 #define __mk_pte(addr,pgprot) \
411 pte_val(__pte) = ((((addr)>>PAGE_SHIFT)<<PFN_PTE_SHIFT) + pgprot_val(pgprot)); \
416 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
418 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t pgprot)
421 pte_val(pte) = (pfn << PFN_PTE_SHIFT) | pgprot_val(pgprot);
425 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
426 { pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
428 /* Permanent address of a page. On parisc we don't have highmem. */
430 #define pte_pfn(x) (pte_val(x) >> PFN_PTE_SHIFT)
432 #define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
434 #define pmd_page_vaddr(pmd) ((unsigned long) __va(pmd_address(pmd)))
436 #define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd)))
437 #define pmd_page(pmd) virt_to_page((void *)__pmd_page(pmd))
439 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
441 /* to find an entry in a page-table-directory */
442 #define pgd_offset(mm, address) \
443 ((mm)->pgd + ((address) >> PGDIR_SHIFT))
445 /* to find an entry in a kernel page-table-directory */
446 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
448 /* Find an entry in the second-level page table.. */
450 #if CONFIG_PGTABLE_LEVELS == 3
451 #define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
452 #define pmd_offset(dir,address) \
453 ((pmd_t *) pud_page_vaddr(*(dir)) + pmd_index(address))
455 #define pmd_offset(dir,addr) ((pmd_t *) dir)
458 /* Find an entry in the third-level page table.. */
459 #define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
460 #define pte_offset_kernel(pmd, address) \
461 ((pte_t *) pmd_page_vaddr(*(pmd)) + pte_index(address))
462 #define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
463 #define pte_unmap(pte) do { } while (0)
465 #define pte_unmap(pte) do { } while (0)
466 #define pte_unmap_nested(pte) do { } while (0)
468 extern void paging_init (void);
470 /* Used for deferring calls to flush_dcache_page() */
472 #define PG_dcache_dirty PG_arch_1
474 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
476 /* Encode and de-code a swap entry */
478 #define __swp_type(x) ((x).val & 0x1f)
479 #define __swp_offset(x) ( (((x).val >> 6) & 0x7) | \
480 (((x).val >> 8) & ~0x7) )
481 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | \
482 ((offset & 0x7) << 6) | \
483 ((offset & ~0x7) << 8) })
484 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
485 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
488 static inline spinlock_t *pgd_spinlock(pgd_t *pgd)
490 if (unlikely(pgd == swapper_pg_dir))
491 return &pa_swapper_pg_lock;
492 return (spinlock_t *)((char *)pgd + (PAGE_SIZE << (PGD_ALLOC_ORDER - 1)));
496 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
501 if (!pte_young(*ptep))
504 spin_lock_irqsave(pgd_spinlock(vma->vm_mm->pgd), flags);
506 if (!pte_young(pte)) {
507 spin_unlock_irqrestore(pgd_spinlock(vma->vm_mm->pgd), flags);
510 set_pte(ptep, pte_mkold(pte));
511 purge_tlb_entries(vma->vm_mm, addr);
512 spin_unlock_irqrestore(pgd_spinlock(vma->vm_mm->pgd), flags);
517 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
522 spin_lock_irqsave(pgd_spinlock(mm->pgd), flags);
524 set_pte(ptep, __pte(0));
525 purge_tlb_entries(mm, addr);
526 spin_unlock_irqrestore(pgd_spinlock(mm->pgd), flags);
531 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
534 spin_lock_irqsave(pgd_spinlock(mm->pgd), flags);
535 set_pte(ptep, pte_wrprotect(*ptep));
536 purge_tlb_entries(mm, addr);
537 spin_unlock_irqrestore(pgd_spinlock(mm->pgd), flags);
540 #define pte_same(A,B) (pte_val(A) == pte_val(B))
543 extern void arch_report_meminfo(struct seq_file *m);
545 #endif /* !__ASSEMBLY__ */
548 /* TLB page size encoding - see table 3-1 in parisc20.pdf */
549 #define _PAGE_SIZE_ENCODING_4K 0
550 #define _PAGE_SIZE_ENCODING_16K 1
551 #define _PAGE_SIZE_ENCODING_64K 2
552 #define _PAGE_SIZE_ENCODING_256K 3
553 #define _PAGE_SIZE_ENCODING_1M 4
554 #define _PAGE_SIZE_ENCODING_4M 5
555 #define _PAGE_SIZE_ENCODING_16M 6
556 #define _PAGE_SIZE_ENCODING_64M 7
558 #if defined(CONFIG_PARISC_PAGE_SIZE_4KB)
559 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_4K
560 #elif defined(CONFIG_PARISC_PAGE_SIZE_16KB)
561 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_16K
562 #elif defined(CONFIG_PARISC_PAGE_SIZE_64KB)
563 # define _PAGE_SIZE_ENCODING_DEFAULT _PAGE_SIZE_ENCODING_64K
567 #define pgprot_noncached(prot) __pgprot(pgprot_val(prot) | _PAGE_NO_CACHE)
569 /* We provide our own get_unmapped_area to provide cache coherency */
571 #define HAVE_ARCH_UNMAPPED_AREA
572 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
574 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
575 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
576 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
577 #define __HAVE_ARCH_PTE_SAME
578 #include <asm-generic/pgtable.h>
580 #endif /* _PARISC_PGTABLE_H */