1 #ifndef _SPARC_PGTABLE_H
2 #define _SPARC_PGTABLE_H
4 /* asm/pgtable.h: Defines and functions used to work
5 * with Sparc page tables.
7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
11 #include <linux/const.h>
14 #include <asm-generic/4level-fixup.h>
16 #include <linux/spinlock.h>
17 #include <linux/swap.h>
18 #include <asm/types.h>
19 #include <asm/pgtsrmmu.h>
20 #include <asm/oplib.h>
21 #include <asm/btfixup.h>
22 #include <asm/cpu_type.h>
25 struct vm_area_struct;
28 extern void load_mmu(void);
29 extern unsigned long calc_highpages(void);
31 #define pte_ERROR(e) __builtin_trap()
32 #define pmd_ERROR(e) __builtin_trap()
33 #define pgd_ERROR(e) __builtin_trap()
36 #define PMD_SIZE (1UL << PMD_SHIFT)
37 #define PMD_MASK (~(PMD_SIZE-1))
38 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
39 #define PGDIR_SHIFT SRMMU_PGDIR_SHIFT
40 #define PGDIR_SIZE SRMMU_PGDIR_SIZE
41 #define PGDIR_MASK SRMMU_PGDIR_MASK
42 #define PTRS_PER_PTE 1024
43 #define PTRS_PER_PMD SRMMU_PTRS_PER_PMD
44 #define PTRS_PER_PGD SRMMU_PTRS_PER_PGD
45 #define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE
46 #define FIRST_USER_ADDRESS 0
47 #define PTE_SIZE (PTRS_PER_PTE*4)
49 #define PAGE_NONE SRMMU_PAGE_NONE
50 #define PAGE_SHARED SRMMU_PAGE_SHARED
51 #define PAGE_COPY SRMMU_PAGE_COPY
52 #define PAGE_READONLY SRMMU_PAGE_RDONLY
53 #define PAGE_KERNEL SRMMU_PAGE_KERNEL
55 /* Top-level page directory */
56 extern pgd_t swapper_pg_dir[1024];
58 extern void paging_init(void);
60 extern unsigned long ptr_in_current_pgd;
63 #define __P000 PAGE_NONE
64 #define __P001 PAGE_READONLY
65 #define __P010 PAGE_COPY
66 #define __P011 PAGE_COPY
67 #define __P100 PAGE_READONLY
68 #define __P101 PAGE_READONLY
69 #define __P110 PAGE_COPY
70 #define __P111 PAGE_COPY
72 #define __S000 PAGE_NONE
73 #define __S001 PAGE_READONLY
74 #define __S010 PAGE_SHARED
75 #define __S011 PAGE_SHARED
76 #define __S100 PAGE_READONLY
77 #define __S101 PAGE_READONLY
78 #define __S110 PAGE_SHARED
79 #define __S111 PAGE_SHARED
81 extern int num_contexts;
83 /* First physical page can be anywhere, the following is needed so that
84 * va-->pa and vice versa conversions work properly without performance
85 * hit for all __pa()/__va() operations.
87 extern unsigned long phys_base;
88 extern unsigned long pfn_base;
91 * BAD_PAGETABLE is used when we need a bogus page-table, while
92 * BAD_PAGE is used for a bogus page.
94 * ZERO_PAGE is a global shared page that is always zero: used
95 * for zero-mapped memory areas etc..
97 extern pte_t * __bad_pagetable(void);
98 extern pte_t __bad_page(void);
99 extern unsigned long empty_zero_page;
101 #define BAD_PAGETABLE __bad_pagetable()
102 #define BAD_PAGE __bad_page()
103 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
106 * In general all page table modifications should use the V8 atomic
107 * swap instruction. This insures the mmu and the cpu are in sync
108 * with respect to ref/mod bits in the page tables.
110 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value)
112 __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr));
116 static inline void srmmu_set_pte(pte_t *ptep, pte_t pteval)
118 srmmu_swap((unsigned long *)ptep, pte_val(pteval));
121 static inline int srmmu_device_memory(unsigned long x)
123 return ((x & 0xF0000000) != 0);
126 static inline struct page *pmd_page(pmd_t pmd)
128 if (srmmu_device_memory(pmd_val(pmd)))
130 return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4));
133 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
135 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
137 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
139 static inline int pte_none(pte_t pte)
141 return !pte_val(pte);
144 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
146 static inline void __pte_clear(pte_t *ptep)
148 srmmu_set_pte(ptep, __pte(0));
151 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
156 static inline int pmd_bad(pmd_t pmd)
158 return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
161 static inline int pmd_present(pmd_t pmd)
163 return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
166 static inline int pmd_none(pmd_t pmd)
168 return !pmd_val(pmd);
171 static inline void pmd_clear(pmd_t *pmdp)
174 for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++)
175 srmmu_set_pte((pte_t *)&pmdp->pmdv[i], __pte(0));
178 static inline int pgd_none(pgd_t pgd)
180 return !(pgd_val(pgd) & 0xFFFFFFF);
183 static inline int pgd_bad(pgd_t pgd)
185 return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD;
188 static inline int pgd_present(pgd_t pgd)
190 return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD);
193 static inline void pgd_clear(pgd_t *pgdp)
195 srmmu_set_pte((pte_t *)pgdp, __pte(0));
199 * The following only work if pte_present() is true.
200 * Undefined behaviour if not..
202 BTFIXUPDEF_HALF(pte_writei)
203 BTFIXUPDEF_HALF(pte_dirtyi)
204 BTFIXUPDEF_HALF(pte_youngi)
206 static int pte_write(pte_t pte) __attribute_const__;
207 static inline int pte_write(pte_t pte)
209 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
212 static int pte_dirty(pte_t pte) __attribute_const__;
213 static inline int pte_dirty(pte_t pte)
215 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
218 static int pte_young(pte_t pte) __attribute_const__;
219 static inline int pte_young(pte_t pte)
221 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
225 * The following only work if pte_present() is not true.
227 BTFIXUPDEF_HALF(pte_filei)
229 static int pte_file(pte_t pte) __attribute_const__;
230 static inline int pte_file(pte_t pte)
232 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
235 static inline int pte_special(pte_t pte)
242 BTFIXUPDEF_HALF(pte_wrprotecti)
243 BTFIXUPDEF_HALF(pte_mkcleani)
244 BTFIXUPDEF_HALF(pte_mkoldi)
246 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
247 static inline pte_t pte_wrprotect(pte_t pte)
249 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
252 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
253 static inline pte_t pte_mkclean(pte_t pte)
255 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
258 static pte_t pte_mkold(pte_t pte) __attribute_const__;
259 static inline pte_t pte_mkold(pte_t pte)
261 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
264 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
265 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
266 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
268 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
269 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
270 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
272 #define pte_mkspecial(pte) (pte)
274 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
276 static inline unsigned long pte_pfn(pte_t pte)
278 if (srmmu_device_memory(pte_val(pte))) {
279 /* Just return something that will cause
280 * pfn_valid() to return false. This makes
281 * copy_one_pte() to just directly copy to
286 return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4);
289 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
292 * Conversion functions: convert a page and protection to a page entry,
293 * and a page entry and page directory to the page they refer to.
295 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
297 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
298 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
300 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
301 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
302 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
304 #define pgprot_noncached pgprot_noncached
305 static inline pgprot_t pgprot_noncached(pgprot_t prot)
307 prot &= ~__pgprot(SRMMU_CACHE);
311 BTFIXUPDEF_INT(pte_modify_mask)
313 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
314 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
316 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
317 pgprot_val(newprot));
320 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
322 /* to find an entry in a page-table-directory */
323 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
325 /* to find an entry in a kernel page-table-directory */
326 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
328 /* Find an entry in the second-level page table.. */
329 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
330 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
332 /* Find an entry in the third-level page table.. */
333 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
334 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
337 * This shortcut works on sun4m (and sun4d) because the nocache area is static.
339 #define pte_offset_map(d, a) pte_offset_kernel(d,a)
340 #define pte_unmap(pte) do{}while(0)
342 /* Certain architectures need to do special things when pte's
343 * within a page table are directly modified. Thus, the following
344 * hook is made available.
347 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
349 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
350 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
353 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
355 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
357 /* Fault handler stuff... */
358 #define FAULT_CODE_PROT 0x1
359 #define FAULT_CODE_WRITE 0x2
360 #define FAULT_CODE_USER 0x4
362 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
364 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
366 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
367 unsigned long, unsigned int)
368 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
369 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
370 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
372 extern int invalid_segment;
374 /* Encode and de-code a swap entry */
375 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
376 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
377 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
379 #define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
380 #define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
381 #define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
383 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
384 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
386 /* file-offset-in-pte helpers */
387 static inline unsigned long pte_to_pgoff(pte_t pte)
389 return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT;
392 static inline pte_t pgoff_to_pte(unsigned long pgoff)
394 return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE);
398 * This is made a constant because mm/fremap.c required a constant.
400 #define PTE_FILE_MAX_BITS 24
405 struct ctx_list *next;
406 struct ctx_list *prev;
407 unsigned int ctx_number;
408 struct mm_struct *ctx_mm;
411 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
412 extern struct ctx_list ctx_free; /* Head of free list */
413 extern struct ctx_list ctx_used; /* Head of used contexts list */
415 #define NO_CONTEXT -1
417 static inline void remove_from_ctx_list(struct ctx_list *entry)
419 entry->next->prev = entry->prev;
420 entry->prev->next = entry->next;
423 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
426 (entry->prev = head->prev)->next = entry;
429 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
430 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
432 static inline unsigned long
433 __get_phys (unsigned long addr)
435 switch (sparc_cpu_model){
438 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
445 __get_iospace (unsigned long addr)
447 switch (sparc_cpu_model){
450 return (srmmu_get_pte (addr) >> 28);
456 extern unsigned long *sparc_valid_addr_bitmap;
458 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
459 #define kern_addr_valid(addr) \
460 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
463 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
464 * its high 4 bits. These macros/functions put it there or get it from there.
466 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
467 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
468 #define GET_PFN(pfn) (pfn & 0x0fffffffUL)
470 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
471 unsigned long, pgprot_t);
473 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
474 unsigned long from, unsigned long pfn,
475 unsigned long size, pgprot_t prot)
477 unsigned long long offset, space, phys_base;
479 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
480 space = GET_IOSPACE(pfn);
481 phys_base = offset | (space << 32ULL);
483 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
486 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
487 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
489 int __changed = !pte_same(*(__ptep), __entry); \
491 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
492 flush_tlb_page(__vma, __address); \
497 #include <asm-generic/pgtable.h>
499 #endif /* !(__ASSEMBLY__) */
501 #define VMALLOC_START _AC(0xfe600000,UL)
502 #define VMALLOC_END _AC(0xffc00000,UL)
504 /* We provide our own get_unmapped_area to cope with VA holes for userland */
505 #define HAVE_ARCH_UNMAPPED_AREA
508 * No page table caches to initialise
510 #define pgtable_cache_init() do { } while (0)
512 #endif /* !(_SPARC_PGTABLE_H) */