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/vac-ops.h>
21 #include <asm/oplib.h>
22 #include <asm/btfixup.h>
23 #include <asm/cpu_type.h>
26 struct vm_area_struct;
29 extern void load_mmu(void);
30 extern unsigned long calc_highpages(void);
32 BTFIXUPDEF_SIMM13(pgdir_shift)
33 BTFIXUPDEF_SETHI(pgdir_size)
34 BTFIXUPDEF_SETHI(pgdir_mask)
36 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
37 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
38 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
40 #define pte_ERROR(e) __builtin_trap()
41 #define pmd_ERROR(e) __builtin_trap()
42 #define pgd_ERROR(e) __builtin_trap()
44 BTFIXUPDEF_INT(page_none)
45 BTFIXUPDEF_INT(page_copy)
46 BTFIXUPDEF_INT(page_readonly)
47 BTFIXUPDEF_INT(page_kernel)
50 #define PMD_SIZE (1UL << PMD_SHIFT)
51 #define PMD_MASK (~(PMD_SIZE-1))
52 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
53 #define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
54 #define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
55 #define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
56 #define PTRS_PER_PTE 1024
57 #define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
58 #define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
59 #define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
60 #define FIRST_USER_ADDRESS 0
61 #define PTE_SIZE (PTRS_PER_PTE*4)
63 #define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
64 extern pgprot_t PAGE_SHARED;
65 #define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
66 #define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
68 extern unsigned long page_kernel;
71 #define PAGE_KERNEL page_kernel
73 #define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
76 /* Top-level page directory */
77 extern pgd_t swapper_pg_dir[1024];
79 extern void paging_init(void);
81 /* Page table for 0-4MB for everybody, on the Sparc this
82 * holds the same as on the i386.
84 extern pte_t pg0[1024];
85 extern pte_t pg1[1024];
86 extern pte_t pg2[1024];
87 extern pte_t pg3[1024];
89 extern unsigned long ptr_in_current_pgd;
91 /* Here is a trick, since mmap.c need the initializer elements for
92 * protection_map[] to be constant at compile time, I set the following
93 * to all zeros. I set it to the real values after I link in the
94 * appropriate MMU page table routines at boot time.
96 #define __P000 __pgprot(0)
97 #define __P001 __pgprot(0)
98 #define __P010 __pgprot(0)
99 #define __P011 __pgprot(0)
100 #define __P100 __pgprot(0)
101 #define __P101 __pgprot(0)
102 #define __P110 __pgprot(0)
103 #define __P111 __pgprot(0)
105 #define __S000 __pgprot(0)
106 #define __S001 __pgprot(0)
107 #define __S010 __pgprot(0)
108 #define __S011 __pgprot(0)
109 #define __S100 __pgprot(0)
110 #define __S101 __pgprot(0)
111 #define __S110 __pgprot(0)
112 #define __S111 __pgprot(0)
114 extern int num_contexts;
116 /* First physical page can be anywhere, the following is needed so that
117 * va-->pa and vice versa conversions work properly without performance
118 * hit for all __pa()/__va() operations.
120 extern unsigned long phys_base;
121 extern unsigned long pfn_base;
124 * BAD_PAGETABLE is used when we need a bogus page-table, while
125 * BAD_PAGE is used for a bogus page.
127 * ZERO_PAGE is a global shared page that is always zero: used
128 * for zero-mapped memory areas etc..
130 extern pte_t * __bad_pagetable(void);
131 extern pte_t __bad_page(void);
132 extern unsigned long empty_zero_page;
134 #define BAD_PAGETABLE __bad_pagetable()
135 #define BAD_PAGE __bad_page()
136 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
140 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
141 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
143 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
144 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
146 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
147 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
149 static inline int pte_none(pte_t pte)
151 return !pte_val(pte);
154 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
155 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
157 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
158 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
159 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
161 static inline int pmd_none(pmd_t pmd)
163 return !pmd_val(pmd);
166 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
167 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
168 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
170 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
171 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
172 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
173 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
175 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
176 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
177 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
178 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
181 * The following only work if pte_present() is true.
182 * Undefined behaviour if not..
184 BTFIXUPDEF_HALF(pte_writei)
185 BTFIXUPDEF_HALF(pte_dirtyi)
186 BTFIXUPDEF_HALF(pte_youngi)
188 static int pte_write(pte_t pte) __attribute_const__;
189 static inline int pte_write(pte_t pte)
191 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
194 static int pte_dirty(pte_t pte) __attribute_const__;
195 static inline int pte_dirty(pte_t pte)
197 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
200 static int pte_young(pte_t pte) __attribute_const__;
201 static inline int pte_young(pte_t pte)
203 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
207 * The following only work if pte_present() is not true.
209 BTFIXUPDEF_HALF(pte_filei)
211 static int pte_file(pte_t pte) __attribute_const__;
212 static inline int pte_file(pte_t pte)
214 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
217 static inline int pte_special(pte_t pte)
224 BTFIXUPDEF_HALF(pte_wrprotecti)
225 BTFIXUPDEF_HALF(pte_mkcleani)
226 BTFIXUPDEF_HALF(pte_mkoldi)
228 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
229 static inline pte_t pte_wrprotect(pte_t pte)
231 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
234 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
235 static inline pte_t pte_mkclean(pte_t pte)
237 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
240 static pte_t pte_mkold(pte_t pte) __attribute_const__;
241 static inline pte_t pte_mkold(pte_t pte)
243 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
246 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
247 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
248 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
250 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
251 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
252 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
254 #define pte_mkspecial(pte) (pte)
256 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
258 BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
259 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
260 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
263 * Conversion functions: convert a page and protection to a page entry,
264 * and a page entry and page directory to the page they refer to.
266 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
268 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
269 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
271 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
272 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
273 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
275 #define pgprot_noncached pgprot_noncached
276 static inline pgprot_t pgprot_noncached(pgprot_t prot)
278 prot &= ~__pgprot(SRMMU_CACHE);
282 BTFIXUPDEF_INT(pte_modify_mask)
284 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
285 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
287 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
288 pgprot_val(newprot));
291 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
293 /* to find an entry in a page-table-directory */
294 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
296 /* to find an entry in a kernel page-table-directory */
297 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
299 /* Find an entry in the second-level page table.. */
300 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
301 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
303 /* Find an entry in the third-level page table.. */
304 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
305 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
308 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
309 * and sun4c is guaranteed to have no highmem anyway.
311 #define pte_offset_map(d, a) pte_offset_kernel(d,a)
312 #define pte_unmap(pte) do{}while(0)
314 /* Certain architectures need to do special things when pte's
315 * within a page table are directly modified. Thus, the following
316 * hook is made available.
319 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
321 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
322 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
325 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
327 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
329 /* Fault handler stuff... */
330 #define FAULT_CODE_PROT 0x1
331 #define FAULT_CODE_WRITE 0x2
332 #define FAULT_CODE_USER 0x4
334 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
336 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
338 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
339 unsigned long, unsigned int)
340 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
341 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
342 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
344 extern int invalid_segment;
346 /* Encode and de-code a swap entry */
347 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
348 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
349 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
351 #define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
352 #define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
353 #define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
355 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
356 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
358 /* file-offset-in-pte helpers */
359 static inline unsigned long pte_to_pgoff(pte_t pte)
361 return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT;
364 static inline pte_t pgoff_to_pte(unsigned long pgoff)
366 return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE);
370 * This is made a constant because mm/fremap.c required a constant.
371 * Note that layout of these bits is different between sun4c.c and srmmu.c.
373 #define PTE_FILE_MAX_BITS 24
378 struct ctx_list *next;
379 struct ctx_list *prev;
380 unsigned int ctx_number;
381 struct mm_struct *ctx_mm;
384 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
385 extern struct ctx_list ctx_free; /* Head of free list */
386 extern struct ctx_list ctx_used; /* Head of used contexts list */
388 #define NO_CONTEXT -1
390 static inline void remove_from_ctx_list(struct ctx_list *entry)
392 entry->next->prev = entry->prev;
393 entry->prev->next = entry->next;
396 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
399 (entry->prev = head->prev)->next = entry;
402 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
403 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
405 static inline unsigned long
406 __get_phys (unsigned long addr)
408 switch (sparc_cpu_model){
411 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
418 __get_iospace (unsigned long addr)
420 switch (sparc_cpu_model){
423 return (srmmu_get_pte (addr) >> 28);
429 extern unsigned long *sparc_valid_addr_bitmap;
431 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
432 #define kern_addr_valid(addr) \
433 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
436 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
437 * its high 4 bits. These macros/functions put it there or get it from there.
439 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
440 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
441 #define GET_PFN(pfn) (pfn & 0x0fffffffUL)
443 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
444 unsigned long, pgprot_t);
446 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
447 unsigned long from, unsigned long pfn,
448 unsigned long size, pgprot_t prot)
450 unsigned long long offset, space, phys_base;
452 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
453 space = GET_IOSPACE(pfn);
454 phys_base = offset | (space << 32ULL);
456 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
459 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
460 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
462 int __changed = !pte_same(*(__ptep), __entry); \
464 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
465 flush_tlb_page(__vma, __address); \
470 #include <asm-generic/pgtable.h>
472 #endif /* !(__ASSEMBLY__) */
474 #define VMALLOC_START _AC(0xfe600000,UL)
475 /* XXX Alter this when I get around to fixing sun4c - Anton */
476 #define VMALLOC_END _AC(0xffc00000,UL)
479 /* We provide our own get_unmapped_area to cope with VA holes for userland */
480 #define HAVE_ARCH_UNMAPPED_AREA
483 * No page table caches to initialise
485 #define pgtable_cache_init() do { } while (0)
487 #endif /* !(_SPARC_PGTABLE_H) */