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)
12 #include <asm-generic/4level-fixup.h>
14 #include <linux/spinlock.h>
15 #include <linux/swap.h>
16 #include <asm/types.h>
17 #include <asm/pgtsun4c.h>
18 #include <asm/pgtsrmmu.h>
19 #include <asm/vac-ops.h>
20 #include <asm/oplib.h>
21 #include <asm/btfixup.h>
22 #include <asm/system.h>
25 struct vm_area_struct;
28 extern void load_mmu(void);
29 extern unsigned long calc_highpages(void);
31 BTFIXUPDEF_SIMM13(pgdir_shift)
32 BTFIXUPDEF_SETHI(pgdir_size)
33 BTFIXUPDEF_SETHI(pgdir_mask)
35 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
36 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
37 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
39 #define pte_ERROR(e) __builtin_trap()
40 #define pmd_ERROR(e) __builtin_trap()
41 #define pgd_ERROR(e) __builtin_trap()
43 BTFIXUPDEF_INT(page_none)
44 BTFIXUPDEF_INT(page_copy)
45 BTFIXUPDEF_INT(page_readonly)
46 BTFIXUPDEF_INT(page_kernel)
48 #define PMD_SHIFT SUN4C_PMD_SHIFT
49 #define PMD_SIZE (1UL << PMD_SHIFT)
50 #define PMD_MASK (~(PMD_SIZE-1))
51 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
52 #define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
53 #define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
54 #define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
55 #define PTRS_PER_PTE 1024
56 #define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
57 #define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
58 #define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
59 #define FIRST_USER_ADDRESS 0
60 #define PTE_SIZE (PTRS_PER_PTE*4)
62 #define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
63 extern pgprot_t PAGE_SHARED;
64 #define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
65 #define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
67 extern unsigned long page_kernel;
70 #define PAGE_KERNEL page_kernel
72 #define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
75 /* Top-level page directory */
76 extern pgd_t swapper_pg_dir[1024];
78 extern void paging_init(void);
80 /* Page table for 0-4MB for everybody, on the Sparc this
81 * holds the same as on the i386.
83 extern pte_t pg0[1024];
84 extern pte_t pg1[1024];
85 extern pte_t pg2[1024];
86 extern pte_t pg3[1024];
88 extern unsigned long ptr_in_current_pgd;
90 /* Here is a trick, since mmap.c need the initializer elements for
91 * protection_map[] to be constant at compile time, I set the following
92 * to all zeros. I set it to the real values after I link in the
93 * appropriate MMU page table routines at boot time.
95 #define __P000 __pgprot(0)
96 #define __P001 __pgprot(0)
97 #define __P010 __pgprot(0)
98 #define __P011 __pgprot(0)
99 #define __P100 __pgprot(0)
100 #define __P101 __pgprot(0)
101 #define __P110 __pgprot(0)
102 #define __P111 __pgprot(0)
104 #define __S000 __pgprot(0)
105 #define __S001 __pgprot(0)
106 #define __S010 __pgprot(0)
107 #define __S011 __pgprot(0)
108 #define __S100 __pgprot(0)
109 #define __S101 __pgprot(0)
110 #define __S110 __pgprot(0)
111 #define __S111 __pgprot(0)
113 extern int num_contexts;
115 /* First physical page can be anywhere, the following is needed so that
116 * va-->pa and vice versa conversions work properly without performance
117 * hit for all __pa()/__va() operations.
119 extern unsigned long phys_base;
120 extern unsigned long pfn_base;
123 * BAD_PAGETABLE is used when we need a bogus page-table, while
124 * BAD_PAGE is used for a bogus page.
126 * ZERO_PAGE is a global shared page that is always zero: used
127 * for zero-mapped memory areas etc..
129 extern pte_t * __bad_pagetable(void);
130 extern pte_t __bad_page(void);
131 extern unsigned long empty_zero_page;
133 #define BAD_PAGETABLE __bad_pagetable()
134 #define BAD_PAGE __bad_page()
135 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
139 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
140 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
142 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
143 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
145 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
146 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
148 static inline int pte_none(pte_t pte)
150 return !pte_val(pte);
153 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
154 #define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
156 BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
157 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
158 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
160 static inline int pmd_none(pmd_t pmd)
162 return !pmd_val(pmd);
165 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
166 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
167 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
169 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
170 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
171 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
172 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
174 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
175 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
176 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
177 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
180 * The following only work if pte_present() is true.
181 * Undefined behaviour if not..
183 BTFIXUPDEF_HALF(pte_writei)
184 BTFIXUPDEF_HALF(pte_dirtyi)
185 BTFIXUPDEF_HALF(pte_youngi)
187 static int pte_write(pte_t pte) __attribute_const__;
188 static inline int pte_write(pte_t pte)
190 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
193 static int pte_dirty(pte_t pte) __attribute_const__;
194 static inline int pte_dirty(pte_t pte)
196 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
199 static int pte_young(pte_t pte) __attribute_const__;
200 static inline int pte_young(pte_t pte)
202 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
206 * The following only work if pte_present() is not true.
208 BTFIXUPDEF_HALF(pte_filei)
210 static int pte_file(pte_t pte) __attribute_const__;
211 static inline int pte_file(pte_t pte)
213 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
216 static inline int pte_special(pte_t pte)
223 BTFIXUPDEF_HALF(pte_wrprotecti)
224 BTFIXUPDEF_HALF(pte_mkcleani)
225 BTFIXUPDEF_HALF(pte_mkoldi)
227 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
228 static inline pte_t pte_wrprotect(pte_t pte)
230 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
233 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
234 static inline pte_t pte_mkclean(pte_t pte)
236 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
239 static pte_t pte_mkold(pte_t pte) __attribute_const__;
240 static inline pte_t pte_mkold(pte_t pte)
242 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
245 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
246 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
247 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
249 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
250 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
251 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
253 #define pte_mkspecial(pte) (pte)
255 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
257 BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
258 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
259 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
262 * Conversion functions: convert a page and protection to a page entry,
263 * and a page entry and page directory to the page they refer to.
265 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
267 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
268 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
269 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
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) BTFIXUP_CALL(pgprot_noncached)(pgprot)
277 BTFIXUPDEF_INT(pte_modify_mask)
279 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
280 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
282 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
283 pgprot_val(newprot));
286 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
288 /* to find an entry in a page-table-directory */
289 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
291 /* to find an entry in a kernel page-table-directory */
292 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
294 /* Find an entry in the second-level page table.. */
295 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
296 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
298 /* Find an entry in the third-level page table.. */
299 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
300 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
303 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
304 * and sun4c is guaranteed to have no highmem anyway.
306 #define pte_offset_map(d, a) pte_offset_kernel(d,a)
307 #define pte_unmap(pte) do{}while(0)
309 /* Certain architectures need to do special things when pte's
310 * within a page table are directly modified. Thus, the following
311 * hook is made available.
314 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
316 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
317 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
320 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
322 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
324 /* Fault handler stuff... */
325 #define FAULT_CODE_PROT 0x1
326 #define FAULT_CODE_WRITE 0x2
327 #define FAULT_CODE_USER 0x4
329 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
331 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
333 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
334 unsigned long, unsigned int)
335 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
336 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
337 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
339 extern int invalid_segment;
341 /* Encode and de-code a swap entry */
342 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
343 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
344 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
346 #define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
347 #define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
348 #define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
350 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
351 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
353 /* file-offset-in-pte helpers */
354 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
355 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
357 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
358 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
361 * This is made a constant because mm/fremap.c required a constant.
362 * Note that layout of these bits is different between sun4c.c and srmmu.c.
364 #define PTE_FILE_MAX_BITS 24
369 struct ctx_list *next;
370 struct ctx_list *prev;
371 unsigned int ctx_number;
372 struct mm_struct *ctx_mm;
375 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
376 extern struct ctx_list ctx_free; /* Head of free list */
377 extern struct ctx_list ctx_used; /* Head of used contexts list */
379 #define NO_CONTEXT -1
381 static inline void remove_from_ctx_list(struct ctx_list *entry)
383 entry->next->prev = entry->prev;
384 entry->prev->next = entry->next;
387 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
390 (entry->prev = head->prev)->next = entry;
393 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
394 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
396 static inline unsigned long
397 __get_phys (unsigned long addr)
399 switch (sparc_cpu_model){
402 return sun4c_get_pte (addr) << PAGE_SHIFT;
405 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
412 __get_iospace (unsigned long addr)
414 switch (sparc_cpu_model){
417 return -1; /* Don't check iospace on sun4c */
420 return (srmmu_get_pte (addr) >> 28);
426 extern unsigned long *sparc_valid_addr_bitmap;
428 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
429 #define kern_addr_valid(addr) \
430 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
432 extern int io_remap_pfn_range(struct vm_area_struct *vma,
433 unsigned long from, unsigned long pfn,
434 unsigned long size, pgprot_t prot);
437 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
438 * its high 4 bits. These macros/functions put it there or get it from there.
440 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
441 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
442 #define GET_PFN(pfn) (pfn & 0x0fffffffUL)
444 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
445 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
447 int __changed = !pte_same(*(__ptep), __entry); \
449 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
450 flush_tlb_page(__vma, __address); \
452 (sparc_cpu_model == sun4c) || __changed; \
455 #include <asm-generic/pgtable.h>
457 #endif /* !(__ASSEMBLY__) */
459 #define VMALLOC_START 0xfe600000
460 /* XXX Alter this when I get around to fixing sun4c - Anton */
461 #define VMALLOC_END 0xffc00000
464 /* We provide our own get_unmapped_area to cope with VA holes for userland */
465 #define HAVE_ARCH_UNMAPPED_AREA
468 * No page table caches to initialise
470 #define pgtable_cache_init() do { } while (0)
472 #endif /* !(_SPARC_PGTABLE_H) */