1 #ifndef _SPARC_PGTABLE_H
2 #define _SPARC_PGTABLE_H
3
4 /* asm/pgtable.h: Defines and functions used to work
5 * with Sparc page tables.
6 *
7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11 #include <linux/const.h>
12
13 #ifndef __ASSEMBLY__
14 #include <asm-generic/4level-fixup.h>
15
16 #include <linux/spinlock.h>
17 #include <linux/swap.h>
18 #include <asm/types.h>
19 #include <asm/pgtsun4c.h>
20 #include <asm/pgtsrmmu.h>
21 #include <asm/vac-ops.h>
22 #include <asm/oplib.h>
23 #include <asm/btfixup.h>
24 #include <asm/cpu_type.h>
25
26
27 struct vm_area_struct;
28 struct page;
29
30 extern void load_mmu(void);
31 extern unsigned long calc_highpages(void);
32
33 BTFIXUPDEF_SIMM13(pgdir_shift)
34 BTFIXUPDEF_SETHI(pgdir_size)
35 BTFIXUPDEF_SETHI(pgdir_mask)
36
37 BTFIXUPDEF_SIMM13(ptrs_per_pmd)
38 BTFIXUPDEF_SIMM13(ptrs_per_pgd)
39 BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
40
41 #define pte_ERROR(e) __builtin_trap()
42 #define pmd_ERROR(e) __builtin_trap()
43 #define pgd_ERROR(e) __builtin_trap()
44
45 BTFIXUPDEF_INT(page_none)
46 BTFIXUPDEF_INT(page_copy)
47 BTFIXUPDEF_INT(page_readonly)
48 BTFIXUPDEF_INT(page_kernel)
49
50 #define PMD_SHIFT SUN4C_PMD_SHIFT
51 #define PMD_SIZE (1UL << PMD_SHIFT)
52 #define PMD_MASK (~(PMD_SIZE-1))
53 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
54 #define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
55 #define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
56 #define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
57 #define PTRS_PER_PTE 1024
58 #define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
59 #define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
60 #define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
61 #define FIRST_USER_ADDRESS 0
62 #define PTE_SIZE (PTRS_PER_PTE*4)
63
64 #define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
65 extern pgprot_t PAGE_SHARED;
66 #define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
67 #define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
68
69 extern unsigned long page_kernel;
70
71 #ifdef MODULE
72 #define PAGE_KERNEL page_kernel
73 #else
74 #define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
75 #endif
76
77 /* Top-level page directory */
78 extern pgd_t swapper_pg_dir[1024];
79
80 extern void paging_init(void);
81
82 /* Page table for 0-4MB for everybody, on the Sparc this
83 * holds the same as on the i386.
84 */
85 extern pte_t pg0[1024];
86 extern pte_t pg1[1024];
87 extern pte_t pg2[1024];
88 extern pte_t pg3[1024];
89
90 extern unsigned long ptr_in_current_pgd;
91
92 /* Here is a trick, since mmap.c need the initializer elements for
93 * protection_map[] to be constant at compile time, I set the following
94 * to all zeros. I set it to the real values after I link in the
95 * appropriate MMU page table routines at boot time.
96 */
97 #define __P000 __pgprot(0)
98 #define __P001 __pgprot(0)
99 #define __P010 __pgprot(0)
100 #define __P011 __pgprot(0)
101 #define __P100 __pgprot(0)
102 #define __P101 __pgprot(0)
103 #define __P110 __pgprot(0)
104 #define __P111 __pgprot(0)
105
106 #define __S000 __pgprot(0)
107 #define __S001 __pgprot(0)
108 #define __S010 __pgprot(0)
109 #define __S011 __pgprot(0)
110 #define __S100 __pgprot(0)
111 #define __S101 __pgprot(0)
112 #define __S110 __pgprot(0)
113 #define __S111 __pgprot(0)
114
115 extern int num_contexts;
116
117 /* First physical page can be anywhere, the following is needed so that
118 * va-->pa and vice versa conversions work properly without performance
119 * hit for all __pa()/__va() operations.
120 */
121 extern unsigned long phys_base;
122 extern unsigned long pfn_base;
123
124 /*
125 * BAD_PAGETABLE is used when we need a bogus page-table, while
126 * BAD_PAGE is used for a bogus page.
127 *
128 * ZERO_PAGE is a global shared page that is always zero: used
129 * for zero-mapped memory areas etc..
130 */
131 extern pte_t * __bad_pagetable(void);
132 extern pte_t __bad_page(void);
133 extern unsigned long empty_zero_page;
134
135 #define BAD_PAGETABLE __bad_pagetable()
136 #define BAD_PAGE __bad_page()
137 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
138
139 /*
140 */
BTFIXUPDEF_CALL_CONST(struct page *,pmd_page,pmd_t)141 BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
142 BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
143
144 #define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
145 #define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
146
147 BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
148 BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
149
150 static inline int pte_none(pte_t pte)
151 {
152 return !pte_val(pte);
153 }
154
155 #define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
156 #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_bad, pmd_t)
159 BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
160 BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
161
162 static inline int pmd_none(pmd_t pmd)
163 {
164 return !pmd_val(pmd);
165 }
166
167 #define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
168 #define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
169 #define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
170
171 BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
172 BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
173 BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
174 BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
175
176 #define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
177 #define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
178 #define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
179 #define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
180
181 /*
182 * The following only work if pte_present() is true.
183 * Undefined behaviour if not..
184 */
185 BTFIXUPDEF_HALF(pte_writei)
186 BTFIXUPDEF_HALF(pte_dirtyi)
187 BTFIXUPDEF_HALF(pte_youngi)
188
189 static int pte_write(pte_t pte) __attribute_const__;
pte_write(pte_t pte)190 static inline int pte_write(pte_t pte)
191 {
192 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
193 }
194
195 static int pte_dirty(pte_t pte) __attribute_const__;
pte_dirty(pte_t pte)196 static inline int pte_dirty(pte_t pte)
197 {
198 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
199 }
200
201 static int pte_young(pte_t pte) __attribute_const__;
pte_young(pte_t pte)202 static inline int pte_young(pte_t pte)
203 {
204 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
205 }
206
207 /*
208 * The following only work if pte_present() is not true.
209 */
210 BTFIXUPDEF_HALF(pte_filei)
211
212 static int pte_file(pte_t pte) __attribute_const__;
pte_file(pte_t pte)213 static inline int pte_file(pte_t pte)
214 {
215 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
216 }
217
pte_special(pte_t pte)218 static inline int pte_special(pte_t pte)
219 {
220 return 0;
221 }
222
223 /*
224 */
225 BTFIXUPDEF_HALF(pte_wrprotecti)
226 BTFIXUPDEF_HALF(pte_mkcleani)
227 BTFIXUPDEF_HALF(pte_mkoldi)
228
229 static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
pte_wrprotect(pte_t pte)230 static inline pte_t pte_wrprotect(pte_t pte)
231 {
232 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
233 }
234
235 static pte_t pte_mkclean(pte_t pte) __attribute_const__;
pte_mkclean(pte_t pte)236 static inline pte_t pte_mkclean(pte_t pte)
237 {
238 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
239 }
240
241 static pte_t pte_mkold(pte_t pte) __attribute_const__;
pte_mkold(pte_t pte)242 static inline pte_t pte_mkold(pte_t pte)
243 {
244 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
245 }
246
247 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
248 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
249 BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
250
251 #define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
252 #define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
253 #define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
254
255 #define pte_mkspecial(pte) (pte)
256
257 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
258
259 BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
260 #define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
261 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
262
263 /*
264 * Conversion functions: convert a page and protection to a page entry,
265 * and a page entry and page directory to the page they refer to.
266 */
267 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
268
269 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
270 BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
271 BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
272
273 #define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
274 #define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
275 #define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
276
277 #define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
278
279 BTFIXUPDEF_INT(pte_modify_mask)
280
281 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
pte_modify(pte_t pte,pgprot_t newprot)282 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
283 {
284 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
285 pgprot_val(newprot));
286 }
287
288 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
289
290 /* to find an entry in a page-table-directory */
291 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
292
293 /* to find an entry in a kernel page-table-directory */
294 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
295
296 /* Find an entry in the second-level page table.. */
297 BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
298 #define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
299
300 /* Find an entry in the third-level page table.. */
301 BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
302 #define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
303
304 /*
305 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
306 * and sun4c is guaranteed to have no highmem anyway.
307 */
308 #define pte_offset_map(d, a) pte_offset_kernel(d,a)
309 #define pte_unmap(pte) do{}while(0)
310
311 /* Certain architectures need to do special things when pte's
312 * within a page table are directly modified. Thus, the following
313 * hook is made available.
314 */
315
316 BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
317
318 #define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
319 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
320
321 struct seq_file;
322 BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
323
324 #define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
325
326 /* Fault handler stuff... */
327 #define FAULT_CODE_PROT 0x1
328 #define FAULT_CODE_WRITE 0x2
329 #define FAULT_CODE_USER 0x4
330
331 BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
332
333 #define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
334
335 BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
336 unsigned long, unsigned int)
337 BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
338 #define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
339 #define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
340
341 extern int invalid_segment;
342
343 /* Encode and de-code a swap entry */
344 BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
345 BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
346 BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
347
348 #define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
349 #define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
350 #define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
351
352 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
353 #define __swp_entry_to_pte(x) ((pte_t) { (x).val })
354
355 /* file-offset-in-pte helpers */
356 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
357 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
358
359 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
360 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
361
362 /*
363 * This is made a constant because mm/fremap.c required a constant.
364 * Note that layout of these bits is different between sun4c.c and srmmu.c.
365 */
366 #define PTE_FILE_MAX_BITS 24
367
368 /*
369 */
370 struct ctx_list {
371 struct ctx_list *next;
372 struct ctx_list *prev;
373 unsigned int ctx_number;
374 struct mm_struct *ctx_mm;
375 };
376
377 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
378 extern struct ctx_list ctx_free; /* Head of free list */
379 extern struct ctx_list ctx_used; /* Head of used contexts list */
380
381 #define NO_CONTEXT -1
382
remove_from_ctx_list(struct ctx_list * entry)383 static inline void remove_from_ctx_list(struct ctx_list *entry)
384 {
385 entry->next->prev = entry->prev;
386 entry->prev->next = entry->next;
387 }
388
add_to_ctx_list(struct ctx_list * head,struct ctx_list * entry)389 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
390 {
391 entry->next = head;
392 (entry->prev = head->prev)->next = entry;
393 head->prev = entry;
394 }
395 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
396 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
397
398 static inline unsigned long
__get_phys(unsigned long addr)399 __get_phys (unsigned long addr)
400 {
401 switch (sparc_cpu_model){
402 case sun4:
403 case sun4c:
404 return sun4c_get_pte (addr) << PAGE_SHIFT;
405 case sun4m:
406 case sun4d:
407 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
408 default:
409 return 0;
410 }
411 }
412
413 static inline int
__get_iospace(unsigned long addr)414 __get_iospace (unsigned long addr)
415 {
416 switch (sparc_cpu_model){
417 case sun4:
418 case sun4c:
419 return -1; /* Don't check iospace on sun4c */
420 case sun4m:
421 case sun4d:
422 return (srmmu_get_pte (addr) >> 28);
423 default:
424 return -1;
425 }
426 }
427
428 extern unsigned long *sparc_valid_addr_bitmap;
429
430 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
431 #define kern_addr_valid(addr) \
432 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
433
434 /*
435 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
436 * its high 4 bits. These macros/functions put it there or get it from there.
437 */
438 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
439 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
440 #define GET_PFN(pfn) (pfn & 0x0fffffffUL)
441
442 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long,
443 unsigned long, pgprot_t);
444
io_remap_pfn_range(struct vm_area_struct * vma,unsigned long from,unsigned long pfn,unsigned long size,pgprot_t prot)445 static inline int io_remap_pfn_range(struct vm_area_struct *vma,
446 unsigned long from, unsigned long pfn,
447 unsigned long size, pgprot_t prot)
448 {
449 unsigned long long offset, space, phys_base;
450
451 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT;
452 space = GET_IOSPACE(pfn);
453 phys_base = offset | (space << 32ULL);
454
455 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot);
456 }
457
458 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
459 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
460 ({ \
461 int __changed = !pte_same(*(__ptep), __entry); \
462 if (__changed) { \
463 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
464 flush_tlb_page(__vma, __address); \
465 } \
466 (sparc_cpu_model == sun4c) || __changed; \
467 })
468
469 #include <asm-generic/pgtable.h>
470
471 #endif /* !(__ASSEMBLY__) */
472
473 #define VMALLOC_START _AC(0xfe600000,UL)
474 /* XXX Alter this when I get around to fixing sun4c - Anton */
475 #define VMALLOC_END _AC(0xffc00000,UL)
476
477
478 /* We provide our own get_unmapped_area to cope with VA holes for userland */
479 #define HAVE_ARCH_UNMAPPED_AREA
480
481 /*
482 * No page table caches to initialise
483 */
484 #define pgtable_cache_init() do { } while (0)
485
486 #endif /* !(_SPARC_PGTABLE_H) */
487