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-rw-r--r--include/asm-sparc/pgtable.h476
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diff --git a/include/asm-sparc/pgtable.h b/include/asm-sparc/pgtable.h
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--- a/include/asm-sparc/pgtable.h
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1/* $Id: pgtable.h,v 1.110 2001/12/21 04:56:17 davem Exp $ */
2#ifndef _SPARC_PGTABLE_H
3#define _SPARC_PGTABLE_H
4
5/* asm-sparc/pgtable.h: Defines and functions used to work
6 * with Sparc page tables.
7 *
8 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
9 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
10 */
11
12#include <asm-generic/4level-fixup.h>
13
14#include <linux/spinlock.h>
15#include <linux/swap.h>
16#include <asm/types.h>
17#ifdef CONFIG_SUN4
18#include <asm/pgtsun4.h>
19#else
20#include <asm/pgtsun4c.h>
21#endif
22#include <asm/pgtsrmmu.h>
23#include <asm/vac-ops.h>
24#include <asm/oplib.h>
25#include <asm/btfixup.h>
26#include <asm/system.h>
27
28#ifndef __ASSEMBLY__
29
30struct vm_area_struct;
31struct page;
32
33extern void load_mmu(void);
34extern unsigned long calc_highpages(void);
35
36BTFIXUPDEF_SIMM13(pgdir_shift)
37BTFIXUPDEF_SETHI(pgdir_size)
38BTFIXUPDEF_SETHI(pgdir_mask)
39
40BTFIXUPDEF_SIMM13(ptrs_per_pmd)
41BTFIXUPDEF_SIMM13(ptrs_per_pgd)
42BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
43
44#define pte_ERROR(e) __builtin_trap()
45#define pmd_ERROR(e) __builtin_trap()
46#define pgd_ERROR(e) __builtin_trap()
47
48BTFIXUPDEF_INT(page_none)
49BTFIXUPDEF_INT(page_copy)
50BTFIXUPDEF_INT(page_readonly)
51BTFIXUPDEF_INT(page_kernel)
52
53#define PMD_SHIFT SUN4C_PMD_SHIFT
54#define PMD_SIZE (1UL << PMD_SHIFT)
55#define PMD_MASK (~(PMD_SIZE-1))
56#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
57#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
58#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
59#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
60#define PTRS_PER_PTE 1024
61#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
62#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
63#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
64#define FIRST_USER_ADDRESS 0
65#define PTE_SIZE (PTRS_PER_PTE*4)
66
67#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
68extern pgprot_t PAGE_SHARED;
69#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
70#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
71
72extern unsigned long page_kernel;
73
74#ifdef MODULE
75#define PAGE_KERNEL page_kernel
76#else
77#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
78#endif
79
80/* Top-level page directory */
81extern pgd_t swapper_pg_dir[1024];
82
83extern void paging_init(void);
84
85/* Page table for 0-4MB for everybody, on the Sparc this
86 * holds the same as on the i386.
87 */
88extern pte_t pg0[1024];
89extern pte_t pg1[1024];
90extern pte_t pg2[1024];
91extern pte_t pg3[1024];
92
93extern unsigned long ptr_in_current_pgd;
94
95/* Here is a trick, since mmap.c need the initializer elements for
96 * protection_map[] to be constant at compile time, I set the following
97 * to all zeros. I set it to the real values after I link in the
98 * appropriate MMU page table routines at boot time.
99 */
100#define __P000 __pgprot(0)
101#define __P001 __pgprot(0)
102#define __P010 __pgprot(0)
103#define __P011 __pgprot(0)
104#define __P100 __pgprot(0)
105#define __P101 __pgprot(0)
106#define __P110 __pgprot(0)
107#define __P111 __pgprot(0)
108
109#define __S000 __pgprot(0)
110#define __S001 __pgprot(0)
111#define __S010 __pgprot(0)
112#define __S011 __pgprot(0)
113#define __S100 __pgprot(0)
114#define __S101 __pgprot(0)
115#define __S110 __pgprot(0)
116#define __S111 __pgprot(0)
117
118extern int num_contexts;
119
120/* First physical page can be anywhere, the following is needed so that
121 * va-->pa and vice versa conversions work properly without performance
122 * hit for all __pa()/__va() operations.
123 */
124extern unsigned long phys_base;
125extern unsigned long pfn_base;
126
127/*
128 * BAD_PAGETABLE is used when we need a bogus page-table, while
129 * BAD_PAGE is used for a bogus page.
130 *
131 * ZERO_PAGE is a global shared page that is always zero: used
132 * for zero-mapped memory areas etc..
133 */
134extern pte_t * __bad_pagetable(void);
135extern pte_t __bad_page(void);
136extern unsigned long empty_zero_page;
137
138#define BAD_PAGETABLE __bad_pagetable()
139#define BAD_PAGE __bad_page()
140#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
141
142/*
143 */
144BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
145BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
146
147#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
148#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
149
150BTFIXUPDEF_SETHI(none_mask)
151BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
152BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
153
154static inline int pte_none(pte_t pte)
155{
156 return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
157}
158
159#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
160#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
161
162BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
163BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
164BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
165
166static inline int pmd_none(pmd_t pmd)
167{
168 return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
169}
170
171#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
172#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
173#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
174
175BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
176BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
177BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
178BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
179
180#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
181#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
182#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
183#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
184
185/*
186 * The following only work if pte_present() is true.
187 * Undefined behaviour if not..
188 */
189BTFIXUPDEF_HALF(pte_writei)
190BTFIXUPDEF_HALF(pte_dirtyi)
191BTFIXUPDEF_HALF(pte_youngi)
192
193static int pte_write(pte_t pte) __attribute_const__;
194static inline int pte_write(pte_t pte)
195{
196 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
197}
198
199static int pte_dirty(pte_t pte) __attribute_const__;
200static inline int pte_dirty(pte_t pte)
201{
202 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
203}
204
205static int pte_young(pte_t pte) __attribute_const__;
206static inline int pte_young(pte_t pte)
207{
208 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
209}
210
211/*
212 * The following only work if pte_present() is not true.
213 */
214BTFIXUPDEF_HALF(pte_filei)
215
216static int pte_file(pte_t pte) __attribute_const__;
217static inline int pte_file(pte_t pte)
218{
219 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
220}
221
222static inline int pte_special(pte_t pte)
223{
224 return 0;
225}
226
227/*
228 */
229BTFIXUPDEF_HALF(pte_wrprotecti)
230BTFIXUPDEF_HALF(pte_mkcleani)
231BTFIXUPDEF_HALF(pte_mkoldi)
232
233static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
234static inline pte_t pte_wrprotect(pte_t pte)
235{
236 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
237}
238
239static pte_t pte_mkclean(pte_t pte) __attribute_const__;
240static inline pte_t pte_mkclean(pte_t pte)
241{
242 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
243}
244
245static pte_t pte_mkold(pte_t pte) __attribute_const__;
246static inline pte_t pte_mkold(pte_t pte)
247{
248 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
249}
250
251BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
252BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
253BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
254
255#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
256#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
257#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
258
259#define pte_mkspecial(pte) (pte)
260
261#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
262
263BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
264#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
265#define pte_page(pte) pfn_to_page(pte_pfn(pte))
266
267/*
268 * Conversion functions: convert a page and protection to a page entry,
269 * and a page entry and page directory to the page they refer to.
270 */
271BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
272
273BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
274BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
275BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
276
277#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
278#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
279#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
280
281#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
282
283BTFIXUPDEF_INT(pte_modify_mask)
284
285static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
286static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
287{
288 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
289 pgprot_val(newprot));
290}
291
292#define pgd_index(address) ((address) >> PGDIR_SHIFT)
293
294/* to find an entry in a page-table-directory */
295#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
296
297/* to find an entry in a kernel page-table-directory */
298#define pgd_offset_k(address) pgd_offset(&init_mm, address)
299
300/* Find an entry in the second-level page table.. */
301BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
302#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
303
304/* Find an entry in the third-level page table.. */
305BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
306#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
307
308/*
309 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
310 * and sun4c is guaranteed to have no highmem anyway.
311 */
312#define pte_offset_map(d, a) pte_offset_kernel(d,a)
313#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
314
315#define pte_unmap(pte) do{}while(0)
316#define pte_unmap_nested(pte) do{}while(0)
317
318/* Certain architectures need to do special things when pte's
319 * within a page table are directly modified. Thus, the following
320 * hook is made available.
321 */
322
323BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
324
325#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
326#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
327
328struct seq_file;
329BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
330
331#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
332
333/* Fault handler stuff... */
334#define FAULT_CODE_PROT 0x1
335#define FAULT_CODE_WRITE 0x2
336#define FAULT_CODE_USER 0x4
337
338BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
339
340#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
341
342BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
343 unsigned long, unsigned int)
344BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
345#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
346#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
347
348extern int invalid_segment;
349
350/* Encode and de-code a swap entry */
351BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
352BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
353BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
354
355#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
356#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
357#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
358
359#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
360#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
361
362/* file-offset-in-pte helpers */
363BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
364BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
365
366#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
367#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
368
369/*
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.
372 */
373#define PTE_FILE_MAX_BITS 24
374
375/*
376 */
377struct ctx_list {
378 struct ctx_list *next;
379 struct ctx_list *prev;
380 unsigned int ctx_number;
381 struct mm_struct *ctx_mm;
382};
383
384extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
385extern struct ctx_list ctx_free; /* Head of free list */
386extern struct ctx_list ctx_used; /* Head of used contexts list */
387
388#define NO_CONTEXT -1
389
390static inline void remove_from_ctx_list(struct ctx_list *entry)
391{
392 entry->next->prev = entry->prev;
393 entry->prev->next = entry->next;
394}
395
396static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
397{
398 entry->next = head;
399 (entry->prev = head->prev)->next = entry;
400 head->prev = entry;
401}
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)
404
405static inline unsigned long
406__get_phys (unsigned long addr)
407{
408 switch (sparc_cpu_model){
409 case sun4:
410 case sun4c:
411 return sun4c_get_pte (addr) << PAGE_SHIFT;
412 case sun4m:
413 case sun4d:
414 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
415 default:
416 return 0;
417 }
418}
419
420static inline int
421__get_iospace (unsigned long addr)
422{
423 switch (sparc_cpu_model){
424 case sun4:
425 case sun4c:
426 return -1; /* Don't check iospace on sun4c */
427 case sun4m:
428 case sun4d:
429 return (srmmu_get_pte (addr) >> 28);
430 default:
431 return -1;
432 }
433}
434
435extern unsigned long *sparc_valid_addr_bitmap;
436
437/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
438#define kern_addr_valid(addr) \
439 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
440
441extern int io_remap_pfn_range(struct vm_area_struct *vma,
442 unsigned long from, unsigned long pfn,
443 unsigned long size, pgprot_t prot);
444
445/*
446 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
447 * its high 4 bits. These macros/functions put it there or get it from there.
448 */
449#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
450#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
451#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
452
453#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
454#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
455({ \
456 int __changed = !pte_same(*(__ptep), __entry); \
457 if (__changed) { \
458 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
459 flush_tlb_page(__vma, __address); \
460 } \
461 (sparc_cpu_model == sun4c) || __changed; \
462})
463
464#include <asm-generic/pgtable.h>
465
466#endif /* !(__ASSEMBLY__) */
467
468/* We provide our own get_unmapped_area to cope with VA holes for userland */
469#define HAVE_ARCH_UNMAPPED_AREA
470
471/*
472 * No page table caches to initialise
473 */
474#define pgtable_cache_init() do { } while (0)
475
476#endif /* !(_SPARC_PGTABLE_H) */
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