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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $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
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#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_shared)
50BTFIXUPDEF_INT(page_copy)
51BTFIXUPDEF_INT(page_readonly)
52BTFIXUPDEF_INT(page_kernel)
53
54#define PMD_SHIFT SUN4C_PMD_SHIFT
55#define PMD_SIZE (1UL << PMD_SHIFT)
56#define PMD_MASK (~(PMD_SIZE-1))
57#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
58#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
59#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
60#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
61#define PTRS_PER_PTE 1024
62#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
63#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
64#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
Hugh Dickinsd455a362005-04-19 13:29:23 -070065#define FIRST_USER_ADDRESS 0
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#define PTE_SIZE (PTRS_PER_PTE*4)
67
68#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
69#define PAGE_SHARED __pgprot(BTFIXUP_INT(page_shared))
70#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
71#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
72
73extern unsigned long page_kernel;
74
75#ifdef MODULE
76#define PAGE_KERNEL page_kernel
77#else
78#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
79#endif
80
81/* Top-level page directory */
82extern pgd_t swapper_pg_dir[1024];
83
David S. Miller801ab3c2005-09-28 21:31:25 -070084extern void paging_init(void);
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086/* Page table for 0-4MB for everybody, on the Sparc this
87 * holds the same as on the i386.
88 */
89extern pte_t pg0[1024];
90extern pte_t pg1[1024];
91extern pte_t pg2[1024];
92extern pte_t pg3[1024];
93
94extern unsigned long ptr_in_current_pgd;
95
96/* Here is a trick, since mmap.c need the initializer elements for
97 * protection_map[] to be constant at compile time, I set the following
98 * to all zeros. I set it to the real values after I link in the
99 * appropriate MMU page table routines at boot time.
100 */
101#define __P000 __pgprot(0)
102#define __P001 __pgprot(0)
103#define __P010 __pgprot(0)
104#define __P011 __pgprot(0)
105#define __P100 __pgprot(0)
106#define __P101 __pgprot(0)
107#define __P110 __pgprot(0)
108#define __P111 __pgprot(0)
109
110#define __S000 __pgprot(0)
111#define __S001 __pgprot(0)
112#define __S010 __pgprot(0)
113#define __S011 __pgprot(0)
114#define __S100 __pgprot(0)
115#define __S101 __pgprot(0)
116#define __S110 __pgprot(0)
117#define __S111 __pgprot(0)
118
119extern int num_contexts;
120
121/* First physical page can be anywhere, the following is needed so that
122 * va-->pa and vice versa conversions work properly without performance
123 * hit for all __pa()/__va() operations.
124 */
125extern unsigned long phys_base;
126extern unsigned long pfn_base;
127
128/*
129 * BAD_PAGETABLE is used when we need a bogus page-table, while
130 * BAD_PAGE is used for a bogus page.
131 *
132 * ZERO_PAGE is a global shared page that is always zero: used
133 * for zero-mapped memory areas etc..
134 */
135extern pte_t * __bad_pagetable(void);
136extern pte_t __bad_page(void);
137extern unsigned long empty_zero_page;
138
139#define BAD_PAGETABLE __bad_pagetable()
140#define BAD_PAGE __bad_page()
141#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
142
143/*
144 */
145BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
146BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page, pgd_t)
147
148#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
149#define pgd_page(pgd) BTFIXUP_CALL(pgd_page)(pgd)
150
151BTFIXUPDEF_SETHI(none_mask)
152BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
153BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
154BTFIXUPDEF_CALL(int, pte_read, pte_t)
155
Adrian Bunk31156242005-10-03 17:37:02 -0700156static inline int pte_none(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
158 return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
159}
160
161#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
162#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
163#define pte_read(pte) BTFIXUP_CALL(pte_read)(pte)
164
165BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
166BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
167BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
168
Adrian Bunk31156242005-10-03 17:37:02 -0700169static inline int pmd_none(pmd_t pmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
172}
173
174#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
175#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
176#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
177
178BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
179BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
180BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
181BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
182
183#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
184#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
185#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
186#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
187
188/*
189 * The following only work if pte_present() is true.
190 * Undefined behaviour if not..
191 */
192BTFIXUPDEF_HALF(pte_writei)
193BTFIXUPDEF_HALF(pte_dirtyi)
194BTFIXUPDEF_HALF(pte_youngi)
195
Al Viro329d4dd2005-10-05 08:36:02 +0100196static int pte_write(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700197static inline int pte_write(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
200}
201
Al Viro329d4dd2005-10-05 08:36:02 +0100202static int pte_dirty(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700203static inline int pte_dirty(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
206}
207
Al Viro329d4dd2005-10-05 08:36:02 +0100208static int pte_young(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700209static inline int pte_young(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
211 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
212}
213
214/*
215 * The following only work if pte_present() is not true.
216 */
217BTFIXUPDEF_HALF(pte_filei)
218
Al Viro329d4dd2005-10-05 08:36:02 +0100219static int pte_file(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700220static inline int pte_file(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221{
222 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
223}
224
225/*
226 */
227BTFIXUPDEF_HALF(pte_wrprotecti)
228BTFIXUPDEF_HALF(pte_mkcleani)
229BTFIXUPDEF_HALF(pte_mkoldi)
230
Al Viro329d4dd2005-10-05 08:36:02 +0100231static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700232static inline pte_t pte_wrprotect(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
234 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
235}
236
Al Viro329d4dd2005-10-05 08:36:02 +0100237static pte_t pte_mkclean(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700238static inline pte_t pte_mkclean(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239{
240 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
241}
242
Al Viro329d4dd2005-10-05 08:36:02 +0100243static pte_t pte_mkold(pte_t pte) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700244static inline pte_t pte_mkold(pte_t pte)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245{
246 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
247}
248
249BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
250BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
251BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
252
253#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
254#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
255#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
258
259BTFIXUPDEF_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 */
267BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
268
269BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
270BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
David S. Miller14778d92006-03-21 02:29:39 -0800271BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
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
David S. Miller14778d92006-03-21 02:29:39 -0800277#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279BTFIXUPDEF_INT(pte_modify_mask)
280
Al Viro329d4dd2005-10-05 08:36:02 +0100281static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
Adrian Bunk31156242005-10-03 17:37:02 -0700282static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
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.. */
297BTFIXUPDEF_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.. */
301BTFIXUPDEF_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_offset_map_nested(d, a) pte_offset_kernel(d,a)
310
311#define pte_unmap(pte) do{}while(0)
312#define pte_unmap_nested(pte) do{}while(0)
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314/* 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.
317 */
318
319BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
320
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)
323
324struct seq_file;
325BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
326
327#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
328
329/* Fault handler stuff... */
330#define FAULT_CODE_PROT 0x1
331#define FAULT_CODE_WRITE 0x2
332#define FAULT_CODE_USER 0x4
333
334BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
335
336#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
337
338BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
339 unsigned long, unsigned int)
340BTFIXUPDEF_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)
343
344extern int invalid_segment;
345
346/* Encode and de-code a swap entry */
347BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
348BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
349BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
350
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)
354
355#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
356#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
357
358/* file-offset-in-pte helpers */
359BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
360BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
361
362#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
363#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
364
365/*
366 * This is made a constant because mm/fremap.c required a constant.
367 * Note that layout of these bits is different between sun4c.c and srmmu.c.
368 */
369#define PTE_FILE_MAX_BITS 24
370
371/*
372 */
373struct ctx_list {
374 struct ctx_list *next;
375 struct ctx_list *prev;
376 unsigned int ctx_number;
377 struct mm_struct *ctx_mm;
378};
379
380extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
381extern struct ctx_list ctx_free; /* Head of free list */
382extern struct ctx_list ctx_used; /* Head of used contexts list */
383
384#define NO_CONTEXT -1
385
Adrian Bunk31156242005-10-03 17:37:02 -0700386static inline void remove_from_ctx_list(struct ctx_list *entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 entry->next->prev = entry->prev;
389 entry->prev->next = entry->next;
390}
391
Adrian Bunk31156242005-10-03 17:37:02 -0700392static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
394 entry->next = head;
395 (entry->prev = head->prev)->next = entry;
396 head->prev = entry;
397}
398#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
399#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
400
Adrian Bunk31156242005-10-03 17:37:02 -0700401static inline unsigned long
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402__get_phys (unsigned long addr)
403{
404 switch (sparc_cpu_model){
405 case sun4:
406 case sun4c:
407 return sun4c_get_pte (addr) << PAGE_SHIFT;
408 case sun4m:
409 case sun4d:
410 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
411 default:
412 return 0;
413 }
414}
415
Adrian Bunk31156242005-10-03 17:37:02 -0700416static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417__get_iospace (unsigned long addr)
418{
419 switch (sparc_cpu_model){
420 case sun4:
421 case sun4c:
422 return -1; /* Don't check iospace on sun4c */
423 case sun4m:
424 case sun4d:
425 return (srmmu_get_pte (addr) >> 28);
426 default:
427 return -1;
428 }
429}
430
431extern unsigned long *sparc_valid_addr_bitmap;
432
433/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
434#define kern_addr_valid(addr) \
435 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437extern int io_remap_pfn_range(struct vm_area_struct *vma,
438 unsigned long from, unsigned long pfn,
439 unsigned long size, pgprot_t prot);
440
441/*
442 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
443 * its high 4 bits. These macros/functions put it there or get it from there.
444 */
445#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
446#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
447#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
448
449#include <asm-generic/pgtable.h>
450
451#endif /* !(__ASSEMBLY__) */
452
453/* We provide our own get_unmapped_area to cope with VA holes for userland */
454#define HAVE_ARCH_UNMAPPED_AREA
455
456/*
457 * No page table caches to initialise
458 */
459#define pgtable_cache_init() do { } while (0)
460
461#endif /* !(_SPARC_PGTABLE_H) */