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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
222/*
223 */
224BTFIXUPDEF_HALF(pte_wrprotecti)
225BTFIXUPDEF_HALF(pte_mkcleani)
226BTFIXUPDEF_HALF(pte_mkoldi)
227
228static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
229static inline pte_t pte_wrprotect(pte_t pte)
230{
231 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
232}
233
234static pte_t pte_mkclean(pte_t pte) __attribute_const__;
235static inline pte_t pte_mkclean(pte_t pte)
236{
237 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
238}
239
240static pte_t pte_mkold(pte_t pte) __attribute_const__;
241static inline pte_t pte_mkold(pte_t pte)
242{
243 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
244}
245
246BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
247BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
248BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
249
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)
253
254#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
255
256BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
257#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
258#define pte_page(pte) pfn_to_page(pte_pfn(pte))
259
260/*
261 * Conversion functions: convert a page and protection to a page entry,
262 * and a page entry and page directory to the page they refer to.
263 */
264BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
265
266BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
267BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
268BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
269
270#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
271#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
272#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
273
274#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
275
276BTFIXUPDEF_INT(pte_modify_mask)
277
278static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
279static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
280{
281 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
282 pgprot_val(newprot));
283}
284
285#define pgd_index(address) ((address) >> PGDIR_SHIFT)
286
287/* to find an entry in a page-table-directory */
288#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
289
290/* to find an entry in a kernel page-table-directory */
291#define pgd_offset_k(address) pgd_offset(&init_mm, address)
292
293/* Find an entry in the second-level page table.. */
294BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
295#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
296
297/* Find an entry in the third-level page table.. */
298BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
299#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
300
301/*
302 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
303 * and sun4c is guaranteed to have no highmem anyway.
304 */
305#define pte_offset_map(d, a) pte_offset_kernel(d,a)
306#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
307
308#define pte_unmap(pte) do{}while(0)
309#define pte_unmap_nested(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
316BTFIXUPDEF_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
321struct seq_file;
322BTFIXUPDEF_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
331BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
332
333#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
334
335BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
336 unsigned long, unsigned int)
337BTFIXUPDEF_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
341extern int invalid_segment;
342
343/* Encode and de-code a swap entry */
344BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
345BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
346BTFIXUPDEF_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 */
356BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
357BTFIXUPDEF_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 */
370struct 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
377extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
378extern struct ctx_list ctx_free; /* Head of free list */
379extern struct ctx_list ctx_used; /* Head of used contexts list */
380
381#define NO_CONTEXT -1
382
383static 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
389static 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
398static inline unsigned long
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
413static inline int
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
428extern 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
434extern int io_remap_pfn_range(struct vm_area_struct *vma,
435 unsigned long from, unsigned long pfn,
436 unsigned long size, pgprot_t prot);
437
438/*
439 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
440 * its high 4 bits. These macros/functions put it there or get it from there.
441 */
442#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
443#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
444#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
445
446#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
447#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
448({ \
449 int __changed = !pte_same(*(__ptep), __entry); \
450 if (__changed) { \
451 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
452 flush_tlb_page(__vma, __address); \
453 } \
454 (sparc_cpu_model == sun4c) || __changed; \
455})
456
457#include <asm-generic/pgtable.h>
458
459#endif /* !(__ASSEMBLY__) */
460
461/* We provide our own get_unmapped_area to cope with VA holes for userland */
462#define HAVE_ARCH_UNMAPPED_AREA
463
464/*
465 * No page table caches to initialise
466 */
467#define pgtable_cache_init() do { } while (0)
468
469#endif /* !(_SPARC_PGTABLE_H) */