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1#ifndef _SPARC_PGTABLE_H
2#define _SPARC_PGTABLE_H
3
4/* asm-sparc/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 <asm-generic/4level-fixup.h>
12
13#include <linux/spinlock.h>
14#include <linux/swap.h>
15#include <asm/types.h>
16#ifdef CONFIG_SUN4
17#include <asm/pgtsun4.h>
18#else
19#include <asm/pgtsun4c.h>
20#endif
21#include <asm/pgtsrmmu.h>
22#include <asm/vac-ops.h>
23#include <asm/oplib.h>
24#include <asm/btfixup.h>
25#include <asm/system.h>
26
27#ifndef __ASSEMBLY__
28
29struct vm_area_struct;
30struct page;
31
32extern void load_mmu(void);
33extern unsigned long calc_highpages(void);
34
35BTFIXUPDEF_SIMM13(pgdir_shift)
36BTFIXUPDEF_SETHI(pgdir_size)
37BTFIXUPDEF_SETHI(pgdir_mask)
38
39BTFIXUPDEF_SIMM13(ptrs_per_pmd)
40BTFIXUPDEF_SIMM13(ptrs_per_pgd)
41BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
42
43#define pte_ERROR(e) __builtin_trap()
44#define pmd_ERROR(e) __builtin_trap()
45#define pgd_ERROR(e) __builtin_trap()
46
47BTFIXUPDEF_INT(page_none)
48BTFIXUPDEF_INT(page_copy)
49BTFIXUPDEF_INT(page_readonly)
50BTFIXUPDEF_INT(page_kernel)
51
52#define PMD_SHIFT SUN4C_PMD_SHIFT
53#define PMD_SIZE (1UL << PMD_SHIFT)
54#define PMD_MASK (~(PMD_SIZE-1))
55#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
56#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
57#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
58#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
59#define PTRS_PER_PTE 1024
60#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
61#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
62#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
63#define FIRST_USER_ADDRESS 0
64#define PTE_SIZE (PTRS_PER_PTE*4)
65
66#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
67extern pgprot_t PAGE_SHARED;
68#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
69#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
70
71extern unsigned long page_kernel;
72
73#ifdef MODULE
74#define PAGE_KERNEL page_kernel
75#else
76#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
77#endif
78
79/* Top-level page directory */
80extern pgd_t swapper_pg_dir[1024];
81
82extern void paging_init(void);
83
84/* Page table for 0-4MB for everybody, on the Sparc this
85 * holds the same as on the i386.
86 */
87extern pte_t pg0[1024];
88extern pte_t pg1[1024];
89extern pte_t pg2[1024];
90extern pte_t pg3[1024];
91
92extern unsigned long ptr_in_current_pgd;
93
94/* Here is a trick, since mmap.c need the initializer elements for
95 * protection_map[] to be constant at compile time, I set the following
96 * to all zeros. I set it to the real values after I link in the
97 * appropriate MMU page table routines at boot time.
98 */
99#define __P000 __pgprot(0)
100#define __P001 __pgprot(0)
101#define __P010 __pgprot(0)
102#define __P011 __pgprot(0)
103#define __P100 __pgprot(0)
104#define __P101 __pgprot(0)
105#define __P110 __pgprot(0)
106#define __P111 __pgprot(0)
107
108#define __S000 __pgprot(0)
109#define __S001 __pgprot(0)
110#define __S010 __pgprot(0)
111#define __S011 __pgprot(0)
112#define __S100 __pgprot(0)
113#define __S101 __pgprot(0)
114#define __S110 __pgprot(0)
115#define __S111 __pgprot(0)
116
117extern int num_contexts;
118
119/* First physical page can be anywhere, the following is needed so that
120 * va-->pa and vice versa conversions work properly without performance
121 * hit for all __pa()/__va() operations.
122 */
123extern unsigned long phys_base;
124extern unsigned long pfn_base;
125
126/*
127 * BAD_PAGETABLE is used when we need a bogus page-table, while
128 * BAD_PAGE is used for a bogus page.
129 *
130 * ZERO_PAGE is a global shared page that is always zero: used
131 * for zero-mapped memory areas etc..
132 */
133extern pte_t * __bad_pagetable(void);
134extern pte_t __bad_page(void);
135extern unsigned long empty_zero_page;
136
137#define BAD_PAGETABLE __bad_pagetable()
138#define BAD_PAGE __bad_page()
139#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
140
141/*
142 */
143BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
144BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
145
146#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
147#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
148
149BTFIXUPDEF_SETHI(none_mask)
150BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
151BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
152
153static inline int pte_none(pte_t pte)
154{
155 return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
156}
157
158#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
159#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
160
161BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
162BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
163BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
164
165static inline int pmd_none(pmd_t pmd)
166{
167 return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
168}
169
170#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
171#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
172#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
173
174BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
175BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
176BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
177BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
178
179#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
180#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
181#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
182#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
183
184/*
185 * The following only work if pte_present() is true.
186 * Undefined behaviour if not..
187 */
188BTFIXUPDEF_HALF(pte_writei)
189BTFIXUPDEF_HALF(pte_dirtyi)
190BTFIXUPDEF_HALF(pte_youngi)
191
192static int pte_write(pte_t pte) __attribute_const__;
193static inline int pte_write(pte_t pte)
194{
195 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
196}
197
198static int pte_dirty(pte_t pte) __attribute_const__;
199static inline int pte_dirty(pte_t pte)
200{
201 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
202}
203
204static int pte_young(pte_t pte) __attribute_const__;
205static inline int pte_young(pte_t pte)
206{
207 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
208}
209
210/*
211 * The following only work if pte_present() is not true.
212 */
213BTFIXUPDEF_HALF(pte_filei)
214
215static int pte_file(pte_t pte) __attribute_const__;
216static inline int pte_file(pte_t pte)
217{
218 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
219}
220
221static inline int pte_special(pte_t pte)
222{
223 return 0;
224}
225
226/*
227 */
228BTFIXUPDEF_HALF(pte_wrprotecti)
229BTFIXUPDEF_HALF(pte_mkcleani)
230BTFIXUPDEF_HALF(pte_mkoldi)
231
232static pte_t pte_wrprotect(pte_t pte) __attribute_const__;
233static inline pte_t pte_wrprotect(pte_t pte)
234{
235 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_wrprotecti));
236}
237
238static pte_t pte_mkclean(pte_t pte) __attribute_const__;
239static inline pte_t pte_mkclean(pte_t pte)
240{
241 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkcleani));
242}
243
244static pte_t pte_mkold(pte_t pte) __attribute_const__;
245static inline pte_t pte_mkold(pte_t pte)
246{
247 return __pte(pte_val(pte) & ~BTFIXUP_HALF(pte_mkoldi));
248}
249
250BTFIXUPDEF_CALL_CONST(pte_t, pte_mkwrite, pte_t)
251BTFIXUPDEF_CALL_CONST(pte_t, pte_mkdirty, pte_t)
252BTFIXUPDEF_CALL_CONST(pte_t, pte_mkyoung, pte_t)
253
254#define pte_mkwrite(pte) BTFIXUP_CALL(pte_mkwrite)(pte)
255#define pte_mkdirty(pte) BTFIXUP_CALL(pte_mkdirty)(pte)
256#define pte_mkyoung(pte) BTFIXUP_CALL(pte_mkyoung)(pte)
257
258#define pte_mkspecial(pte) (pte)
259
260#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
261
262BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
263#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
264#define pte_page(pte) pfn_to_page(pte_pfn(pte))
265
266/*
267 * Conversion functions: convert a page and protection to a page entry,
268 * and a page entry and page directory to the page they refer to.
269 */
270BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
271
272BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
273BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
274BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
275
276#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
277#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
278#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
279
280#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
281
282BTFIXUPDEF_INT(pte_modify_mask)
283
284static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
285static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
286{
287 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
288 pgprot_val(newprot));
289}
290
291#define pgd_index(address) ((address) >> PGDIR_SHIFT)
292
293/* to find an entry in a page-table-directory */
294#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
295
296/* to find an entry in a kernel page-table-directory */
297#define pgd_offset_k(address) pgd_offset(&init_mm, address)
298
299/* Find an entry in the second-level page table.. */
300BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
301#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
302
303/* Find an entry in the third-level page table.. */
304BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
305#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
306
307/*
308 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
309 * and sun4c is guaranteed to have no highmem anyway.
310 */
311#define pte_offset_map(d, a) pte_offset_kernel(d,a)
312#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
313
314#define pte_unmap(pte) do{}while(0)
315#define pte_unmap_nested(pte) do{}while(0)
316
317/* Certain architectures need to do special things when pte's
318 * within a page table are directly modified. Thus, the following
319 * hook is made available.
320 */
321
322BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
323
324#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
325#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
326
327struct seq_file;
328BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
329
330#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
331
332/* Fault handler stuff... */
333#define FAULT_CODE_PROT 0x1
334#define FAULT_CODE_WRITE 0x2
335#define FAULT_CODE_USER 0x4
336
337BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t)
338
339#define update_mmu_cache(vma,addr,pte) BTFIXUP_CALL(update_mmu_cache)(vma,addr,pte)
340
341BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
342 unsigned long, unsigned int)
343BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
344#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
345#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
346
347extern int invalid_segment;
348
349/* Encode and de-code a swap entry */
350BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
351BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
352BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
353
354#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
355#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
356#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
357
358#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
359#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
360
361/* file-offset-in-pte helpers */
362BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
363BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
364
365#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
366#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
367
368/*
369 * This is made a constant because mm/fremap.c required a constant.
370 * Note that layout of these bits is different between sun4c.c and srmmu.c.
371 */
372#define PTE_FILE_MAX_BITS 24
373
374/*
375 */
376struct ctx_list {
377 struct ctx_list *next;
378 struct ctx_list *prev;
379 unsigned int ctx_number;
380 struct mm_struct *ctx_mm;
381};
382
383extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
384extern struct ctx_list ctx_free; /* Head of free list */
385extern struct ctx_list ctx_used; /* Head of used contexts list */
386
387#define NO_CONTEXT -1
388
389static inline void remove_from_ctx_list(struct ctx_list *entry)
390{
391 entry->next->prev = entry->prev;
392 entry->prev->next = entry->next;
393}
394
395static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
396{
397 entry->next = head;
398 (entry->prev = head->prev)->next = entry;
399 head->prev = entry;
400}
401#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
402#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
403
404static inline unsigned long
405__get_phys (unsigned long addr)
406{
407 switch (sparc_cpu_model){
408 case sun4:
409 case sun4c:
410 return sun4c_get_pte (addr) << PAGE_SHIFT;
411 case sun4m:
412 case sun4d:
413 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
414 default:
415 return 0;
416 }
417}
418
419static inline int
420__get_iospace (unsigned long addr)
421{
422 switch (sparc_cpu_model){
423 case sun4:
424 case sun4c:
425 return -1; /* Don't check iospace on sun4c */
426 case sun4m:
427 case sun4d:
428 return (srmmu_get_pte (addr) >> 28);
429 default:
430 return -1;
431 }
432}
433
434extern unsigned long *sparc_valid_addr_bitmap;
435
436/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
437#define kern_addr_valid(addr) \
438 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
439
440extern int io_remap_pfn_range(struct vm_area_struct *vma,
441 unsigned long from, unsigned long pfn,
442 unsigned long size, pgprot_t prot);
443
444/*
445 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
446 * its high 4 bits. These macros/functions put it there or get it from there.
447 */
448#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
449#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
450#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
451
452#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
453#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
454({ \
455 int __changed = !pte_same(*(__ptep), __entry); \
456 if (__changed) { \
457 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
458 flush_tlb_page(__vma, __address); \
459 } \
460 (sparc_cpu_model == sun4c) || __changed; \
461})
462
463#include <asm-generic/pgtable.h>
464
465#endif /* !(__ASSEMBLY__) */
466
467/* We provide our own get_unmapped_area to cope with VA holes for userland */
468#define HAVE_ARCH_UNMAPPED_AREA
469
470/*
471 * No page table caches to initialise
472 */
473#define pgtable_cache_init() do { } while (0)
474
475#endif /* !(_SPARC_PGTABLE_H) */