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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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#ifndef __ASSEMBLY__
12#include <asm-generic/4level-fixup.h>
13
14#include <linux/spinlock.h>
15#include <linux/swap.h>
16#include <asm/types.h>
17#include <asm/pgtsun4c.h>
18#include <asm/pgtsrmmu.h>
19#include <asm/vac-ops.h>
20#include <asm/oplib.h>
21#include <asm/btfixup.h>
22#include <asm/system.h>
23
24
25struct vm_area_struct;
26struct page;
27
28extern void load_mmu(void);
29extern unsigned long calc_highpages(void);
30
31BTFIXUPDEF_SIMM13(pgdir_shift)
32BTFIXUPDEF_SETHI(pgdir_size)
33BTFIXUPDEF_SETHI(pgdir_mask)
34
35BTFIXUPDEF_SIMM13(ptrs_per_pmd)
36BTFIXUPDEF_SIMM13(ptrs_per_pgd)
37BTFIXUPDEF_SIMM13(user_ptrs_per_pgd)
38
39#define pte_ERROR(e) __builtin_trap()
40#define pmd_ERROR(e) __builtin_trap()
41#define pgd_ERROR(e) __builtin_trap()
42
43BTFIXUPDEF_INT(page_none)
44BTFIXUPDEF_INT(page_copy)
45BTFIXUPDEF_INT(page_readonly)
46BTFIXUPDEF_INT(page_kernel)
47
48#define PMD_SHIFT SUN4C_PMD_SHIFT
49#define PMD_SIZE (1UL << PMD_SHIFT)
50#define PMD_MASK (~(PMD_SIZE-1))
51#define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK)
52#define PGDIR_SHIFT BTFIXUP_SIMM13(pgdir_shift)
53#define PGDIR_SIZE BTFIXUP_SETHI(pgdir_size)
54#define PGDIR_MASK BTFIXUP_SETHI(pgdir_mask)
55#define PTRS_PER_PTE 1024
56#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
57#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
58#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
59#define FIRST_USER_ADDRESS 0
60#define PTE_SIZE (PTRS_PER_PTE*4)
61
62#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
63extern pgprot_t PAGE_SHARED;
64#define PAGE_COPY __pgprot(BTFIXUP_INT(page_copy))
65#define PAGE_READONLY __pgprot(BTFIXUP_INT(page_readonly))
66
67extern unsigned long page_kernel;
68
69#ifdef MODULE
70#define PAGE_KERNEL page_kernel
71#else
72#define PAGE_KERNEL __pgprot(BTFIXUP_INT(page_kernel))
73#endif
74
75/* Top-level page directory */
76extern pgd_t swapper_pg_dir[1024];
77
78extern void paging_init(void);
79
80/* Page table for 0-4MB for everybody, on the Sparc this
81 * holds the same as on the i386.
82 */
83extern pte_t pg0[1024];
84extern pte_t pg1[1024];
85extern pte_t pg2[1024];
86extern pte_t pg3[1024];
87
88extern unsigned long ptr_in_current_pgd;
89
90/* Here is a trick, since mmap.c need the initializer elements for
91 * protection_map[] to be constant at compile time, I set the following
92 * to all zeros. I set it to the real values after I link in the
93 * appropriate MMU page table routines at boot time.
94 */
95#define __P000 __pgprot(0)
96#define __P001 __pgprot(0)
97#define __P010 __pgprot(0)
98#define __P011 __pgprot(0)
99#define __P100 __pgprot(0)
100#define __P101 __pgprot(0)
101#define __P110 __pgprot(0)
102#define __P111 __pgprot(0)
103
104#define __S000 __pgprot(0)
105#define __S001 __pgprot(0)
106#define __S010 __pgprot(0)
107#define __S011 __pgprot(0)
108#define __S100 __pgprot(0)
109#define __S101 __pgprot(0)
110#define __S110 __pgprot(0)
111#define __S111 __pgprot(0)
112
113extern int num_contexts;
114
115/* First physical page can be anywhere, the following is needed so that
116 * va-->pa and vice versa conversions work properly without performance
117 * hit for all __pa()/__va() operations.
118 */
119extern unsigned long phys_base;
120extern unsigned long pfn_base;
121
122/*
123 * BAD_PAGETABLE is used when we need a bogus page-table, while
124 * BAD_PAGE is used for a bogus page.
125 *
126 * ZERO_PAGE is a global shared page that is always zero: used
127 * for zero-mapped memory areas etc..
128 */
129extern pte_t * __bad_pagetable(void);
130extern pte_t __bad_page(void);
131extern unsigned long empty_zero_page;
132
133#define BAD_PAGETABLE __bad_pagetable()
134#define BAD_PAGE __bad_page()
135#define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page))
136
137/*
138 */
139BTFIXUPDEF_CALL_CONST(struct page *, pmd_page, pmd_t)
140BTFIXUPDEF_CALL_CONST(unsigned long, pgd_page_vaddr, pgd_t)
141
142#define pmd_page(pmd) BTFIXUP_CALL(pmd_page)(pmd)
143#define pgd_page_vaddr(pgd) BTFIXUP_CALL(pgd_page_vaddr)(pgd)
144
145BTFIXUPDEF_SETHI(none_mask)
146BTFIXUPDEF_CALL_CONST(int, pte_present, pte_t)
147BTFIXUPDEF_CALL(void, pte_clear, pte_t *)
148
149static inline int pte_none(pte_t pte)
150{
151 return !(pte_val(pte) & ~BTFIXUP_SETHI(none_mask));
152}
153
154#define pte_present(pte) BTFIXUP_CALL(pte_present)(pte)
155#define pte_clear(mm,addr,pte) BTFIXUP_CALL(pte_clear)(pte)
156
157BTFIXUPDEF_CALL_CONST(int, pmd_bad, pmd_t)
158BTFIXUPDEF_CALL_CONST(int, pmd_present, pmd_t)
159BTFIXUPDEF_CALL(void, pmd_clear, pmd_t *)
160
161static inline int pmd_none(pmd_t pmd)
162{
163 return !(pmd_val(pmd) & ~BTFIXUP_SETHI(none_mask));
164}
165
166#define pmd_bad(pmd) BTFIXUP_CALL(pmd_bad)(pmd)
167#define pmd_present(pmd) BTFIXUP_CALL(pmd_present)(pmd)
168#define pmd_clear(pmd) BTFIXUP_CALL(pmd_clear)(pmd)
169
170BTFIXUPDEF_CALL_CONST(int, pgd_none, pgd_t)
171BTFIXUPDEF_CALL_CONST(int, pgd_bad, pgd_t)
172BTFIXUPDEF_CALL_CONST(int, pgd_present, pgd_t)
173BTFIXUPDEF_CALL(void, pgd_clear, pgd_t *)
174
175#define pgd_none(pgd) BTFIXUP_CALL(pgd_none)(pgd)
176#define pgd_bad(pgd) BTFIXUP_CALL(pgd_bad)(pgd)
177#define pgd_present(pgd) BTFIXUP_CALL(pgd_present)(pgd)
178#define pgd_clear(pgd) BTFIXUP_CALL(pgd_clear)(pgd)
179
180/*
181 * The following only work if pte_present() is true.
182 * Undefined behaviour if not..
183 */
184BTFIXUPDEF_HALF(pte_writei)
185BTFIXUPDEF_HALF(pte_dirtyi)
186BTFIXUPDEF_HALF(pte_youngi)
187
188static int pte_write(pte_t pte) __attribute_const__;
189static inline int pte_write(pte_t pte)
190{
191 return pte_val(pte) & BTFIXUP_HALF(pte_writei);
192}
193
194static int pte_dirty(pte_t pte) __attribute_const__;
195static inline int pte_dirty(pte_t pte)
196{
197 return pte_val(pte) & BTFIXUP_HALF(pte_dirtyi);
198}
199
200static int pte_young(pte_t pte) __attribute_const__;
201static inline int pte_young(pte_t pte)
202{
203 return pte_val(pte) & BTFIXUP_HALF(pte_youngi);
204}
205
206/*
207 * The following only work if pte_present() is not true.
208 */
209BTFIXUPDEF_HALF(pte_filei)
210
211static int pte_file(pte_t pte) __attribute_const__;
212static inline int pte_file(pte_t pte)
213{
214 return pte_val(pte) & BTFIXUP_HALF(pte_filei);
215}
216
217static inline int pte_special(pte_t pte)
218{
219 return 0;
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 pte_mkspecial(pte) (pte)
255
256#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)
257
258BTFIXUPDEF_CALL(unsigned long, pte_pfn, pte_t)
259#define pte_pfn(pte) BTFIXUP_CALL(pte_pfn)(pte)
260#define pte_page(pte) pfn_to_page(pte_pfn(pte))
261
262/*
263 * Conversion functions: convert a page and protection to a page entry,
264 * and a page entry and page directory to the page they refer to.
265 */
266BTFIXUPDEF_CALL_CONST(pte_t, mk_pte, struct page *, pgprot_t)
267
268BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_phys, unsigned long, pgprot_t)
269BTFIXUPDEF_CALL_CONST(pte_t, mk_pte_io, unsigned long, pgprot_t, int)
270BTFIXUPDEF_CALL_CONST(pgprot_t, pgprot_noncached, pgprot_t)
271
272#define mk_pte(page,pgprot) BTFIXUP_CALL(mk_pte)(page,pgprot)
273#define mk_pte_phys(page,pgprot) BTFIXUP_CALL(mk_pte_phys)(page,pgprot)
274#define mk_pte_io(page,pgprot,space) BTFIXUP_CALL(mk_pte_io)(page,pgprot,space)
275
276#define pgprot_noncached(pgprot) BTFIXUP_CALL(pgprot_noncached)(pgprot)
277
278BTFIXUPDEF_INT(pte_modify_mask)
279
280static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__;
281static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
282{
283 return __pte((pte_val(pte) & BTFIXUP_INT(pte_modify_mask)) |
284 pgprot_val(newprot));
285}
286
287#define pgd_index(address) ((address) >> PGDIR_SHIFT)
288
289/* to find an entry in a page-table-directory */
290#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
291
292/* to find an entry in a kernel page-table-directory */
293#define pgd_offset_k(address) pgd_offset(&init_mm, address)
294
295/* Find an entry in the second-level page table.. */
296BTFIXUPDEF_CALL(pmd_t *, pmd_offset, pgd_t *, unsigned long)
297#define pmd_offset(dir,addr) BTFIXUP_CALL(pmd_offset)(dir,addr)
298
299/* Find an entry in the third-level page table.. */
300BTFIXUPDEF_CALL(pte_t *, pte_offset_kernel, pmd_t *, unsigned long)
301#define pte_offset_kernel(dir,addr) BTFIXUP_CALL(pte_offset_kernel)(dir,addr)
302
303/*
304 * This shortcut works on sun4m (and sun4d) because the nocache area is static,
305 * and sun4c is guaranteed to have no highmem anyway.
306 */
307#define pte_offset_map(d, a) pte_offset_kernel(d,a)
308#define pte_offset_map_nested(d, a) pte_offset_kernel(d,a)
309
310#define pte_unmap(pte) do{}while(0)
311#define pte_unmap_nested(pte) do{}while(0)
312
313/* Certain architectures need to do special things when pte's
314 * within a page table are directly modified. Thus, the following
315 * hook is made available.
316 */
317
318BTFIXUPDEF_CALL(void, set_pte, pte_t *, pte_t)
319
320#define set_pte(ptep,pteval) BTFIXUP_CALL(set_pte)(ptep,pteval)
321#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
322
323struct seq_file;
324BTFIXUPDEF_CALL(void, mmu_info, struct seq_file *)
325
326#define mmu_info(p) BTFIXUP_CALL(mmu_info)(p)
327
328/* Fault handler stuff... */
329#define FAULT_CODE_PROT 0x1
330#define FAULT_CODE_WRITE 0x2
331#define FAULT_CODE_USER 0x4
332
333BTFIXUPDEF_CALL(void, update_mmu_cache, struct vm_area_struct *, unsigned long, pte_t *)
334
335#define update_mmu_cache(vma,addr,ptep) BTFIXUP_CALL(update_mmu_cache)(vma,addr,ptep)
336
337BTFIXUPDEF_CALL(void, sparc_mapiorange, unsigned int, unsigned long,
338 unsigned long, unsigned int)
339BTFIXUPDEF_CALL(void, sparc_unmapiorange, unsigned long, unsigned int)
340#define sparc_mapiorange(bus,pa,va,len) BTFIXUP_CALL(sparc_mapiorange)(bus,pa,va,len)
341#define sparc_unmapiorange(va,len) BTFIXUP_CALL(sparc_unmapiorange)(va,len)
342
343extern int invalid_segment;
344
345/* Encode and de-code a swap entry */
346BTFIXUPDEF_CALL(unsigned long, __swp_type, swp_entry_t)
347BTFIXUPDEF_CALL(unsigned long, __swp_offset, swp_entry_t)
348BTFIXUPDEF_CALL(swp_entry_t, __swp_entry, unsigned long, unsigned long)
349
350#define __swp_type(__x) BTFIXUP_CALL(__swp_type)(__x)
351#define __swp_offset(__x) BTFIXUP_CALL(__swp_offset)(__x)
352#define __swp_entry(__type,__off) BTFIXUP_CALL(__swp_entry)(__type,__off)
353
354#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
355#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
356
357/* file-offset-in-pte helpers */
358BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
359BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
360
361#define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
362#define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
363
364/*
365 * This is made a constant because mm/fremap.c required a constant.
366 * Note that layout of these bits is different between sun4c.c and srmmu.c.
367 */
368#define PTE_FILE_MAX_BITS 24
369
370/*
371 */
372struct ctx_list {
373 struct ctx_list *next;
374 struct ctx_list *prev;
375 unsigned int ctx_number;
376 struct mm_struct *ctx_mm;
377};
378
379extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */
380extern struct ctx_list ctx_free; /* Head of free list */
381extern struct ctx_list ctx_used; /* Head of used contexts list */
382
383#define NO_CONTEXT -1
384
385static inline void remove_from_ctx_list(struct ctx_list *entry)
386{
387 entry->next->prev = entry->prev;
388 entry->prev->next = entry->next;
389}
390
391static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry)
392{
393 entry->next = head;
394 (entry->prev = head->prev)->next = entry;
395 head->prev = entry;
396}
397#define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry)
398#define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry)
399
400static inline unsigned long
401__get_phys (unsigned long addr)
402{
403 switch (sparc_cpu_model){
404 case sun4:
405 case sun4c:
406 return sun4c_get_pte (addr) << PAGE_SHIFT;
407 case sun4m:
408 case sun4d:
409 return ((srmmu_get_pte (addr) & 0xffffff00) << 4);
410 default:
411 return 0;
412 }
413}
414
415static inline int
416__get_iospace (unsigned long addr)
417{
418 switch (sparc_cpu_model){
419 case sun4:
420 case sun4c:
421 return -1; /* Don't check iospace on sun4c */
422 case sun4m:
423 case sun4d:
424 return (srmmu_get_pte (addr) >> 28);
425 default:
426 return -1;
427 }
428}
429
430extern unsigned long *sparc_valid_addr_bitmap;
431
432/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
433#define kern_addr_valid(addr) \
434 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap))
435
436extern int io_remap_pfn_range(struct vm_area_struct *vma,
437 unsigned long from, unsigned long pfn,
438 unsigned long size, pgprot_t prot);
439
440/*
441 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in
442 * its high 4 bits. These macros/functions put it there or get it from there.
443 */
444#define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4)))
445#define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4))
446#define GET_PFN(pfn) (pfn & 0x0fffffffUL)
447
448#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
449#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
450({ \
451 int __changed = !pte_same(*(__ptep), __entry); \
452 if (__changed) { \
453 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \
454 flush_tlb_page(__vma, __address); \
455 } \
456 (sparc_cpu_model == sun4c) || __changed; \
457})
458
459#include <asm-generic/pgtable.h>
460
461#endif /* !(__ASSEMBLY__) */
462
463#define VMALLOC_START 0xfe600000
464/* XXX Alter this when I get around to fixing sun4c - Anton */
465#define VMALLOC_END 0xffc00000
466
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) */