Commit | Line | Data |
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f5e706ad SR |
1 | #ifndef _SPARC_PGTABLE_H |
2 | #define _SPARC_PGTABLE_H | |
3 | ||
a439fe51 | 4 | /* asm/pgtable.h: Defines and functions used to work |
f5e706ad SR |
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 | ||
eb485d64 SR |
11 | #include <linux/const.h> |
12 | ||
f5e706ad SR |
13 | #ifndef __ASSEMBLY__ |
14 | #include <asm-generic/4level-fixup.h> | |
15 | ||
16 | #include <linux/spinlock.h> | |
17 | #include <linux/swap.h> | |
18 | #include <asm/types.h> | |
f5e706ad | 19 | #include <asm/pgtsrmmu.h> |
9701b264 | 20 | #include <asm/vaddrs.h> |
f5e706ad | 21 | #include <asm/oplib.h> |
d550bbd4 | 22 | #include <asm/cpu_type.h> |
f5e706ad SR |
23 | |
24 | ||
25 | struct vm_area_struct; | |
26 | struct page; | |
27 | ||
28 | extern void load_mmu(void); | |
29 | extern unsigned long calc_highpages(void); | |
30 | ||
f5e706ad SR |
31 | #define pte_ERROR(e) __builtin_trap() |
32 | #define pmd_ERROR(e) __builtin_trap() | |
33 | #define pgd_ERROR(e) __builtin_trap() | |
34 | ||
1ee0e144 | 35 | #define PMD_SHIFT 22 |
f5e706ad SR |
36 | #define PMD_SIZE (1UL << PMD_SHIFT) |
37 | #define PMD_MASK (~(PMD_SIZE-1)) | |
38 | #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) | |
3d386c0e DM |
39 | #define PGDIR_SHIFT SRMMU_PGDIR_SHIFT |
40 | #define PGDIR_SIZE SRMMU_PGDIR_SIZE | |
41 | #define PGDIR_MASK SRMMU_PGDIR_MASK | |
f5e706ad | 42 | #define PTRS_PER_PTE 1024 |
3d386c0e DM |
43 | #define PTRS_PER_PMD SRMMU_PTRS_PER_PMD |
44 | #define PTRS_PER_PGD SRMMU_PTRS_PER_PGD | |
45 | #define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE | |
f5e706ad SR |
46 | #define FIRST_USER_ADDRESS 0 |
47 | #define PTE_SIZE (PTRS_PER_PTE*4) | |
48 | ||
6439d1c6 DM |
49 | #define PAGE_NONE SRMMU_PAGE_NONE |
50 | #define PAGE_SHARED SRMMU_PAGE_SHARED | |
51 | #define PAGE_COPY SRMMU_PAGE_COPY | |
52 | #define PAGE_READONLY SRMMU_PAGE_RDONLY | |
53 | #define PAGE_KERNEL SRMMU_PAGE_KERNEL | |
f5e706ad | 54 | |
881e02d2 SR |
55 | /* Top-level page directory - dummy used by init-mm. |
56 | * srmmu.c will assign the real one (which is dynamically sized) */ | |
57 | #define swapper_pg_dir NULL | |
f5e706ad SR |
58 | |
59 | extern void paging_init(void); | |
60 | ||
f5e706ad SR |
61 | extern unsigned long ptr_in_current_pgd; |
62 | ||
6439d1c6 DM |
63 | /* xwr */ |
64 | #define __P000 PAGE_NONE | |
65 | #define __P001 PAGE_READONLY | |
66 | #define __P010 PAGE_COPY | |
67 | #define __P011 PAGE_COPY | |
68 | #define __P100 PAGE_READONLY | |
69 | #define __P101 PAGE_READONLY | |
70 | #define __P110 PAGE_COPY | |
71 | #define __P111 PAGE_COPY | |
72 | ||
73 | #define __S000 PAGE_NONE | |
74 | #define __S001 PAGE_READONLY | |
75 | #define __S010 PAGE_SHARED | |
76 | #define __S011 PAGE_SHARED | |
77 | #define __S100 PAGE_READONLY | |
78 | #define __S101 PAGE_READONLY | |
79 | #define __S110 PAGE_SHARED | |
80 | #define __S111 PAGE_SHARED | |
f5e706ad | 81 | |
f5e706ad SR |
82 | /* First physical page can be anywhere, the following is needed so that |
83 | * va-->pa and vice versa conversions work properly without performance | |
84 | * hit for all __pa()/__va() operations. | |
85 | */ | |
86 | extern unsigned long phys_base; | |
87 | extern unsigned long pfn_base; | |
88 | ||
89 | /* | |
f5e706ad SR |
90 | * ZERO_PAGE is a global shared page that is always zero: used |
91 | * for zero-mapped memory areas etc.. | |
92 | */ | |
f5e706ad SR |
93 | extern unsigned long empty_zero_page; |
94 | ||
f5e706ad SR |
95 | #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) |
96 | ||
a46d6056 DM |
97 | /* |
98 | * In general all page table modifications should use the V8 atomic | |
99 | * swap instruction. This insures the mmu and the cpu are in sync | |
100 | * with respect to ref/mod bits in the page tables. | |
101 | */ | |
102 | static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) | |
103 | { | |
104 | __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr)); | |
105 | return value; | |
106 | } | |
107 | ||
62875cff DM |
108 | /* Certain architectures need to do special things when pte's |
109 | * within a page table are directly modified. Thus, the following | |
110 | * hook is made available. | |
111 | */ | |
112 | ||
113 | static inline void set_pte(pte_t *ptep, pte_t pteval) | |
a46d6056 DM |
114 | { |
115 | srmmu_swap((unsigned long *)ptep, pte_val(pteval)); | |
116 | } | |
117 | ||
62875cff DM |
118 | #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) |
119 | ||
3d827367 DM |
120 | static inline int srmmu_device_memory(unsigned long x) |
121 | { | |
122 | return ((x & 0xF0000000) != 0); | |
123 | } | |
124 | ||
125 | static inline struct page *pmd_page(pmd_t pmd) | |
126 | { | |
127 | if (srmmu_device_memory(pmd_val(pmd))) | |
128 | BUG(); | |
129 | return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); | |
130 | } | |
131 | ||
9701b264 SR |
132 | static inline unsigned long pgd_page_vaddr(pgd_t pgd) |
133 | { | |
134 | if (srmmu_device_memory(pgd_val(pgd))) { | |
135 | return ~0; | |
136 | } else { | |
137 | unsigned long v = pgd_val(pgd) & SRMMU_PTD_PMASK; | |
138 | return (unsigned long)__nocache_va(v << 4); | |
139 | } | |
140 | } | |
f5e706ad | 141 | |
62875cff DM |
142 | static inline int pte_present(pte_t pte) |
143 | { | |
144 | return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE); | |
145 | } | |
f5e706ad SR |
146 | |
147 | static inline int pte_none(pte_t pte) | |
148 | { | |
c87fe1c0 | 149 | return !pte_val(pte); |
f5e706ad SR |
150 | } |
151 | ||
a46d6056 DM |
152 | static inline void __pte_clear(pte_t *ptep) |
153 | { | |
62875cff | 154 | set_pte(ptep, __pte(0)); |
a46d6056 DM |
155 | } |
156 | ||
157 | static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
158 | { | |
159 | __pte_clear(ptep); | |
160 | } | |
f5e706ad | 161 | |
f167edae DM |
162 | static inline int pmd_bad(pmd_t pmd) |
163 | { | |
164 | return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; | |
165 | } | |
166 | ||
167 | static inline int pmd_present(pmd_t pmd) | |
168 | { | |
169 | return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); | |
170 | } | |
f5e706ad SR |
171 | |
172 | static inline int pmd_none(pmd_t pmd) | |
173 | { | |
c87fe1c0 | 174 | return !pmd_val(pmd); |
f5e706ad SR |
175 | } |
176 | ||
a46d6056 DM |
177 | static inline void pmd_clear(pmd_t *pmdp) |
178 | { | |
179 | int i; | |
180 | for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) | |
62875cff | 181 | set_pte((pte_t *)&pmdp->pmdv[i], __pte(0)); |
a46d6056 | 182 | } |
f5e706ad | 183 | |
7d9fa4aa DM |
184 | static inline int pgd_none(pgd_t pgd) |
185 | { | |
186 | return !(pgd_val(pgd) & 0xFFFFFFF); | |
187 | } | |
f5e706ad | 188 | |
7d9fa4aa DM |
189 | static inline int pgd_bad(pgd_t pgd) |
190 | { | |
191 | return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; | |
192 | } | |
193 | ||
194 | static inline int pgd_present(pgd_t pgd) | |
195 | { | |
196 | return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); | |
197 | } | |
a46d6056 DM |
198 | |
199 | static inline void pgd_clear(pgd_t *pgdp) | |
200 | { | |
62875cff | 201 | set_pte((pte_t *)pgdp, __pte(0)); |
a46d6056 | 202 | } |
f5e706ad SR |
203 | |
204 | /* | |
205 | * The following only work if pte_present() is true. | |
206 | * Undefined behaviour if not.. | |
207 | */ | |
f5e706ad SR |
208 | static inline int pte_write(pte_t pte) |
209 | { | |
f755f77a | 210 | return pte_val(pte) & SRMMU_WRITE; |
f5e706ad SR |
211 | } |
212 | ||
f5e706ad SR |
213 | static inline int pte_dirty(pte_t pte) |
214 | { | |
f755f77a | 215 | return pte_val(pte) & SRMMU_DIRTY; |
f5e706ad SR |
216 | } |
217 | ||
f5e706ad SR |
218 | static inline int pte_young(pte_t pte) |
219 | { | |
f755f77a | 220 | return pte_val(pte) & SRMMU_REF; |
f5e706ad SR |
221 | } |
222 | ||
223 | /* | |
224 | * The following only work if pte_present() is not true. | |
225 | */ | |
f5e706ad SR |
226 | static inline int pte_file(pte_t pte) |
227 | { | |
301d5bbb | 228 | return pte_val(pte) & SRMMU_FILE; |
f5e706ad SR |
229 | } |
230 | ||
231 | static inline int pte_special(pte_t pte) | |
232 | { | |
233 | return 0; | |
234 | } | |
235 | ||
f5e706ad SR |
236 | static inline pte_t pte_wrprotect(pte_t pte) |
237 | { | |
301d5bbb | 238 | return __pte(pte_val(pte) & ~SRMMU_WRITE); |
f5e706ad SR |
239 | } |
240 | ||
f5e706ad SR |
241 | static inline pte_t pte_mkclean(pte_t pte) |
242 | { | |
301d5bbb | 243 | return __pte(pte_val(pte) & ~SRMMU_DIRTY); |
f5e706ad SR |
244 | } |
245 | ||
f5e706ad SR |
246 | static inline pte_t pte_mkold(pte_t pte) |
247 | { | |
301d5bbb | 248 | return __pte(pte_val(pte) & ~SRMMU_REF); |
f5e706ad SR |
249 | } |
250 | ||
301d5bbb DM |
251 | static inline pte_t pte_mkwrite(pte_t pte) |
252 | { | |
253 | return __pte(pte_val(pte) | SRMMU_WRITE); | |
254 | } | |
f5e706ad | 255 | |
301d5bbb DM |
256 | static inline pte_t pte_mkdirty(pte_t pte) |
257 | { | |
258 | return __pte(pte_val(pte) | SRMMU_DIRTY); | |
259 | } | |
260 | ||
261 | static inline pte_t pte_mkyoung(pte_t pte) | |
262 | { | |
263 | return __pte(pte_val(pte) | SRMMU_REF); | |
264 | } | |
f5e706ad SR |
265 | |
266 | #define pte_mkspecial(pte) (pte) | |
267 | ||
268 | #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) | |
269 | ||
3d827367 DM |
270 | static inline unsigned long pte_pfn(pte_t pte) |
271 | { | |
272 | if (srmmu_device_memory(pte_val(pte))) { | |
273 | /* Just return something that will cause | |
274 | * pfn_valid() to return false. This makes | |
275 | * copy_one_pte() to just directly copy to | |
276 | * PTE over. | |
277 | */ | |
278 | return ~0UL; | |
279 | } | |
280 | return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4); | |
281 | } | |
282 | ||
f5e706ad SR |
283 | #define pte_page(pte) pfn_to_page(pte_pfn(pte)) |
284 | ||
285 | /* | |
286 | * Conversion functions: convert a page and protection to a page entry, | |
287 | * and a page entry and page directory to the page they refer to. | |
288 | */ | |
62875cff DM |
289 | static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) |
290 | { | |
291 | return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot)); | |
292 | } | |
f5e706ad | 293 | |
62875cff DM |
294 | static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot) |
295 | { | |
296 | return __pte(((page) >> 4) | pgprot_val(pgprot)); | |
297 | } | |
f5e706ad | 298 | |
62875cff DM |
299 | static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space) |
300 | { | |
301 | return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot)); | |
302 | } | |
f5e706ad | 303 | |
afaedde7 SR |
304 | #define pgprot_noncached pgprot_noncached |
305 | static inline pgprot_t pgprot_noncached(pgprot_t prot) | |
306 | { | |
307 | prot &= ~__pgprot(SRMMU_CACHE); | |
308 | return prot; | |
309 | } | |
f5e706ad | 310 | |
f5e706ad SR |
311 | static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; |
312 | static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) | |
313 | { | |
9701b264 | 314 | return __pte((pte_val(pte) & SRMMU_CHG_MASK) | |
f5e706ad SR |
315 | pgprot_val(newprot)); |
316 | } | |
317 | ||
318 | #define pgd_index(address) ((address) >> PGDIR_SHIFT) | |
319 | ||
320 | /* to find an entry in a page-table-directory */ | |
321 | #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) | |
322 | ||
323 | /* to find an entry in a kernel page-table-directory */ | |
324 | #define pgd_offset_k(address) pgd_offset(&init_mm, address) | |
325 | ||
326 | /* Find an entry in the second-level page table.. */ | |
9701b264 SR |
327 | static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address) |
328 | { | |
329 | return (pmd_t *) pgd_page_vaddr(*dir) + | |
330 | ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); | |
331 | } | |
f5e706ad SR |
332 | |
333 | /* Find an entry in the third-level page table.. */ | |
9701b264 | 334 | pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address); |
f5e706ad SR |
335 | |
336 | /* | |
ee906c9e | 337 | * This shortcut works on sun4m (and sun4d) because the nocache area is static. |
f5e706ad SR |
338 | */ |
339 | #define pte_offset_map(d, a) pte_offset_kernel(d,a) | |
f5e706ad | 340 | #define pte_unmap(pte) do{}while(0) |
f5e706ad | 341 | |
f5e706ad | 342 | struct seq_file; |
9701b264 | 343 | void mmu_info(struct seq_file *m); |
f5e706ad SR |
344 | |
345 | /* Fault handler stuff... */ | |
346 | #define FAULT_CODE_PROT 0x1 | |
347 | #define FAULT_CODE_WRITE 0x2 | |
348 | #define FAULT_CODE_USER 0x4 | |
349 | ||
f613914e | 350 | #define update_mmu_cache(vma, address, ptep) do { } while (0) |
f5e706ad | 351 | |
9701b264 SR |
352 | void srmmu_mapiorange(unsigned int bus, unsigned long xpa, |
353 | unsigned long xva, unsigned int len); | |
354 | void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len); | |
f5e706ad | 355 | |
f5e706ad | 356 | /* Encode and de-code a swap entry */ |
9701b264 SR |
357 | static inline unsigned long __swp_type(swp_entry_t entry) |
358 | { | |
359 | return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; | |
360 | } | |
f5e706ad | 361 | |
9701b264 SR |
362 | static inline unsigned long __swp_offset(swp_entry_t entry) |
363 | { | |
364 | return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK; | |
365 | } | |
366 | ||
367 | static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) | |
368 | { | |
369 | return (swp_entry_t) { | |
370 | (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT | |
371 | | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT }; | |
372 | } | |
f5e706ad SR |
373 | |
374 | #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) | |
375 | #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) | |
376 | ||
377 | /* file-offset-in-pte helpers */ | |
afaedde7 SR |
378 | static inline unsigned long pte_to_pgoff(pte_t pte) |
379 | { | |
380 | return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT; | |
381 | } | |
f5e706ad | 382 | |
afaedde7 SR |
383 | static inline pte_t pgoff_to_pte(unsigned long pgoff) |
384 | { | |
385 | return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE); | |
386 | } | |
f5e706ad SR |
387 | |
388 | /* | |
389 | * This is made a constant because mm/fremap.c required a constant. | |
f5e706ad SR |
390 | */ |
391 | #define PTE_FILE_MAX_BITS 24 | |
392 | ||
f5e706ad SR |
393 | static inline unsigned long |
394 | __get_phys (unsigned long addr) | |
395 | { | |
396 | switch (sparc_cpu_model){ | |
f5e706ad SR |
397 | case sun4m: |
398 | case sun4d: | |
399 | return ((srmmu_get_pte (addr) & 0xffffff00) << 4); | |
400 | default: | |
401 | return 0; | |
402 | } | |
403 | } | |
404 | ||
405 | static inline int | |
406 | __get_iospace (unsigned long addr) | |
407 | { | |
408 | switch (sparc_cpu_model){ | |
f5e706ad SR |
409 | case sun4m: |
410 | case sun4d: | |
411 | return (srmmu_get_pte (addr) >> 28); | |
412 | default: | |
413 | return -1; | |
414 | } | |
415 | } | |
416 | ||
417 | extern unsigned long *sparc_valid_addr_bitmap; | |
418 | ||
419 | /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ | |
420 | #define kern_addr_valid(addr) \ | |
421 | (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) | |
422 | ||
f5e706ad SR |
423 | /* |
424 | * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in | |
425 | * its high 4 bits. These macros/functions put it there or get it from there. | |
426 | */ | |
427 | #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) | |
428 | #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) | |
429 | #define GET_PFN(pfn) (pfn & 0x0fffffffUL) | |
430 | ||
3e37fd31 DM |
431 | extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long, |
432 | unsigned long, pgprot_t); | |
433 | ||
434 | static inline 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 | unsigned long long offset, space, phys_base; | |
439 | ||
440 | offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT; | |
441 | space = GET_IOSPACE(pfn); | |
442 | phys_base = offset | (space << 32ULL); | |
443 | ||
444 | return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot); | |
445 | } | |
40d158e6 | 446 | #define io_remap_pfn_range io_remap_pfn_range |
3e37fd31 | 447 | |
f5e706ad SR |
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 | } \ | |
1ee0e144 | 456 | __changed; \ |
f5e706ad SR |
457 | }) |
458 | ||
459 | #include <asm-generic/pgtable.h> | |
460 | ||
461 | #endif /* !(__ASSEMBLY__) */ | |
462 | ||
eb485d64 | 463 | #define VMALLOC_START _AC(0xfe600000,UL) |
eb485d64 | 464 | #define VMALLOC_END _AC(0xffc00000,UL) |
f5e706ad | 465 | |
f5e706ad SR |
466 | /* We provide our own get_unmapped_area to cope with VA holes for userland */ |
467 | #define HAVE_ARCH_UNMAPPED_AREA | |
468 | ||
469 | /* | |
470 | * No page table caches to initialise | |
471 | */ | |
472 | #define pgtable_cache_init() do { } while (0) | |
473 | ||
474 | #endif /* !(_SPARC_PGTABLE_H) */ |