Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * srmmu.c: SRMMU specific routines for memory management. | |
3 | * | |
4 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
5 | * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@yahoo.com) | |
6 | * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) | |
7 | * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
8 | * Copyright (C) 1999,2000 Anton Blanchard (anton@samba.org) | |
9 | */ | |
10 | ||
4a049b03 | 11 | #include <linux/seq_file.h> |
1da177e4 LT |
12 | #include <linux/spinlock.h> |
13 | #include <linux/bootmem.h> | |
4a049b03 SR |
14 | #include <linux/pagemap.h> |
15 | #include <linux/vmalloc.h> | |
1eeb66a1 | 16 | #include <linux/kdebug.h> |
a56b072f | 17 | #include <linux/export.h> |
4a049b03 SR |
18 | #include <linux/kernel.h> |
19 | #include <linux/init.h> | |
949e8274 | 20 | #include <linux/log2.h> |
5a0e3ad6 | 21 | #include <linux/gfp.h> |
4a049b03 SR |
22 | #include <linux/fs.h> |
23 | #include <linux/mm.h> | |
1da177e4 | 24 | |
4a049b03 SR |
25 | #include <asm/mmu_context.h> |
26 | #include <asm/cacheflush.h> | |
27 | #include <asm/tlbflush.h> | |
28 | #include <asm/io-unit.h> | |
1da177e4 LT |
29 | #include <asm/pgalloc.h> |
30 | #include <asm/pgtable.h> | |
4a049b03 | 31 | #include <asm/bitext.h> |
1da177e4 | 32 | #include <asm/vaddrs.h> |
1da177e4 | 33 | #include <asm/cache.h> |
4a049b03 | 34 | #include <asm/traps.h> |
1da177e4 | 35 | #include <asm/oplib.h> |
4a049b03 SR |
36 | #include <asm/mbus.h> |
37 | #include <asm/page.h> | |
1da177e4 LT |
38 | #include <asm/asi.h> |
39 | #include <asm/msi.h> | |
4a049b03 SR |
40 | #include <asm/smp.h> |
41 | #include <asm/io.h> | |
1da177e4 LT |
42 | |
43 | /* Now the cpu specific definitions. */ | |
4a049b03 | 44 | #include <asm/turbosparc.h> |
1da177e4 | 45 | #include <asm/tsunami.h> |
4a049b03 | 46 | #include <asm/viking.h> |
1da177e4 | 47 | #include <asm/swift.h> |
75d9e346 | 48 | #include <asm/leon.h> |
4a049b03 SR |
49 | #include <asm/mxcc.h> |
50 | #include <asm/ross.h> | |
1da177e4 | 51 | |
ddb7417e | 52 | #include "mm_32.h" |
accf032c | 53 | |
1da177e4 | 54 | enum mbus_module srmmu_modtype; |
50215d65 | 55 | static unsigned int hwbug_bitmask; |
1da177e4 LT |
56 | int vac_cache_size; |
57 | int vac_line_size; | |
58 | ||
59 | extern struct resource sparc_iomap; | |
60 | ||
61 | extern unsigned long last_valid_pfn; | |
62 | ||
50215d65 | 63 | static pgd_t *srmmu_swapper_pg_dir; |
1da177e4 | 64 | |
5d83d666 | 65 | const struct sparc32_cachetlb_ops *sparc32_cachetlb_ops; |
a56b072f | 66 | EXPORT_SYMBOL(sparc32_cachetlb_ops); |
5d83d666 | 67 | |
1da177e4 | 68 | #ifdef CONFIG_SMP |
5d83d666 DM |
69 | const struct sparc32_cachetlb_ops *local_ops; |
70 | ||
1da177e4 LT |
71 | #define FLUSH_BEGIN(mm) |
72 | #define FLUSH_END | |
73 | #else | |
5d83d666 | 74 | #define FLUSH_BEGIN(mm) if ((mm)->context != NO_CONTEXT) { |
1da177e4 LT |
75 | #define FLUSH_END } |
76 | #endif | |
77 | ||
1da177e4 LT |
78 | int flush_page_for_dma_global = 1; |
79 | ||
1da177e4 LT |
80 | char *srmmu_name; |
81 | ||
82 | ctxd_t *srmmu_ctx_table_phys; | |
50215d65 | 83 | static ctxd_t *srmmu_context_table; |
1da177e4 LT |
84 | |
85 | int viking_mxcc_present; | |
86 | static DEFINE_SPINLOCK(srmmu_context_spinlock); | |
87 | ||
50215d65 | 88 | static int is_hypersparc; |
1da177e4 | 89 | |
50215d65 | 90 | static int srmmu_cache_pagetables; |
1da177e4 LT |
91 | |
92 | /* these will be initialized in srmmu_nocache_calcsize() */ | |
50215d65 AB |
93 | static unsigned long srmmu_nocache_size; |
94 | static unsigned long srmmu_nocache_end; | |
1da177e4 LT |
95 | |
96 | /* 1 bit <=> 256 bytes of nocache <=> 64 PTEs */ | |
97 | #define SRMMU_NOCACHE_BITMAP_SHIFT (PAGE_SHIFT - 4) | |
98 | ||
99 | /* The context table is a nocache user with the biggest alignment needs. */ | |
100 | #define SRMMU_NOCACHE_ALIGN_MAX (sizeof(ctxd_t)*SRMMU_MAX_CONTEXTS) | |
101 | ||
102 | void *srmmu_nocache_pool; | |
1da177e4 LT |
103 | static struct bit_map srmmu_nocache_map; |
104 | ||
1da177e4 LT |
105 | static inline int srmmu_pmd_none(pmd_t pmd) |
106 | { return !(pmd_val(pmd) & 0xFFFFFFF); } | |
107 | ||
1da177e4 LT |
108 | /* XXX should we hyper_flush_whole_icache here - Anton */ |
109 | static inline void srmmu_ctxd_set(ctxd_t *ctxp, pgd_t *pgdp) | |
62875cff | 110 | { set_pte((pte_t *)ctxp, (SRMMU_ET_PTD | (__nocache_pa((unsigned long) pgdp) >> 4))); } |
1da177e4 | 111 | |
642ea3ed | 112 | void pmd_set(pmd_t *pmdp, pte_t *ptep) |
1da177e4 LT |
113 | { |
114 | unsigned long ptp; /* Physical address, shifted right by 4 */ | |
115 | int i; | |
116 | ||
117 | ptp = __nocache_pa((unsigned long) ptep) >> 4; | |
118 | for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) { | |
62875cff | 119 | set_pte((pte_t *)&pmdp->pmdv[i], SRMMU_ET_PTD | ptp); |
1da177e4 LT |
120 | ptp += (SRMMU_REAL_PTRS_PER_PTE*sizeof(pte_t) >> 4); |
121 | } | |
122 | } | |
123 | ||
642ea3ed | 124 | void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep) |
1da177e4 LT |
125 | { |
126 | unsigned long ptp; /* Physical address, shifted right by 4 */ | |
127 | int i; | |
128 | ||
129 | ptp = page_to_pfn(ptep) << (PAGE_SHIFT-4); /* watch for overflow */ | |
130 | for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) { | |
62875cff | 131 | set_pte((pte_t *)&pmdp->pmdv[i], SRMMU_ET_PTD | ptp); |
1da177e4 LT |
132 | ptp += (SRMMU_REAL_PTRS_PER_PTE*sizeof(pte_t) >> 4); |
133 | } | |
134 | } | |
135 | ||
605ae962 SR |
136 | /* Find an entry in the third-level page table.. */ |
137 | pte_t *pte_offset_kernel(pmd_t *dir, unsigned long address) | |
1da177e4 LT |
138 | { |
139 | void *pte; | |
140 | ||
141 | pte = __nocache_va((dir->pmdv[0] & SRMMU_PTD_PMASK) << 4); | |
142 | return (pte_t *) pte + | |
143 | ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); | |
144 | } | |
145 | ||
1da177e4 LT |
146 | /* |
147 | * size: bytes to allocate in the nocache area. | |
148 | * align: bytes, number to align at. | |
149 | * Returns the virtual address of the allocated area. | |
150 | */ | |
f71a2aac | 151 | static void *__srmmu_get_nocache(int size, int align) |
1da177e4 LT |
152 | { |
153 | int offset; | |
f71a2aac | 154 | unsigned long addr; |
1da177e4 LT |
155 | |
156 | if (size < SRMMU_NOCACHE_BITMAP_SHIFT) { | |
f71a2aac SR |
157 | printk(KERN_ERR "Size 0x%x too small for nocache request\n", |
158 | size); | |
1da177e4 LT |
159 | size = SRMMU_NOCACHE_BITMAP_SHIFT; |
160 | } | |
f71a2aac SR |
161 | if (size & (SRMMU_NOCACHE_BITMAP_SHIFT - 1)) { |
162 | printk(KERN_ERR "Size 0x%x unaligned int nocache request\n", | |
163 | size); | |
164 | size += SRMMU_NOCACHE_BITMAP_SHIFT - 1; | |
1da177e4 LT |
165 | } |
166 | BUG_ON(align > SRMMU_NOCACHE_ALIGN_MAX); | |
167 | ||
168 | offset = bit_map_string_get(&srmmu_nocache_map, | |
f71a2aac SR |
169 | size >> SRMMU_NOCACHE_BITMAP_SHIFT, |
170 | align >> SRMMU_NOCACHE_BITMAP_SHIFT); | |
1da177e4 | 171 | if (offset == -1) { |
f71a2aac SR |
172 | printk(KERN_ERR "srmmu: out of nocache %d: %d/%d\n", |
173 | size, (int) srmmu_nocache_size, | |
174 | srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT); | |
e8c29c83 | 175 | return NULL; |
1da177e4 LT |
176 | } |
177 | ||
f71a2aac SR |
178 | addr = SRMMU_NOCACHE_VADDR + (offset << SRMMU_NOCACHE_BITMAP_SHIFT); |
179 | return (void *)addr; | |
1da177e4 LT |
180 | } |
181 | ||
f71a2aac | 182 | void *srmmu_get_nocache(int size, int align) |
1da177e4 | 183 | { |
f71a2aac | 184 | void *tmp; |
1da177e4 LT |
185 | |
186 | tmp = __srmmu_get_nocache(size, align); | |
187 | ||
188 | if (tmp) | |
f71a2aac | 189 | memset(tmp, 0, size); |
1da177e4 LT |
190 | |
191 | return tmp; | |
192 | } | |
193 | ||
f71a2aac | 194 | void srmmu_free_nocache(void *addr, int size) |
1da177e4 | 195 | { |
f71a2aac | 196 | unsigned long vaddr; |
1da177e4 LT |
197 | int offset; |
198 | ||
f71a2aac | 199 | vaddr = (unsigned long)addr; |
1da177e4 LT |
200 | if (vaddr < SRMMU_NOCACHE_VADDR) { |
201 | printk("Vaddr %lx is smaller than nocache base 0x%lx\n", | |
202 | vaddr, (unsigned long)SRMMU_NOCACHE_VADDR); | |
203 | BUG(); | |
204 | } | |
605ae962 | 205 | if (vaddr + size > srmmu_nocache_end) { |
1da177e4 LT |
206 | printk("Vaddr %lx is bigger than nocache end 0x%lx\n", |
207 | vaddr, srmmu_nocache_end); | |
208 | BUG(); | |
209 | } | |
949e8274 | 210 | if (!is_power_of_2(size)) { |
1da177e4 LT |
211 | printk("Size 0x%x is not a power of 2\n", size); |
212 | BUG(); | |
213 | } | |
214 | if (size < SRMMU_NOCACHE_BITMAP_SHIFT) { | |
215 | printk("Size 0x%x is too small\n", size); | |
216 | BUG(); | |
217 | } | |
605ae962 | 218 | if (vaddr & (size - 1)) { |
1da177e4 LT |
219 | printk("Vaddr %lx is not aligned to size 0x%x\n", vaddr, size); |
220 | BUG(); | |
221 | } | |
222 | ||
223 | offset = (vaddr - SRMMU_NOCACHE_VADDR) >> SRMMU_NOCACHE_BITMAP_SHIFT; | |
224 | size = size >> SRMMU_NOCACHE_BITMAP_SHIFT; | |
225 | ||
226 | bit_map_clear(&srmmu_nocache_map, offset, size); | |
227 | } | |
228 | ||
50215d65 AB |
229 | static void srmmu_early_allocate_ptable_skeleton(unsigned long start, |
230 | unsigned long end); | |
1da177e4 | 231 | |
d8a1b2b9 SR |
232 | /* Return how much physical memory we have. */ |
233 | static unsigned long __init probe_memory(void) | |
234 | { | |
235 | unsigned long total = 0; | |
236 | int i; | |
237 | ||
238 | for (i = 0; sp_banks[i].num_bytes; i++) | |
239 | total += sp_banks[i].num_bytes; | |
240 | ||
241 | return total; | |
242 | } | |
1da177e4 LT |
243 | |
244 | /* | |
245 | * Reserve nocache dynamically proportionally to the amount of | |
246 | * system RAM. -- Tomas Szepe <szepe@pinerecords.com>, June 2002 | |
247 | */ | |
32442467 | 248 | static void __init srmmu_nocache_calcsize(void) |
1da177e4 LT |
249 | { |
250 | unsigned long sysmemavail = probe_memory() / 1024; | |
251 | int srmmu_nocache_npages; | |
252 | ||
253 | srmmu_nocache_npages = | |
254 | sysmemavail / SRMMU_NOCACHE_ALCRATIO / 1024 * 256; | |
255 | ||
256 | /* P3 XXX The 4x overuse: corroborated by /proc/meminfo. */ | |
257 | // if (srmmu_nocache_npages < 256) srmmu_nocache_npages = 256; | |
258 | if (srmmu_nocache_npages < SRMMU_MIN_NOCACHE_PAGES) | |
259 | srmmu_nocache_npages = SRMMU_MIN_NOCACHE_PAGES; | |
260 | ||
261 | /* anything above 1280 blows up */ | |
262 | if (srmmu_nocache_npages > SRMMU_MAX_NOCACHE_PAGES) | |
263 | srmmu_nocache_npages = SRMMU_MAX_NOCACHE_PAGES; | |
264 | ||
265 | srmmu_nocache_size = srmmu_nocache_npages * PAGE_SIZE; | |
266 | srmmu_nocache_end = SRMMU_NOCACHE_VADDR + srmmu_nocache_size; | |
267 | } | |
268 | ||
50215d65 | 269 | static void __init srmmu_nocache_init(void) |
1da177e4 | 270 | { |
e8c29c83 | 271 | void *srmmu_nocache_bitmap; |
1da177e4 LT |
272 | unsigned int bitmap_bits; |
273 | pgd_t *pgd; | |
274 | pmd_t *pmd; | |
275 | pte_t *pte; | |
276 | unsigned long paddr, vaddr; | |
277 | unsigned long pteval; | |
278 | ||
279 | bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT; | |
280 | ||
281 | srmmu_nocache_pool = __alloc_bootmem(srmmu_nocache_size, | |
282 | SRMMU_NOCACHE_ALIGN_MAX, 0UL); | |
283 | memset(srmmu_nocache_pool, 0, srmmu_nocache_size); | |
284 | ||
54df2db3 AM |
285 | srmmu_nocache_bitmap = |
286 | __alloc_bootmem(BITS_TO_LONGS(bitmap_bits) * sizeof(long), | |
287 | SMP_CACHE_BYTES, 0UL); | |
1da177e4 LT |
288 | bit_map_init(&srmmu_nocache_map, srmmu_nocache_bitmap, bitmap_bits); |
289 | ||
f71a2aac | 290 | srmmu_swapper_pg_dir = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE); |
1da177e4 LT |
291 | memset(__nocache_fix(srmmu_swapper_pg_dir), 0, SRMMU_PGD_TABLE_SIZE); |
292 | init_mm.pgd = srmmu_swapper_pg_dir; | |
293 | ||
294 | srmmu_early_allocate_ptable_skeleton(SRMMU_NOCACHE_VADDR, srmmu_nocache_end); | |
295 | ||
296 | paddr = __pa((unsigned long)srmmu_nocache_pool); | |
297 | vaddr = SRMMU_NOCACHE_VADDR; | |
298 | ||
299 | while (vaddr < srmmu_nocache_end) { | |
300 | pgd = pgd_offset_k(vaddr); | |
9701b264 SR |
301 | pmd = pmd_offset(__nocache_fix(pgd), vaddr); |
302 | pte = pte_offset_kernel(__nocache_fix(pmd), vaddr); | |
1da177e4 LT |
303 | |
304 | pteval = ((paddr >> 4) | SRMMU_ET_PTE | SRMMU_PRIV); | |
305 | ||
306 | if (srmmu_cache_pagetables) | |
307 | pteval |= SRMMU_CACHE; | |
308 | ||
62875cff | 309 | set_pte(__nocache_fix(pte), __pte(pteval)); |
1da177e4 LT |
310 | |
311 | vaddr += PAGE_SIZE; | |
312 | paddr += PAGE_SIZE; | |
313 | } | |
314 | ||
315 | flush_cache_all(); | |
316 | flush_tlb_all(); | |
317 | } | |
318 | ||
642ea3ed | 319 | pgd_t *get_pgd_fast(void) |
1da177e4 LT |
320 | { |
321 | pgd_t *pgd = NULL; | |
322 | ||
f71a2aac | 323 | pgd = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE); |
1da177e4 LT |
324 | if (pgd) { |
325 | pgd_t *init = pgd_offset_k(0); | |
326 | memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t)); | |
327 | memcpy(pgd + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
328 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
329 | } | |
330 | ||
331 | return pgd; | |
332 | } | |
333 | ||
1da177e4 LT |
334 | /* |
335 | * Hardware needs alignment to 256 only, but we align to whole page size | |
336 | * to reduce fragmentation problems due to the buddy principle. | |
337 | * XXX Provide actual fragmentation statistics in /proc. | |
338 | * | |
339 | * Alignments up to the page size are the same for physical and virtual | |
340 | * addresses of the nocache area. | |
341 | */ | |
642ea3ed | 342 | pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address) |
1da177e4 LT |
343 | { |
344 | unsigned long pte; | |
2f569afd | 345 | struct page *page; |
1da177e4 | 346 | |
642ea3ed | 347 | if ((pte = (unsigned long)pte_alloc_one_kernel(mm, address)) == 0) |
1da177e4 | 348 | return NULL; |
605ae962 | 349 | page = pfn_to_page(__nocache_pa(pte) >> PAGE_SHIFT); |
1ae9ae5f KS |
350 | if (!pgtable_page_ctor(page)) { |
351 | __free_page(page); | |
352 | return NULL; | |
353 | } | |
2f569afd | 354 | return page; |
1da177e4 LT |
355 | } |
356 | ||
642ea3ed | 357 | void pte_free(struct mm_struct *mm, pgtable_t pte) |
1da177e4 LT |
358 | { |
359 | unsigned long p; | |
360 | ||
2f569afd | 361 | pgtable_page_dtor(pte); |
1da177e4 LT |
362 | p = (unsigned long)page_address(pte); /* Cached address (for test) */ |
363 | if (p == 0) | |
364 | BUG(); | |
365 | p = page_to_pfn(pte) << PAGE_SHIFT; /* Physical address */ | |
f71a2aac SR |
366 | |
367 | /* free non cached virtual address*/ | |
368 | srmmu_free_nocache(__nocache_va(p), PTE_SIZE); | |
1da177e4 LT |
369 | } |
370 | ||
b585e855 SR |
371 | /* context handling - a dynamically sized pool is used */ |
372 | #define NO_CONTEXT -1 | |
373 | ||
374 | struct ctx_list { | |
375 | struct ctx_list *next; | |
376 | struct ctx_list *prev; | |
377 | unsigned int ctx_number; | |
378 | struct mm_struct *ctx_mm; | |
379 | }; | |
380 | ||
381 | static struct ctx_list *ctx_list_pool; | |
382 | static struct ctx_list ctx_free; | |
383 | static struct ctx_list ctx_used; | |
384 | ||
385 | /* At boot time we determine the number of contexts */ | |
386 | static int num_contexts; | |
387 | ||
388 | static inline void remove_from_ctx_list(struct ctx_list *entry) | |
389 | { | |
390 | entry->next->prev = entry->prev; | |
391 | entry->prev->next = entry->next; | |
392 | } | |
393 | ||
394 | static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) | |
395 | { | |
396 | entry->next = head; | |
397 | (entry->prev = head->prev)->next = entry; | |
398 | head->prev = entry; | |
399 | } | |
400 | #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) | |
401 | #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) | |
402 | ||
403 | ||
1da177e4 LT |
404 | static inline void alloc_context(struct mm_struct *old_mm, struct mm_struct *mm) |
405 | { | |
406 | struct ctx_list *ctxp; | |
407 | ||
408 | ctxp = ctx_free.next; | |
605ae962 | 409 | if (ctxp != &ctx_free) { |
1da177e4 LT |
410 | remove_from_ctx_list(ctxp); |
411 | add_to_used_ctxlist(ctxp); | |
412 | mm->context = ctxp->ctx_number; | |
413 | ctxp->ctx_mm = mm; | |
414 | return; | |
415 | } | |
416 | ctxp = ctx_used.next; | |
605ae962 | 417 | if (ctxp->ctx_mm == old_mm) |
1da177e4 | 418 | ctxp = ctxp->next; |
605ae962 | 419 | if (ctxp == &ctx_used) |
1da177e4 LT |
420 | panic("out of mmu contexts"); |
421 | flush_cache_mm(ctxp->ctx_mm); | |
422 | flush_tlb_mm(ctxp->ctx_mm); | |
423 | remove_from_ctx_list(ctxp); | |
424 | add_to_used_ctxlist(ctxp); | |
425 | ctxp->ctx_mm->context = NO_CONTEXT; | |
426 | ctxp->ctx_mm = mm; | |
427 | mm->context = ctxp->ctx_number; | |
428 | } | |
429 | ||
430 | static inline void free_context(int context) | |
431 | { | |
432 | struct ctx_list *ctx_old; | |
433 | ||
434 | ctx_old = ctx_list_pool + context; | |
435 | remove_from_ctx_list(ctx_old); | |
436 | add_to_free_ctxlist(ctx_old); | |
437 | } | |
438 | ||
b585e855 SR |
439 | static void __init sparc_context_init(int numctx) |
440 | { | |
441 | int ctx; | |
442 | unsigned long size; | |
443 | ||
444 | size = numctx * sizeof(struct ctx_list); | |
445 | ctx_list_pool = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL); | |
446 | ||
447 | for (ctx = 0; ctx < numctx; ctx++) { | |
448 | struct ctx_list *clist; | |
449 | ||
450 | clist = (ctx_list_pool + ctx); | |
451 | clist->ctx_number = ctx; | |
452 | clist->ctx_mm = NULL; | |
453 | } | |
454 | ctx_free.next = ctx_free.prev = &ctx_free; | |
455 | ctx_used.next = ctx_used.prev = &ctx_used; | |
456 | for (ctx = 0; ctx < numctx; ctx++) | |
457 | add_to_free_ctxlist(ctx_list_pool + ctx); | |
458 | } | |
1da177e4 | 459 | |
34d4accf SR |
460 | void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, |
461 | struct task_struct *tsk) | |
1da177e4 | 462 | { |
66d0f7ec AL |
463 | unsigned long flags; |
464 | ||
605ae962 | 465 | if (mm->context == NO_CONTEXT) { |
66d0f7ec | 466 | spin_lock_irqsave(&srmmu_context_spinlock, flags); |
1da177e4 | 467 | alloc_context(old_mm, mm); |
66d0f7ec | 468 | spin_unlock_irqrestore(&srmmu_context_spinlock, flags); |
1da177e4 LT |
469 | srmmu_ctxd_set(&srmmu_context_table[mm->context], mm->pgd); |
470 | } | |
471 | ||
75d9e346 KE |
472 | if (sparc_cpu_model == sparc_leon) |
473 | leon_switch_mm(); | |
474 | ||
1da177e4 LT |
475 | if (is_hypersparc) |
476 | hyper_flush_whole_icache(); | |
477 | ||
478 | srmmu_set_context(mm->context); | |
479 | } | |
480 | ||
481 | /* Low level IO area allocation on the SRMMU. */ | |
482 | static inline void srmmu_mapioaddr(unsigned long physaddr, | |
605ae962 | 483 | unsigned long virt_addr, int bus_type) |
1da177e4 LT |
484 | { |
485 | pgd_t *pgdp; | |
486 | pmd_t *pmdp; | |
487 | pte_t *ptep; | |
488 | unsigned long tmp; | |
489 | ||
490 | physaddr &= PAGE_MASK; | |
491 | pgdp = pgd_offset_k(virt_addr); | |
9701b264 SR |
492 | pmdp = pmd_offset(pgdp, virt_addr); |
493 | ptep = pte_offset_kernel(pmdp, virt_addr); | |
1da177e4 LT |
494 | tmp = (physaddr >> 4) | SRMMU_ET_PTE; |
495 | ||
605ae962 | 496 | /* I need to test whether this is consistent over all |
1da177e4 LT |
497 | * sun4m's. The bus_type represents the upper 4 bits of |
498 | * 36-bit physical address on the I/O space lines... | |
499 | */ | |
500 | tmp |= (bus_type << 28); | |
501 | tmp |= SRMMU_PRIV; | |
502 | __flush_page_to_ram(virt_addr); | |
62875cff | 503 | set_pte(ptep, __pte(tmp)); |
1da177e4 LT |
504 | } |
505 | ||
9701b264 SR |
506 | void srmmu_mapiorange(unsigned int bus, unsigned long xpa, |
507 | unsigned long xva, unsigned int len) | |
1da177e4 LT |
508 | { |
509 | while (len != 0) { | |
510 | len -= PAGE_SIZE; | |
511 | srmmu_mapioaddr(xpa, xva, bus); | |
512 | xva += PAGE_SIZE; | |
513 | xpa += PAGE_SIZE; | |
514 | } | |
515 | flush_tlb_all(); | |
516 | } | |
517 | ||
518 | static inline void srmmu_unmapioaddr(unsigned long virt_addr) | |
519 | { | |
520 | pgd_t *pgdp; | |
521 | pmd_t *pmdp; | |
522 | pte_t *ptep; | |
523 | ||
524 | pgdp = pgd_offset_k(virt_addr); | |
9701b264 SR |
525 | pmdp = pmd_offset(pgdp, virt_addr); |
526 | ptep = pte_offset_kernel(pmdp, virt_addr); | |
1da177e4 LT |
527 | |
528 | /* No need to flush uncacheable page. */ | |
a46d6056 | 529 | __pte_clear(ptep); |
1da177e4 LT |
530 | } |
531 | ||
9701b264 | 532 | void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len) |
1da177e4 LT |
533 | { |
534 | while (len != 0) { | |
535 | len -= PAGE_SIZE; | |
536 | srmmu_unmapioaddr(virt_addr); | |
537 | virt_addr += PAGE_SIZE; | |
538 | } | |
539 | flush_tlb_all(); | |
540 | } | |
541 | ||
1da177e4 LT |
542 | /* tsunami.S */ |
543 | extern void tsunami_flush_cache_all(void); | |
544 | extern void tsunami_flush_cache_mm(struct mm_struct *mm); | |
545 | extern void tsunami_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); | |
546 | extern void tsunami_flush_cache_page(struct vm_area_struct *vma, unsigned long page); | |
547 | extern void tsunami_flush_page_to_ram(unsigned long page); | |
548 | extern void tsunami_flush_page_for_dma(unsigned long page); | |
549 | extern void tsunami_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); | |
550 | extern void tsunami_flush_tlb_all(void); | |
551 | extern void tsunami_flush_tlb_mm(struct mm_struct *mm); | |
552 | extern void tsunami_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); | |
553 | extern void tsunami_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); | |
554 | extern void tsunami_setup_blockops(void); | |
555 | ||
1da177e4 LT |
556 | /* swift.S */ |
557 | extern void swift_flush_cache_all(void); | |
558 | extern void swift_flush_cache_mm(struct mm_struct *mm); | |
559 | extern void swift_flush_cache_range(struct vm_area_struct *vma, | |
560 | unsigned long start, unsigned long end); | |
561 | extern void swift_flush_cache_page(struct vm_area_struct *vma, unsigned long page); | |
562 | extern void swift_flush_page_to_ram(unsigned long page); | |
563 | extern void swift_flush_page_for_dma(unsigned long page); | |
564 | extern void swift_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); | |
565 | extern void swift_flush_tlb_all(void); | |
566 | extern void swift_flush_tlb_mm(struct mm_struct *mm); | |
567 | extern void swift_flush_tlb_range(struct vm_area_struct *vma, | |
568 | unsigned long start, unsigned long end); | |
569 | extern void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); | |
570 | ||
571 | #if 0 /* P3: deadwood to debug precise flushes on Swift. */ | |
572 | void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
573 | { | |
574 | int cctx, ctx1; | |
575 | ||
576 | page &= PAGE_MASK; | |
577 | if ((ctx1 = vma->vm_mm->context) != -1) { | |
578 | cctx = srmmu_get_context(); | |
579 | /* Is context # ever different from current context? P3 */ | |
580 | if (cctx != ctx1) { | |
581 | printk("flush ctx %02x curr %02x\n", ctx1, cctx); | |
582 | srmmu_set_context(ctx1); | |
583 | swift_flush_page(page); | |
584 | __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : | |
585 | "r" (page), "i" (ASI_M_FLUSH_PROBE)); | |
586 | srmmu_set_context(cctx); | |
587 | } else { | |
588 | /* Rm. prot. bits from virt. c. */ | |
589 | /* swift_flush_cache_all(); */ | |
590 | /* swift_flush_cache_page(vma, page); */ | |
591 | swift_flush_page(page); | |
592 | ||
593 | __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : : | |
594 | "r" (page), "i" (ASI_M_FLUSH_PROBE)); | |
595 | /* same as above: srmmu_flush_tlb_page() */ | |
596 | } | |
597 | } | |
598 | } | |
599 | #endif | |
600 | ||
601 | /* | |
602 | * The following are all MBUS based SRMMU modules, and therefore could | |
603 | * be found in a multiprocessor configuration. On the whole, these | |
604 | * chips seems to be much more touchy about DVMA and page tables | |
605 | * with respect to cache coherency. | |
606 | */ | |
607 | ||
1da177e4 LT |
608 | /* viking.S */ |
609 | extern void viking_flush_cache_all(void); | |
610 | extern void viking_flush_cache_mm(struct mm_struct *mm); | |
611 | extern void viking_flush_cache_range(struct vm_area_struct *vma, unsigned long start, | |
612 | unsigned long end); | |
613 | extern void viking_flush_cache_page(struct vm_area_struct *vma, unsigned long page); | |
614 | extern void viking_flush_page_to_ram(unsigned long page); | |
615 | extern void viking_flush_page_for_dma(unsigned long page); | |
616 | extern void viking_flush_sig_insns(struct mm_struct *mm, unsigned long addr); | |
617 | extern void viking_flush_page(unsigned long page); | |
618 | extern void viking_mxcc_flush_page(unsigned long page); | |
619 | extern void viking_flush_tlb_all(void); | |
620 | extern void viking_flush_tlb_mm(struct mm_struct *mm); | |
621 | extern void viking_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
622 | unsigned long end); | |
623 | extern void viking_flush_tlb_page(struct vm_area_struct *vma, | |
624 | unsigned long page); | |
625 | extern void sun4dsmp_flush_tlb_all(void); | |
626 | extern void sun4dsmp_flush_tlb_mm(struct mm_struct *mm); | |
627 | extern void sun4dsmp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, | |
628 | unsigned long end); | |
629 | extern void sun4dsmp_flush_tlb_page(struct vm_area_struct *vma, | |
630 | unsigned long page); | |
631 | ||
632 | /* hypersparc.S */ | |
633 | extern void hypersparc_flush_cache_all(void); | |
634 | extern void hypersparc_flush_cache_mm(struct mm_struct *mm); | |
635 | extern void hypersparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); | |
636 | extern void hypersparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page); | |
637 | extern void hypersparc_flush_page_to_ram(unsigned long page); | |
638 | extern void hypersparc_flush_page_for_dma(unsigned long page); | |
639 | extern void hypersparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr); | |
640 | extern void hypersparc_flush_tlb_all(void); | |
641 | extern void hypersparc_flush_tlb_mm(struct mm_struct *mm); | |
642 | extern void hypersparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); | |
643 | extern void hypersparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page); | |
644 | extern void hypersparc_setup_blockops(void); | |
645 | ||
646 | /* | |
647 | * NOTE: All of this startup code assumes the low 16mb (approx.) of | |
648 | * kernel mappings are done with one single contiguous chunk of | |
649 | * ram. On small ram machines (classics mainly) we only get | |
650 | * around 8mb mapped for us. | |
651 | */ | |
652 | ||
50215d65 | 653 | static void __init early_pgtable_allocfail(char *type) |
1da177e4 LT |
654 | { |
655 | prom_printf("inherit_prom_mappings: Cannot alloc kernel %s.\n", type); | |
656 | prom_halt(); | |
657 | } | |
658 | ||
50215d65 AB |
659 | static void __init srmmu_early_allocate_ptable_skeleton(unsigned long start, |
660 | unsigned long end) | |
1da177e4 LT |
661 | { |
662 | pgd_t *pgdp; | |
663 | pmd_t *pmdp; | |
664 | pte_t *ptep; | |
665 | ||
605ae962 | 666 | while (start < end) { |
1da177e4 | 667 | pgdp = pgd_offset_k(start); |
7d9fa4aa | 668 | if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) { |
f71a2aac | 669 | pmdp = __srmmu_get_nocache( |
1da177e4 LT |
670 | SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); |
671 | if (pmdp == NULL) | |
672 | early_pgtable_allocfail("pmd"); | |
673 | memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE); | |
642ea3ed | 674 | pgd_set(__nocache_fix(pgdp), pmdp); |
1da177e4 | 675 | } |
9701b264 | 676 | pmdp = pmd_offset(__nocache_fix(pgdp), start); |
605ae962 | 677 | if (srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) { |
f71a2aac | 678 | ptep = __srmmu_get_nocache(PTE_SIZE, PTE_SIZE); |
1da177e4 LT |
679 | if (ptep == NULL) |
680 | early_pgtable_allocfail("pte"); | |
681 | memset(__nocache_fix(ptep), 0, PTE_SIZE); | |
642ea3ed | 682 | pmd_set(__nocache_fix(pmdp), ptep); |
1da177e4 LT |
683 | } |
684 | if (start > (0xffffffffUL - PMD_SIZE)) | |
685 | break; | |
686 | start = (start + PMD_SIZE) & PMD_MASK; | |
687 | } | |
688 | } | |
689 | ||
50215d65 AB |
690 | static void __init srmmu_allocate_ptable_skeleton(unsigned long start, |
691 | unsigned long end) | |
1da177e4 LT |
692 | { |
693 | pgd_t *pgdp; | |
694 | pmd_t *pmdp; | |
695 | pte_t *ptep; | |
696 | ||
605ae962 | 697 | while (start < end) { |
1da177e4 | 698 | pgdp = pgd_offset_k(start); |
7d9fa4aa | 699 | if (pgd_none(*pgdp)) { |
f71a2aac | 700 | pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE); |
1da177e4 LT |
701 | if (pmdp == NULL) |
702 | early_pgtable_allocfail("pmd"); | |
703 | memset(pmdp, 0, SRMMU_PMD_TABLE_SIZE); | |
642ea3ed | 704 | pgd_set(pgdp, pmdp); |
1da177e4 | 705 | } |
9701b264 | 706 | pmdp = pmd_offset(pgdp, start); |
605ae962 | 707 | if (srmmu_pmd_none(*pmdp)) { |
f71a2aac | 708 | ptep = __srmmu_get_nocache(PTE_SIZE, |
1da177e4 LT |
709 | PTE_SIZE); |
710 | if (ptep == NULL) | |
711 | early_pgtable_allocfail("pte"); | |
712 | memset(ptep, 0, PTE_SIZE); | |
642ea3ed | 713 | pmd_set(pmdp, ptep); |
1da177e4 LT |
714 | } |
715 | if (start > (0xffffffffUL - PMD_SIZE)) | |
716 | break; | |
717 | start = (start + PMD_SIZE) & PMD_MASK; | |
718 | } | |
719 | } | |
720 | ||
805918f8 SR |
721 | /* These flush types are not available on all chips... */ |
722 | static inline unsigned long srmmu_probe(unsigned long vaddr) | |
723 | { | |
724 | unsigned long retval; | |
725 | ||
726 | if (sparc_cpu_model != sparc_leon) { | |
727 | ||
728 | vaddr &= PAGE_MASK; | |
729 | __asm__ __volatile__("lda [%1] %2, %0\n\t" : | |
730 | "=r" (retval) : | |
731 | "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE)); | |
732 | } else { | |
e8c29c83 | 733 | retval = leon_swprobe(vaddr, NULL); |
805918f8 SR |
734 | } |
735 | return retval; | |
736 | } | |
737 | ||
1da177e4 LT |
738 | /* |
739 | * This is much cleaner than poking around physical address space | |
740 | * looking at the prom's page table directly which is what most | |
741 | * other OS's do. Yuck... this is much better. | |
742 | */ | |
50215d65 AB |
743 | static void __init srmmu_inherit_prom_mappings(unsigned long start, |
744 | unsigned long end) | |
1da177e4 | 745 | { |
7cdfbc74 SR |
746 | unsigned long probed; |
747 | unsigned long addr; | |
1da177e4 LT |
748 | pgd_t *pgdp; |
749 | pmd_t *pmdp; | |
750 | pte_t *ptep; | |
7cdfbc74 | 751 | int what; /* 0 = normal-pte, 1 = pmd-level pte, 2 = pgd-level pte */ |
1da177e4 | 752 | |
605ae962 | 753 | while (start <= end) { |
1da177e4 LT |
754 | if (start == 0) |
755 | break; /* probably wrap around */ | |
605ae962 | 756 | if (start == 0xfef00000) |
1da177e4 | 757 | start = KADB_DEBUGGER_BEGVM; |
7cdfbc74 SR |
758 | probed = srmmu_probe(start); |
759 | if (!probed) { | |
760 | /* continue probing until we find an entry */ | |
1da177e4 LT |
761 | start += PAGE_SIZE; |
762 | continue; | |
763 | } | |
605ae962 | 764 | |
1da177e4 LT |
765 | /* A red snapper, see what it really is. */ |
766 | what = 0; | |
7cdfbc74 | 767 | addr = start - PAGE_SIZE; |
605ae962 SR |
768 | |
769 | if (!(start & ~(SRMMU_REAL_PMD_MASK))) { | |
7cdfbc74 | 770 | if (srmmu_probe(addr + SRMMU_REAL_PMD_SIZE) == probed) |
1da177e4 LT |
771 | what = 1; |
772 | } | |
605ae962 SR |
773 | |
774 | if (!(start & ~(SRMMU_PGDIR_MASK))) { | |
7cdfbc74 | 775 | if (srmmu_probe(addr + SRMMU_PGDIR_SIZE) == probed) |
1da177e4 LT |
776 | what = 2; |
777 | } | |
605ae962 | 778 | |
1da177e4 | 779 | pgdp = pgd_offset_k(start); |
605ae962 | 780 | if (what == 2) { |
7cdfbc74 | 781 | *(pgd_t *)__nocache_fix(pgdp) = __pgd(probed); |
1da177e4 LT |
782 | start += SRMMU_PGDIR_SIZE; |
783 | continue; | |
784 | } | |
7d9fa4aa | 785 | if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) { |
7cdfbc74 SR |
786 | pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, |
787 | SRMMU_PMD_TABLE_SIZE); | |
1da177e4 LT |
788 | if (pmdp == NULL) |
789 | early_pgtable_allocfail("pmd"); | |
790 | memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE); | |
642ea3ed | 791 | pgd_set(__nocache_fix(pgdp), pmdp); |
1da177e4 | 792 | } |
9701b264 | 793 | pmdp = pmd_offset(__nocache_fix(pgdp), start); |
605ae962 | 794 | if (srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) { |
f71a2aac | 795 | ptep = __srmmu_get_nocache(PTE_SIZE, PTE_SIZE); |
1da177e4 LT |
796 | if (ptep == NULL) |
797 | early_pgtable_allocfail("pte"); | |
798 | memset(__nocache_fix(ptep), 0, PTE_SIZE); | |
642ea3ed | 799 | pmd_set(__nocache_fix(pmdp), ptep); |
1da177e4 | 800 | } |
605ae962 SR |
801 | if (what == 1) { |
802 | /* We bend the rule where all 16 PTPs in a pmd_t point | |
1da177e4 LT |
803 | * inside the same PTE page, and we leak a perfectly |
804 | * good hardware PTE piece. Alternatives seem worse. | |
805 | */ | |
806 | unsigned int x; /* Index of HW PMD in soft cluster */ | |
7cdfbc74 | 807 | unsigned long *val; |
1da177e4 | 808 | x = (start >> PMD_SHIFT) & 15; |
7cdfbc74 SR |
809 | val = &pmdp->pmdv[x]; |
810 | *(unsigned long *)__nocache_fix(val) = probed; | |
1da177e4 LT |
811 | start += SRMMU_REAL_PMD_SIZE; |
812 | continue; | |
813 | } | |
9701b264 | 814 | ptep = pte_offset_kernel(__nocache_fix(pmdp), start); |
7cdfbc74 | 815 | *(pte_t *)__nocache_fix(ptep) = __pte(probed); |
1da177e4 LT |
816 | start += PAGE_SIZE; |
817 | } | |
818 | } | |
819 | ||
820 | #define KERNEL_PTE(page_shifted) ((page_shifted)|SRMMU_CACHE|SRMMU_PRIV|SRMMU_VALID) | |
821 | ||
822 | /* Create a third-level SRMMU 16MB page mapping. */ | |
823 | static void __init do_large_mapping(unsigned long vaddr, unsigned long phys_base) | |
824 | { | |
825 | pgd_t *pgdp = pgd_offset_k(vaddr); | |
826 | unsigned long big_pte; | |
827 | ||
828 | big_pte = KERNEL_PTE(phys_base >> 4); | |
829 | *(pgd_t *)__nocache_fix(pgdp) = __pgd(big_pte); | |
830 | } | |
831 | ||
832 | /* Map sp_bank entry SP_ENTRY, starting at virtual address VBASE. */ | |
833 | static unsigned long __init map_spbank(unsigned long vbase, int sp_entry) | |
834 | { | |
835 | unsigned long pstart = (sp_banks[sp_entry].base_addr & SRMMU_PGDIR_MASK); | |
836 | unsigned long vstart = (vbase & SRMMU_PGDIR_MASK); | |
837 | unsigned long vend = SRMMU_PGDIR_ALIGN(vbase + sp_banks[sp_entry].num_bytes); | |
838 | /* Map "low" memory only */ | |
839 | const unsigned long min_vaddr = PAGE_OFFSET; | |
840 | const unsigned long max_vaddr = PAGE_OFFSET + SRMMU_MAXMEM; | |
841 | ||
842 | if (vstart < min_vaddr || vstart >= max_vaddr) | |
843 | return vstart; | |
605ae962 | 844 | |
1da177e4 LT |
845 | if (vend > max_vaddr || vend < min_vaddr) |
846 | vend = max_vaddr; | |
847 | ||
605ae962 | 848 | while (vstart < vend) { |
1da177e4 LT |
849 | do_large_mapping(vstart, pstart); |
850 | vstart += SRMMU_PGDIR_SIZE; pstart += SRMMU_PGDIR_SIZE; | |
851 | } | |
852 | return vstart; | |
853 | } | |
854 | ||
32442467 | 855 | static void __init map_kernel(void) |
1da177e4 LT |
856 | { |
857 | int i; | |
858 | ||
859 | if (phys_base > 0) { | |
860 | do_large_mapping(PAGE_OFFSET, phys_base); | |
861 | } | |
862 | ||
863 | for (i = 0; sp_banks[i].num_bytes != 0; i++) { | |
864 | map_spbank((unsigned long)__va(sp_banks[i].base_addr), i); | |
865 | } | |
1da177e4 LT |
866 | } |
867 | ||
2066aadd | 868 | void (*poke_srmmu)(void) = NULL; |
1da177e4 | 869 | |
1da177e4 LT |
870 | void __init srmmu_paging_init(void) |
871 | { | |
8d125562 AS |
872 | int i; |
873 | phandle cpunode; | |
1da177e4 LT |
874 | char node_str[128]; |
875 | pgd_t *pgd; | |
876 | pmd_t *pmd; | |
877 | pte_t *pte; | |
878 | unsigned long pages_avail; | |
879 | ||
b585e855 | 880 | init_mm.context = (unsigned long) NO_CONTEXT; |
1da177e4 LT |
881 | sparc_iomap.start = SUN4M_IOBASE_VADDR; /* 16MB of IOSPACE on all sun4m's. */ |
882 | ||
883 | if (sparc_cpu_model == sun4d) | |
884 | num_contexts = 65536; /* We know it is Viking */ | |
885 | else { | |
886 | /* Find the number of contexts on the srmmu. */ | |
887 | cpunode = prom_getchild(prom_root_node); | |
888 | num_contexts = 0; | |
605ae962 | 889 | while (cpunode != 0) { |
1da177e4 | 890 | prom_getstring(cpunode, "device_type", node_str, sizeof(node_str)); |
605ae962 | 891 | if (!strcmp(node_str, "cpu")) { |
1da177e4 LT |
892 | num_contexts = prom_getintdefault(cpunode, "mmu-nctx", 0x8); |
893 | break; | |
894 | } | |
895 | cpunode = prom_getsibling(cpunode); | |
896 | } | |
897 | } | |
898 | ||
605ae962 | 899 | if (!num_contexts) { |
1da177e4 LT |
900 | prom_printf("Something wrong, can't find cpu node in paging_init.\n"); |
901 | prom_halt(); | |
902 | } | |
903 | ||
904 | pages_avail = 0; | |
905 | last_valid_pfn = bootmem_init(&pages_avail); | |
906 | ||
907 | srmmu_nocache_calcsize(); | |
908 | srmmu_nocache_init(); | |
f71a2aac | 909 | srmmu_inherit_prom_mappings(0xfe400000, (LINUX_OPPROM_ENDVM - PAGE_SIZE)); |
1da177e4 LT |
910 | map_kernel(); |
911 | ||
912 | /* ctx table has to be physically aligned to its size */ | |
f71a2aac | 913 | srmmu_context_table = __srmmu_get_nocache(num_contexts * sizeof(ctxd_t), num_contexts * sizeof(ctxd_t)); |
1da177e4 LT |
914 | srmmu_ctx_table_phys = (ctxd_t *)__nocache_pa((unsigned long)srmmu_context_table); |
915 | ||
605ae962 | 916 | for (i = 0; i < num_contexts; i++) |
1da177e4 LT |
917 | srmmu_ctxd_set((ctxd_t *)__nocache_fix(&srmmu_context_table[i]), srmmu_swapper_pg_dir); |
918 | ||
919 | flush_cache_all(); | |
920 | srmmu_set_ctable_ptr((unsigned long)srmmu_ctx_table_phys); | |
a54123e2 BB |
921 | #ifdef CONFIG_SMP |
922 | /* Stop from hanging here... */ | |
5d83d666 | 923 | local_ops->tlb_all(); |
a54123e2 | 924 | #else |
1da177e4 | 925 | flush_tlb_all(); |
a54123e2 | 926 | #endif |
1da177e4 LT |
927 | poke_srmmu(); |
928 | ||
1da177e4 LT |
929 | srmmu_allocate_ptable_skeleton(sparc_iomap.start, IOBASE_END); |
930 | srmmu_allocate_ptable_skeleton(DVMA_VADDR, DVMA_END); | |
1da177e4 LT |
931 | |
932 | srmmu_allocate_ptable_skeleton( | |
933 | __fix_to_virt(__end_of_fixed_addresses - 1), FIXADDR_TOP); | |
934 | srmmu_allocate_ptable_skeleton(PKMAP_BASE, PKMAP_END); | |
935 | ||
936 | pgd = pgd_offset_k(PKMAP_BASE); | |
9701b264 SR |
937 | pmd = pmd_offset(pgd, PKMAP_BASE); |
938 | pte = pte_offset_kernel(pmd, PKMAP_BASE); | |
1da177e4 LT |
939 | pkmap_page_table = pte; |
940 | ||
941 | flush_cache_all(); | |
942 | flush_tlb_all(); | |
943 | ||
944 | sparc_context_init(num_contexts); | |
945 | ||
946 | kmap_init(); | |
947 | ||
948 | { | |
949 | unsigned long zones_size[MAX_NR_ZONES]; | |
950 | unsigned long zholes_size[MAX_NR_ZONES]; | |
951 | unsigned long npages; | |
952 | int znum; | |
953 | ||
954 | for (znum = 0; znum < MAX_NR_ZONES; znum++) | |
955 | zones_size[znum] = zholes_size[znum] = 0; | |
956 | ||
957 | npages = max_low_pfn - pfn_base; | |
958 | ||
959 | zones_size[ZONE_DMA] = npages; | |
960 | zholes_size[ZONE_DMA] = npages - pages_avail; | |
961 | ||
962 | npages = highend_pfn - max_low_pfn; | |
963 | zones_size[ZONE_HIGHMEM] = npages; | |
964 | zholes_size[ZONE_HIGHMEM] = npages - calc_highpages(); | |
965 | ||
9109fb7b | 966 | free_area_init_node(0, zones_size, pfn_base, zholes_size); |
1da177e4 LT |
967 | } |
968 | } | |
969 | ||
9701b264 | 970 | void mmu_info(struct seq_file *m) |
1da177e4 | 971 | { |
605ae962 | 972 | seq_printf(m, |
1da177e4 LT |
973 | "MMU type\t: %s\n" |
974 | "contexts\t: %d\n" | |
975 | "nocache total\t: %ld\n" | |
976 | "nocache used\t: %d\n", | |
977 | srmmu_name, | |
978 | num_contexts, | |
979 | srmmu_nocache_size, | |
980 | srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT); | |
981 | } | |
982 | ||
b585e855 SR |
983 | int init_new_context(struct task_struct *tsk, struct mm_struct *mm) |
984 | { | |
985 | mm->context = NO_CONTEXT; | |
986 | return 0; | |
987 | } | |
988 | ||
b796c6da | 989 | void destroy_context(struct mm_struct *mm) |
1da177e4 | 990 | { |
66d0f7ec | 991 | unsigned long flags; |
1da177e4 | 992 | |
605ae962 | 993 | if (mm->context != NO_CONTEXT) { |
1da177e4 LT |
994 | flush_cache_mm(mm); |
995 | srmmu_ctxd_set(&srmmu_context_table[mm->context], srmmu_swapper_pg_dir); | |
996 | flush_tlb_mm(mm); | |
66d0f7ec | 997 | spin_lock_irqsave(&srmmu_context_spinlock, flags); |
1da177e4 | 998 | free_context(mm->context); |
66d0f7ec | 999 | spin_unlock_irqrestore(&srmmu_context_spinlock, flags); |
1da177e4 LT |
1000 | mm->context = NO_CONTEXT; |
1001 | } | |
1002 | } | |
1003 | ||
1004 | /* Init various srmmu chip types. */ | |
1005 | static void __init srmmu_is_bad(void) | |
1006 | { | |
1007 | prom_printf("Could not determine SRMMU chip type.\n"); | |
1008 | prom_halt(); | |
1009 | } | |
1010 | ||
1011 | static void __init init_vac_layout(void) | |
1012 | { | |
8d125562 AS |
1013 | phandle nd; |
1014 | int cache_lines; | |
1da177e4 LT |
1015 | char node_str[128]; |
1016 | #ifdef CONFIG_SMP | |
1017 | int cpu = 0; | |
1018 | unsigned long max_size = 0; | |
1019 | unsigned long min_line_size = 0x10000000; | |
1020 | #endif | |
1021 | ||
1022 | nd = prom_getchild(prom_root_node); | |
605ae962 | 1023 | while ((nd = prom_getsibling(nd)) != 0) { |
1da177e4 | 1024 | prom_getstring(nd, "device_type", node_str, sizeof(node_str)); |
605ae962 | 1025 | if (!strcmp(node_str, "cpu")) { |
1da177e4 LT |
1026 | vac_line_size = prom_getint(nd, "cache-line-size"); |
1027 | if (vac_line_size == -1) { | |
605ae962 | 1028 | prom_printf("can't determine cache-line-size, halting.\n"); |
1da177e4 LT |
1029 | prom_halt(); |
1030 | } | |
1031 | cache_lines = prom_getint(nd, "cache-nlines"); | |
1032 | if (cache_lines == -1) { | |
1033 | prom_printf("can't determine cache-nlines, halting.\n"); | |
1034 | prom_halt(); | |
1035 | } | |
1036 | ||
1037 | vac_cache_size = cache_lines * vac_line_size; | |
1038 | #ifdef CONFIG_SMP | |
605ae962 | 1039 | if (vac_cache_size > max_size) |
1da177e4 | 1040 | max_size = vac_cache_size; |
605ae962 | 1041 | if (vac_line_size < min_line_size) |
1da177e4 | 1042 | min_line_size = vac_line_size; |
a54123e2 | 1043 | //FIXME: cpus not contiguous!! |
1da177e4 | 1044 | cpu++; |
ec7c14bd | 1045 | if (cpu >= nr_cpu_ids || !cpu_online(cpu)) |
1da177e4 LT |
1046 | break; |
1047 | #else | |
1048 | break; | |
1049 | #endif | |
1050 | } | |
1051 | } | |
605ae962 | 1052 | if (nd == 0) { |
1da177e4 LT |
1053 | prom_printf("No CPU nodes found, halting.\n"); |
1054 | prom_halt(); | |
1055 | } | |
1056 | #ifdef CONFIG_SMP | |
1057 | vac_cache_size = max_size; | |
1058 | vac_line_size = min_line_size; | |
1059 | #endif | |
1060 | printk("SRMMU: Using VAC size of %d bytes, line size %d bytes.\n", | |
1061 | (int)vac_cache_size, (int)vac_line_size); | |
1062 | } | |
1063 | ||
2066aadd | 1064 | static void poke_hypersparc(void) |
1da177e4 LT |
1065 | { |
1066 | volatile unsigned long clear; | |
1067 | unsigned long mreg = srmmu_get_mmureg(); | |
1068 | ||
1069 | hyper_flush_unconditional_combined(); | |
1070 | ||
1071 | mreg &= ~(HYPERSPARC_CWENABLE); | |
1072 | mreg |= (HYPERSPARC_CENABLE | HYPERSPARC_WBENABLE); | |
1073 | mreg |= (HYPERSPARC_CMODE); | |
1074 | ||
1075 | srmmu_set_mmureg(mreg); | |
1076 | ||
1077 | #if 0 /* XXX I think this is bad news... -DaveM */ | |
1078 | hyper_clear_all_tags(); | |
1079 | #endif | |
1080 | ||
1081 | put_ross_icr(HYPERSPARC_ICCR_FTD | HYPERSPARC_ICCR_ICE); | |
1082 | hyper_flush_whole_icache(); | |
1083 | clear = srmmu_get_faddr(); | |
1084 | clear = srmmu_get_fstatus(); | |
1085 | } | |
1086 | ||
5d83d666 DM |
1087 | static const struct sparc32_cachetlb_ops hypersparc_ops = { |
1088 | .cache_all = hypersparc_flush_cache_all, | |
1089 | .cache_mm = hypersparc_flush_cache_mm, | |
1090 | .cache_page = hypersparc_flush_cache_page, | |
1091 | .cache_range = hypersparc_flush_cache_range, | |
1092 | .tlb_all = hypersparc_flush_tlb_all, | |
1093 | .tlb_mm = hypersparc_flush_tlb_mm, | |
1094 | .tlb_page = hypersparc_flush_tlb_page, | |
1095 | .tlb_range = hypersparc_flush_tlb_range, | |
1096 | .page_to_ram = hypersparc_flush_page_to_ram, | |
1097 | .sig_insns = hypersparc_flush_sig_insns, | |
1098 | .page_for_dma = hypersparc_flush_page_for_dma, | |
1099 | }; | |
1100 | ||
1da177e4 LT |
1101 | static void __init init_hypersparc(void) |
1102 | { | |
1103 | srmmu_name = "ROSS HyperSparc"; | |
1104 | srmmu_modtype = HyperSparc; | |
1105 | ||
1106 | init_vac_layout(); | |
1107 | ||
1108 | is_hypersparc = 1; | |
5d83d666 | 1109 | sparc32_cachetlb_ops = &hypersparc_ops; |
1da177e4 LT |
1110 | |
1111 | poke_srmmu = poke_hypersparc; | |
1112 | ||
1113 | hypersparc_setup_blockops(); | |
1114 | } | |
1115 | ||
2066aadd | 1116 | static void poke_swift(void) |
1da177e4 LT |
1117 | { |
1118 | unsigned long mreg; | |
1119 | ||
1120 | /* Clear any crap from the cache or else... */ | |
1121 | swift_flush_cache_all(); | |
1122 | ||
1123 | /* Enable I & D caches */ | |
1124 | mreg = srmmu_get_mmureg(); | |
1125 | mreg |= (SWIFT_IE | SWIFT_DE); | |
1126 | /* | |
1127 | * The Swift branch folding logic is completely broken. At | |
1128 | * trap time, if things are just right, if can mistakenly | |
1129 | * think that a trap is coming from kernel mode when in fact | |
1130 | * it is coming from user mode (it mis-executes the branch in | |
1131 | * the trap code). So you see things like crashme completely | |
1132 | * hosing your machine which is completely unacceptable. Turn | |
1133 | * this shit off... nice job Fujitsu. | |
1134 | */ | |
1135 | mreg &= ~(SWIFT_BF); | |
1136 | srmmu_set_mmureg(mreg); | |
1137 | } | |
1138 | ||
5d83d666 DM |
1139 | static const struct sparc32_cachetlb_ops swift_ops = { |
1140 | .cache_all = swift_flush_cache_all, | |
1141 | .cache_mm = swift_flush_cache_mm, | |
1142 | .cache_page = swift_flush_cache_page, | |
1143 | .cache_range = swift_flush_cache_range, | |
1144 | .tlb_all = swift_flush_tlb_all, | |
1145 | .tlb_mm = swift_flush_tlb_mm, | |
1146 | .tlb_page = swift_flush_tlb_page, | |
1147 | .tlb_range = swift_flush_tlb_range, | |
1148 | .page_to_ram = swift_flush_page_to_ram, | |
1149 | .sig_insns = swift_flush_sig_insns, | |
1150 | .page_for_dma = swift_flush_page_for_dma, | |
1151 | }; | |
1152 | ||
1da177e4 LT |
1153 | #define SWIFT_MASKID_ADDR 0x10003018 |
1154 | static void __init init_swift(void) | |
1155 | { | |
1156 | unsigned long swift_rev; | |
1157 | ||
1158 | __asm__ __volatile__("lda [%1] %2, %0\n\t" | |
1159 | "srl %0, 0x18, %0\n\t" : | |
1160 | "=r" (swift_rev) : | |
1161 | "r" (SWIFT_MASKID_ADDR), "i" (ASI_M_BYPASS)); | |
1162 | srmmu_name = "Fujitsu Swift"; | |
605ae962 | 1163 | switch (swift_rev) { |
1da177e4 LT |
1164 | case 0x11: |
1165 | case 0x20: | |
1166 | case 0x23: | |
1167 | case 0x30: | |
1168 | srmmu_modtype = Swift_lots_o_bugs; | |
1169 | hwbug_bitmask |= (HWBUG_KERN_ACCBROKEN | HWBUG_KERN_CBITBROKEN); | |
1170 | /* | |
1171 | * Gee george, I wonder why Sun is so hush hush about | |
1172 | * this hardware bug... really braindamage stuff going | |
1173 | * on here. However I think we can find a way to avoid | |
1174 | * all of the workaround overhead under Linux. Basically, | |
1175 | * any page fault can cause kernel pages to become user | |
1176 | * accessible (the mmu gets confused and clears some of | |
1177 | * the ACC bits in kernel ptes). Aha, sounds pretty | |
1178 | * horrible eh? But wait, after extensive testing it appears | |
1179 | * that if you use pgd_t level large kernel pte's (like the | |
1180 | * 4MB pages on the Pentium) the bug does not get tripped | |
1181 | * at all. This avoids almost all of the major overhead. | |
1182 | * Welcome to a world where your vendor tells you to, | |
1183 | * "apply this kernel patch" instead of "sorry for the | |
1184 | * broken hardware, send it back and we'll give you | |
1185 | * properly functioning parts" | |
1186 | */ | |
1187 | break; | |
1188 | case 0x25: | |
1189 | case 0x31: | |
1190 | srmmu_modtype = Swift_bad_c; | |
1191 | hwbug_bitmask |= HWBUG_KERN_CBITBROKEN; | |
1192 | /* | |
1193 | * You see Sun allude to this hardware bug but never | |
1194 | * admit things directly, they'll say things like, | |
1195 | * "the Swift chip cache problems" or similar. | |
1196 | */ | |
1197 | break; | |
1198 | default: | |
1199 | srmmu_modtype = Swift_ok; | |
1200 | break; | |
6cb79b3f | 1201 | } |
1da177e4 | 1202 | |
5d83d666 | 1203 | sparc32_cachetlb_ops = &swift_ops; |
1da177e4 LT |
1204 | flush_page_for_dma_global = 0; |
1205 | ||
1206 | /* | |
1207 | * Are you now convinced that the Swift is one of the | |
1208 | * biggest VLSI abortions of all time? Bravo Fujitsu! | |
1209 | * Fujitsu, the !#?!%$'d up processor people. I bet if | |
1210 | * you examined the microcode of the Swift you'd find | |
1211 | * XXX's all over the place. | |
1212 | */ | |
1213 | poke_srmmu = poke_swift; | |
1214 | } | |
1215 | ||
1216 | static void turbosparc_flush_cache_all(void) | |
1217 | { | |
1218 | flush_user_windows(); | |
1219 | turbosparc_idflash_clear(); | |
1220 | } | |
1221 | ||
1222 | static void turbosparc_flush_cache_mm(struct mm_struct *mm) | |
1223 | { | |
1224 | FLUSH_BEGIN(mm) | |
1225 | flush_user_windows(); | |
1226 | turbosparc_idflash_clear(); | |
1227 | FLUSH_END | |
1228 | } | |
1229 | ||
1230 | static void turbosparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1231 | { | |
1232 | FLUSH_BEGIN(vma->vm_mm) | |
1233 | flush_user_windows(); | |
1234 | turbosparc_idflash_clear(); | |
1235 | FLUSH_END | |
1236 | } | |
1237 | ||
1238 | static void turbosparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page) | |
1239 | { | |
1240 | FLUSH_BEGIN(vma->vm_mm) | |
1241 | flush_user_windows(); | |
1242 | if (vma->vm_flags & VM_EXEC) | |
1243 | turbosparc_flush_icache(); | |
1244 | turbosparc_flush_dcache(); | |
1245 | FLUSH_END | |
1246 | } | |
1247 | ||
1248 | /* TurboSparc is copy-back, if we turn it on, but this does not work. */ | |
1249 | static void turbosparc_flush_page_to_ram(unsigned long page) | |
1250 | { | |
1251 | #ifdef TURBOSPARC_WRITEBACK | |
1252 | volatile unsigned long clear; | |
1253 | ||
805918f8 | 1254 | if (srmmu_probe(page)) |
1da177e4 LT |
1255 | turbosparc_flush_page_cache(page); |
1256 | clear = srmmu_get_fstatus(); | |
1257 | #endif | |
1258 | } | |
1259 | ||
1260 | static void turbosparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
1261 | { | |
1262 | } | |
1263 | ||
1264 | static void turbosparc_flush_page_for_dma(unsigned long page) | |
1265 | { | |
1266 | turbosparc_flush_dcache(); | |
1267 | } | |
1268 | ||
1269 | static void turbosparc_flush_tlb_all(void) | |
1270 | { | |
1271 | srmmu_flush_whole_tlb(); | |
1272 | } | |
1273 | ||
1274 | static void turbosparc_flush_tlb_mm(struct mm_struct *mm) | |
1275 | { | |
1276 | FLUSH_BEGIN(mm) | |
1277 | srmmu_flush_whole_tlb(); | |
1278 | FLUSH_END | |
1279 | } | |
1280 | ||
1281 | static void turbosparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) | |
1282 | { | |
1283 | FLUSH_BEGIN(vma->vm_mm) | |
1284 | srmmu_flush_whole_tlb(); | |
1285 | FLUSH_END | |
1286 | } | |
1287 | ||
1288 | static void turbosparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
1289 | { | |
1290 | FLUSH_BEGIN(vma->vm_mm) | |
1291 | srmmu_flush_whole_tlb(); | |
1292 | FLUSH_END | |
1293 | } | |
1294 | ||
1295 | ||
2066aadd | 1296 | static void poke_turbosparc(void) |
1da177e4 LT |
1297 | { |
1298 | unsigned long mreg = srmmu_get_mmureg(); | |
1299 | unsigned long ccreg; | |
1300 | ||
1301 | /* Clear any crap from the cache or else... */ | |
1302 | turbosparc_flush_cache_all(); | |
605ae962 SR |
1303 | /* Temporarily disable I & D caches */ |
1304 | mreg &= ~(TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); | |
1da177e4 LT |
1305 | mreg &= ~(TURBOSPARC_PCENABLE); /* Don't check parity */ |
1306 | srmmu_set_mmureg(mreg); | |
605ae962 | 1307 | |
1da177e4 LT |
1308 | ccreg = turbosparc_get_ccreg(); |
1309 | ||
1310 | #ifdef TURBOSPARC_WRITEBACK | |
1311 | ccreg |= (TURBOSPARC_SNENABLE); /* Do DVMA snooping in Dcache */ | |
1312 | ccreg &= ~(TURBOSPARC_uS2 | TURBOSPARC_WTENABLE); | |
1313 | /* Write-back D-cache, emulate VLSI | |
1314 | * abortion number three, not number one */ | |
1315 | #else | |
1316 | /* For now let's play safe, optimize later */ | |
1317 | ccreg |= (TURBOSPARC_SNENABLE | TURBOSPARC_WTENABLE); | |
1318 | /* Do DVMA snooping in Dcache, Write-thru D-cache */ | |
1319 | ccreg &= ~(TURBOSPARC_uS2); | |
1320 | /* Emulate VLSI abortion number three, not number one */ | |
1321 | #endif | |
1322 | ||
1323 | switch (ccreg & 7) { | |
1324 | case 0: /* No SE cache */ | |
1325 | case 7: /* Test mode */ | |
1326 | break; | |
1327 | default: | |
1328 | ccreg |= (TURBOSPARC_SCENABLE); | |
1329 | } | |
605ae962 | 1330 | turbosparc_set_ccreg(ccreg); |
1da177e4 LT |
1331 | |
1332 | mreg |= (TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); /* I & D caches on */ | |
1333 | mreg |= (TURBOSPARC_ICSNOOP); /* Icache snooping on */ | |
1334 | srmmu_set_mmureg(mreg); | |
1335 | } | |
1336 | ||
5d83d666 DM |
1337 | static const struct sparc32_cachetlb_ops turbosparc_ops = { |
1338 | .cache_all = turbosparc_flush_cache_all, | |
1339 | .cache_mm = turbosparc_flush_cache_mm, | |
1340 | .cache_page = turbosparc_flush_cache_page, | |
1341 | .cache_range = turbosparc_flush_cache_range, | |
1342 | .tlb_all = turbosparc_flush_tlb_all, | |
1343 | .tlb_mm = turbosparc_flush_tlb_mm, | |
1344 | .tlb_page = turbosparc_flush_tlb_page, | |
1345 | .tlb_range = turbosparc_flush_tlb_range, | |
1346 | .page_to_ram = turbosparc_flush_page_to_ram, | |
1347 | .sig_insns = turbosparc_flush_sig_insns, | |
1348 | .page_for_dma = turbosparc_flush_page_for_dma, | |
1349 | }; | |
1350 | ||
1da177e4 LT |
1351 | static void __init init_turbosparc(void) |
1352 | { | |
1353 | srmmu_name = "Fujitsu TurboSparc"; | |
1354 | srmmu_modtype = TurboSparc; | |
5d83d666 | 1355 | sparc32_cachetlb_ops = &turbosparc_ops; |
1da177e4 LT |
1356 | poke_srmmu = poke_turbosparc; |
1357 | } | |
1358 | ||
2066aadd | 1359 | static void poke_tsunami(void) |
1da177e4 LT |
1360 | { |
1361 | unsigned long mreg = srmmu_get_mmureg(); | |
1362 | ||
1363 | tsunami_flush_icache(); | |
1364 | tsunami_flush_dcache(); | |
1365 | mreg &= ~TSUNAMI_ITD; | |
1366 | mreg |= (TSUNAMI_IENAB | TSUNAMI_DENAB); | |
1367 | srmmu_set_mmureg(mreg); | |
1368 | } | |
1369 | ||
5d83d666 DM |
1370 | static const struct sparc32_cachetlb_ops tsunami_ops = { |
1371 | .cache_all = tsunami_flush_cache_all, | |
1372 | .cache_mm = tsunami_flush_cache_mm, | |
1373 | .cache_page = tsunami_flush_cache_page, | |
1374 | .cache_range = tsunami_flush_cache_range, | |
1375 | .tlb_all = tsunami_flush_tlb_all, | |
1376 | .tlb_mm = tsunami_flush_tlb_mm, | |
1377 | .tlb_page = tsunami_flush_tlb_page, | |
1378 | .tlb_range = tsunami_flush_tlb_range, | |
1379 | .page_to_ram = tsunami_flush_page_to_ram, | |
1380 | .sig_insns = tsunami_flush_sig_insns, | |
1381 | .page_for_dma = tsunami_flush_page_for_dma, | |
1382 | }; | |
1383 | ||
1da177e4 LT |
1384 | static void __init init_tsunami(void) |
1385 | { | |
1386 | /* | |
1387 | * Tsunami's pretty sane, Sun and TI actually got it | |
1388 | * somewhat right this time. Fujitsu should have | |
1389 | * taken some lessons from them. | |
1390 | */ | |
1391 | ||
1392 | srmmu_name = "TI Tsunami"; | |
1393 | srmmu_modtype = Tsunami; | |
5d83d666 | 1394 | sparc32_cachetlb_ops = &tsunami_ops; |
1da177e4 LT |
1395 | poke_srmmu = poke_tsunami; |
1396 | ||
1397 | tsunami_setup_blockops(); | |
1398 | } | |
1399 | ||
2066aadd | 1400 | static void poke_viking(void) |
1da177e4 LT |
1401 | { |
1402 | unsigned long mreg = srmmu_get_mmureg(); | |
1403 | static int smp_catch; | |
1404 | ||
5d83d666 | 1405 | if (viking_mxcc_present) { |
1da177e4 LT |
1406 | unsigned long mxcc_control = mxcc_get_creg(); |
1407 | ||
1408 | mxcc_control |= (MXCC_CTL_ECE | MXCC_CTL_PRE | MXCC_CTL_MCE); | |
1409 | mxcc_control &= ~(MXCC_CTL_RRC); | |
1410 | mxcc_set_creg(mxcc_control); | |
1411 | ||
1412 | /* | |
1413 | * We don't need memory parity checks. | |
1414 | * XXX This is a mess, have to dig out later. ecd. | |
1415 | viking_mxcc_turn_off_parity(&mreg, &mxcc_control); | |
1416 | */ | |
1417 | ||
1418 | /* We do cache ptables on MXCC. */ | |
1419 | mreg |= VIKING_TCENABLE; | |
1420 | } else { | |
1421 | unsigned long bpreg; | |
1422 | ||
1423 | mreg &= ~(VIKING_TCENABLE); | |
605ae962 | 1424 | if (smp_catch++) { |
1da177e4 LT |
1425 | /* Must disable mixed-cmd mode here for other cpu's. */ |
1426 | bpreg = viking_get_bpreg(); | |
1427 | bpreg &= ~(VIKING_ACTION_MIX); | |
1428 | viking_set_bpreg(bpreg); | |
1429 | ||
1430 | /* Just in case PROM does something funny. */ | |
1431 | msi_set_sync(); | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | mreg |= VIKING_SPENABLE; | |
1436 | mreg |= (VIKING_ICENABLE | VIKING_DCENABLE); | |
1437 | mreg |= VIKING_SBENABLE; | |
1438 | mreg &= ~(VIKING_ACENABLE); | |
1439 | srmmu_set_mmureg(mreg); | |
1da177e4 LT |
1440 | } |
1441 | ||
5d83d666 DM |
1442 | static struct sparc32_cachetlb_ops viking_ops = { |
1443 | .cache_all = viking_flush_cache_all, | |
1444 | .cache_mm = viking_flush_cache_mm, | |
1445 | .cache_page = viking_flush_cache_page, | |
1446 | .cache_range = viking_flush_cache_range, | |
1447 | .tlb_all = viking_flush_tlb_all, | |
1448 | .tlb_mm = viking_flush_tlb_mm, | |
1449 | .tlb_page = viking_flush_tlb_page, | |
1450 | .tlb_range = viking_flush_tlb_range, | |
1451 | .page_to_ram = viking_flush_page_to_ram, | |
1452 | .sig_insns = viking_flush_sig_insns, | |
1453 | .page_for_dma = viking_flush_page_for_dma, | |
1454 | }; | |
1455 | ||
1456 | #ifdef CONFIG_SMP | |
1457 | /* On sun4d the cpu broadcasts local TLB flushes, so we can just | |
1458 | * perform the local TLB flush and all the other cpus will see it. | |
1459 | * But, unfortunately, there is a bug in the sun4d XBUS backplane | |
1460 | * that requires that we add some synchronization to these flushes. | |
1461 | * | |
1462 | * The bug is that the fifo which keeps track of all the pending TLB | |
1463 | * broadcasts in the system is an entry or two too small, so if we | |
1464 | * have too many going at once we'll overflow that fifo and lose a TLB | |
1465 | * flush resulting in corruption. | |
1466 | * | |
1467 | * Our workaround is to take a global spinlock around the TLB flushes, | |
1468 | * which guarentees we won't ever have too many pending. It's a big | |
1469 | * hammer, but a semaphore like system to make sure we only have N TLB | |
1470 | * flushes going at once will require SMP locking anyways so there's | |
1471 | * no real value in trying any harder than this. | |
1472 | */ | |
1473 | static struct sparc32_cachetlb_ops viking_sun4d_smp_ops = { | |
1474 | .cache_all = viking_flush_cache_all, | |
1475 | .cache_mm = viking_flush_cache_mm, | |
1476 | .cache_page = viking_flush_cache_page, | |
1477 | .cache_range = viking_flush_cache_range, | |
1478 | .tlb_all = sun4dsmp_flush_tlb_all, | |
1479 | .tlb_mm = sun4dsmp_flush_tlb_mm, | |
1480 | .tlb_page = sun4dsmp_flush_tlb_page, | |
1481 | .tlb_range = sun4dsmp_flush_tlb_range, | |
1482 | .page_to_ram = viking_flush_page_to_ram, | |
1483 | .sig_insns = viking_flush_sig_insns, | |
1484 | .page_for_dma = viking_flush_page_for_dma, | |
1485 | }; | |
1486 | #endif | |
1487 | ||
1da177e4 LT |
1488 | static void __init init_viking(void) |
1489 | { | |
1490 | unsigned long mreg = srmmu_get_mmureg(); | |
1491 | ||
1492 | /* Ahhh, the viking. SRMMU VLSI abortion number two... */ | |
605ae962 | 1493 | if (mreg & VIKING_MMODE) { |
1da177e4 LT |
1494 | srmmu_name = "TI Viking"; |
1495 | viking_mxcc_present = 0; | |
1496 | msi_set_sync(); | |
1497 | ||
1da177e4 LT |
1498 | /* |
1499 | * We need this to make sure old viking takes no hits | |
1500 | * on it's cache for dma snoops to workaround the | |
1501 | * "load from non-cacheable memory" interrupt bug. | |
1502 | * This is only necessary because of the new way in | |
1503 | * which we use the IOMMU. | |
1504 | */ | |
5d83d666 DM |
1505 | viking_ops.page_for_dma = viking_flush_page; |
1506 | #ifdef CONFIG_SMP | |
1507 | viking_sun4d_smp_ops.page_for_dma = viking_flush_page; | |
1508 | #endif | |
1da177e4 LT |
1509 | flush_page_for_dma_global = 0; |
1510 | } else { | |
1511 | srmmu_name = "TI Viking/MXCC"; | |
1512 | viking_mxcc_present = 1; | |
1da177e4 | 1513 | srmmu_cache_pagetables = 1; |
1da177e4 LT |
1514 | } |
1515 | ||
5d83d666 DM |
1516 | sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) |
1517 | &viking_ops; | |
1da177e4 | 1518 | #ifdef CONFIG_SMP |
5d83d666 DM |
1519 | if (sparc_cpu_model == sun4d) |
1520 | sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) | |
1521 | &viking_sun4d_smp_ops; | |
1da177e4 | 1522 | #endif |
1da177e4 LT |
1523 | |
1524 | poke_srmmu = poke_viking; | |
1525 | } | |
1526 | ||
1527 | /* Probe for the srmmu chip version. */ | |
1528 | static void __init get_srmmu_type(void) | |
1529 | { | |
1530 | unsigned long mreg, psr; | |
1531 | unsigned long mod_typ, mod_rev, psr_typ, psr_vers; | |
1532 | ||
1533 | srmmu_modtype = SRMMU_INVAL_MOD; | |
1534 | hwbug_bitmask = 0; | |
1535 | ||
1536 | mreg = srmmu_get_mmureg(); psr = get_psr(); | |
1537 | mod_typ = (mreg & 0xf0000000) >> 28; | |
1538 | mod_rev = (mreg & 0x0f000000) >> 24; | |
1539 | psr_typ = (psr >> 28) & 0xf; | |
1540 | psr_vers = (psr >> 24) & 0xf; | |
1541 | ||
75d9e346 KE |
1542 | /* First, check for sparc-leon. */ |
1543 | if (sparc_cpu_model == sparc_leon) { | |
75d9e346 KE |
1544 | init_leon(); |
1545 | return; | |
1546 | } | |
1547 | ||
1548 | /* Second, check for HyperSparc or Cypress. */ | |
605ae962 SR |
1549 | if (mod_typ == 1) { |
1550 | switch (mod_rev) { | |
1da177e4 LT |
1551 | case 7: |
1552 | /* UP or MP Hypersparc */ | |
1553 | init_hypersparc(); | |
1554 | break; | |
1555 | case 0: | |
1556 | case 2: | |
1da177e4 LT |
1557 | case 10: |
1558 | case 11: | |
1559 | case 12: | |
1da177e4 LT |
1560 | case 13: |
1561 | case 14: | |
1562 | case 15: | |
1da177e4 | 1563 | default: |
c7020eb4 DM |
1564 | prom_printf("Sparc-Linux Cypress support does not longer exit.\n"); |
1565 | prom_halt(); | |
1da177e4 | 1566 | break; |
6cb79b3f | 1567 | } |
1da177e4 LT |
1568 | return; |
1569 | } | |
605ae962 SR |
1570 | |
1571 | /* Now Fujitsu TurboSparc. It might happen that it is | |
1da177e4 LT |
1572 | * in Swift emulation mode, so we will check later... |
1573 | */ | |
1574 | if (psr_typ == 0 && psr_vers == 5) { | |
1575 | init_turbosparc(); | |
1576 | return; | |
1577 | } | |
1578 | ||
1579 | /* Next check for Fujitsu Swift. */ | |
605ae962 | 1580 | if (psr_typ == 0 && psr_vers == 4) { |
8d125562 | 1581 | phandle cpunode; |
1da177e4 LT |
1582 | char node_str[128]; |
1583 | ||
1584 | /* Look if it is not a TurboSparc emulating Swift... */ | |
1585 | cpunode = prom_getchild(prom_root_node); | |
605ae962 | 1586 | while ((cpunode = prom_getsibling(cpunode)) != 0) { |
1da177e4 | 1587 | prom_getstring(cpunode, "device_type", node_str, sizeof(node_str)); |
605ae962 | 1588 | if (!strcmp(node_str, "cpu")) { |
1da177e4 LT |
1589 | if (!prom_getintdefault(cpunode, "psr-implementation", 1) && |
1590 | prom_getintdefault(cpunode, "psr-version", 1) == 5) { | |
1591 | init_turbosparc(); | |
1592 | return; | |
1593 | } | |
1594 | break; | |
1595 | } | |
1596 | } | |
605ae962 | 1597 | |
1da177e4 LT |
1598 | init_swift(); |
1599 | return; | |
1600 | } | |
1601 | ||
1602 | /* Now the Viking family of srmmu. */ | |
605ae962 | 1603 | if (psr_typ == 4 && |
1da177e4 LT |
1604 | ((psr_vers == 0) || |
1605 | ((psr_vers == 1) && (mod_typ == 0) && (mod_rev == 0)))) { | |
1606 | init_viking(); | |
1607 | return; | |
1608 | } | |
1609 | ||
1610 | /* Finally the Tsunami. */ | |
605ae962 | 1611 | if (psr_typ == 4 && psr_vers == 1 && (mod_typ || mod_rev)) { |
1da177e4 LT |
1612 | init_tsunami(); |
1613 | return; | |
1614 | } | |
1615 | ||
1616 | /* Oh well */ | |
1617 | srmmu_is_bad(); | |
1618 | } | |
1619 | ||
1da177e4 LT |
1620 | #ifdef CONFIG_SMP |
1621 | /* Local cross-calls. */ | |
1622 | static void smp_flush_page_for_dma(unsigned long page) | |
1623 | { | |
5d83d666 DM |
1624 | xc1((smpfunc_t) local_ops->page_for_dma, page); |
1625 | local_ops->page_for_dma(page); | |
1626 | } | |
1627 | ||
1628 | static void smp_flush_cache_all(void) | |
1629 | { | |
1630 | xc0((smpfunc_t) local_ops->cache_all); | |
1631 | local_ops->cache_all(); | |
1632 | } | |
1633 | ||
1634 | static void smp_flush_tlb_all(void) | |
1635 | { | |
1636 | xc0((smpfunc_t) local_ops->tlb_all); | |
1637 | local_ops->tlb_all(); | |
1638 | } | |
1639 | ||
1640 | static void smp_flush_cache_mm(struct mm_struct *mm) | |
1641 | { | |
1642 | if (mm->context != NO_CONTEXT) { | |
1643 | cpumask_t cpu_mask; | |
1644 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1645 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1646 | if (!cpumask_empty(&cpu_mask)) | |
1647 | xc1((smpfunc_t) local_ops->cache_mm, (unsigned long) mm); | |
1648 | local_ops->cache_mm(mm); | |
1649 | } | |
1650 | } | |
1651 | ||
1652 | static void smp_flush_tlb_mm(struct mm_struct *mm) | |
1653 | { | |
1654 | if (mm->context != NO_CONTEXT) { | |
1655 | cpumask_t cpu_mask; | |
1656 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1657 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1658 | if (!cpumask_empty(&cpu_mask)) { | |
1659 | xc1((smpfunc_t) local_ops->tlb_mm, (unsigned long) mm); | |
1660 | if (atomic_read(&mm->mm_users) == 1 && current->active_mm == mm) | |
1661 | cpumask_copy(mm_cpumask(mm), | |
1662 | cpumask_of(smp_processor_id())); | |
1663 | } | |
1664 | local_ops->tlb_mm(mm); | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | static void smp_flush_cache_range(struct vm_area_struct *vma, | |
1669 | unsigned long start, | |
1670 | unsigned long end) | |
1671 | { | |
1672 | struct mm_struct *mm = vma->vm_mm; | |
1673 | ||
1674 | if (mm->context != NO_CONTEXT) { | |
1675 | cpumask_t cpu_mask; | |
1676 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1677 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1678 | if (!cpumask_empty(&cpu_mask)) | |
1679 | xc3((smpfunc_t) local_ops->cache_range, | |
1680 | (unsigned long) vma, start, end); | |
1681 | local_ops->cache_range(vma, start, end); | |
1682 | } | |
1683 | } | |
1684 | ||
1685 | static void smp_flush_tlb_range(struct vm_area_struct *vma, | |
1686 | unsigned long start, | |
1687 | unsigned long end) | |
1688 | { | |
1689 | struct mm_struct *mm = vma->vm_mm; | |
1690 | ||
1691 | if (mm->context != NO_CONTEXT) { | |
1692 | cpumask_t cpu_mask; | |
1693 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1694 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1695 | if (!cpumask_empty(&cpu_mask)) | |
1696 | xc3((smpfunc_t) local_ops->tlb_range, | |
1697 | (unsigned long) vma, start, end); | |
1698 | local_ops->tlb_range(vma, start, end); | |
1699 | } | |
1da177e4 LT |
1700 | } |
1701 | ||
5d83d666 DM |
1702 | static void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page) |
1703 | { | |
1704 | struct mm_struct *mm = vma->vm_mm; | |
1705 | ||
1706 | if (mm->context != NO_CONTEXT) { | |
1707 | cpumask_t cpu_mask; | |
1708 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1709 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1710 | if (!cpumask_empty(&cpu_mask)) | |
1711 | xc2((smpfunc_t) local_ops->cache_page, | |
1712 | (unsigned long) vma, page); | |
1713 | local_ops->cache_page(vma, page); | |
1714 | } | |
1715 | } | |
1716 | ||
1717 | static void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page) | |
1718 | { | |
1719 | struct mm_struct *mm = vma->vm_mm; | |
1720 | ||
1721 | if (mm->context != NO_CONTEXT) { | |
1722 | cpumask_t cpu_mask; | |
1723 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1724 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1725 | if (!cpumask_empty(&cpu_mask)) | |
1726 | xc2((smpfunc_t) local_ops->tlb_page, | |
1727 | (unsigned long) vma, page); | |
1728 | local_ops->tlb_page(vma, page); | |
1729 | } | |
1730 | } | |
1731 | ||
1732 | static void smp_flush_page_to_ram(unsigned long page) | |
1733 | { | |
1734 | /* Current theory is that those who call this are the one's | |
1735 | * who have just dirtied their cache with the pages contents | |
1736 | * in kernel space, therefore we only run this on local cpu. | |
1737 | * | |
1738 | * XXX This experiment failed, research further... -DaveM | |
1739 | */ | |
1740 | #if 1 | |
1741 | xc1((smpfunc_t) local_ops->page_to_ram, page); | |
1742 | #endif | |
1743 | local_ops->page_to_ram(page); | |
1744 | } | |
1745 | ||
1746 | static void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr) | |
1747 | { | |
1748 | cpumask_t cpu_mask; | |
1749 | cpumask_copy(&cpu_mask, mm_cpumask(mm)); | |
1750 | cpumask_clear_cpu(smp_processor_id(), &cpu_mask); | |
1751 | if (!cpumask_empty(&cpu_mask)) | |
1752 | xc2((smpfunc_t) local_ops->sig_insns, | |
1753 | (unsigned long) mm, insn_addr); | |
1754 | local_ops->sig_insns(mm, insn_addr); | |
1755 | } | |
1756 | ||
1757 | static struct sparc32_cachetlb_ops smp_cachetlb_ops = { | |
1758 | .cache_all = smp_flush_cache_all, | |
1759 | .cache_mm = smp_flush_cache_mm, | |
1760 | .cache_page = smp_flush_cache_page, | |
1761 | .cache_range = smp_flush_cache_range, | |
1762 | .tlb_all = smp_flush_tlb_all, | |
1763 | .tlb_mm = smp_flush_tlb_mm, | |
1764 | .tlb_page = smp_flush_tlb_page, | |
1765 | .tlb_range = smp_flush_tlb_range, | |
1766 | .page_to_ram = smp_flush_page_to_ram, | |
1767 | .sig_insns = smp_flush_sig_insns, | |
1768 | .page_for_dma = smp_flush_page_for_dma, | |
1769 | }; | |
1da177e4 LT |
1770 | #endif |
1771 | ||
1da177e4 | 1772 | /* Load up routines and constants for sun4m and sun4d mmu */ |
a3c5c663 | 1773 | void __init load_mmu(void) |
1da177e4 | 1774 | { |
1da177e4 | 1775 | /* Functions */ |
1da177e4 | 1776 | get_srmmu_type(); |
1da177e4 LT |
1777 | |
1778 | #ifdef CONFIG_SMP | |
1779 | /* El switcheroo... */ | |
5d83d666 | 1780 | local_ops = sparc32_cachetlb_ops; |
1da177e4 | 1781 | |
5d83d666 DM |
1782 | if (sparc_cpu_model == sun4d || sparc_cpu_model == sparc_leon) { |
1783 | smp_cachetlb_ops.tlb_all = local_ops->tlb_all; | |
1784 | smp_cachetlb_ops.tlb_mm = local_ops->tlb_mm; | |
1785 | smp_cachetlb_ops.tlb_range = local_ops->tlb_range; | |
1786 | smp_cachetlb_ops.tlb_page = local_ops->tlb_page; | |
1da177e4 | 1787 | } |
64273d08 DM |
1788 | |
1789 | if (poke_srmmu == poke_viking) { | |
1790 | /* Avoid unnecessary cross calls. */ | |
5d83d666 DM |
1791 | smp_cachetlb_ops.cache_all = local_ops->cache_all; |
1792 | smp_cachetlb_ops.cache_mm = local_ops->cache_mm; | |
1793 | smp_cachetlb_ops.cache_range = local_ops->cache_range; | |
1794 | smp_cachetlb_ops.cache_page = local_ops->cache_page; | |
1795 | ||
1796 | smp_cachetlb_ops.page_to_ram = local_ops->page_to_ram; | |
1797 | smp_cachetlb_ops.sig_insns = local_ops->sig_insns; | |
1798 | smp_cachetlb_ops.page_for_dma = local_ops->page_for_dma; | |
64273d08 | 1799 | } |
5d83d666 DM |
1800 | |
1801 | /* It really is const after this point. */ | |
1802 | sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *) | |
1803 | &smp_cachetlb_ops; | |
1da177e4 LT |
1804 | #endif |
1805 | ||
1806 | if (sparc_cpu_model == sun4d) | |
1807 | ld_mmu_iounit(); | |
1808 | else | |
1809 | ld_mmu_iommu(); | |
1810 | #ifdef CONFIG_SMP | |
1811 | if (sparc_cpu_model == sun4d) | |
1812 | sun4d_init_smp(); | |
8401707f KE |
1813 | else if (sparc_cpu_model == sparc_leon) |
1814 | leon_init_smp(); | |
1da177e4 LT |
1815 | else |
1816 | sun4m_init_smp(); | |
1817 | #endif | |
1818 | } |