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OMAP3: SR: Wait for VP idle before a VP disable
[linux-ginger.git] / arch / sparc / mm / init_32.c
blobdc7c3b17a15f2badfbdc03dc3a1c2cac77ed0818
1 /*
2 * linux/arch/sparc/mm/init.c
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
8 */
9
10 #include <linux/module.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/ptrace.h>
18 #include <linux/mman.h>
19 #include <linux/mm.h>
20 #include <linux/swap.h>
21 #include <linux/initrd.h>
22 #include <linux/init.h>
23 #include <linux/highmem.h>
24 #include <linux/bootmem.h>
25 #include <linux/pagemap.h>
26 #include <linux/poison.h>
27
28 #include <asm/sections.h>
29 #include <asm/system.h>
30 #include <asm/vac-ops.h>
31 #include <asm/page.h>
32 #include <asm/pgtable.h>
33 #include <asm/vaddrs.h>
34 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
35 #include <asm/tlb.h>
36 #include <asm/prom.h>
37 #include <asm/leon.h>
38
39 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
40
41 unsigned long *sparc_valid_addr_bitmap;
42 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
43
44 unsigned long phys_base;
45 EXPORT_SYMBOL(phys_base);
46
47 unsigned long pfn_base;
48 EXPORT_SYMBOL(pfn_base);
49
50 unsigned long page_kernel;
51 EXPORT_SYMBOL(page_kernel);
52
53 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
54 unsigned long sparc_unmapped_base;
55
56 struct pgtable_cache_struct pgt_quicklists;
57
58 /* Initial ramdisk setup */
59 extern unsigned int sparc_ramdisk_image;
60 extern unsigned int sparc_ramdisk_size;
61
62 unsigned long highstart_pfn, highend_pfn;
63
64 pte_t *kmap_pte;
65 pgprot_t kmap_prot;
66
67 #define kmap_get_fixmap_pte(vaddr) \
68 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
69
70 void __init kmap_init(void)
71 {
72 /* cache the first kmap pte */
73 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
74 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
75 }
76
77 void show_mem(void)
78 {
79 printk("Mem-info:\n");
80 show_free_areas();
81 printk("Free swap: %6ldkB\n",
82 nr_swap_pages << (PAGE_SHIFT-10));
83 printk("%ld pages of RAM\n", totalram_pages);
84 printk("%ld free pages\n", nr_free_pages());
85 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
86 printk("%ld pages in page table cache\n",pgtable_cache_size);
87 #ifndef CONFIG_SMP
88 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
89 printk("%ld entries in page dir cache\n",pgd_cache_size);
90 #endif
91 #endif
92 }
93
94 void __init sparc_context_init(int numctx)
95 {
96 int ctx;
97
98 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
99
100 for(ctx = 0; ctx < numctx; ctx++) {
101 struct ctx_list *clist;
102
103 clist = (ctx_list_pool + ctx);
104 clist->ctx_number = ctx;
105 clist->ctx_mm = NULL;
106 }
107 ctx_free.next = ctx_free.prev = &ctx_free;
108 ctx_used.next = ctx_used.prev = &ctx_used;
109 for(ctx = 0; ctx < numctx; ctx++)
110 add_to_free_ctxlist(ctx_list_pool + ctx);
111 }
112
113 extern unsigned long cmdline_memory_size;
114 unsigned long last_valid_pfn;
115
116 unsigned long calc_highpages(void)
117 {
118 int i;
119 int nr = 0;
120
121 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
122 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
123 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
124
125 if (end_pfn <= max_low_pfn)
126 continue;
127
128 if (start_pfn < max_low_pfn)
129 start_pfn = max_low_pfn;
130
131 nr += end_pfn - start_pfn;
132 }
133
134 return nr;
135 }
136
137 static unsigned long calc_max_low_pfn(void)
138 {
139 int i;
140 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
141 unsigned long curr_pfn, last_pfn;
142
143 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
144 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
145 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
146
147 if (curr_pfn >= tmp) {
148 if (last_pfn < tmp)
149 tmp = last_pfn;
150 break;
151 }
152
153 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
154 }
155
156 return tmp;
157 }
158
159 unsigned long __init bootmem_init(unsigned long *pages_avail)
160 {
161 unsigned long bootmap_size, start_pfn;
162 unsigned long end_of_phys_memory = 0UL;
163 unsigned long bootmap_pfn, bytes_avail, size;
164 int i;
165
166 bytes_avail = 0UL;
167 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
168 end_of_phys_memory = sp_banks[i].base_addr +
169 sp_banks[i].num_bytes;
170 bytes_avail += sp_banks[i].num_bytes;
171 if (cmdline_memory_size) {
172 if (bytes_avail > cmdline_memory_size) {
173 unsigned long slack = bytes_avail - cmdline_memory_size;
174
175 bytes_avail -= slack;
176 end_of_phys_memory -= slack;
177
178 sp_banks[i].num_bytes -= slack;
179 if (sp_banks[i].num_bytes == 0) {
180 sp_banks[i].base_addr = 0xdeadbeef;
181 } else {
182 sp_banks[i+1].num_bytes = 0;
183 sp_banks[i+1].base_addr = 0xdeadbeef;
184 }
185 break;
186 }
187 }
188 }
189
190 /* Start with page aligned address of last symbol in kernel
191 * image.
192 */
193 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
194
195 /* Now shift down to get the real physical page frame number. */
196 start_pfn >>= PAGE_SHIFT;
197
198 bootmap_pfn = start_pfn;
199
200 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
201
202 max_low_pfn = max_pfn;
203 highstart_pfn = highend_pfn = max_pfn;
204
205 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
206 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
207 max_low_pfn = calc_max_low_pfn();
208 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
209 calc_highpages() >> (20 - PAGE_SHIFT));
210 }
211
212 #ifdef CONFIG_BLK_DEV_INITRD
213 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
214 if (sparc_ramdisk_image) {
215 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
216 sparc_ramdisk_image -= KERNBASE;
217 initrd_start = sparc_ramdisk_image + phys_base;
218 initrd_end = initrd_start + sparc_ramdisk_size;
219 if (initrd_end > end_of_phys_memory) {
220 printk(KERN_CRIT "initrd extends beyond end of memory "
221 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
222 initrd_end, end_of_phys_memory);
223 initrd_start = 0;
224 }
225 if (initrd_start) {
226 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
227 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
228 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
229 }
230 }
231 #endif
232 /* Initialize the boot-time allocator. */
233 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
234 max_low_pfn);
235
236 /* Now register the available physical memory with the
237 * allocator.
238 */
239 *pages_avail = 0;
240 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
241 unsigned long curr_pfn, last_pfn;
242
243 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
244 if (curr_pfn >= max_low_pfn)
245 break;
246
247 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
248 if (last_pfn > max_low_pfn)
249 last_pfn = max_low_pfn;
250
251 /*
252 * .. finally, did all the rounding and playing
253 * around just make the area go away?
254 */
255 if (last_pfn <= curr_pfn)
256 continue;
257
258 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
259 *pages_avail += last_pfn - curr_pfn;
260
261 free_bootmem(sp_banks[i].base_addr, size);
262 }
263
264 #ifdef CONFIG_BLK_DEV_INITRD
265 if (initrd_start) {
266 /* Reserve the initrd image area. */
267 size = initrd_end - initrd_start;
268 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
269 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
270
271 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
272 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
273 }
274 #endif
275 /* Reserve the kernel text/data/bss. */
276 size = (start_pfn << PAGE_SHIFT) - phys_base;
277 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
278 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
279
280 /* Reserve the bootmem map. We do not account for it
281 * in pages_avail because we will release that memory
282 * in free_all_bootmem.
283 */
284 size = bootmap_size;
285 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
286 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
287
288 return max_pfn;
289 }
290
291 /*
292 * check_pgt_cache
293 *
294 * This is called at the end of unmapping of VMA (zap_page_range),
295 * to rescan the page cache for architecture specific things,
296 * presumably something like sun4/sun4c PMEGs. Most architectures
297 * define check_pgt_cache empty.
298 *
299 * We simply copy the 2.4 implementation for now.
300 */
301 static int pgt_cache_water[2] = { 25, 50 };
302
303 void check_pgt_cache(void)
304 {
305 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
306 }
307
308 /*
309 * paging_init() sets up the page tables: We call the MMU specific
310 * init routine based upon the Sun model type on the Sparc.
311 *
312 */
313 extern void sun4c_paging_init(void);
314 extern void srmmu_paging_init(void);
315 extern void device_scan(void);
316
317 pgprot_t PAGE_SHARED __read_mostly;
318 EXPORT_SYMBOL(PAGE_SHARED);
319
320 void __init paging_init(void)
321 {
322 switch(sparc_cpu_model) {
323 case sun4c:
324 case sun4e:
325 case sun4:
326 sun4c_paging_init();
327 sparc_unmapped_base = 0xe0000000;
328 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
329 break;
330 case sparc_leon:
331 leon_init();
332 /* fall through */
333 case sun4m:
334 case sun4d:
335 srmmu_paging_init();
336 sparc_unmapped_base = 0x50000000;
337 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
338 break;
339 default:
340 prom_printf("paging_init: Cannot init paging on this Sparc\n");
341 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
342 prom_printf("paging_init: Halting...\n");
343 prom_halt();
344 };
345
346 /* Initialize the protection map with non-constant, MMU dependent values. */
347 protection_map[0] = PAGE_NONE;
348 protection_map[1] = PAGE_READONLY;
349 protection_map[2] = PAGE_COPY;
350 protection_map[3] = PAGE_COPY;
351 protection_map[4] = PAGE_READONLY;
352 protection_map[5] = PAGE_READONLY;
353 protection_map[6] = PAGE_COPY;
354 protection_map[7] = PAGE_COPY;
355 protection_map[8] = PAGE_NONE;
356 protection_map[9] = PAGE_READONLY;
357 protection_map[10] = PAGE_SHARED;
358 protection_map[11] = PAGE_SHARED;
359 protection_map[12] = PAGE_READONLY;
360 protection_map[13] = PAGE_READONLY;
361 protection_map[14] = PAGE_SHARED;
362 protection_map[15] = PAGE_SHARED;
363 btfixup();
364 prom_build_devicetree();
365 of_fill_in_cpu_data();
366 device_scan();
367 }
368
369 static void __init taint_real_pages(void)
370 {
371 int i;
372
373 for (i = 0; sp_banks[i].num_bytes; i++) {
374 unsigned long start, end;
375
376 start = sp_banks[i].base_addr;
377 end = start + sp_banks[i].num_bytes;
378
379 while (start < end) {
380 set_bit(start >> 20, sparc_valid_addr_bitmap);
381 start += PAGE_SIZE;
382 }
383 }
384 }
385
386 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
387 {
388 unsigned long tmp;
389
390 #ifdef CONFIG_DEBUG_HIGHMEM
391 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
392 #endif
393
394 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
395 struct page *page = pfn_to_page(tmp);
396
397 ClearPageReserved(page);
398 init_page_count(page);
399 __free_page(page);
400 totalhigh_pages++;
401 }
402 }
403
404 void __init mem_init(void)
405 {
406 int codepages = 0;
407 int datapages = 0;
408 int initpages = 0;
409 int reservedpages = 0;
410 int i;
411
412 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
413 prom_printf("BUG: fixmap and pkmap areas overlap\n");
414 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
415 PKMAP_BASE,
416 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
417 FIXADDR_START);
418 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
419 prom_halt();
420 }
421
422
423 /* Saves us work later. */
424 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
425
426 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
427 i += 1;
428 sparc_valid_addr_bitmap = (unsigned long *)
429 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
430
431 if (sparc_valid_addr_bitmap == NULL) {
432 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
433 prom_halt();
434 }
435 memset(sparc_valid_addr_bitmap, 0, i << 2);
436
437 taint_real_pages();
438
439 max_mapnr = last_valid_pfn - pfn_base;
440 high_memory = __va(max_low_pfn << PAGE_SHIFT);
441
442 totalram_pages = free_all_bootmem();
443
444 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
445 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
446 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
447
448 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
449
450 if (end_pfn <= highstart_pfn)
451 continue;
452
453 if (start_pfn < highstart_pfn)
454 start_pfn = highstart_pfn;
455
456 map_high_region(start_pfn, end_pfn);
457 }
458
459 totalram_pages += totalhigh_pages;
460
461 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
462 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
463 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
464 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
465 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
466 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
467
468 /* Ignore memory holes for the purpose of counting reserved pages */
469 for (i=0; i < max_low_pfn; i++)
470 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
471 && PageReserved(pfn_to_page(i)))
472 reservedpages++;
473
474 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
475 nr_free_pages() << (PAGE_SHIFT-10),
476 num_physpages << (PAGE_SHIFT - 10),
477 codepages << (PAGE_SHIFT-10),
478 reservedpages << (PAGE_SHIFT - 10),
479 datapages << (PAGE_SHIFT-10),
480 initpages << (PAGE_SHIFT-10),
481 totalhigh_pages << (PAGE_SHIFT-10));
482 }
483
484 void free_initmem (void)
485 {
486 unsigned long addr;
487 unsigned long freed;
488
489 addr = (unsigned long)(&__init_begin);
490 freed = (unsigned long)(&__init_end) - addr;
491 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
492 struct page *p;
493
494 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
495 p = virt_to_page(addr);
496
497 ClearPageReserved(p);
498 init_page_count(p);
499 __free_page(p);
500 totalram_pages++;
501 num_physpages++;
502 }
503 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
504 freed >> 10);
505 }
506
507 #ifdef CONFIG_BLK_DEV_INITRD
508 void free_initrd_mem(unsigned long start, unsigned long end)
509 {
510 if (start < end)
511 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
512 (end - start) >> 10);
513 for (; start < end; start += PAGE_SIZE) {
514 struct page *p;
515
516 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
517 p = virt_to_page(start);
518
519 ClearPageReserved(p);
520 init_page_count(p);
521 __free_page(p);
522 totalram_pages++;
523 num_physpages++;
524 }
525 }
526 #endif
527
528 void sparc_flush_page_to_ram(struct page *page)
529 {
530 unsigned long vaddr = (unsigned long)page_address(page);
531
532 if (vaddr)
533 __flush_page_to_ram(vaddr);
534 }
535 EXPORT_SYMBOL(sparc_flush_page_to_ram);
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