blob: fec926021f4988e7d6799152eb42606c24600035 [file] [log] [blame]
Adrian Bunk88278ca2008-05-19 16:53:02 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#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>
Robert Reiff538f3d2008-07-14 22:57:29 -070025#include <linux/pagemap.h>
Robert Reif1aa03652008-09-03 16:29:42 -070026#include <linux/poison.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Sam Ravnborg86ed40b2008-12-27 00:35:12 -080028#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#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>
David S. Miller942a6bd2006-06-23 15:53:31 -070036#include <asm/prom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
39
40unsigned long *sparc_valid_addr_bitmap;
41
42unsigned long phys_base;
43unsigned long pfn_base;
44
45unsigned long page_kernel;
46
47struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
48unsigned long sparc_unmapped_base;
49
50struct pgtable_cache_struct pgt_quicklists;
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052/* Initial ramdisk setup */
53extern unsigned int sparc_ramdisk_image;
54extern unsigned int sparc_ramdisk_size;
55
56unsigned long highstart_pfn, highend_pfn;
57
58pte_t *kmap_pte;
59pgprot_t kmap_prot;
60
61#define kmap_get_fixmap_pte(vaddr) \
62 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
63
64void __init kmap_init(void)
65{
66 /* cache the first kmap pte */
67 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
68 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
69}
70
71void show_mem(void)
72{
73 printk("Mem-info:\n");
74 show_free_areas();
75 printk("Free swap: %6ldkB\n",
76 nr_swap_pages << (PAGE_SHIFT-10));
77 printk("%ld pages of RAM\n", totalram_pages);
Al Virof0f0d0c2007-03-14 09:18:50 +000078 printk("%ld free pages\n", nr_free_pages());
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#if 0 /* undefined pgtable_cache_size, pgd_cache_size */
80 printk("%ld pages in page table cache\n",pgtable_cache_size);
81#ifndef CONFIG_SMP
82 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
83 printk("%ld entries in page dir cache\n",pgd_cache_size);
84#endif
85#endif
86}
87
88void __init sparc_context_init(int numctx)
89{
90 int ctx;
91
92 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
93
94 for(ctx = 0; ctx < numctx; ctx++) {
95 struct ctx_list *clist;
96
97 clist = (ctx_list_pool + ctx);
98 clist->ctx_number = ctx;
99 clist->ctx_mm = NULL;
100 }
101 ctx_free.next = ctx_free.prev = &ctx_free;
102 ctx_used.next = ctx_used.prev = &ctx_used;
103 for(ctx = 0; ctx < numctx; ctx++)
104 add_to_free_ctxlist(ctx_list_pool + ctx);
105}
106
107extern unsigned long cmdline_memory_size;
108unsigned long last_valid_pfn;
109
110unsigned long calc_highpages(void)
111{
112 int i;
113 int nr = 0;
114
115 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
116 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
117 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
118
119 if (end_pfn <= max_low_pfn)
120 continue;
121
122 if (start_pfn < max_low_pfn)
123 start_pfn = max_low_pfn;
124
125 nr += end_pfn - start_pfn;
126 }
127
128 return nr;
129}
130
Adrian Bunk50215d62008-06-05 11:41:51 -0700131static unsigned long calc_max_low_pfn(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
133 int i;
134 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
135 unsigned long curr_pfn, last_pfn;
136
137 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
138 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
139 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
140
141 if (curr_pfn >= tmp) {
142 if (last_pfn < tmp)
143 tmp = last_pfn;
144 break;
145 }
146
147 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
148 }
149
150 return tmp;
151}
152
153unsigned long __init bootmem_init(unsigned long *pages_avail)
154{
155 unsigned long bootmap_size, start_pfn;
156 unsigned long end_of_phys_memory = 0UL;
157 unsigned long bootmap_pfn, bytes_avail, size;
158 int i;
159
160 bytes_avail = 0UL;
161 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
162 end_of_phys_memory = sp_banks[i].base_addr +
163 sp_banks[i].num_bytes;
164 bytes_avail += sp_banks[i].num_bytes;
165 if (cmdline_memory_size) {
166 if (bytes_avail > cmdline_memory_size) {
167 unsigned long slack = bytes_avail - cmdline_memory_size;
168
169 bytes_avail -= slack;
170 end_of_phys_memory -= slack;
171
172 sp_banks[i].num_bytes -= slack;
173 if (sp_banks[i].num_bytes == 0) {
174 sp_banks[i].base_addr = 0xdeadbeef;
175 } else {
176 sp_banks[i+1].num_bytes = 0;
177 sp_banks[i+1].base_addr = 0xdeadbeef;
178 }
179 break;
180 }
181 }
182 }
183
184 /* Start with page aligned address of last symbol in kernel
185 * image.
186 */
187 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
188
189 /* Now shift down to get the real physical page frame number. */
190 start_pfn >>= PAGE_SHIFT;
191
192 bootmap_pfn = start_pfn;
193
194 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
195
196 max_low_pfn = max_pfn;
197 highstart_pfn = highend_pfn = max_pfn;
198
199 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
200 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
201 max_low_pfn = calc_max_low_pfn();
202 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
203 calc_highpages() >> (20 - PAGE_SHIFT));
204 }
205
206#ifdef CONFIG_BLK_DEV_INITRD
207 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
208 if (sparc_ramdisk_image) {
David S. Millerefb896302007-08-20 15:52:18 -0700209 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
210 sparc_ramdisk_image -= KERNBASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 initrd_start = sparc_ramdisk_image + phys_base;
212 initrd_end = initrd_start + sparc_ramdisk_size;
213 if (initrd_end > end_of_phys_memory) {
214 printk(KERN_CRIT "initrd extends beyond end of memory "
215 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
216 initrd_end, end_of_phys_memory);
217 initrd_start = 0;
218 }
219 if (initrd_start) {
220 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
221 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
222 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
223 }
224 }
225#endif
226 /* Initialize the boot-time allocator. */
227 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
228 max_low_pfn);
229
230 /* Now register the available physical memory with the
231 * allocator.
232 */
233 *pages_avail = 0;
234 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
235 unsigned long curr_pfn, last_pfn;
236
237 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
238 if (curr_pfn >= max_low_pfn)
239 break;
240
241 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
242 if (last_pfn > max_low_pfn)
243 last_pfn = max_low_pfn;
244
245 /*
246 * .. finally, did all the rounding and playing
247 * around just make the area go away?
248 */
249 if (last_pfn <= curr_pfn)
250 continue;
251
252 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
253 *pages_avail += last_pfn - curr_pfn;
254
255 free_bootmem(sp_banks[i].base_addr, size);
256 }
257
258#ifdef CONFIG_BLK_DEV_INITRD
259 if (initrd_start) {
260 /* Reserve the initrd image area. */
261 size = initrd_end - initrd_start;
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800262 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
264
265 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
266 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
267 }
268#endif
269 /* Reserve the kernel text/data/bss. */
270 size = (start_pfn << PAGE_SHIFT) - phys_base;
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800271 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
273
274 /* Reserve the bootmem map. We do not account for it
275 * in pages_avail because we will release that memory
276 * in free_all_bootmem.
277 */
278 size = bootmap_size;
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800279 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
281
282 return max_pfn;
283}
284
285/*
286 * check_pgt_cache
287 *
288 * This is called at the end of unmapping of VMA (zap_page_range),
289 * to rescan the page cache for architecture specific things,
290 * presumably something like sun4/sun4c PMEGs. Most architectures
291 * define check_pgt_cache empty.
292 *
293 * We simply copy the 2.4 implementation for now.
294 */
Adrian Bunk50215d62008-06-05 11:41:51 -0700295static int pgt_cache_water[2] = { 25, 50 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297void check_pgt_cache(void)
298{
299 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
300}
301
302/*
303 * paging_init() sets up the page tables: We call the MMU specific
304 * init routine based upon the Sun model type on the Sparc.
305 *
306 */
307extern void sun4c_paging_init(void);
308extern void srmmu_paging_init(void);
309extern void device_scan(void);
310
Al Viro378e5152007-07-21 19:20:34 -0700311pgprot_t PAGE_SHARED __read_mostly;
312EXPORT_SYMBOL(PAGE_SHARED);
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314void __init paging_init(void)
315{
316 switch(sparc_cpu_model) {
317 case sun4c:
318 case sun4e:
319 case sun4:
320 sun4c_paging_init();
321 sparc_unmapped_base = 0xe0000000;
322 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
323 break;
324 case sun4m:
325 case sun4d:
326 srmmu_paging_init();
327 sparc_unmapped_base = 0x50000000;
328 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
329 break;
330 default:
331 prom_printf("paging_init: Cannot init paging on this Sparc\n");
332 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
333 prom_printf("paging_init: Halting...\n");
334 prom_halt();
335 };
336
337 /* Initialize the protection map with non-constant, MMU dependent values. */
338 protection_map[0] = PAGE_NONE;
339 protection_map[1] = PAGE_READONLY;
340 protection_map[2] = PAGE_COPY;
341 protection_map[3] = PAGE_COPY;
342 protection_map[4] = PAGE_READONLY;
343 protection_map[5] = PAGE_READONLY;
344 protection_map[6] = PAGE_COPY;
345 protection_map[7] = PAGE_COPY;
346 protection_map[8] = PAGE_NONE;
347 protection_map[9] = PAGE_READONLY;
348 protection_map[10] = PAGE_SHARED;
349 protection_map[11] = PAGE_SHARED;
350 protection_map[12] = PAGE_READONLY;
351 protection_map[13] = PAGE_READONLY;
352 protection_map[14] = PAGE_SHARED;
353 protection_map[15] = PAGE_SHARED;
354 btfixup();
David S. Miller942a6bd2006-06-23 15:53:31 -0700355 prom_build_devicetree();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 device_scan();
357}
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359static void __init taint_real_pages(void)
360{
361 int i;
362
363 for (i = 0; sp_banks[i].num_bytes; i++) {
364 unsigned long start, end;
365
366 start = sp_banks[i].base_addr;
367 end = start + sp_banks[i].num_bytes;
368
369 while (start < end) {
370 set_bit(start >> 20, sparc_valid_addr_bitmap);
371 start += PAGE_SIZE;
372 }
373 }
374}
375
Adrian Bunk50215d62008-06-05 11:41:51 -0700376static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
378 unsigned long tmp;
379
380#ifdef CONFIG_DEBUG_HIGHMEM
381 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
382#endif
383
384 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
385 struct page *page = pfn_to_page(tmp);
386
387 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800388 init_page_count(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 __free_page(page);
390 totalhigh_pages++;
391 }
392}
393
394void __init mem_init(void)
395{
396 int codepages = 0;
397 int datapages = 0;
398 int initpages = 0;
399 int reservedpages = 0;
400 int i;
401
402 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
403 prom_printf("BUG: fixmap and pkmap areas overlap\n");
404 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
405 PKMAP_BASE,
406 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
407 FIXADDR_START);
408 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
409 prom_halt();
410 }
411
412
413 /* Saves us work later. */
414 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
415
416 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
417 i += 1;
418 sparc_valid_addr_bitmap = (unsigned long *)
419 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
420
421 if (sparc_valid_addr_bitmap == NULL) {
422 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
423 prom_halt();
424 }
425 memset(sparc_valid_addr_bitmap, 0, i << 2);
426
427 taint_real_pages();
428
429 max_mapnr = last_valid_pfn - pfn_base;
430 high_memory = __va(max_low_pfn << PAGE_SHIFT);
431
432 totalram_pages = free_all_bootmem();
433
434 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
435 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
436 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
437
438 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
439
440 if (end_pfn <= highstart_pfn)
441 continue;
442
443 if (start_pfn < highstart_pfn)
444 start_pfn = highstart_pfn;
445
446 map_high_region(start_pfn, end_pfn);
447 }
448
449 totalram_pages += totalhigh_pages;
450
Sam Ravnborg86ed40b2008-12-27 00:35:12 -0800451 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
Sam Ravnborg86ed40b2008-12-27 00:35:12 -0800453 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
455 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
456 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
457
458 /* Ignore memory holes for the purpose of counting reserved pages */
459 for (i=0; i < max_low_pfn; i++)
460 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
461 && PageReserved(pfn_to_page(i)))
462 reservedpages++;
463
464 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
465 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
466 num_physpages << (PAGE_SHIFT - 10),
467 codepages << (PAGE_SHIFT-10),
468 reservedpages << (PAGE_SHIFT - 10),
469 datapages << (PAGE_SHIFT-10),
470 initpages << (PAGE_SHIFT-10),
471 totalhigh_pages << (PAGE_SHIFT-10));
472}
473
474void free_initmem (void)
475{
476 unsigned long addr;
Sam Ravnborg86ed40b2008-12-27 00:35:12 -0800477 unsigned long freed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 addr = (unsigned long)(&__init_begin);
Sam Ravnborg86ed40b2008-12-27 00:35:12 -0800480 freed = (unsigned long)(&__init_end) - addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
482 struct page *p;
483
Robert Reif1aa03652008-09-03 16:29:42 -0700484 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 p = virt_to_page(addr);
486
487 ClearPageReserved(p);
Nick Piggin7835e982006-03-22 00:08:40 -0800488 init_page_count(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 __free_page(p);
490 totalram_pages++;
491 num_physpages++;
492 }
Sam Ravnborg86ed40b2008-12-27 00:35:12 -0800493 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
494 freed >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495}
496
497#ifdef CONFIG_BLK_DEV_INITRD
498void free_initrd_mem(unsigned long start, unsigned long end)
499{
500 if (start < end)
Robert Reif1aa03652008-09-03 16:29:42 -0700501 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
502 (end - start) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 for (; start < end; start += PAGE_SIZE) {
Robert Reif1aa03652008-09-03 16:29:42 -0700504 struct page *p;
505
506 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
507 p = virt_to_page(start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 ClearPageReserved(p);
Nick Piggin7835e982006-03-22 00:08:40 -0800510 init_page_count(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 __free_page(p);
Robert Reif1aa03652008-09-03 16:29:42 -0700512 totalram_pages++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 num_physpages++;
514 }
515}
516#endif
517
518void sparc_flush_page_to_ram(struct page *page)
519{
520 unsigned long vaddr = (unsigned long)page_address(page);
521
522 if (vaddr)
523 __flush_page_to_ram(vaddr);
524}