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Linux 2.6.13-rc4
[linux-2.6/next.git] / arch / sparc / mm / init.c
blobec2e05028a10d7ff7804ef912833942e1e0fd20a
1 /* $Id: init.c,v 1.103 2001/11/19 19:03:08 davem Exp $
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/config.h>
11 #include <linux/module.h>
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18 #include <linux/ptrace.h>
19 #include <linux/mman.h>
20 #include <linux/mm.h>
21 #include <linux/swap.h>
22 #include <linux/initrd.h>
23 #include <linux/init.h>
24 #include <linux/highmem.h>
25 #include <linux/bootmem.h>
26
27 #include <asm/system.h>
28 #include <asm/segment.h>
29 #include <asm/vac-ops.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32 #include <asm/vaddrs.h>
33 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
34 #include <asm/tlb.h>
35
36 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
37
38 unsigned long *sparc_valid_addr_bitmap;
39
40 unsigned long phys_base;
41 unsigned long pfn_base;
42
43 unsigned long page_kernel;
44
45 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
46 unsigned long sparc_unmapped_base;
47
48 struct pgtable_cache_struct pgt_quicklists;
49
50 /* References to section boundaries */
51 extern char __init_begin, __init_end, _start, _end, etext , edata;
52
53 /* Initial ramdisk setup */
54 extern unsigned int sparc_ramdisk_image;
55 extern unsigned int sparc_ramdisk_size;
56
57 unsigned long highstart_pfn, highend_pfn;
58
59 pte_t *kmap_pte;
60 pgprot_t kmap_prot;
61
62 #define kmap_get_fixmap_pte(vaddr) \
63 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
64
65 void __init kmap_init(void)
66 {
67 /* cache the first kmap pte */
68 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
69 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
70 }
71
72 void show_mem(void)
73 {
74 printk("Mem-info:\n");
75 show_free_areas();
76 printk("Free swap: %6ldkB\n",
77 nr_swap_pages << (PAGE_SHIFT-10));
78 printk("%ld pages of RAM\n", totalram_pages);
79 printk("%d free pages\n", nr_free_pages());
80 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
81 printk("%ld pages in page table cache\n",pgtable_cache_size);
82 #ifndef CONFIG_SMP
83 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
84 printk("%ld entries in page dir cache\n",pgd_cache_size);
85 #endif
86 #endif
87 }
88
89 void __init sparc_context_init(int numctx)
90 {
91 int ctx;
92
93 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
94
95 for(ctx = 0; ctx < numctx; ctx++) {
96 struct ctx_list *clist;
97
98 clist = (ctx_list_pool + ctx);
99 clist->ctx_number = ctx;
100 clist->ctx_mm = NULL;
101 }
102 ctx_free.next = ctx_free.prev = &ctx_free;
103 ctx_used.next = ctx_used.prev = &ctx_used;
104 for(ctx = 0; ctx < numctx; ctx++)
105 add_to_free_ctxlist(ctx_list_pool + ctx);
106 }
107
108 extern unsigned long cmdline_memory_size;
109 unsigned long last_valid_pfn;
110
111 unsigned long calc_highpages(void)
112 {
113 int i;
114 int nr = 0;
115
116 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
117 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
118 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
119
120 if (end_pfn <= max_low_pfn)
121 continue;
122
123 if (start_pfn < max_low_pfn)
124 start_pfn = max_low_pfn;
125
126 nr += end_pfn - start_pfn;
127 }
128
129 return nr;
130 }
131
132 unsigned long calc_max_low_pfn(void)
133 {
134 int i;
135 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
136 unsigned long curr_pfn, last_pfn;
137
138 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
139 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
140 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
141
142 if (curr_pfn >= tmp) {
143 if (last_pfn < tmp)
144 tmp = last_pfn;
145 break;
146 }
147
148 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
149 }
150
151 return tmp;
152 }
153
154 unsigned long __init bootmem_init(unsigned long *pages_avail)
155 {
156 unsigned long bootmap_size, start_pfn;
157 unsigned long end_of_phys_memory = 0UL;
158 unsigned long bootmap_pfn, bytes_avail, size;
159 int i;
160
161 bytes_avail = 0UL;
162 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
163 end_of_phys_memory = sp_banks[i].base_addr +
164 sp_banks[i].num_bytes;
165 bytes_avail += sp_banks[i].num_bytes;
166 if (cmdline_memory_size) {
167 if (bytes_avail > cmdline_memory_size) {
168 unsigned long slack = bytes_avail - cmdline_memory_size;
169
170 bytes_avail -= slack;
171 end_of_phys_memory -= slack;
172
173 sp_banks[i].num_bytes -= slack;
174 if (sp_banks[i].num_bytes == 0) {
175 sp_banks[i].base_addr = 0xdeadbeef;
176 } else {
177 sp_banks[i+1].num_bytes = 0;
178 sp_banks[i+1].base_addr = 0xdeadbeef;
179 }
180 break;
181 }
182 }
183 }
184
185 /* Start with page aligned address of last symbol in kernel
186 * image.
187 */
188 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
189
190 /* Now shift down to get the real physical page frame number. */
191 start_pfn >>= PAGE_SHIFT;
192
193 bootmap_pfn = start_pfn;
194
195 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
196
197 max_low_pfn = max_pfn;
198 highstart_pfn = highend_pfn = max_pfn;
199
200 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
201 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
202 max_low_pfn = calc_max_low_pfn();
203 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
204 calc_highpages() >> (20 - PAGE_SHIFT));
205 }
206
207 #ifdef CONFIG_BLK_DEV_INITRD
208 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
209 if (sparc_ramdisk_image) {
210 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
211 sparc_ramdisk_image -= KERNBASE;
212 initrd_start = sparc_ramdisk_image + phys_base;
213 initrd_end = initrd_start + sparc_ramdisk_size;
214 if (initrd_end > end_of_phys_memory) {
215 printk(KERN_CRIT "initrd extends beyond end of memory "
216 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
217 initrd_end, end_of_phys_memory);
218 initrd_start = 0;
219 }
220 if (initrd_start) {
221 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
222 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
223 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
224 }
225 }
226 #endif
227 /* Initialize the boot-time allocator. */
228 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
229 max_low_pfn);
230
231 /* Now register the available physical memory with the
232 * allocator.
233 */
234 *pages_avail = 0;
235 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
236 unsigned long curr_pfn, last_pfn;
237
238 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
239 if (curr_pfn >= max_low_pfn)
240 break;
241
242 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
243 if (last_pfn > max_low_pfn)
244 last_pfn = max_low_pfn;
245
246 /*
247 * .. finally, did all the rounding and playing
248 * around just make the area go away?
249 */
250 if (last_pfn <= curr_pfn)
251 continue;
252
253 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
254 *pages_avail += last_pfn - curr_pfn;
255
256 free_bootmem(sp_banks[i].base_addr, size);
257 }
258
259 #ifdef CONFIG_BLK_DEV_INITRD
260 if (initrd_start) {
261 /* Reserve the initrd image area. */
262 size = initrd_end - initrd_start;
263 reserve_bootmem(initrd_start, size);
264 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
265
266 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
267 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
268 }
269 #endif
270 /* Reserve the kernel text/data/bss. */
271 size = (start_pfn << PAGE_SHIFT) - phys_base;
272 reserve_bootmem(phys_base, size);
273 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
274
275 /* Reserve the bootmem map. We do not account for it
276 * in pages_avail because we will release that memory
277 * in free_all_bootmem.
278 */
279 size = bootmap_size;
280 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
281 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
282
283 return max_pfn;
284 }
285
286 /*
287 * check_pgt_cache
288 *
289 * This is called at the end of unmapping of VMA (zap_page_range),
290 * to rescan the page cache for architecture specific things,
291 * presumably something like sun4/sun4c PMEGs. Most architectures
292 * define check_pgt_cache empty.
293 *
294 * We simply copy the 2.4 implementation for now.
295 */
296 int pgt_cache_water[2] = { 25, 50 };
297
298 void check_pgt_cache(void)
299 {
300 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
301 }
302
303 /*
304 * paging_init() sets up the page tables: We call the MMU specific
305 * init routine based upon the Sun model type on the Sparc.
306 *
307 */
308 extern void sun4c_paging_init(void);
309 extern void srmmu_paging_init(void);
310 extern void device_scan(void);
311
312 void __init paging_init(void)
313 {
314 switch(sparc_cpu_model) {
315 case sun4c:
316 case sun4e:
317 case sun4:
318 sun4c_paging_init();
319 sparc_unmapped_base = 0xe0000000;
320 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
321 break;
322 case sun4m:
323 case sun4d:
324 srmmu_paging_init();
325 sparc_unmapped_base = 0x50000000;
326 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
327 break;
328 default:
329 prom_printf("paging_init: Cannot init paging on this Sparc\n");
330 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
331 prom_printf("paging_init: Halting...\n");
332 prom_halt();
333 };
334
335 /* Initialize the protection map with non-constant, MMU dependent values. */
336 protection_map[0] = PAGE_NONE;
337 protection_map[1] = PAGE_READONLY;
338 protection_map[2] = PAGE_COPY;
339 protection_map[3] = PAGE_COPY;
340 protection_map[4] = PAGE_READONLY;
341 protection_map[5] = PAGE_READONLY;
342 protection_map[6] = PAGE_COPY;
343 protection_map[7] = PAGE_COPY;
344 protection_map[8] = PAGE_NONE;
345 protection_map[9] = PAGE_READONLY;
346 protection_map[10] = PAGE_SHARED;
347 protection_map[11] = PAGE_SHARED;
348 protection_map[12] = PAGE_READONLY;
349 protection_map[13] = PAGE_READONLY;
350 protection_map[14] = PAGE_SHARED;
351 protection_map[15] = PAGE_SHARED;
352 btfixup();
353 device_scan();
354 }
355
356 struct cache_palias *sparc_aliases;
357
358 static void __init taint_real_pages(void)
359 {
360 int i;
361
362 for (i = 0; sp_banks[i].num_bytes; i++) {
363 unsigned long start, end;
364
365 start = sp_banks[i].base_addr;
366 end = start + sp_banks[i].num_bytes;
367
368 while (start < end) {
369 set_bit(start >> 20, sparc_valid_addr_bitmap);
370 start += PAGE_SIZE;
371 }
372 }
373 }
374
375 void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
376 {
377 unsigned long tmp;
378
379 #ifdef CONFIG_DEBUG_HIGHMEM
380 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
381 #endif
382
383 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
384 struct page *page = pfn_to_page(tmp);
385
386 ClearPageReserved(page);
387 set_page_count(page, 1);
388 __free_page(page);
389 totalhigh_pages++;
390 }
391 }
392
393 void __init mem_init(void)
394 {
395 int codepages = 0;
396 int datapages = 0;
397 int initpages = 0;
398 int reservedpages = 0;
399 int i;
400
401 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
402 prom_printf("BUG: fixmap and pkmap areas overlap\n");
403 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
404 PKMAP_BASE,
405 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
406 FIXADDR_START);
407 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
408 prom_halt();
409 }
410
411
412 /* Saves us work later. */
413 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
414
415 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
416 i += 1;
417 sparc_valid_addr_bitmap = (unsigned long *)
418 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
419
420 if (sparc_valid_addr_bitmap == NULL) {
421 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
422 prom_halt();
423 }
424 memset(sparc_valid_addr_bitmap, 0, i << 2);
425
426 taint_real_pages();
427
428 max_mapnr = last_valid_pfn - pfn_base;
429 high_memory = __va(max_low_pfn << PAGE_SHIFT);
430
431 totalram_pages = free_all_bootmem();
432
433 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
434 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
435 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
436
437 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
438
439 if (end_pfn <= highstart_pfn)
440 continue;
441
442 if (start_pfn < highstart_pfn)
443 start_pfn = highstart_pfn;
444
445 map_high_region(start_pfn, end_pfn);
446 }
447
448 totalram_pages += totalhigh_pages;
449
450 codepages = (((unsigned long) &etext) - ((unsigned long)&_start));
451 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
452 datapages = (((unsigned long) &edata) - ((unsigned long)&etext));
453 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
454 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
455 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
456
457 /* Ignore memory holes for the purpose of counting reserved pages */
458 for (i=0; i < max_low_pfn; i++)
459 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
460 && PageReserved(pfn_to_page(i)))
461 reservedpages++;
462
463 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
464 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
465 num_physpages << (PAGE_SHIFT - 10),
466 codepages << (PAGE_SHIFT-10),
467 reservedpages << (PAGE_SHIFT - 10),
468 datapages << (PAGE_SHIFT-10),
469 initpages << (PAGE_SHIFT-10),
470 totalhigh_pages << (PAGE_SHIFT-10));
471 }
472
473 void free_initmem (void)
474 {
475 unsigned long addr;
476
477 addr = (unsigned long)(&__init_begin);
478 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
479 struct page *p;
480
481 p = virt_to_page(addr);
482
483 ClearPageReserved(p);
484 set_page_count(p, 1);
485 __free_page(p);
486 totalram_pages++;
487 num_physpages++;
488 }
489 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
490 }
491
492 #ifdef CONFIG_BLK_DEV_INITRD
493 void free_initrd_mem(unsigned long start, unsigned long end)
494 {
495 if (start < end)
496 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
497 for (; start < end; start += PAGE_SIZE) {
498 struct page *p = virt_to_page(start);
499
500 ClearPageReserved(p);
501 set_page_count(p, 1);
502 __free_page(p);
503 num_physpages++;
504 }
505 }
506 #endif
507
508 void sparc_flush_page_to_ram(struct page *page)
509 {
510 unsigned long vaddr = (unsigned long)page_address(page);
511
512 if (vaddr)
513 __flush_page_to_ram(vaddr);
514 }
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