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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / arch / sparc / mm / init.c
blobb89837accc88574e9554706ab1084e8fd642250a
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/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
26 #include <asm/system.h>
27 #include <asm/vac-ops.h>
28 #include <asm/page.h>
29 #include <asm/pgtable.h>
30 #include <asm/vaddrs.h>
31 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
32 #include <asm/tlb.h>
33 #include <asm/prom.h>
34
35 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
36
37 unsigned long *sparc_valid_addr_bitmap;
38
39 unsigned long phys_base;
40 unsigned long pfn_base;
41
42 unsigned long page_kernel;
43
44 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
45 unsigned long sparc_unmapped_base;
46
47 struct pgtable_cache_struct pgt_quicklists;
48
49 /* References to section boundaries */
50 extern char __init_begin, __init_end, _start, _end, etext , edata;
51
52 /* Initial ramdisk setup */
53 extern unsigned int sparc_ramdisk_image;
54 extern unsigned int sparc_ramdisk_size;
55
56 unsigned long highstart_pfn, highend_pfn;
57
58 pte_t *kmap_pte;
59 pgprot_t kmap_prot;
60
61 #define kmap_get_fixmap_pte(vaddr) \
62 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
63
64 void __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
71 void 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);
78 printk("%ld free pages\n", nr_free_pages());
79 #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
88 void __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
107 extern unsigned long cmdline_memory_size;
108 unsigned long last_valid_pfn;
109
110 unsigned 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
131 unsigned long calc_max_low_pfn(void)
132 {
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
153 unsigned 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) {
209 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
210 sparc_ramdisk_image -= KERNBASE;
211 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;
262 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
263 *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;
271 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
272 *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;
279 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
280 *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 */
295 int pgt_cache_water[2] = { 25, 50 };
296
297 void 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 */
307 extern void sun4c_paging_init(void);
308 extern void srmmu_paging_init(void);
309 extern void device_scan(void);
310
311 pgprot_t PAGE_SHARED __read_mostly;
312 EXPORT_SYMBOL(PAGE_SHARED);
313
314 void __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();
355 prom_build_devicetree();
356 device_scan();
357 }
358
359 struct cache_palias *sparc_aliases;
360
361 static void __init taint_real_pages(void)
362 {
363 int i;
364
365 for (i = 0; sp_banks[i].num_bytes; i++) {
366 unsigned long start, end;
367
368 start = sp_banks[i].base_addr;
369 end = start + sp_banks[i].num_bytes;
370
371 while (start < end) {
372 set_bit(start >> 20, sparc_valid_addr_bitmap);
373 start += PAGE_SIZE;
374 }
375 }
376 }
377
378 void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
379 {
380 unsigned long tmp;
381
382 #ifdef CONFIG_DEBUG_HIGHMEM
383 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
384 #endif
385
386 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
387 struct page *page = pfn_to_page(tmp);
388
389 ClearPageReserved(page);
390 init_page_count(page);
391 __free_page(page);
392 totalhigh_pages++;
393 }
394 }
395
396 void __init mem_init(void)
397 {
398 int codepages = 0;
399 int datapages = 0;
400 int initpages = 0;
401 int reservedpages = 0;
402 int i;
403
404 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
405 prom_printf("BUG: fixmap and pkmap areas overlap\n");
406 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
407 PKMAP_BASE,
408 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
409 FIXADDR_START);
410 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
411 prom_halt();
412 }
413
414
415 /* Saves us work later. */
416 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
417
418 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
419 i += 1;
420 sparc_valid_addr_bitmap = (unsigned long *)
421 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
422
423 if (sparc_valid_addr_bitmap == NULL) {
424 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
425 prom_halt();
426 }
427 memset(sparc_valid_addr_bitmap, 0, i << 2);
428
429 taint_real_pages();
430
431 max_mapnr = last_valid_pfn - pfn_base;
432 high_memory = __va(max_low_pfn << PAGE_SHIFT);
433
434 totalram_pages = free_all_bootmem();
435
436 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
437 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
438 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
439
440 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
441
442 if (end_pfn <= highstart_pfn)
443 continue;
444
445 if (start_pfn < highstart_pfn)
446 start_pfn = highstart_pfn;
447
448 map_high_region(start_pfn, end_pfn);
449 }
450
451 totalram_pages += totalhigh_pages;
452
453 codepages = (((unsigned long) &etext) - ((unsigned long)&_start));
454 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
455 datapages = (((unsigned long) &edata) - ((unsigned long)&etext));
456 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
457 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
458 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
459
460 /* Ignore memory holes for the purpose of counting reserved pages */
461 for (i=0; i < max_low_pfn; i++)
462 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
463 && PageReserved(pfn_to_page(i)))
464 reservedpages++;
465
466 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
467 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
468 num_physpages << (PAGE_SHIFT - 10),
469 codepages << (PAGE_SHIFT-10),
470 reservedpages << (PAGE_SHIFT - 10),
471 datapages << (PAGE_SHIFT-10),
472 initpages << (PAGE_SHIFT-10),
473 totalhigh_pages << (PAGE_SHIFT-10));
474 }
475
476 void free_initmem (void)
477 {
478 unsigned long addr;
479
480 addr = (unsigned long)(&__init_begin);
481 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
482 struct page *p;
483
484 p = virt_to_page(addr);
485
486 ClearPageReserved(p);
487 init_page_count(p);
488 __free_page(p);
489 totalram_pages++;
490 num_physpages++;
491 }
492 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
493 }
494
495 #ifdef CONFIG_BLK_DEV_INITRD
496 void free_initrd_mem(unsigned long start, unsigned long end)
497 {
498 if (start < end)
499 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
500 for (; start < end; start += PAGE_SIZE) {
501 struct page *p = virt_to_page(start);
502
503 ClearPageReserved(p);
504 init_page_count(p);
505 __free_page(p);
506 num_physpages++;
507 }
508 }
509 #endif
510
511 void sparc_flush_page_to_ram(struct page *page)
512 {
513 unsigned long vaddr = (unsigned long)page_address(page);
514
515 if (vaddr)
516 __flush_page_to_ram(vaddr);
517 }
WRT350N Kernel Patches