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 #include <linux/gfp.h>
28
29 #include <asm/sections.h>
30 #include <asm/system.h>
31 #include <asm/vac-ops.h>
32 #include <asm/page.h>
33 #include <asm/pgtable.h>
34 #include <asm/vaddrs.h>
35 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */
36 #include <asm/tlb.h>
37 #include <asm/prom.h>
38 #include <asm/leon.h>
39
40 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
41
42 unsigned long *sparc_valid_addr_bitmap;
43 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
44
45 unsigned long phys_base;
46 EXPORT_SYMBOL(phys_base);
47
48 unsigned long pfn_base;
49 EXPORT_SYMBOL(pfn_base);
50
51 unsigned long page_kernel;
52 EXPORT_SYMBOL(page_kernel);
53
54 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
55 unsigned long sparc_unmapped_base;
56
57 struct pgtable_cache_struct pgt_quicklists;
58
59 /* Initial ramdisk setup */
60 extern unsigned int sparc_ramdisk_image;
61 extern unsigned int sparc_ramdisk_size;
62
63 unsigned long highstart_pfn, highend_pfn;
64
65 pte_t *kmap_pte;
66 pgprot_t kmap_prot;
67
68 #define kmap_get_fixmap_pte(vaddr) \
69 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
70
kmap_init(void)71 void __init kmap_init(void)
72 {
73 /* cache the first kmap pte */
74 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
75 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
76 }
77
show_mem(unsigned int filter)78 void show_mem(unsigned int filter)
79 {
80 printk("Mem-info:\n");
81 show_free_areas();
82 printk("Free swap: %6ldkB\n",
83 nr_swap_pages << (PAGE_SHIFT-10));
84 printk("%ld pages of RAM\n", totalram_pages);
85 printk("%ld free pages\n", nr_free_pages());
86 #if 0 /* undefined pgtable_cache_size, pgd_cache_size */
87 printk("%ld pages in page table cache\n",pgtable_cache_size);
88 #ifndef CONFIG_SMP
89 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
90 printk("%ld entries in page dir cache\n",pgd_cache_size);
91 #endif
92 #endif
93 }
94
sparc_context_init(int numctx)95 void __init sparc_context_init(int numctx)
96 {
97 int ctx;
98
99 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
100
101 for(ctx = 0; ctx < numctx; ctx++) {
102 struct ctx_list *clist;
103
104 clist = (ctx_list_pool + ctx);
105 clist->ctx_number = ctx;
106 clist->ctx_mm = NULL;
107 }
108 ctx_free.next = ctx_free.prev = &ctx_free;
109 ctx_used.next = ctx_used.prev = &ctx_used;
110 for(ctx = 0; ctx < numctx; ctx++)
111 add_to_free_ctxlist(ctx_list_pool + ctx);
112 }
113
114 extern unsigned long cmdline_memory_size;
115 unsigned long last_valid_pfn;
116
calc_highpages(void)117 unsigned long calc_highpages(void)
118 {
119 int i;
120 int nr = 0;
121
122 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
123 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
124 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
125
126 if (end_pfn <= max_low_pfn)
127 continue;
128
129 if (start_pfn < max_low_pfn)
130 start_pfn = max_low_pfn;
131
132 nr += end_pfn - start_pfn;
133 }
134
135 return nr;
136 }
137
calc_max_low_pfn(void)138 static unsigned long calc_max_low_pfn(void)
139 {
140 int i;
141 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
142 unsigned long curr_pfn, last_pfn;
143
144 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
145 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
146 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
147
148 if (curr_pfn >= tmp) {
149 if (last_pfn < tmp)
150 tmp = last_pfn;
151 break;
152 }
153
154 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
155 }
156
157 return tmp;
158 }
159
bootmem_init(unsigned long * pages_avail)160 unsigned long __init bootmem_init(unsigned long *pages_avail)
161 {
162 unsigned long bootmap_size, start_pfn;
163 unsigned long end_of_phys_memory = 0UL;
164 unsigned long bootmap_pfn, bytes_avail, size;
165 int i;
166
167 bytes_avail = 0UL;
168 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
169 end_of_phys_memory = sp_banks[i].base_addr +
170 sp_banks[i].num_bytes;
171 bytes_avail += sp_banks[i].num_bytes;
172 if (cmdline_memory_size) {
173 if (bytes_avail > cmdline_memory_size) {
174 unsigned long slack = bytes_avail - cmdline_memory_size;
175
176 bytes_avail -= slack;
177 end_of_phys_memory -= slack;
178
179 sp_banks[i].num_bytes -= slack;
180 if (sp_banks[i].num_bytes == 0) {
181 sp_banks[i].base_addr = 0xdeadbeef;
182 } else {
183 sp_banks[i+1].num_bytes = 0;
184 sp_banks[i+1].base_addr = 0xdeadbeef;
185 }
186 break;
187 }
188 }
189 }
190
191 /* Start with page aligned address of last symbol in kernel
192 * image.
193 */
194 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
195
196 /* Now shift down to get the real physical page frame number. */
197 start_pfn >>= PAGE_SHIFT;
198
199 bootmap_pfn = start_pfn;
200
201 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
202
203 max_low_pfn = max_pfn;
204 highstart_pfn = highend_pfn = max_pfn;
205
206 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
207 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
208 max_low_pfn = calc_max_low_pfn();
209 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
210 calc_highpages() >> (20 - PAGE_SHIFT));
211 }
212
213 #ifdef CONFIG_BLK_DEV_INITRD
214 /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
215 if (sparc_ramdisk_image) {
216 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
217 sparc_ramdisk_image -= KERNBASE;
218 initrd_start = sparc_ramdisk_image + phys_base;
219 initrd_end = initrd_start + sparc_ramdisk_size;
220 if (initrd_end > end_of_phys_memory) {
221 printk(KERN_CRIT "initrd extends beyond end of memory "
222 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
223 initrd_end, end_of_phys_memory);
224 initrd_start = 0;
225 }
226 if (initrd_start) {
227 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
228 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
229 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
230 }
231 }
232 #endif
233 /* Initialize the boot-time allocator. */
234 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
235 max_low_pfn);
236
237 /* Now register the available physical memory with the
238 * allocator.
239 */
240 *pages_avail = 0;
241 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
242 unsigned long curr_pfn, last_pfn;
243
244 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
245 if (curr_pfn >= max_low_pfn)
246 break;
247
248 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
249 if (last_pfn > max_low_pfn)
250 last_pfn = max_low_pfn;
251
252 /*
253 * .. finally, did all the rounding and playing
254 * around just make the area go away?
255 */
256 if (last_pfn <= curr_pfn)
257 continue;
258
259 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
260 *pages_avail += last_pfn - curr_pfn;
261
262 free_bootmem(sp_banks[i].base_addr, size);
263 }
264
265 #ifdef CONFIG_BLK_DEV_INITRD
266 if (initrd_start) {
267 /* Reserve the initrd image area. */
268 size = initrd_end - initrd_start;
269 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
270 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
271
272 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
273 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
274 }
275 #endif
276 /* Reserve the kernel text/data/bss. */
277 size = (start_pfn << PAGE_SHIFT) - phys_base;
278 reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
279 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
280
281 /* Reserve the bootmem map. We do not account for it
282 * in pages_avail because we will release that memory
283 * in free_all_bootmem.
284 */
285 size = bootmap_size;
286 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
287 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
288
289 return max_pfn;
290 }
291
292 /*
293 * check_pgt_cache
294 *
295 * This is called at the end of unmapping of VMA (zap_page_range),
296 * to rescan the page cache for architecture specific things,
297 * presumably something like sun4/sun4c PMEGs. Most architectures
298 * define check_pgt_cache empty.
299 *
300 * We simply copy the 2.4 implementation for now.
301 */
302 static int pgt_cache_water[2] = { 25, 50 };
303
check_pgt_cache(void)304 void check_pgt_cache(void)
305 {
306 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
307 }
308
309 /*
310 * paging_init() sets up the page tables: We call the MMU specific
311 * init routine based upon the Sun model type on the Sparc.
312 *
313 */
314 extern void sun4c_paging_init(void);
315 extern void srmmu_paging_init(void);
316 extern void device_scan(void);
317
318 pgprot_t PAGE_SHARED __read_mostly;
319 EXPORT_SYMBOL(PAGE_SHARED);
320
paging_init(void)321 void __init paging_init(void)
322 {
323 switch(sparc_cpu_model) {
324 case sun4c:
325 case sun4e:
326 case sun4:
327 sun4c_paging_init();
328 sparc_unmapped_base = 0xe0000000;
329 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
330 break;
331 case sparc_leon:
332 leon_init();
333 /* fall through */
334 case sun4m:
335 case sun4d:
336 srmmu_paging_init();
337 sparc_unmapped_base = 0x50000000;
338 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
339 break;
340 default:
341 prom_printf("paging_init: Cannot init paging on this Sparc\n");
342 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
343 prom_printf("paging_init: Halting...\n");
344 prom_halt();
345 };
346
347 /* Initialize the protection map with non-constant, MMU dependent values. */
348 protection_map[0] = PAGE_NONE;
349 protection_map[1] = PAGE_READONLY;
350 protection_map[2] = PAGE_COPY;
351 protection_map[3] = PAGE_COPY;
352 protection_map[4] = PAGE_READONLY;
353 protection_map[5] = PAGE_READONLY;
354 protection_map[6] = PAGE_COPY;
355 protection_map[7] = PAGE_COPY;
356 protection_map[8] = PAGE_NONE;
357 protection_map[9] = PAGE_READONLY;
358 protection_map[10] = PAGE_SHARED;
359 protection_map[11] = PAGE_SHARED;
360 protection_map[12] = PAGE_READONLY;
361 protection_map[13] = PAGE_READONLY;
362 protection_map[14] = PAGE_SHARED;
363 protection_map[15] = PAGE_SHARED;
364 btfixup();
365 prom_build_devicetree();
366 of_fill_in_cpu_data();
367 device_scan();
368 }
369
taint_real_pages(void)370 static void __init taint_real_pages(void)
371 {
372 int i;
373
374 for (i = 0; sp_banks[i].num_bytes; i++) {
375 unsigned long start, end;
376
377 start = sp_banks[i].base_addr;
378 end = start + sp_banks[i].num_bytes;
379
380 while (start < end) {
381 set_bit(start >> 20, sparc_valid_addr_bitmap);
382 start += PAGE_SIZE;
383 }
384 }
385 }
386
map_high_region(unsigned long start_pfn,unsigned long end_pfn)387 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
388 {
389 unsigned long tmp;
390
391 #ifdef CONFIG_DEBUG_HIGHMEM
392 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
393 #endif
394
395 for (tmp = start_pfn; tmp < end_pfn; tmp++) {
396 struct page *page = pfn_to_page(tmp);
397
398 ClearPageReserved(page);
399 init_page_count(page);
400 __free_page(page);
401 totalhigh_pages++;
402 }
403 }
404
mem_init(void)405 void __init mem_init(void)
406 {
407 int codepages = 0;
408 int datapages = 0;
409 int initpages = 0;
410 int reservedpages = 0;
411 int i;
412
413 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
414 prom_printf("BUG: fixmap and pkmap areas overlap\n");
415 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
416 PKMAP_BASE,
417 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
418 FIXADDR_START);
419 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
420 prom_halt();
421 }
422
423
424 /* Saves us work later. */
425 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
426
427 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
428 i += 1;
429 sparc_valid_addr_bitmap = (unsigned long *)
430 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
431
432 if (sparc_valid_addr_bitmap == NULL) {
433 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
434 prom_halt();
435 }
436 memset(sparc_valid_addr_bitmap, 0, i << 2);
437
438 taint_real_pages();
439
440 max_mapnr = last_valid_pfn - pfn_base;
441 high_memory = __va(max_low_pfn << PAGE_SHIFT);
442
443 totalram_pages = free_all_bootmem();
444
445 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
446 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
447 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
448
449 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
450
451 if (end_pfn <= highstart_pfn)
452 continue;
453
454 if (start_pfn < highstart_pfn)
455 start_pfn = highstart_pfn;
456
457 map_high_region(start_pfn, end_pfn);
458 }
459
460 totalram_pages += totalhigh_pages;
461
462 codepages = (((unsigned long) &_etext) - ((unsigned long)&_start));
463 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
464 datapages = (((unsigned long) &_edata) - ((unsigned long)&_etext));
465 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
466 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
467 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
468
469 /* Ignore memory holes for the purpose of counting reserved pages */
470 for (i=0; i < max_low_pfn; i++)
471 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
472 && PageReserved(pfn_to_page(i)))
473 reservedpages++;
474
475 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
476 nr_free_pages() << (PAGE_SHIFT-10),
477 num_physpages << (PAGE_SHIFT - 10),
478 codepages << (PAGE_SHIFT-10),
479 reservedpages << (PAGE_SHIFT - 10),
480 datapages << (PAGE_SHIFT-10),
481 initpages << (PAGE_SHIFT-10),
482 totalhigh_pages << (PAGE_SHIFT-10));
483 }
484
free_initmem(void)485 void free_initmem (void)
486 {
487 unsigned long addr;
488 unsigned long freed;
489
490 addr = (unsigned long)(&__init_begin);
491 freed = (unsigned long)(&__init_end) - addr;
492 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
493 struct page *p;
494
495 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
496 p = virt_to_page(addr);
497
498 ClearPageReserved(p);
499 init_page_count(p);
500 __free_page(p);
501 totalram_pages++;
502 num_physpages++;
503 }
504 printk(KERN_INFO "Freeing unused kernel memory: %ldk freed\n",
505 freed >> 10);
506 }
507
508 #ifdef CONFIG_BLK_DEV_INITRD
free_initrd_mem(unsigned long start,unsigned long end)509 void free_initrd_mem(unsigned long start, unsigned long end)
510 {
511 if (start < end)
512 printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
513 (end - start) >> 10);
514 for (; start < end; start += PAGE_SIZE) {
515 struct page *p;
516
517 memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
518 p = virt_to_page(start);
519
520 ClearPageReserved(p);
521 init_page_count(p);
522 __free_page(p);
523 totalram_pages++;
524 num_physpages++;
525 }
526 }
527 #endif
528
sparc_flush_page_to_ram(struct page * page)529 void sparc_flush_page_to_ram(struct page *page)
530 {
531 unsigned long vaddr = (unsigned long)page_address(page);
532
533 if (vaddr)
534 __flush_page_to_ram(vaddr);
535 }
536 EXPORT_SYMBOL(sparc_flush_page_to_ram);
537