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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>
34#include <asm/tlb.h>
35
36DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
37
38unsigned long *sparc_valid_addr_bitmap;
39
40unsigned long phys_base;
41unsigned long pfn_base;
42
43unsigned long page_kernel;
44
45struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
46unsigned long sparc_unmapped_base;
47
48struct pgtable_cache_struct pgt_quicklists;
49
50
51extern char __init_begin, __init_end, _start, _end, etext , edata;
52
53
54extern unsigned int sparc_ramdisk_image;
55extern unsigned int sparc_ramdisk_size;
56
57unsigned long highstart_pfn, highend_pfn;
58
59pte_t *kmap_pte;
60pgprot_t kmap_prot;
61
62EXPORT_SYMBOL(kmap_prot);
63EXPORT_SYMBOL(kmap_pte);
64
65#define kmap_get_fixmap_pte(vaddr) \
66 pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr))
67
68void __init kmap_init(void)
69{
70
71 kmap_pte = kmap_get_fixmap_pte(__fix_to_virt(FIX_KMAP_BEGIN));
72 kmap_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE);
73}
74
75void show_mem(void)
76{
77 printk("Mem-info:\n");
78 show_free_areas();
79 printk("Free swap: %6ldkB\n",
80 nr_swap_pages << (PAGE_SHIFT-10));
81 printk("%ld pages of RAM\n", totalram_pages);
82 printk("%d free pages\n", nr_free_pages());
83#if 0
84 printk("%ld pages in page table cache\n",pgtable_cache_size);
85#ifndef CONFIG_SMP
86 if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d)
87 printk("%ld entries in page dir cache\n",pgd_cache_size);
88#endif
89#endif
90}
91
92void __init sparc_context_init(int numctx)
93{
94 int ctx;
95
96 ctx_list_pool = __alloc_bootmem(numctx * sizeof(struct ctx_list), SMP_CACHE_BYTES, 0UL);
97
98 for(ctx = 0; ctx < numctx; ctx++) {
99 struct ctx_list *clist;
100
101 clist = (ctx_list_pool + ctx);
102 clist->ctx_number = ctx;
103 clist->ctx_mm = NULL;
104 }
105 ctx_free.next = ctx_free.prev = &ctx_free;
106 ctx_used.next = ctx_used.prev = &ctx_used;
107 for(ctx = 0; ctx < numctx; ctx++)
108 add_to_free_ctxlist(ctx_list_pool + ctx);
109}
110
111extern unsigned long cmdline_memory_size;
112unsigned long last_valid_pfn;
113
114unsigned long calc_highpages(void)
115{
116 int i;
117 int nr = 0;
118
119 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
120 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
121 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
122
123 if (end_pfn <= max_low_pfn)
124 continue;
125
126 if (start_pfn < max_low_pfn)
127 start_pfn = max_low_pfn;
128
129 nr += end_pfn - start_pfn;
130 }
131
132 return nr;
133}
134
135unsigned long calc_max_low_pfn(void)
136{
137 int i;
138 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
139 unsigned long curr_pfn, last_pfn;
140
141 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
142 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
143 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
144
145 if (curr_pfn >= tmp) {
146 if (last_pfn < tmp)
147 tmp = last_pfn;
148 break;
149 }
150
151 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
152 }
153
154 return tmp;
155}
156
157unsigned long __init bootmem_init(unsigned long *pages_avail)
158{
159 unsigned long bootmap_size, start_pfn;
160 unsigned long end_of_phys_memory = 0UL;
161 unsigned long bootmap_pfn, bytes_avail, size;
162 int i;
163
164 bytes_avail = 0UL;
165 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
166 end_of_phys_memory = sp_banks[i].base_addr +
167 sp_banks[i].num_bytes;
168 bytes_avail += sp_banks[i].num_bytes;
169 if (cmdline_memory_size) {
170 if (bytes_avail > cmdline_memory_size) {
171 unsigned long slack = bytes_avail - cmdline_memory_size;
172
173 bytes_avail -= slack;
174 end_of_phys_memory -= slack;
175
176 sp_banks[i].num_bytes -= slack;
177 if (sp_banks[i].num_bytes == 0) {
178 sp_banks[i].base_addr = 0xdeadbeef;
179 } else {
180 sp_banks[i+1].num_bytes = 0;
181 sp_banks[i+1].base_addr = 0xdeadbeef;
182 }
183 break;
184 }
185 }
186 }
187
188
189
190
191 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
192
193
194 start_pfn >>= PAGE_SHIFT;
195
196 bootmap_pfn = start_pfn;
197
198 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
199
200 max_low_pfn = max_pfn;
201 highstart_pfn = highend_pfn = max_pfn;
202
203 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
204 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
205 max_low_pfn = calc_max_low_pfn();
206 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
207 calc_highpages() >> (20 - PAGE_SHIFT));
208 }
209
210#ifdef CONFIG_BLK_DEV_INITRD
211
212 if (sparc_ramdisk_image) {
213 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
214 sparc_ramdisk_image -= KERNBASE;
215 initrd_start = sparc_ramdisk_image + phys_base;
216 initrd_end = initrd_start + sparc_ramdisk_size;
217 if (initrd_end > end_of_phys_memory) {
218 printk(KERN_CRIT "initrd extends beyond end of memory "
219 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
220 initrd_end, end_of_phys_memory);
221 initrd_start = 0;
222 }
223 if (initrd_start) {
224 if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
225 initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
226 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
227 }
228 }
229#endif
230
231 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
232 max_low_pfn);
233
234
235
236
237 *pages_avail = 0;
238 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
239 unsigned long curr_pfn, last_pfn;
240
241 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
242 if (curr_pfn >= max_low_pfn)
243 break;
244
245 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
246 if (last_pfn > max_low_pfn)
247 last_pfn = max_low_pfn;
248
249
250
251
252
253 if (last_pfn <= curr_pfn)
254 continue;
255
256 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
257 *pages_avail += last_pfn - curr_pfn;
258
259 free_bootmem(sp_banks[i].base_addr, size);
260 }
261
262#ifdef CONFIG_BLK_DEV_INITRD
263 if (initrd_start) {
264
265 size = initrd_end - initrd_start;
266 reserve_bootmem(initrd_start, size);
267 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
268
269 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
270 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
271 }
272#endif
273
274 size = (start_pfn << PAGE_SHIFT) - phys_base;
275 reserve_bootmem(phys_base, size);
276 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
277
278
279
280
281
282 size = bootmap_size;
283 reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size);
284 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
285
286 return max_pfn;
287}
288
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297
298
299int pgt_cache_water[2] = { 25, 50 };
300
301void check_pgt_cache(void)
302{
303 do_check_pgt_cache(pgt_cache_water[0], pgt_cache_water[1]);
304}
305
306
307
308
309
310
311extern void sun4c_paging_init(void);
312extern void srmmu_paging_init(void);
313extern void device_scan(void);
314
315void __init paging_init(void)
316{
317 switch(sparc_cpu_model) {
318 case sun4c:
319 case sun4e:
320 case sun4:
321 sun4c_paging_init();
322 sparc_unmapped_base = 0xe0000000;
323 BTFIXUPSET_SETHI(sparc_unmapped_base, 0xe0000000);
324 break;
325 case sun4m:
326 case sun4d:
327 srmmu_paging_init();
328 sparc_unmapped_base = 0x50000000;
329 BTFIXUPSET_SETHI(sparc_unmapped_base, 0x50000000);
330 break;
331 default:
332 prom_printf("paging_init: Cannot init paging on this Sparc\n");
333 prom_printf("paging_init: sparc_cpu_model = %d\n", sparc_cpu_model);
334 prom_printf("paging_init: Halting...\n");
335 prom_halt();
336 };
337
338
339 protection_map[0] = PAGE_NONE;
340 protection_map[1] = PAGE_READONLY;
341 protection_map[2] = PAGE_COPY;
342 protection_map[3] = PAGE_COPY;
343 protection_map[4] = PAGE_READONLY;
344 protection_map[5] = PAGE_READONLY;
345 protection_map[6] = PAGE_COPY;
346 protection_map[7] = PAGE_COPY;
347 protection_map[8] = PAGE_NONE;
348 protection_map[9] = PAGE_READONLY;
349 protection_map[10] = PAGE_SHARED;
350 protection_map[11] = PAGE_SHARED;
351 protection_map[12] = PAGE_READONLY;
352 protection_map[13] = PAGE_READONLY;
353 protection_map[14] = PAGE_SHARED;
354 protection_map[15] = PAGE_SHARED;
355 btfixup();
356 device_scan();
357}
358
359struct cache_palias *sparc_aliases;
360
361static 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
378void 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 set_bit(PG_highmem, &page->flags);
391 set_page_count(page, 1);
392 __free_page(page);
393 totalhigh_pages++;
394 }
395}
396
397void __init mem_init(void)
398{
399 int codepages = 0;
400 int datapages = 0;
401 int initpages = 0;
402 int reservedpages = 0;
403 int i;
404
405 highmem_start_page = pfn_to_page(highstart_pfn);
406
407 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
408 prom_printf("BUG: fixmap and pkmap areas overlap\n");
409 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
410 PKMAP_BASE,
411 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
412 FIXADDR_START);
413 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
414 prom_halt();
415 }
416
417
418
419 memset((void *)&empty_zero_page, 0, PAGE_SIZE);
420
421 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
422 i += 1;
423 sparc_valid_addr_bitmap = (unsigned long *)
424 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
425
426 if (sparc_valid_addr_bitmap == NULL) {
427 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
428 prom_halt();
429 }
430 memset(sparc_valid_addr_bitmap, 0, i << 2);
431
432 taint_real_pages();
433
434 max_mapnr = last_valid_pfn - pfn_base;
435 high_memory = __va(max_low_pfn << PAGE_SHIFT);
436
437 totalram_pages = free_all_bootmem();
438
439 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
440 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
441 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
442
443 num_physpages += sp_banks[i].num_bytes >> PAGE_SHIFT;
444
445 if (end_pfn <= highstart_pfn)
446 continue;
447
448 if (start_pfn < highstart_pfn)
449 start_pfn = highstart_pfn;
450
451 map_high_region(start_pfn, end_pfn);
452 }
453
454 totalram_pages += totalhigh_pages;
455
456 codepages = (((unsigned long) &etext) - ((unsigned long)&_start));
457 codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
458 datapages = (((unsigned long) &edata) - ((unsigned long)&etext));
459 datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
460 initpages = (((unsigned long) &__init_end) - ((unsigned long) &__init_begin));
461 initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;
462
463
464 for (i=0; i < max_low_pfn; i++)
465 if (test_bit(i >> (20 - PAGE_SHIFT), sparc_valid_addr_bitmap)
466 && PageReserved(pfn_to_page(i)))
467 reservedpages++;
468
469 printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init, %ldk highmem)\n",
470 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
471 num_physpages << (PAGE_SHIFT - 10),
472 codepages << (PAGE_SHIFT-10),
473 reservedpages << (PAGE_SHIFT - 10),
474 datapages << (PAGE_SHIFT-10),
475 initpages << (PAGE_SHIFT-10),
476 totalhigh_pages << (PAGE_SHIFT-10));
477}
478
479void free_initmem (void)
480{
481 unsigned long addr;
482
483 addr = (unsigned long)(&__init_begin);
484 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
485 struct page *p;
486
487 p = virt_to_page(addr);
488
489 ClearPageReserved(p);
490 set_page_count(p, 1);
491 __free_page(p);
492 totalram_pages++;
493 num_physpages++;
494 }
495 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
496}
497
498#ifdef CONFIG_BLK_DEV_INITRD
499void free_initrd_mem(unsigned long start, unsigned long end)
500{
501 if (start < end)
502 printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
503 for (; start < end; start += PAGE_SIZE) {
504 struct page *p = virt_to_page(start);
505
506 ClearPageReserved(p);
507 set_page_count(p, 1);
508 __free_page(p);
509 num_physpages++;
510 }
511}
512#endif
513
514void sparc_flush_page_to_ram(struct page *page)
515{
516 unsigned long vaddr = (unsigned long)page_address(page);
517
518 if (vaddr)
519 __flush_page_to_ram(vaddr);
520}
521
