blob: 2de4d3c367a2c2da9adb6bcf29b5105c46c01f78 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1994 - 2000 Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
10 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/signal.h>
14#include <linux/sched.h>
15#include <linux/kernel.h>
16#include <linux/errno.h>
17#include <linux/string.h>
18#include <linux/types.h>
19#include <linux/pagemap.h>
20#include <linux/ptrace.h>
21#include <linux/mman.h>
22#include <linux/mm.h>
23#include <linux/bootmem.h>
24#include <linux/highmem.h>
25#include <linux/swap.h>
Daniel Jacobowitz3d503752005-01-20 19:59:54 -050026#include <linux/proc_fs.h>
Dave Hansen22a98352006-03-27 01:16:04 -080027#include <linux/pfn.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#include <asm/bootinfo.h>
30#include <asm/cachectl.h>
31#include <asm/cpu.h>
32#include <asm/dma.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010033#include <asm/kmap_types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/mmu_context.h>
35#include <asm/sections.h>
36#include <asm/pgtable.h>
37#include <asm/pgalloc.h>
38#include <asm/tlb.h>
Ralf Baechlef8829ca2006-10-21 23:17:35 +010039#include <asm/fixmap.h>
40
41/* Atomicity and interruptability */
42#ifdef CONFIG_MIPS_MT_SMTC
43
44#include <asm/mipsmtregs.h>
45
46#define ENTER_CRITICAL(flags) \
47 { \
48 unsigned int mvpflags; \
49 local_irq_save(flags);\
50 mvpflags = dvpe()
51#define EXIT_CRITICAL(flags) \
52 evpe(mvpflags); \
53 local_irq_restore(flags); \
54 }
55#else
56
57#define ENTER_CRITICAL(flags) local_irq_save(flags)
58#define EXIT_CRITICAL(flags) local_irq_restore(flags)
59
60#endif /* CONFIG_MIPS_MT_SMTC */
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
63
64unsigned long highstart_pfn, highend_pfn;
65
66/*
67 * We have up to 8 empty zeroed pages so we can map one of the right colour
68 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
69 * where we have to avoid VCED / VECI exceptions for good performance at
70 * any price. Since page is never written to after the initialization we
71 * don't have to care about aliases on other CPUs.
72 */
73unsigned long empty_zero_page, zero_page_mask;
74
75/*
76 * Not static inline because used by IP27 special magic initialization code
77 */
78unsigned long setup_zero_pages(void)
79{
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080080 unsigned int order;
81 unsigned long size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 struct page *page;
83
84 if (cpu_has_vce)
85 order = 3;
86 else
87 order = 0;
88
89 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
90 if (!empty_zero_page)
91 panic("Oh boy, that early out of memory?");
92
93 page = virt_to_page(empty_zero_page);
Nick Piggin8dfcc9b2006-03-22 00:08:05 -080094 split_page(page, order);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 while (page < virt_to_page(empty_zero_page + (PAGE_SIZE << order))) {
Hugh Dickins68352e62005-12-12 00:37:23 -080096 SetPageReserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 page++;
98 }
99
100 size = PAGE_SIZE << order;
101 zero_page_mask = (size - 1) & PAGE_MASK;
102
103 return 1UL << order;
104}
105
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100106/*
107 * These are almost like kmap_atomic / kunmap_atmic except they take an
108 * additional address argument as the hint.
109 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111#define kmap_get_fixmap_pte(vaddr) \
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000112 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100114#ifdef CONFIG_MIPS_MT_SMTC
115static pte_t *kmap_coherent_pte;
116static void __init kmap_coherent_init(void)
117{
118 unsigned long vaddr;
119
120 /* cache the first coherent kmap pte */
121 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
122 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
123}
124#else
125static inline void kmap_coherent_init(void) {}
126#endif
127
128static inline void *kmap_coherent(struct page *page, unsigned long addr)
129{
130 enum fixed_addresses idx;
131 unsigned long vaddr, flags, entrylo;
132 unsigned long old_ctx;
133 pte_t pte;
134 int tlbidx;
135
136 inc_preempt_count();
137 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
138#ifdef CONFIG_MIPS_MT_SMTC
139 idx += FIX_N_COLOURS * smp_processor_id();
140#endif
141 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
142 pte = mk_pte(page, PAGE_KERNEL);
143#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
144 entrylo = pte.pte_high;
145#else
146 entrylo = pte_val(pte) >> 6;
147#endif
148
149 ENTER_CRITICAL(flags);
150 old_ctx = read_c0_entryhi();
151 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
152 write_c0_entrylo0(entrylo);
153 write_c0_entrylo1(entrylo);
154#ifdef CONFIG_MIPS_MT_SMTC
155 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
156 /* preload TLB instead of local_flush_tlb_one() */
157 mtc0_tlbw_hazard();
158 tlb_probe();
159 tlb_probe_hazard();
160 tlbidx = read_c0_index();
161 mtc0_tlbw_hazard();
162 if (tlbidx < 0)
163 tlb_write_random();
164 else
165 tlb_write_indexed();
166#else
167 tlbidx = read_c0_wired();
168 write_c0_wired(tlbidx + 1);
169 write_c0_index(tlbidx);
170 mtc0_tlbw_hazard();
171 tlb_write_indexed();
172#endif
173 tlbw_use_hazard();
174 write_c0_entryhi(old_ctx);
175 EXIT_CRITICAL(flags);
176
177 return (void*) vaddr;
178}
179
180#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
181
182static inline void kunmap_coherent(struct page *page)
183{
184#ifndef CONFIG_MIPS_MT_SMTC
185 unsigned int wired;
186 unsigned long flags, old_ctx;
187
188 ENTER_CRITICAL(flags);
189 old_ctx = read_c0_entryhi();
190 wired = read_c0_wired() - 1;
191 write_c0_wired(wired);
192 write_c0_index(wired);
193 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
194 write_c0_entrylo0(0);
195 write_c0_entrylo1(0);
196 mtc0_tlbw_hazard();
197 tlb_write_indexed();
198 tlbw_use_hazard();
199 write_c0_entryhi(old_ctx);
200 EXIT_CRITICAL(flags);
201#endif
202 dec_preempt_count();
203 preempt_check_resched();
204}
205
206void copy_to_user_page(struct vm_area_struct *vma,
207 struct page *page, unsigned long vaddr, void *dst, const void *src,
208 unsigned long len)
209{
210 if (cpu_has_dc_aliases) {
211 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
212 memcpy(vto, src, len);
213 kunmap_coherent(page);
214 } else
215 memcpy(dst, src, len);
216 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
217 flush_cache_page(vma, vaddr, page_to_pfn(page));
218}
219
220EXPORT_SYMBOL(copy_to_user_page);
221
222void copy_from_user_page(struct vm_area_struct *vma,
223 struct page *page, unsigned long vaddr, void *dst, const void *src,
224 unsigned long len)
225{
226 if (cpu_has_dc_aliases) {
227 void *vfrom =
228 kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
229 memcpy(dst, vfrom, len);
230 kunmap_coherent(page);
231 } else
232 memcpy(dst, src, len);
233}
234
235EXPORT_SYMBOL(copy_from_user_page);
236
237
238#ifdef CONFIG_HIGHMEM
239pte_t *kmap_pte;
240pgprot_t kmap_prot;
241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242static void __init kmap_init(void)
243{
244 unsigned long kmap_vstart;
245
246 /* cache the first kmap pte */
247 kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
248 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
249
250 kmap_prot = PAGE_KERNEL;
251}
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100252#endif /* CONFIG_HIGHMEM */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Ralf Baechle84fd0892005-02-07 16:13:07 +0000254void __init fixrange_init(unsigned long start, unsigned long end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 pgd_t *pgd_base)
256{
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100257#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 pgd_t *pgd;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000259 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 pmd_t *pmd;
261 pte_t *pte;
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000262 int i, j, k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 unsigned long vaddr;
264
265 vaddr = start;
266 i = __pgd_offset(vaddr);
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000267 j = __pud_offset(vaddr);
268 k = __pmd_offset(vaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 pgd = pgd_base + i;
270
271 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000272 pud = (pud_t *)pgd;
273 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
274 pmd = (pmd_t *)pud;
275 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
276 if (pmd_none(*pmd)) {
277 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100278 set_pmd(pmd, __pmd((unsigned long)pte));
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000279 if (pte != pte_offset_kernel(pmd, 0))
280 BUG();
281 }
282 vaddr += PMD_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
Ralf Baechlec6e8b582005-02-10 12:19:59 +0000284 k = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 }
286 j = 0;
287 }
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100288#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700291#ifndef CONFIG_NEED_MULTIPLE_NODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292extern void pagetable_init(void);
293
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900294static int __init page_is_ram(unsigned long pagenr)
295{
296 int i;
297
298 for (i = 0; i < boot_mem_map.nr_map; i++) {
299 unsigned long addr, end;
300
301 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
302 /* not usable memory */
303 continue;
304
305 addr = PFN_UP(boot_mem_map.map[i].addr);
306 end = PFN_DOWN(boot_mem_map.map[i].addr +
307 boot_mem_map.map[i].size);
308
309 if (pagenr >= addr && pagenr < end)
310 return 1;
311 }
312
313 return 0;
314}
315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316void __init paging_init(void)
317{
Atsushi Nemotob58e5d02006-09-30 03:34:06 +0900318 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 unsigned long max_dma, high, low;
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900320#ifndef CONFIG_FLATMEM
Atsushi Nemotob58e5d02006-09-30 03:34:06 +0900321 unsigned long zholes_size[MAX_NR_ZONES] = { 0, };
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900322 unsigned long i, j, pfn;
323#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
325 pagetable_init();
326
327#ifdef CONFIG_HIGHMEM
328 kmap_init();
329#endif
Ralf Baechlef8829ca2006-10-21 23:17:35 +0100330 kmap_coherent_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
333 low = max_low_pfn;
334 high = highend_pfn;
335
336#ifdef CONFIG_ISA
337 if (low < max_dma)
338 zones_size[ZONE_DMA] = low;
339 else {
340 zones_size[ZONE_DMA] = max_dma;
341 zones_size[ZONE_NORMAL] = low - max_dma;
342 }
343#else
344 zones_size[ZONE_DMA] = low;
345#endif
346#ifdef CONFIG_HIGHMEM
347 if (cpu_has_dc_aliases) {
348 printk(KERN_WARNING "This processor doesn't support highmem.");
349 if (high - low)
350 printk(" %ldk highmem ignored", high - low);
351 printk("\n");
352 } else
353 zones_size[ZONE_HIGHMEM] = high - low;
354#endif
355
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900356#ifdef CONFIG_FLATMEM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 free_area_init(zones_size);
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900358#else
359 pfn = 0;
360 for (i = 0; i < MAX_NR_ZONES; i++)
361 for (j = 0; j < zones_size[i]; j++, pfn++)
362 if (!page_is_ram(pfn))
363 zholes_size[i]++;
364 free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
365#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366}
367
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500368static struct kcore_list kcore_mem, kcore_vmalloc;
369#ifdef CONFIG_64BIT
370static struct kcore_list kcore_kseg0;
371#endif
372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373void __init mem_init(void)
374{
375 unsigned long codesize, reservedpages, datasize, initsize;
376 unsigned long tmp, ram;
377
378#ifdef CONFIG_HIGHMEM
379#ifdef CONFIG_DISCONTIGMEM
380#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
381#endif
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900382 max_mapnr = highend_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383#else
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900384 max_mapnr = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385#endif
386 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
387
388 totalram_pages += free_all_bootmem();
389 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
390
391 reservedpages = ram = 0;
392 for (tmp = 0; tmp < max_low_pfn; tmp++)
393 if (page_is_ram(tmp)) {
394 ram++;
Chad Reeseb1c231f2006-05-30 17:16:49 -0700395 if (PageReserved(pfn_to_page(tmp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 reservedpages++;
397 }
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900398 num_physpages = ram;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400#ifdef CONFIG_HIGHMEM
401 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
402 struct page *page = mem_map + tmp;
403
404 if (!page_is_ram(tmp)) {
405 SetPageReserved(page);
406 continue;
407 }
408 ClearPageReserved(page);
409#ifdef CONFIG_LIMITED_DMA
410 set_page_address(page, lowmem_page_address(page));
411#endif
Nick Piggin7835e982006-03-22 00:08:40 -0800412 init_page_count(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 __free_page(page);
414 totalhigh_pages++;
415 }
416 totalram_pages += totalhigh_pages;
Atsushi Nemoto565200a2006-07-07 00:26:02 +0900417 num_physpages += totalhigh_pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418#endif
419
420 codesize = (unsigned long) &_etext - (unsigned long) &_text;
421 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
422 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
423
Daniel Jacobowitz3d503752005-01-20 19:59:54 -0500424#ifdef CONFIG_64BIT
425 if ((unsigned long) &_text > (unsigned long) CKSEG0)
426 /* The -4 is a hack so that user tools don't have to handle
427 the overflow. */
428 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
429#endif
430 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
431 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
432 VMALLOC_END-VMALLOC_START);
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
435 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
436 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
437 ram << (PAGE_SHIFT-10),
438 codesize >> 10,
439 reservedpages << (PAGE_SHIFT-10),
440 datasize >> 10,
441 initsize >> 10,
442 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
443}
Yoichi Yuasab4819b52005-06-25 14:54:31 -0700444#endif /* !CONFIG_NEED_MULTIPLE_NODES */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000446void free_init_pages(char *what, unsigned long begin, unsigned long end)
447{
448 unsigned long addr;
449
450 for (addr = begin; addr < end; addr += PAGE_SIZE) {
451 ClearPageReserved(virt_to_page(addr));
452 init_page_count(virt_to_page(addr));
453 memset((void *)addr, 0xcc, PAGE_SIZE);
454 free_page(addr);
455 totalram_pages++;
456 }
457 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
458}
459
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460#ifdef CONFIG_BLK_DEV_INITRD
461void free_initrd_mem(unsigned long start, unsigned long end)
462{
Ralf Baechle875d43e2005-09-03 15:56:16 -0700463#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 /* Switch from KSEG0 to XKPHYS addresses */
465 start = (unsigned long)phys_to_virt(CPHYSADDR(start));
466 end = (unsigned long)phys_to_virt(CPHYSADDR(end));
467#endif
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000468 free_init_pages("initrd memory", start, end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470#endif
471
472extern unsigned long prom_free_prom_memory(void);
473
474void free_initmem(void)
475{
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000476 unsigned long start, end, freed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 freed = prom_free_prom_memory();
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000479 if (freed)
480 printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000482 start = (unsigned long)(&__init_begin);
483 end = (unsigned long)(&__init_end);
Ralf Baechle875d43e2005-09-03 15:56:16 -0700484#ifdef CONFIG_64BIT
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000485 start = PAGE_OFFSET | CPHYSADDR(start);
486 end = PAGE_OFFSET | CPHYSADDR(end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487#endif
Ralf Baechle6fd11a22006-03-24 13:21:50 +0000488 free_init_pages("unused kernel memory", start, end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489}