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K2.6 patches and update.
[tomato.git] / release / src-rt / linux / linux-2.6 / arch / mips / mm / init.c
blob528a6ee0f202ec21b357605d4e466aec1c4869bc
1 /*
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 */
11 #include <linux/bug.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/signal.h>
15 #include <linux/sched.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/string.h>
19 #include <linux/types.h>
20 #include <linux/pagemap.h>
21 #include <linux/ptrace.h>
22 #include <linux/mman.h>
23 #include <linux/mm.h>
24 #include <linux/bootmem.h>
25 #include <linux/highmem.h>
26 #include <linux/swap.h>
27 #include <linux/proc_fs.h>
28 #include <linux/pfn.h>
29 #include <linux/hardirq.h>
30
31 #include <asm/bootinfo.h>
32 #include <asm/cachectl.h>
33 #include <asm/cpu.h>
34 #include <asm/dma.h>
35 #include <asm/kmap_types.h>
36 #include <asm/mmu_context.h>
37 #include <asm/sections.h>
38 #include <asm/pgtable.h>
39 #include <asm/pgalloc.h>
40 #include <asm/tlb.h>
41 #include <asm/fixmap.h>
42
43 /* Atomicity and interruptability */
44 #ifdef CONFIG_MIPS_MT_SMTC
45
46 #include <asm/mipsmtregs.h>
47
48 #define ENTER_CRITICAL(flags) \
49 { \
50 unsigned int mvpflags; \
51 local_irq_save(flags);\
52 mvpflags = dvpe()
53 #define EXIT_CRITICAL(flags) \
54 evpe(mvpflags); \
55 local_irq_restore(flags); \
56 }
57 #else
58
59 #define ENTER_CRITICAL(flags) local_irq_save(flags)
60 #define EXIT_CRITICAL(flags) local_irq_restore(flags)
61
62 #endif /* CONFIG_MIPS_MT_SMTC */
63
64 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
65 extern void cpu_early_probe_cache();
66
67 /*
68 * We have up to 8 empty zeroed pages so we can map one of the right colour
69 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
70 * where we have to avoid VCED / VECI exceptions for good performance at
71 * any price. Since page is never written to after the initialization we
72 * don't have to care about aliases on other CPUs.
73 */
74 unsigned long empty_zero_page, zero_page_mask;
75
76 /*
77 * Not static inline because used by IP27 special magic initialization code
78 */
79 unsigned long setup_zero_pages(void)
80 {
81 unsigned int order;
82 unsigned long size;
83 struct page *page;
84
85 if (cpu_has_vce)
86 order = 3;
87 else
88 order = 0;
89
90 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
91 if (!empty_zero_page)
92 panic("Oh boy, that early out of memory?");
93
94 page = virt_to_page((void *)empty_zero_page);
95 split_page(page, order);
96 while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
97 SetPageReserved(page);
98 page++;
99 }
100
101 size = PAGE_SIZE << order;
102 zero_page_mask = (size - 1) & PAGE_MASK;
103
104 return 1UL << order;
105 }
106
107 /*
108 * These are almost like kmap_atomic / kunmap_atmic except they take an
109 * additional address argument as the hint.
110 */
111
112 #define kmap_get_fixmap_pte(vaddr) \
113 pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
114
115 #ifdef CONFIG_MIPS_MT_SMTC
116 static pte_t *kmap_coherent_pte;
117 static void __init kmap_coherent_init(void)
118 {
119 unsigned long vaddr;
120
121 /* cache the first coherent kmap pte */
122 vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
123 kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
124 }
125 #else
126 static inline void kmap_coherent_init(void) {}
127 #endif
128
129 void *kmap_coherent(struct page *page, unsigned long addr)
130 {
131 enum fixed_addresses idx;
132 unsigned long vaddr, flags, entrylo;
133 unsigned long old_ctx;
134 pte_t pte;
135 int tlbidx;
136
137 BUG_ON(Page_dcache_dirty(page));
138
139 inc_preempt_count();
140 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
141 #ifdef CONFIG_MIPS_MT_SMTC
142 idx += FIX_N_COLOURS * smp_processor_id() +
143 (in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
144 #else
145 idx += in_interrupt() ? FIX_N_COLOURS : 0;
146 #endif
147 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
148 pte = mk_pte(page, PAGE_KERNEL);
149 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
150 entrylo = pte.pte_high;
151 #else
152 entrylo = pte_val(pte) >> 6;
153 #endif
154
155 ENTER_CRITICAL(flags);
156 old_ctx = read_c0_entryhi();
157 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
158 write_c0_entrylo0(entrylo);
159 write_c0_entrylo1(entrylo);
160 #ifdef CONFIG_MIPS_MT_SMTC
161 set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
162 /* preload TLB instead of local_flush_tlb_one() */
163 mtc0_tlbw_hazard();
164 tlb_probe();
165 tlb_probe_hazard();
166 tlbidx = read_c0_index();
167 mtc0_tlbw_hazard();
168 if (tlbidx < 0)
169 tlb_write_random();
170 else
171 tlb_write_indexed();
172 #else
173 tlbidx = read_c0_wired();
174 write_c0_wired(tlbidx + 1);
175 write_c0_index(tlbidx);
176 mtc0_tlbw_hazard();
177 tlb_write_indexed();
178 #endif
179 tlbw_use_hazard();
180 write_c0_entryhi(old_ctx);
181 EXIT_CRITICAL(flags);
182
183 return (void*) vaddr;
184 }
185
186 #define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
187
188 void kunmap_coherent(void)
189 {
190 #ifndef CONFIG_MIPS_MT_SMTC
191 unsigned int wired;
192 unsigned long flags, old_ctx;
193
194 ENTER_CRITICAL(flags);
195 old_ctx = read_c0_entryhi();
196 wired = read_c0_wired() - 1;
197 write_c0_wired(wired);
198 write_c0_index(wired);
199 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
200 write_c0_entrylo0(0);
201 write_c0_entrylo1(0);
202 mtc0_tlbw_hazard();
203 tlb_write_indexed();
204 tlbw_use_hazard();
205 write_c0_entryhi(old_ctx);
206 EXIT_CRITICAL(flags);
207 #endif
208 dec_preempt_count();
209 preempt_check_resched();
210 }
211
212 #ifdef REMOVE
213 void copy_user_highpage(struct page *to, struct page *from,
214 unsigned long vaddr, struct vm_area_struct *vma)
215 {
216 char *vfrom, *vto;
217
218 vto = kmap_atomic(to, KM_USER1);
219 if(cpu_has_dc_aliases) {
220 vfrom = kmap_coherent(from, vaddr);
221 copy_page(vto, vfrom);
222 kunmap_coherent();
223 } else {
224 vfrom = kmap_atomic(from, KM_USER0);
225 copy_page(vto, vfrom);
226 kunmap_atomic(vfrom, KM_USER0);
227 }
228 if (((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) ||
229 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
230 flush_data_cache_page((unsigned long)vto);
231 kunmap_atomic(vto, KM_USER1);
232 /* Make sure this page is cleared on other CPU's too before using it */
233 smp_wmb();
234 }
235
236 EXPORT_SYMBOL(copy_user_highpage);
237 #endif
238
239 void copy_to_user_page(struct vm_area_struct *vma,
240 struct page *page, unsigned long vaddr, void *dst, const void *src,
241 unsigned long len)
242 {
243 if (cpu_has_dc_aliases &&
244 page_mapped(page) && !Page_dcache_dirty(page)) {
245 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
246 memcpy(vto, src, len);
247 flush_data_cache_page((unsigned long)vto & PAGE_MASK);
248 kunmap_coherent();
249 } else {
250 memcpy(dst, src, len);
251 if (cpu_has_dc_aliases)
252 SetPageDcacheDirty(page);
253 }
254 if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
255 flush_cache_page(vma, vaddr, page_to_pfn(page));
256 }
257
258 EXPORT_SYMBOL(copy_to_user_page);
259
260 void copy_from_user_page(struct vm_area_struct *vma,
261 struct page *page, unsigned long vaddr, void *dst, const void *src,
262 unsigned long len)
263 {
264 if (cpu_has_dc_aliases &&
265 page_mapped(page) && !Page_dcache_dirty(page)) {
266 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
267 memcpy(dst, vfrom, len);
268 kunmap_coherent();
269 } else {
270 memcpy(dst, src, len);
271 if (cpu_has_dc_aliases)
272 SetPageDcacheDirty(page);
273 }
274 }
275
276 EXPORT_SYMBOL(copy_from_user_page);
277
278
279 #ifdef CONFIG_HIGHMEM
280 unsigned long highstart_pfn, highend_pfn;
281
282 pte_t *kmap_pte;
283 pgprot_t kmap_prot;
284
285 static void __init kmap_init(void)
286 {
287 unsigned long kmap_vstart;
288
289 /* cache the first kmap pte */
290 kmap_vstart = __fix_to_virt(VALIAS_IDX(FIX_KMAP_BEGIN));
291 kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
292
293 kmap_prot = PAGE_KERNEL;
294 }
295 #endif /* CONFIG_HIGHMEM */
296
297 void __init fixrange_init(unsigned long start, unsigned long end,
298 pgd_t *pgd_base)
299 {
300 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
301 pgd_t *pgd;
302 pud_t *pud;
303 pmd_t *pmd;
304 pte_t *pte;
305 int i, j, k;
306 unsigned long vaddr;
307
308 vaddr = start;
309 i = __pgd_offset(vaddr);
310 j = __pud_offset(vaddr);
311 k = __pmd_offset(vaddr);
312 pgd = pgd_base + i;
313
314 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
315 pud = (pud_t *)pgd;
316 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
317 pmd = (pmd_t *)pud;
318 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
319 if (pmd_none(*pmd)) {
320 pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
321 set_pmd(pmd, __pmd((unsigned long)pte));
322 if (pte != pte_offset_kernel(pmd, 0))
323 BUG();
324 }
325 vaddr += PMD_SIZE;
326 }
327 k = 0;
328 }
329 j = 0;
330 }
331 #endif
332 }
333
334 #ifndef CONFIG_NEED_MULTIPLE_NODES
335 static int __init page_is_ram(unsigned long pagenr)
336 {
337 int i;
338
339 for (i = 0; i < boot_mem_map.nr_map; i++) {
340 unsigned long addr, end;
341
342 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
343 /* not usable memory */
344 continue;
345
346 addr = PFN_UP(boot_mem_map.map[i].addr);
347 end = PFN_DOWN(boot_mem_map.map[i].addr +
348 boot_mem_map.map[i].size);
349
350 if (pagenr >= addr && pagenr < end)
351 return 1;
352 }
353
354 return 0;
355 }
356
357 void __init paging_init(void)
358 {
359 #ifdef CONFIG_FLATMEM
360 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
361 #else /* SPARSEMEM */
362 unsigned long max_zone_pfns[MAX_NR_ZONES];
363 unsigned long lastpfn;
364 #endif /* CONFIG_FLATMEM */
365
366 cpu_early_probe_cache();
367
368 pagetable_init();
369
370 #ifdef CONFIG_HIGHMEM
371 kmap_init();
372 #endif
373 kmap_coherent_init();
374
375 #ifdef CONFIG_FLATMEM
376 #ifdef CONFIG_ZONE_DMA
377 if (min_low_pfn < MAX_DMA_PFN && MAX_DMA_PFN <= max_low_pfn) {
378 zones_size[ZONE_DMA] = MAX_DMA_PFN - min_low_pfn;
379 zones_size[ZONE_NORMAL] = max_low_pfn - MAX_DMA_PFN;
380 } else if (max_low_pfn < MAX_DMA_PFN)
381 zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
382 else
383 #endif /* CONFIG_ZONE_DMA */
384 zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
385
386 #ifdef CONFIG_HIGHMEM
387 zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn;
388
389
390 if (cpu_has_dc_aliases && zones_size[ZONE_HIGHMEM]) {
391 printk(KERN_WARNING "This processor doesn't support highmem."
392 " %ldk highmem ignored\n", zones_size[ZONE_HIGHMEM]);
393 zones_size[ZONE_HIGHMEM] = 0;
394 }
395 #endif /* CONFIG_HIGHMEM */
396
397 free_area_init(zones_size);
398
399 #else /* SPARSEMEM */
400
401 #ifdef CONFIG_ZONE_DMA
402 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
403 #endif /* CONFIG_ZONE_DMA */
404
405 #ifdef CONFIG_ZONE_DMA32
406 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
407 #endif /* CONFIG_ZONE_DMA32 */
408 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
409 lastpfn = max_low_pfn;
410
411 #ifdef CONFIG_HIGHMEM
412 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
413 lastpfn = highend_pfn;
414
415 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
416 printk(KERN_WARNING "This processor doesn't support highmem."
417 " %ldk highmem ignored\n",
418 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
419 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
420 lastpfn = max_low_pfn;
421 }
422 #endif /* CONFIG_HIGHMEM */
423
424 free_area_init_nodes(max_zone_pfns);
425 #endif /* CONFIG_FLATMEM */
426 }
427
428 static struct kcore_list kcore_mem, kcore_vmalloc;
429 #ifdef CONFIG_64BIT
430 static struct kcore_list kcore_kseg0;
431 #endif
432
433 void __init mem_init(void)
434 {
435 unsigned long codesize, reservedpages, datasize, initsize;
436 unsigned long tmp, ram;
437
438 #ifdef CONFIG_HIGHMEM
439 #ifdef CONFIG_DISCONTIGMEM
440 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
441 #endif
442 max_mapnr = max(max_low_pfn, highend_pfn);
443 #else
444 max_mapnr = max_low_pfn;
445 #endif
446 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
447
448 totalram_pages += free_all_bootmem();
449 totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
450
451 reservedpages = ram = 0;
452 for (tmp = 0; tmp < max_low_pfn; tmp++)
453 if (page_is_ram(tmp)) {
454 ram++;
455 if (PageReserved(pfn_to_page(tmp)))
456 reservedpages++;
457 }
458 num_physpages = ram;
459
460 #ifdef CONFIG_HIGHMEM
461 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
462 struct page *page;
463
464 if (!page_is_ram(tmp))
465 continue;
466
467 page = pfn_to_page(tmp);
468 ClearPageReserved(page);
469 init_page_count(page);
470 __free_page(page);
471 totalhigh_pages++;
472 }
473 totalram_pages += totalhigh_pages;
474 num_physpages += totalhigh_pages;
475 #endif
476
477 codesize = (unsigned long) &_etext - (unsigned long) &_text;
478 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
479 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
480
481 #ifdef CONFIG_64BIT
482 if ((unsigned long) &_text > (unsigned long) CKSEG0)
483 /* The -4 is a hack so that user tools don't have to handle
484 the overflow. */
485 kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
486 #endif
487 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
488 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
489 VMALLOC_END-VMALLOC_START);
490
491 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
492 "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
493 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
494 ram << (PAGE_SHIFT-10),
495 codesize >> 10,
496 reservedpages << (PAGE_SHIFT-10),
497 datasize >> 10,
498 initsize >> 10,
499 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
500 }
501 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
502
503 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
504 {
505 unsigned long pfn;
506
507 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
508 struct page *page = pfn_to_page(pfn);
509 void *addr = phys_to_virt(PFN_PHYS(pfn));
510
511 ClearPageReserved(page);
512 init_page_count(page);
513 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
514 __free_page(page);
515 totalram_pages++;
516 }
517 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
518 }
519
520 #ifdef CONFIG_BLK_DEV_INITRD
521 void free_initrd_mem(unsigned long start, unsigned long end)
522 {
523 free_init_pages("initrd memory",
524 virt_to_phys((void *)start),
525 virt_to_phys((void *)end));
526 }
527 #endif
528
529 void free_initmem(void)
530 {
531 prom_free_prom_memory();
532 free_init_pages("unused kernel memory",
533 __pa_symbol(&__init_begin),
534 __pa_symbol(&__init_end));
535 }
536
537 unsigned long pgd_current[NR_CPUS];
538 /*
539 * On 64-bit we've got three-level pagetables with a slightly
540 * different layout ...
541 */
542 #define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
543 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
544 #ifdef CONFIG_64BIT
545 #ifdef MODULE_START
546 pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
547 #endif
548 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
549 #endif
550 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
Tomato firmware and modifications.