Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | */ | |
1da177e4 LT |
11 | #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> | |
3d503753 | 26 | #include <linux/proc_fs.h> |
22a9835c | 27 | #include <linux/pfn.h> |
1da177e4 LT |
28 | |
29 | #include <asm/bootinfo.h> | |
30 | #include <asm/cachectl.h> | |
31 | #include <asm/cpu.h> | |
32 | #include <asm/dma.h> | |
f8829cae | 33 | #include <asm/kmap_types.h> |
1da177e4 LT |
34 | #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> | |
f8829cae RB |
39 | #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 */ | |
1da177e4 LT |
61 | |
62 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
63 | ||
64 | unsigned 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 | */ | |
73 | unsigned long empty_zero_page, zero_page_mask; | |
74 | ||
75 | /* | |
76 | * Not static inline because used by IP27 special magic initialization code | |
77 | */ | |
78 | unsigned long setup_zero_pages(void) | |
79 | { | |
8dfcc9ba NP |
80 | unsigned int order; |
81 | unsigned long size; | |
1da177e4 LT |
82 | 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 | ||
99e3b942 | 93 | page = virt_to_page((void *)empty_zero_page); |
8dfcc9ba | 94 | split_page(page, order); |
99e3b942 | 95 | while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) { |
68352e6e | 96 | SetPageReserved(page); |
1da177e4 LT |
97 | page++; |
98 | } | |
99 | ||
100 | size = PAGE_SIZE << order; | |
101 | zero_page_mask = (size - 1) & PAGE_MASK; | |
102 | ||
103 | return 1UL << order; | |
104 | } | |
105 | ||
f8829cae RB |
106 | /* |
107 | * These are almost like kmap_atomic / kunmap_atmic except they take an | |
108 | * additional address argument as the hint. | |
109 | */ | |
1da177e4 LT |
110 | |
111 | #define kmap_get_fixmap_pte(vaddr) \ | |
c6e8b587 | 112 | pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr)) |
1da177e4 | 113 | |
f8829cae RB |
114 | #ifdef CONFIG_MIPS_MT_SMTC |
115 | static pte_t *kmap_coherent_pte; | |
116 | static 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 | |
125 | static inline void kmap_coherent_init(void) {} | |
126 | #endif | |
127 | ||
128 | static 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 | ||
182 | static 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 | ||
206 | void 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 | ||
220 | EXPORT_SYMBOL(copy_to_user_page); | |
221 | ||
222 | void 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 | ||
235 | EXPORT_SYMBOL(copy_from_user_page); | |
236 | ||
237 | ||
238 | #ifdef CONFIG_HIGHMEM | |
239 | pte_t *kmap_pte; | |
240 | pgprot_t kmap_prot; | |
241 | ||
1da177e4 LT |
242 | static 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 | } | |
f8829cae | 252 | #endif /* CONFIG_HIGHMEM */ |
1da177e4 | 253 | |
84fd089a | 254 | void __init fixrange_init(unsigned long start, unsigned long end, |
1da177e4 LT |
255 | pgd_t *pgd_base) |
256 | { | |
f8829cae | 257 | #if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC) |
1da177e4 | 258 | pgd_t *pgd; |
c6e8b587 | 259 | pud_t *pud; |
1da177e4 LT |
260 | pmd_t *pmd; |
261 | pte_t *pte; | |
c6e8b587 | 262 | int i, j, k; |
1da177e4 LT |
263 | unsigned long vaddr; |
264 | ||
265 | vaddr = start; | |
266 | i = __pgd_offset(vaddr); | |
c6e8b587 RB |
267 | j = __pud_offset(vaddr); |
268 | k = __pmd_offset(vaddr); | |
1da177e4 LT |
269 | pgd = pgd_base + i; |
270 | ||
271 | for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { | |
c6e8b587 RB |
272 | 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); | |
f8829cae | 278 | set_pmd(pmd, __pmd((unsigned long)pte)); |
c6e8b587 RB |
279 | if (pte != pte_offset_kernel(pmd, 0)) |
280 | BUG(); | |
281 | } | |
282 | vaddr += PMD_SIZE; | |
1da177e4 | 283 | } |
c6e8b587 | 284 | k = 0; |
1da177e4 LT |
285 | } |
286 | j = 0; | |
287 | } | |
f8829cae | 288 | #endif |
1da177e4 | 289 | } |
1da177e4 | 290 | |
b4819b59 | 291 | #ifndef CONFIG_NEED_MULTIPLE_NODES |
1da177e4 LT |
292 | extern void pagetable_init(void); |
293 | ||
565200a1 AN |
294 | static 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 | ||
1da177e4 LT |
316 | void __init paging_init(void) |
317 | { | |
b58e5d05 | 318 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; |
1da177e4 | 319 | unsigned long max_dma, high, low; |
565200a1 | 320 | #ifndef CONFIG_FLATMEM |
b58e5d05 | 321 | unsigned long zholes_size[MAX_NR_ZONES] = { 0, }; |
565200a1 AN |
322 | unsigned long i, j, pfn; |
323 | #endif | |
1da177e4 LT |
324 | |
325 | pagetable_init(); | |
326 | ||
327 | #ifdef CONFIG_HIGHMEM | |
328 | kmap_init(); | |
329 | #endif | |
f8829cae | 330 | kmap_coherent_init(); |
1da177e4 LT |
331 | |
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 | ||
565200a1 | 356 | #ifdef CONFIG_FLATMEM |
1da177e4 | 357 | free_area_init(zones_size); |
565200a1 AN |
358 | #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 | |
1da177e4 LT |
366 | } |
367 | ||
3d503753 DJ |
368 | static struct kcore_list kcore_mem, kcore_vmalloc; |
369 | #ifdef CONFIG_64BIT | |
370 | static struct kcore_list kcore_kseg0; | |
371 | #endif | |
372 | ||
1da177e4 LT |
373 | void __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 | |
565200a1 | 382 | max_mapnr = highend_pfn; |
1da177e4 | 383 | #else |
565200a1 | 384 | max_mapnr = max_low_pfn; |
1da177e4 LT |
385 | #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++; | |
b1c231f5 | 395 | if (PageReserved(pfn_to_page(tmp))) |
1da177e4 LT |
396 | reservedpages++; |
397 | } | |
565200a1 | 398 | num_physpages = ram; |
1da177e4 LT |
399 | |
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 | |
7835e98b | 412 | init_page_count(page); |
1da177e4 LT |
413 | __free_page(page); |
414 | totalhigh_pages++; | |
415 | } | |
416 | totalram_pages += totalhigh_pages; | |
565200a1 | 417 | num_physpages += totalhigh_pages; |
1da177e4 LT |
418 | #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 | ||
3d503753 DJ |
424 | #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 | ||
1da177e4 LT |
434 | 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 | } | |
b4819b59 | 444 | #endif /* !CONFIG_NEED_MULTIPLE_NODES */ |
1da177e4 | 445 | |
acd86b86 | 446 | static void free_init_pages(char *what, unsigned long begin, unsigned long end) |
6fd11a21 | 447 | { |
acd86b86 | 448 | unsigned long pfn; |
6fd11a21 | 449 | |
acd86b86 FBH |
450 | for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) { |
451 | struct page *page = pfn_to_page(pfn); | |
452 | void *addr = phys_to_virt(PFN_PHYS(pfn)); | |
453 | ||
454 | ClearPageReserved(page); | |
455 | init_page_count(page); | |
456 | memset(addr, POISON_FREE_INITMEM, PAGE_SIZE); | |
457 | __free_page(page); | |
6fd11a21 RB |
458 | totalram_pages++; |
459 | } | |
460 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); | |
461 | } | |
462 | ||
1da177e4 LT |
463 | #ifdef CONFIG_BLK_DEV_INITRD |
464 | void free_initrd_mem(unsigned long start, unsigned long end) | |
465 | { | |
acd86b86 FBH |
466 | free_init_pages("initrd memory", |
467 | virt_to_phys((void *)start), | |
468 | virt_to_phys((void *)end)); | |
1da177e4 LT |
469 | } |
470 | #endif | |
471 | ||
472 | extern unsigned long prom_free_prom_memory(void); | |
473 | ||
474 | void free_initmem(void) | |
475 | { | |
acd86b86 | 476 | unsigned long freed; |
1da177e4 LT |
477 | |
478 | freed = prom_free_prom_memory(); | |
6fd11a21 RB |
479 | if (freed) |
480 | printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed); | |
1da177e4 | 481 | |
acd86b86 FBH |
482 | free_init_pages("unused kernel memory", |
483 | __pa_symbol(&__init_begin), | |
484 | __pa_symbol(&__init_end)); | |
1da177e4 | 485 | } |