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Linux/arch/mips/mm/init.c

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  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/export.h>
 14 #include <linux/signal.h>
 15 #include <linux/sched.h>
 16 #include <linux/smp.h>
 17 #include <linux/kernel.h>
 18 #include <linux/errno.h>
 19 #include <linux/string.h>
 20 #include <linux/types.h>
 21 #include <linux/pagemap.h>
 22 #include <linux/ptrace.h>
 23 #include <linux/mman.h>
 24 #include <linux/mm.h>
 25 #include <linux/bootmem.h>
 26 #include <linux/highmem.h>
 27 #include <linux/swap.h>
 28 #include <linux/proc_fs.h>
 29 #include <linux/pfn.h>
 30 #include <linux/hardirq.h>
 31 #include <linux/gfp.h>
 32 #include <linux/kcore.h>
 33 #include <linux/initrd.h>
 34 
 35 #include <asm/asm-offsets.h>
 36 #include <asm/bootinfo.h>
 37 #include <asm/cachectl.h>
 38 #include <asm/cpu.h>
 39 #include <asm/dma.h>
 40 #include <asm/kmap_types.h>
 41 #include <asm/maar.h>
 42 #include <asm/mmu_context.h>
 43 #include <asm/sections.h>
 44 #include <asm/pgtable.h>
 45 #include <asm/pgalloc.h>
 46 #include <asm/tlb.h>
 47 #include <asm/fixmap.h>
 48 
 49 /*
 50  * We have up to 8 empty zeroed pages so we can map one of the right colour
 51  * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
 52  * where we have to avoid VCED / VECI exceptions for good performance at
 53  * any price.  Since page is never written to after the initialization we
 54  * don't have to care about aliases on other CPUs.
 55  */
 56 unsigned long empty_zero_page, zero_page_mask;
 57 EXPORT_SYMBOL_GPL(empty_zero_page);
 58 EXPORT_SYMBOL(zero_page_mask);
 59 
 60 /*
 61  * Not static inline because used by IP27 special magic initialization code
 62  */
 63 void setup_zero_pages(void)
 64 {
 65         unsigned int order, i;
 66         struct page *page;
 67 
 68         if (cpu_has_vce)
 69                 order = 3;
 70         else
 71                 order = 0;
 72 
 73         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 74         if (!empty_zero_page)
 75                 panic("Oh boy, that early out of memory?");
 76 
 77         page = virt_to_page((void *)empty_zero_page);
 78         split_page(page, order);
 79         for (i = 0; i < (1 << order); i++, page++)
 80                 mark_page_reserved(page);
 81 
 82         zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
 83 }
 84 
 85 static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
 86 {
 87         enum fixed_addresses idx;
 88         unsigned long vaddr, flags, entrylo;
 89         unsigned long old_ctx;
 90         pte_t pte;
 91         int tlbidx;
 92 
 93         BUG_ON(Page_dcache_dirty(page));
 94 
 95         preempt_disable();
 96         pagefault_disable();
 97         idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
 98         idx += in_interrupt() ? FIX_N_COLOURS : 0;
 99         vaddr = __fix_to_virt(FIX_CMAP_END - idx);
100         pte = mk_pte(page, prot);
101 #if defined(CONFIG_XPA)
102         entrylo = pte_to_entrylo(pte.pte_high);
103 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
104         entrylo = pte.pte_high;
105 #else
106         entrylo = pte_to_entrylo(pte_val(pte));
107 #endif
108 
109         local_irq_save(flags);
110         old_ctx = read_c0_entryhi();
111         write_c0_entryhi(vaddr & (PAGE_MASK << 1));
112         write_c0_entrylo0(entrylo);
113         write_c0_entrylo1(entrylo);
114 #ifdef CONFIG_XPA
115         if (cpu_has_xpa) {
116                 entrylo = (pte.pte_low & _PFNX_MASK);
117                 writex_c0_entrylo0(entrylo);
118                 writex_c0_entrylo1(entrylo);
119         }
120 #endif
121         tlbidx = num_wired_entries();
122         write_c0_wired(tlbidx + 1);
123         write_c0_index(tlbidx);
124         mtc0_tlbw_hazard();
125         tlb_write_indexed();
126         tlbw_use_hazard();
127         write_c0_entryhi(old_ctx);
128         local_irq_restore(flags);
129 
130         return (void*) vaddr;
131 }
132 
133 void *kmap_coherent(struct page *page, unsigned long addr)
134 {
135         return __kmap_pgprot(page, addr, PAGE_KERNEL);
136 }
137 
138 void *kmap_noncoherent(struct page *page, unsigned long addr)
139 {
140         return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
141 }
142 
143 void kunmap_coherent(void)
144 {
145         unsigned int wired;
146         unsigned long flags, old_ctx;
147 
148         local_irq_save(flags);
149         old_ctx = read_c0_entryhi();
150         wired = num_wired_entries() - 1;
151         write_c0_wired(wired);
152         write_c0_index(wired);
153         write_c0_entryhi(UNIQUE_ENTRYHI(wired));
154         write_c0_entrylo0(0);
155         write_c0_entrylo1(0);
156         mtc0_tlbw_hazard();
157         tlb_write_indexed();
158         tlbw_use_hazard();
159         write_c0_entryhi(old_ctx);
160         local_irq_restore(flags);
161         pagefault_enable();
162         preempt_enable();
163 }
164 
165 void copy_user_highpage(struct page *to, struct page *from,
166         unsigned long vaddr, struct vm_area_struct *vma)
167 {
168         void *vfrom, *vto;
169 
170         vto = kmap_atomic(to);
171         if (cpu_has_dc_aliases &&
172             page_mapcount(from) && !Page_dcache_dirty(from)) {
173                 vfrom = kmap_coherent(from, vaddr);
174                 copy_page(vto, vfrom);
175                 kunmap_coherent();
176         } else {
177                 vfrom = kmap_atomic(from);
178                 copy_page(vto, vfrom);
179                 kunmap_atomic(vfrom);
180         }
181         if ((!cpu_has_ic_fills_f_dc) ||
182             pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
183                 flush_data_cache_page((unsigned long)vto);
184         kunmap_atomic(vto);
185         /* Make sure this page is cleared on other CPU's too before using it */
186         smp_wmb();
187 }
188 
189 void copy_to_user_page(struct vm_area_struct *vma,
190         struct page *page, unsigned long vaddr, void *dst, const void *src,
191         unsigned long len)
192 {
193         if (cpu_has_dc_aliases &&
194             page_mapcount(page) && !Page_dcache_dirty(page)) {
195                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
196                 memcpy(vto, src, len);
197                 kunmap_coherent();
198         } else {
199                 memcpy(dst, src, len);
200                 if (cpu_has_dc_aliases)
201                         SetPageDcacheDirty(page);
202         }
203         if (vma->vm_flags & VM_EXEC)
204                 flush_cache_page(vma, vaddr, page_to_pfn(page));
205 }
206 
207 void copy_from_user_page(struct vm_area_struct *vma,
208         struct page *page, unsigned long vaddr, void *dst, const void *src,
209         unsigned long len)
210 {
211         if (cpu_has_dc_aliases &&
212             page_mapcount(page) && !Page_dcache_dirty(page)) {
213                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
214                 memcpy(dst, vfrom, len);
215                 kunmap_coherent();
216         } else {
217                 memcpy(dst, src, len);
218                 if (cpu_has_dc_aliases)
219                         SetPageDcacheDirty(page);
220         }
221 }
222 EXPORT_SYMBOL_GPL(copy_from_user_page);
223 
224 void __init fixrange_init(unsigned long start, unsigned long end,
225         pgd_t *pgd_base)
226 {
227 #ifdef CONFIG_HIGHMEM
228         pgd_t *pgd;
229         pud_t *pud;
230         pmd_t *pmd;
231         pte_t *pte;
232         int i, j, k;
233         unsigned long vaddr;
234 
235         vaddr = start;
236         i = __pgd_offset(vaddr);
237         j = __pud_offset(vaddr);
238         k = __pmd_offset(vaddr);
239         pgd = pgd_base + i;
240 
241         for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
242                 pud = (pud_t *)pgd;
243                 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
244                         pmd = (pmd_t *)pud;
245                         for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
246                                 if (pmd_none(*pmd)) {
247                                         pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
248                                         set_pmd(pmd, __pmd((unsigned long)pte));
249                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
250                                 }
251                                 vaddr += PMD_SIZE;
252                         }
253                         k = 0;
254                 }
255                 j = 0;
256         }
257 #endif
258 }
259 
260 unsigned __weak platform_maar_init(unsigned num_pairs)
261 {
262         struct maar_config cfg[BOOT_MEM_MAP_MAX];
263         unsigned i, num_configured, num_cfg = 0;
264 
265         for (i = 0; i < boot_mem_map.nr_map; i++) {
266                 switch (boot_mem_map.map[i].type) {
267                 case BOOT_MEM_RAM:
268                 case BOOT_MEM_INIT_RAM:
269                         break;
270                 default:
271                         continue;
272                 }
273 
274                 /* Round lower up */
275                 cfg[num_cfg].lower = boot_mem_map.map[i].addr;
276                 cfg[num_cfg].lower = (cfg[num_cfg].lower + 0xffff) & ~0xffff;
277 
278                 /* Round upper down */
279                 cfg[num_cfg].upper = boot_mem_map.map[i].addr +
280                                         boot_mem_map.map[i].size;
281                 cfg[num_cfg].upper = (cfg[num_cfg].upper & ~0xffff) - 1;
282 
283                 cfg[num_cfg].attrs = MIPS_MAAR_S;
284                 num_cfg++;
285         }
286 
287         num_configured = maar_config(cfg, num_cfg, num_pairs);
288         if (num_configured < num_cfg)
289                 pr_warn("Not enough MAAR pairs (%u) for all bootmem regions (%u)\n",
290                         num_pairs, num_cfg);
291 
292         return num_configured;
293 }
294 
295 void maar_init(void)
296 {
297         unsigned num_maars, used, i;
298         phys_addr_t lower, upper, attr;
299         static struct {
300                 struct maar_config cfgs[3];
301                 unsigned used;
302         } recorded = { { { 0 } }, 0 };
303 
304         if (!cpu_has_maar)
305                 return;
306 
307         /* Detect the number of MAARs */
308         write_c0_maari(~0);
309         back_to_back_c0_hazard();
310         num_maars = read_c0_maari() + 1;
311 
312         /* MAARs should be in pairs */
313         WARN_ON(num_maars % 2);
314 
315         /* Set MAARs using values we recorded already */
316         if (recorded.used) {
317                 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
318                 BUG_ON(used != recorded.used);
319         } else {
320                 /* Configure the required MAARs */
321                 used = platform_maar_init(num_maars / 2);
322         }
323 
324         /* Disable any further MAARs */
325         for (i = (used * 2); i < num_maars; i++) {
326                 write_c0_maari(i);
327                 back_to_back_c0_hazard();
328                 write_c0_maar(0);
329                 back_to_back_c0_hazard();
330         }
331 
332         if (recorded.used)
333                 return;
334 
335         pr_info("MAAR configuration:\n");
336         for (i = 0; i < num_maars; i += 2) {
337                 write_c0_maari(i);
338                 back_to_back_c0_hazard();
339                 upper = read_c0_maar();
340 
341                 write_c0_maari(i + 1);
342                 back_to_back_c0_hazard();
343                 lower = read_c0_maar();
344 
345                 attr = lower & upper;
346                 lower = (lower & MIPS_MAAR_ADDR) << 4;
347                 upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
348 
349                 pr_info("  [%d]: ", i / 2);
350                 if (!(attr & MIPS_MAAR_VL)) {
351                         pr_cont("disabled\n");
352                         continue;
353                 }
354 
355                 pr_cont("%pa-%pa", &lower, &upper);
356 
357                 if (attr & MIPS_MAAR_S)
358                         pr_cont(" speculate");
359 
360                 pr_cont("\n");
361 
362                 /* Record the setup for use on secondary CPUs */
363                 if (used <= ARRAY_SIZE(recorded.cfgs)) {
364                         recorded.cfgs[recorded.used].lower = lower;
365                         recorded.cfgs[recorded.used].upper = upper;
366                         recorded.cfgs[recorded.used].attrs = attr;
367                         recorded.used++;
368                 }
369         }
370 }
371 
372 #ifndef CONFIG_NEED_MULTIPLE_NODES
373 int page_is_ram(unsigned long pagenr)
374 {
375         int i;
376 
377         for (i = 0; i < boot_mem_map.nr_map; i++) {
378                 unsigned long addr, end;
379 
380                 switch (boot_mem_map.map[i].type) {
381                 case BOOT_MEM_RAM:
382                 case BOOT_MEM_INIT_RAM:
383                         break;
384                 default:
385                         /* not usable memory */
386                         continue;
387                 }
388 
389                 addr = PFN_UP(boot_mem_map.map[i].addr);
390                 end = PFN_DOWN(boot_mem_map.map[i].addr +
391                                boot_mem_map.map[i].size);
392 
393                 if (pagenr >= addr && pagenr < end)
394                         return 1;
395         }
396 
397         return 0;
398 }
399 
400 void __init paging_init(void)
401 {
402         unsigned long max_zone_pfns[MAX_NR_ZONES];
403 
404         pagetable_init();
405 
406 #ifdef CONFIG_HIGHMEM
407         kmap_init();
408 #endif
409 #ifdef CONFIG_ZONE_DMA
410         max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
411 #endif
412 #ifdef CONFIG_ZONE_DMA32
413         max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
414 #endif
415         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
416 #ifdef CONFIG_HIGHMEM
417         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
418 
419         if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
420                 printk(KERN_WARNING "This processor doesn't support highmem."
421                        " %ldk highmem ignored\n",
422                        (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
423                 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
424         }
425 #endif
426 
427         free_area_init_nodes(max_zone_pfns);
428 }
429 
430 #ifdef CONFIG_64BIT
431 static struct kcore_list kcore_kseg0;
432 #endif
433 
434 static inline void mem_init_free_highmem(void)
435 {
436 #ifdef CONFIG_HIGHMEM
437         unsigned long tmp;
438 
439         if (cpu_has_dc_aliases)
440                 return;
441 
442         for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
443                 struct page *page = pfn_to_page(tmp);
444 
445                 if (!page_is_ram(tmp))
446                         SetPageReserved(page);
447                 else
448                         free_highmem_page(page);
449         }
450 #endif
451 }
452 
453 void __init mem_init(void)
454 {
455 #ifdef CONFIG_HIGHMEM
456 #ifdef CONFIG_DISCONTIGMEM
457 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
458 #endif
459         max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
460 #else
461         max_mapnr = max_low_pfn;
462 #endif
463         high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
464 
465         maar_init();
466         free_all_bootmem();
467         setup_zero_pages();     /* Setup zeroed pages.  */
468         mem_init_free_highmem();
469         mem_init_print_info(NULL);
470 
471 #ifdef CONFIG_64BIT
472         if ((unsigned long) &_text > (unsigned long) CKSEG0)
473                 /* The -4 is a hack so that user tools don't have to handle
474                    the overflow.  */
475                 kclist_add(&kcore_kseg0, (void *) CKSEG0,
476                                 0x80000000 - 4, KCORE_TEXT);
477 #endif
478 }
479 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
480 
481 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
482 {
483         unsigned long pfn;
484 
485         for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
486                 struct page *page = pfn_to_page(pfn);
487                 void *addr = phys_to_virt(PFN_PHYS(pfn));
488 
489                 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
490                 free_reserved_page(page);
491         }
492         printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
493 }
494 
495 #ifdef CONFIG_BLK_DEV_INITRD
496 void free_initrd_mem(unsigned long start, unsigned long end)
497 {
498         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
499                            "initrd");
500 }
501 #endif
502 
503 void (*free_init_pages_eva)(void *begin, void *end) = NULL;
504 
505 void __ref free_initmem(void)
506 {
507         prom_free_prom_memory();
508         /*
509          * Let the platform define a specific function to free the
510          * init section since EVA may have used any possible mapping
511          * between virtual and physical addresses.
512          */
513         if (free_init_pages_eva)
514                 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
515         else
516                 free_initmem_default(POISON_FREE_INITMEM);
517 }
518 
519 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
520 unsigned long pgd_current[NR_CPUS];
521 #endif
522 
523 /*
524  * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
525  * are constants.  So we use the variants from asm-offset.h until that gcc
526  * will officially be retired.
527  *
528  * Align swapper_pg_dir in to 64K, allows its address to be loaded
529  * with a single LUI instruction in the TLB handlers.  If we used
530  * __aligned(64K), its size would get rounded up to the alignment
531  * size, and waste space.  So we place it in its own section and align
532  * it in the linker script.
533  */
534 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
535 #ifndef __PAGETABLE_PUD_FOLDED
536 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
537 #endif
538 #ifndef __PAGETABLE_PMD_FOLDED
539 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
540 EXPORT_SYMBOL_GPL(invalid_pmd_table);
541 #endif
542 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
543 EXPORT_SYMBOL(invalid_pte_table);
544 

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