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netlink: make validation more configurable for future strictness
[linux.git] / arch / mips / mm / init.c
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, [email protected] and Carsten Langgaard, [email protected]
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/memblock.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/bootinfo.h>
36 #include <asm/cachectl.h>
37 #include <asm/cpu.h>
38 #include <asm/dma.h>
39 #include <asm/kmap_types.h>
40 #include <asm/maar.h>
41 #include <asm/mmu_context.h>
42 #include <asm/sections.h>
43 #include <asm/pgtable.h>
44 #include <asm/pgalloc.h>
45 #include <asm/tlb.h>
46 #include <asm/fixmap.h>
47
48 /*
49  * We have up to 8 empty zeroed pages so we can map one of the right colour
50  * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
51  * where we have to avoid VCED / VECI exceptions for good performance at
52  * any price.  Since page is never written to after the initialization we
53  * don't have to care about aliases on other CPUs.
54  */
55 unsigned long empty_zero_page, zero_page_mask;
56 EXPORT_SYMBOL_GPL(empty_zero_page);
57 EXPORT_SYMBOL(zero_page_mask);
58
59 /*
60  * Not static inline because used by IP27 special magic initialization code
61  */
62 void setup_zero_pages(void)
63 {
64         unsigned int order, i;
65         struct page *page;
66
67         if (cpu_has_vce)
68                 order = 3;
69         else
70                 order = 0;
71
72         empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
73         if (!empty_zero_page)
74                 panic("Oh boy, that early out of memory?");
75
76         page = virt_to_page((void *)empty_zero_page);
77         split_page(page, order);
78         for (i = 0; i < (1 << order); i++, page++)
79                 mark_page_reserved(page);
80
81         zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
82 }
83
84 static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
85 {
86         enum fixed_addresses idx;
87         unsigned int uninitialized_var(old_mmid);
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         if (cpu_has_mmid) {
115                 old_mmid = read_c0_memorymapid();
116                 write_c0_memorymapid(MMID_KERNEL_WIRED);
117         }
118 #ifdef CONFIG_XPA
119         if (cpu_has_xpa) {
120                 entrylo = (pte.pte_low & _PFNX_MASK);
121                 writex_c0_entrylo0(entrylo);
122                 writex_c0_entrylo1(entrylo);
123         }
124 #endif
125         tlbidx = num_wired_entries();
126         write_c0_wired(tlbidx + 1);
127         write_c0_index(tlbidx);
128         mtc0_tlbw_hazard();
129         tlb_write_indexed();
130         tlbw_use_hazard();
131         write_c0_entryhi(old_ctx);
132         if (cpu_has_mmid)
133                 write_c0_memorymapid(old_mmid);
134         local_irq_restore(flags);
135
136         return (void*) vaddr;
137 }
138
139 void *kmap_coherent(struct page *page, unsigned long addr)
140 {
141         return __kmap_pgprot(page, addr, PAGE_KERNEL);
142 }
143
144 void *kmap_noncoherent(struct page *page, unsigned long addr)
145 {
146         return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
147 }
148
149 void kunmap_coherent(void)
150 {
151         unsigned int wired;
152         unsigned long flags, old_ctx;
153
154         local_irq_save(flags);
155         old_ctx = read_c0_entryhi();
156         wired = num_wired_entries() - 1;
157         write_c0_wired(wired);
158         write_c0_index(wired);
159         write_c0_entryhi(UNIQUE_ENTRYHI(wired));
160         write_c0_entrylo0(0);
161         write_c0_entrylo1(0);
162         mtc0_tlbw_hazard();
163         tlb_write_indexed();
164         tlbw_use_hazard();
165         write_c0_entryhi(old_ctx);
166         local_irq_restore(flags);
167         pagefault_enable();
168         preempt_enable();
169 }
170
171 void copy_user_highpage(struct page *to, struct page *from,
172         unsigned long vaddr, struct vm_area_struct *vma)
173 {
174         void *vfrom, *vto;
175
176         vto = kmap_atomic(to);
177         if (cpu_has_dc_aliases &&
178             page_mapcount(from) && !Page_dcache_dirty(from)) {
179                 vfrom = kmap_coherent(from, vaddr);
180                 copy_page(vto, vfrom);
181                 kunmap_coherent();
182         } else {
183                 vfrom = kmap_atomic(from);
184                 copy_page(vto, vfrom);
185                 kunmap_atomic(vfrom);
186         }
187         if ((!cpu_has_ic_fills_f_dc) ||
188             pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
189                 flush_data_cache_page((unsigned long)vto);
190         kunmap_atomic(vto);
191         /* Make sure this page is cleared on other CPU's too before using it */
192         smp_wmb();
193 }
194
195 void copy_to_user_page(struct vm_area_struct *vma,
196         struct page *page, unsigned long vaddr, void *dst, const void *src,
197         unsigned long len)
198 {
199         if (cpu_has_dc_aliases &&
200             page_mapcount(page) && !Page_dcache_dirty(page)) {
201                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
202                 memcpy(vto, src, len);
203                 kunmap_coherent();
204         } else {
205                 memcpy(dst, src, len);
206                 if (cpu_has_dc_aliases)
207                         SetPageDcacheDirty(page);
208         }
209         if (vma->vm_flags & VM_EXEC)
210                 flush_cache_page(vma, vaddr, page_to_pfn(page));
211 }
212
213 void copy_from_user_page(struct vm_area_struct *vma,
214         struct page *page, unsigned long vaddr, void *dst, const void *src,
215         unsigned long len)
216 {
217         if (cpu_has_dc_aliases &&
218             page_mapcount(page) && !Page_dcache_dirty(page)) {
219                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
220                 memcpy(dst, vfrom, len);
221                 kunmap_coherent();
222         } else {
223                 memcpy(dst, src, len);
224                 if (cpu_has_dc_aliases)
225                         SetPageDcacheDirty(page);
226         }
227 }
228 EXPORT_SYMBOL_GPL(copy_from_user_page);
229
230 void __init fixrange_init(unsigned long start, unsigned long end,
231         pgd_t *pgd_base)
232 {
233 #ifdef CONFIG_HIGHMEM
234         pgd_t *pgd;
235         pud_t *pud;
236         pmd_t *pmd;
237         pte_t *pte;
238         int i, j, k;
239         unsigned long vaddr;
240
241         vaddr = start;
242         i = __pgd_offset(vaddr);
243         j = __pud_offset(vaddr);
244         k = __pmd_offset(vaddr);
245         pgd = pgd_base + i;
246
247         for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
248                 pud = (pud_t *)pgd;
249                 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
250                         pmd = (pmd_t *)pud;
251                         for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
252                                 if (pmd_none(*pmd)) {
253                                         pte = (pte_t *) memblock_alloc_low(PAGE_SIZE,
254                                                                            PAGE_SIZE);
255                                         if (!pte)
256                                                 panic("%s: Failed to allocate %lu bytes align=%lx\n",
257                                                       __func__, PAGE_SIZE,
258                                                       PAGE_SIZE);
259
260                                         set_pmd(pmd, __pmd((unsigned long)pte));
261                                         BUG_ON(pte != pte_offset_kernel(pmd, 0));
262                                 }
263                                 vaddr += PMD_SIZE;
264                         }
265                         k = 0;
266                 }
267                 j = 0;
268         }
269 #endif
270 }
271
272 unsigned __weak platform_maar_init(unsigned num_pairs)
273 {
274         struct maar_config cfg[BOOT_MEM_MAP_MAX];
275         unsigned i, num_configured, num_cfg = 0;
276
277         for (i = 0; i < boot_mem_map.nr_map; i++) {
278                 switch (boot_mem_map.map[i].type) {
279                 case BOOT_MEM_RAM:
280                 case BOOT_MEM_INIT_RAM:
281                         break;
282                 default:
283                         continue;
284                 }
285
286                 /* Round lower up */
287                 cfg[num_cfg].lower = boot_mem_map.map[i].addr;
288                 cfg[num_cfg].lower = (cfg[num_cfg].lower + 0xffff) & ~0xffff;
289
290                 /* Round upper down */
291                 cfg[num_cfg].upper = boot_mem_map.map[i].addr +
292                                         boot_mem_map.map[i].size;
293                 cfg[num_cfg].upper = (cfg[num_cfg].upper & ~0xffff) - 1;
294
295                 cfg[num_cfg].attrs = MIPS_MAAR_S;
296                 num_cfg++;
297         }
298
299         num_configured = maar_config(cfg, num_cfg, num_pairs);
300         if (num_configured < num_cfg)
301                 pr_warn("Not enough MAAR pairs (%u) for all bootmem regions (%u)\n",
302                         num_pairs, num_cfg);
303
304         return num_configured;
305 }
306
307 void maar_init(void)
308 {
309         unsigned num_maars, used, i;
310         phys_addr_t lower, upper, attr;
311         static struct {
312                 struct maar_config cfgs[3];
313                 unsigned used;
314         } recorded = { { { 0 } }, 0 };
315
316         if (!cpu_has_maar)
317                 return;
318
319         /* Detect the number of MAARs */
320         write_c0_maari(~0);
321         back_to_back_c0_hazard();
322         num_maars = read_c0_maari() + 1;
323
324         /* MAARs should be in pairs */
325         WARN_ON(num_maars % 2);
326
327         /* Set MAARs using values we recorded already */
328         if (recorded.used) {
329                 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
330                 BUG_ON(used != recorded.used);
331         } else {
332                 /* Configure the required MAARs */
333                 used = platform_maar_init(num_maars / 2);
334         }
335
336         /* Disable any further MAARs */
337         for (i = (used * 2); i < num_maars; i++) {
338                 write_c0_maari(i);
339                 back_to_back_c0_hazard();
340                 write_c0_maar(0);
341                 back_to_back_c0_hazard();
342         }
343
344         if (recorded.used)
345                 return;
346
347         pr_info("MAAR configuration:\n");
348         for (i = 0; i < num_maars; i += 2) {
349                 write_c0_maari(i);
350                 back_to_back_c0_hazard();
351                 upper = read_c0_maar();
352
353                 write_c0_maari(i + 1);
354                 back_to_back_c0_hazard();
355                 lower = read_c0_maar();
356
357                 attr = lower & upper;
358                 lower = (lower & MIPS_MAAR_ADDR) << 4;
359                 upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
360
361                 pr_info("  [%d]: ", i / 2);
362                 if (!(attr & MIPS_MAAR_VL)) {
363                         pr_cont("disabled\n");
364                         continue;
365                 }
366
367                 pr_cont("%pa-%pa", &lower, &upper);
368
369                 if (attr & MIPS_MAAR_S)
370                         pr_cont(" speculate");
371
372                 pr_cont("\n");
373
374                 /* Record the setup for use on secondary CPUs */
375                 if (used <= ARRAY_SIZE(recorded.cfgs)) {
376                         recorded.cfgs[recorded.used].lower = lower;
377                         recorded.cfgs[recorded.used].upper = upper;
378                         recorded.cfgs[recorded.used].attrs = attr;
379                         recorded.used++;
380                 }
381         }
382 }
383
384 #ifndef CONFIG_NEED_MULTIPLE_NODES
385 int page_is_ram(unsigned long pagenr)
386 {
387         int i;
388
389         for (i = 0; i < boot_mem_map.nr_map; i++) {
390                 unsigned long addr, end;
391
392                 switch (boot_mem_map.map[i].type) {
393                 case BOOT_MEM_RAM:
394                 case BOOT_MEM_INIT_RAM:
395                         break;
396                 default:
397                         /* not usable memory */
398                         continue;
399                 }
400
401                 addr = PFN_UP(boot_mem_map.map[i].addr);
402                 end = PFN_DOWN(boot_mem_map.map[i].addr +
403                                boot_mem_map.map[i].size);
404
405                 if (pagenr >= addr && pagenr < end)
406                         return 1;
407         }
408
409         return 0;
410 }
411
412 void __init paging_init(void)
413 {
414         unsigned long max_zone_pfns[MAX_NR_ZONES];
415
416         pagetable_init();
417
418 #ifdef CONFIG_HIGHMEM
419         kmap_init();
420 #endif
421 #ifdef CONFIG_ZONE_DMA
422         max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
423 #endif
424 #ifdef CONFIG_ZONE_DMA32
425         max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
426 #endif
427         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
428 #ifdef CONFIG_HIGHMEM
429         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
430
431         if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
432                 printk(KERN_WARNING "This processor doesn't support highmem."
433                        " %ldk highmem ignored\n",
434                        (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
435                 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
436         }
437 #endif
438
439         free_area_init_nodes(max_zone_pfns);
440 }
441
442 #ifdef CONFIG_64BIT
443 static struct kcore_list kcore_kseg0;
444 #endif
445
446 static inline void mem_init_free_highmem(void)
447 {
448 #ifdef CONFIG_HIGHMEM
449         unsigned long tmp;
450
451         if (cpu_has_dc_aliases)
452                 return;
453
454         for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
455                 struct page *page = pfn_to_page(tmp);
456
457                 if (!page_is_ram(tmp))
458                         SetPageReserved(page);
459                 else
460                         free_highmem_page(page);
461         }
462 #endif
463 }
464
465 void __init mem_init(void)
466 {
467 #ifdef CONFIG_HIGHMEM
468 #ifdef CONFIG_DISCONTIGMEM
469 #error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
470 #endif
471         max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
472 #else
473         max_mapnr = max_low_pfn;
474 #endif
475         high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
476
477         maar_init();
478         memblock_free_all();
479         setup_zero_pages();     /* Setup zeroed pages.  */
480         mem_init_free_highmem();
481         mem_init_print_info(NULL);
482
483 #ifdef CONFIG_64BIT
484         if ((unsigned long) &_text > (unsigned long) CKSEG0)
485                 /* The -4 is a hack so that user tools don't have to handle
486                    the overflow.  */
487                 kclist_add(&kcore_kseg0, (void *) CKSEG0,
488                                 0x80000000 - 4, KCORE_TEXT);
489 #endif
490 }
491 #endif /* !CONFIG_NEED_MULTIPLE_NODES */
492
493 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
494 {
495         unsigned long pfn;
496
497         for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
498                 struct page *page = pfn_to_page(pfn);
499                 void *addr = phys_to_virt(PFN_PHYS(pfn));
500
501                 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
502                 free_reserved_page(page);
503         }
504         printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
505 }
506
507 #ifdef CONFIG_BLK_DEV_INITRD
508 void free_initrd_mem(unsigned long start, unsigned long end)
509 {
510         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
511                            "initrd");
512 }
513 #endif
514
515 void (*free_init_pages_eva)(void *begin, void *end) = NULL;
516
517 void __ref free_initmem(void)
518 {
519         prom_free_prom_memory();
520         /*
521          * Let the platform define a specific function to free the
522          * init section since EVA may have used any possible mapping
523          * between virtual and physical addresses.
524          */
525         if (free_init_pages_eva)
526                 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
527         else
528                 free_initmem_default(POISON_FREE_INITMEM);
529 }
530
531 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
532 unsigned long pgd_current[NR_CPUS];
533 #endif
534
535 /*
536  * Align swapper_pg_dir in to 64K, allows its address to be loaded
537  * with a single LUI instruction in the TLB handlers.  If we used
538  * __aligned(64K), its size would get rounded up to the alignment
539  * size, and waste space.  So we place it in its own section and align
540  * it in the linker script.
541  */
542 pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
543 #ifndef __PAGETABLE_PUD_FOLDED
544 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
545 #endif
546 #ifndef __PAGETABLE_PMD_FOLDED
547 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
548 EXPORT_SYMBOL_GPL(invalid_pmd_table);
549 #endif
550 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
551 EXPORT_SYMBOL(invalid_pte_table);
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