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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
50
51
52
53
54
55unsigned long empty_zero_page, zero_page_mask;
56EXPORT_SYMBOL_GPL(empty_zero_page);
57EXPORT_SYMBOL(zero_page_mask);
58
59
60
61
62void 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
84static 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
139void *kmap_coherent(struct page *page, unsigned long addr)
140{
141 return __kmap_pgprot(page, addr, PAGE_KERNEL);
142}
143
144void *kmap_noncoherent(struct page *page, unsigned long addr)
145{
146 return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
147}
148
149void 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
171void 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
192 smp_wmb();
193}
194
195void 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
213void 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}
228EXPORT_SYMBOL_GPL(copy_from_user_page);
229
230void __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
272unsigned __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
287 cfg[num_cfg].lower = boot_mem_map.map[i].addr;
288 cfg[num_cfg].lower = (cfg[num_cfg].lower + 0xffff) & ~0xffff;
289
290
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
307void 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
320 write_c0_maari(~0);
321 back_to_back_c0_hazard();
322 num_maars = read_c0_maari() + 1;
323
324
325 WARN_ON(num_maars % 2);
326
327
328 if (recorded.used) {
329 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
330 BUG_ON(used != recorded.used);
331 } else {
332
333 used = platform_maar_init(num_maars / 2);
334 }
335
336
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
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
385int 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
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
412void __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
443static struct kcore_list kcore_kseg0;
444#endif
445
446static 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
465void __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();
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
486
487 kclist_add(&kcore_kseg0, (void *) CKSEG0,
488 0x80000000 - 4, KCORE_TEXT);
489#endif
490}
491#endif
492
493void 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
507void (*free_init_pages_eva)(void *begin, void *end) = NULL;
508
509void __ref free_initmem(void)
510{
511 prom_free_prom_memory();
512
513
514
515
516
517 if (free_init_pages_eva)
518 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
519 else
520 free_initmem_default(POISON_FREE_INITMEM);
521}
522
523#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
524unsigned long pgd_current[NR_CPUS];
525#endif
526
527
528
529
530
531
532
533
534pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
535#ifndef __PAGETABLE_PUD_FOLDED
536pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
537#endif
538#ifndef __PAGETABLE_PMD_FOLDED
539pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
540EXPORT_SYMBOL_GPL(invalid_pmd_table);
541#endif
542pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
543EXPORT_SYMBOL(invalid_pte_table);
544
