This source file includes following definitions.
- setup_zero_pages
- __kmap_pgprot
- kmap_coherent
- kmap_noncoherent
- kunmap_coherent
- copy_user_highpage
- copy_to_user_page
- copy_from_user_page
- fixrange_init
- maar_res_walk
- platform_maar_init
- maar_init
- paging_init
- mem_init_free_highmem
- mem_init
- free_init_pages
- free_initmem
1
2
3
4
5
6
7
8
9
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
50
51
52
53
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
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
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 struct maar_walk_info {
273 struct maar_config cfg[16];
274 unsigned int num_cfg;
275 };
276
277 static int maar_res_walk(unsigned long start_pfn, unsigned long nr_pages,
278 void *data)
279 {
280 struct maar_walk_info *wi = data;
281 struct maar_config *cfg = &wi->cfg[wi->num_cfg];
282 unsigned int maar_align;
283
284
285 maar_align = BIT(MIPS_MAAR_ADDR_SHIFT + 4);
286
287
288 cfg->lower = ALIGN(PFN_PHYS(start_pfn), maar_align);
289 cfg->upper = ALIGN_DOWN(PFN_PHYS(start_pfn + nr_pages), maar_align) - 1;
290 cfg->attrs = MIPS_MAAR_S;
291
292
293 if (!WARN_ON(wi->num_cfg >= ARRAY_SIZE(wi->cfg)))
294 wi->num_cfg++;
295
296 return 0;
297 }
298
299
300 unsigned __weak platform_maar_init(unsigned num_pairs)
301 {
302 unsigned int num_configured;
303 struct maar_walk_info wi;
304
305 wi.num_cfg = 0;
306 walk_system_ram_range(0, max_pfn, &wi, maar_res_walk);
307
308 num_configured = maar_config(wi.cfg, wi.num_cfg, num_pairs);
309 if (num_configured < wi.num_cfg)
310 pr_warn("Not enough MAAR pairs (%u) for all memory regions (%u)\n",
311 num_pairs, wi.num_cfg);
312
313 return num_configured;
314 }
315
316 void maar_init(void)
317 {
318 unsigned num_maars, used, i;
319 phys_addr_t lower, upper, attr;
320 static struct {
321 struct maar_config cfgs[3];
322 unsigned used;
323 } recorded = { { { 0 } }, 0 };
324
325 if (!cpu_has_maar)
326 return;
327
328
329 write_c0_maari(~0);
330 back_to_back_c0_hazard();
331 num_maars = read_c0_maari() + 1;
332
333
334 WARN_ON(num_maars % 2);
335
336
337 if (recorded.used) {
338 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
339 BUG_ON(used != recorded.used);
340 } else {
341
342 used = platform_maar_init(num_maars / 2);
343 }
344
345
346 for (i = (used * 2); i < num_maars; i++) {
347 write_c0_maari(i);
348 back_to_back_c0_hazard();
349 write_c0_maar(0);
350 back_to_back_c0_hazard();
351 }
352
353 if (recorded.used)
354 return;
355
356 pr_info("MAAR configuration:\n");
357 for (i = 0; i < num_maars; i += 2) {
358 write_c0_maari(i);
359 back_to_back_c0_hazard();
360 upper = read_c0_maar();
361
362 write_c0_maari(i + 1);
363 back_to_back_c0_hazard();
364 lower = read_c0_maar();
365
366 attr = lower & upper;
367 lower = (lower & MIPS_MAAR_ADDR) << 4;
368 upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
369
370 pr_info(" [%d]: ", i / 2);
371 if (!(attr & MIPS_MAAR_VL)) {
372 pr_cont("disabled\n");
373 continue;
374 }
375
376 pr_cont("%pa-%pa", &lower, &upper);
377
378 if (attr & MIPS_MAAR_S)
379 pr_cont(" speculate");
380
381 pr_cont("\n");
382
383
384 if (used <= ARRAY_SIZE(recorded.cfgs)) {
385 recorded.cfgs[recorded.used].lower = lower;
386 recorded.cfgs[recorded.used].upper = upper;
387 recorded.cfgs[recorded.used].attrs = attr;
388 recorded.used++;
389 }
390 }
391 }
392
393 #ifndef CONFIG_NEED_MULTIPLE_NODES
394 void __init paging_init(void)
395 {
396 unsigned long max_zone_pfns[MAX_NR_ZONES];
397
398 pagetable_init();
399
400 #ifdef CONFIG_HIGHMEM
401 kmap_init();
402 #endif
403 #ifdef CONFIG_ZONE_DMA
404 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
405 #endif
406 #ifdef CONFIG_ZONE_DMA32
407 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
408 #endif
409 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
410 #ifdef CONFIG_HIGHMEM
411 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
412
413 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
414 printk(KERN_WARNING "This processor doesn't support highmem."
415 " %ldk highmem ignored\n",
416 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
417 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
418 }
419 #endif
420
421 free_area_init_nodes(max_zone_pfns);
422 }
423
424 #ifdef CONFIG_64BIT
425 static struct kcore_list kcore_kseg0;
426 #endif
427
428 static inline void __init mem_init_free_highmem(void)
429 {
430 #ifdef CONFIG_HIGHMEM
431 unsigned long tmp;
432
433 if (cpu_has_dc_aliases)
434 return;
435
436 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
437 struct page *page = pfn_to_page(tmp);
438
439 if (!memblock_is_memory(PFN_PHYS(tmp)))
440 SetPageReserved(page);
441 else
442 free_highmem_page(page);
443 }
444 #endif
445 }
446
447 void __init mem_init(void)
448 {
449
450
451
452
453 BUILD_BUG_ON(IS_ENABLED(CONFIG_32BIT) && (_PFN_SHIFT > PAGE_SHIFT));
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 memblock_free_all();
467 setup_zero_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
474
475 kclist_add(&kcore_kseg0, (void *) CKSEG0,
476 0x80000000 - 4, KCORE_TEXT);
477 #endif
478 }
479 #endif
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 void (*free_init_pages_eva)(void *begin, void *end) = NULL;
496
497 void __ref free_initmem(void)
498 {
499 prom_free_prom_memory();
500
501
502
503
504
505 if (free_init_pages_eva)
506 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
507 else
508 free_initmem_default(POISON_FREE_INITMEM);
509 }
510
511 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
512 unsigned long pgd_current[NR_CPUS];
513 #endif
514
515
516
517
518
519
520
521
522 pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
523 #ifndef __PAGETABLE_PUD_FOLDED
524 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
525 #endif
526 #ifndef __PAGETABLE_PMD_FOLDED
527 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
528 EXPORT_SYMBOL_GPL(invalid_pmd_table);
529 #endif
530 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
531 EXPORT_SYMBOL(invalid_pte_table);