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10#include <linux/kernel.h>
11#include <linux/errno.h>
12#include <linux/swap.h>
13#include <linux/init.h>
14#include <linux/bootmem.h>
15#include <linux/mman.h>
16#include <linux/export.h>
17#include <linux/nodemask.h>
18#include <linux/initrd.h>
19#include <linux/of_fdt.h>
20#include <linux/highmem.h>
21#include <linux/gfp.h>
22#include <linux/memblock.h>
23#include <linux/dma-contiguous.h>
24#include <linux/sizes.h>
25
26#include <asm/mach-types.h>
27#include <asm/memblock.h>
28#include <asm/prom.h>
29#include <asm/sections.h>
30#include <asm/setup.h>
31#include <asm/tlb.h>
32#include <asm/fixmap.h>
33
34#include <asm/mach/arch.h>
35#include <asm/mach/map.h>
36
37#include "mm.h"
38
39static phys_addr_t phys_initrd_start __initdata = 0;
40static unsigned long phys_initrd_size __initdata = 0;
41
42static int __init early_initrd(char *p)
43{
44 phys_addr_t start;
45 unsigned long size;
46 char *endp;
47
48 start = memparse(p, &endp);
49 if (*endp == ',') {
50 size = memparse(endp + 1, NULL);
51
52 phys_initrd_start = start;
53 phys_initrd_size = size;
54 }
55 return 0;
56}
57early_param("initrd", early_initrd);
58
59static int __init parse_tag_initrd(const struct tag *tag)
60{
61 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
62 "please update your bootloader.\n");
63 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
64 phys_initrd_size = tag->u.initrd.size;
65 return 0;
66}
67
68__tagtable(ATAG_INITRD, parse_tag_initrd);
69
70static int __init parse_tag_initrd2(const struct tag *tag)
71{
72 phys_initrd_start = tag->u.initrd.start;
73 phys_initrd_size = tag->u.initrd.size;
74 return 0;
75}
76
77__tagtable(ATAG_INITRD2, parse_tag_initrd2);
78
79#ifdef CONFIG_OF_FLATTREE
80void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
81{
82 phys_initrd_start = start;
83 phys_initrd_size = end - start;
84}
85#endif
86
87
88
89
90
91
92struct meminfo meminfo;
93
94void show_mem(unsigned int filter)
95{
96 int free = 0, total = 0, reserved = 0;
97 int shared = 0, cached = 0, slab = 0, i;
98 struct meminfo * mi = &meminfo;
99
100 printk("Mem-info:\n");
101 show_free_areas(filter);
102
103 if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
104 return;
105
106 for_each_bank (i, mi) {
107 struct membank *bank = &mi->bank[i];
108 unsigned int pfn1, pfn2;
109 struct page *page, *end;
110
111 pfn1 = bank_pfn_start(bank);
112 pfn2 = bank_pfn_end(bank);
113
114 page = pfn_to_page(pfn1);
115 end = pfn_to_page(pfn2 - 1) + 1;
116
117 do {
118 total++;
119 if (PageReserved(page))
120 reserved++;
121 else if (PageSwapCache(page))
122 cached++;
123 else if (PageSlab(page))
124 slab++;
125 else if (!page_count(page))
126 free++;
127 else
128 shared += page_count(page) - 1;
129 page++;
130 } while (page < end);
131 }
132
133 printk("%d pages of RAM\n", total);
134 printk("%d free pages\n", free);
135 printk("%d reserved pages\n", reserved);
136 printk("%d slab pages\n", slab);
137 printk("%d pages shared\n", shared);
138 printk("%d pages swap cached\n", cached);
139}
140
141static void __init find_limits(unsigned long *min, unsigned long *max_low,
142 unsigned long *max_high)
143{
144 struct meminfo *mi = &meminfo;
145 int i;
146
147
148 *min = bank_pfn_start(&mi->bank[0]);
149 for_each_bank (i, mi)
150 if (mi->bank[i].highmem)
151 break;
152 *max_low = bank_pfn_end(&mi->bank[i - 1]);
153 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
154}
155
156static void __init arm_bootmem_init(unsigned long start_pfn,
157 unsigned long end_pfn)
158{
159 struct memblock_region *reg;
160 unsigned int boot_pages;
161 phys_addr_t bitmap;
162 pg_data_t *pgdat;
163
164
165
166
167
168 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
169 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
170 __pfn_to_phys(end_pfn));
171
172
173
174
175
176 node_set_online(0);
177 pgdat = NODE_DATA(0);
178 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
179
180
181 for_each_memblock(memory, reg) {
182 unsigned long start = memblock_region_memory_base_pfn(reg);
183 unsigned long end = memblock_region_memory_end_pfn(reg);
184
185 if (end >= end_pfn)
186 end = end_pfn;
187 if (start >= end)
188 break;
189
190 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
191 }
192
193
194 for_each_memblock(reserved, reg) {
195 unsigned long start = memblock_region_reserved_base_pfn(reg);
196 unsigned long end = memblock_region_reserved_end_pfn(reg);
197
198 if (end >= end_pfn)
199 end = end_pfn;
200 if (start >= end)
201 break;
202
203 reserve_bootmem(__pfn_to_phys(start),
204 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
205 }
206}
207
208#ifdef CONFIG_ZONE_DMA
209
210phys_addr_t arm_dma_zone_size __read_mostly;
211EXPORT_SYMBOL(arm_dma_zone_size);
212
213
214
215
216
217
218
219phys_addr_t arm_dma_limit;
220
221static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
222 unsigned long dma_size)
223{
224 if (size[0] <= dma_size)
225 return;
226
227 size[ZONE_NORMAL] = size[0] - dma_size;
228 size[ZONE_DMA] = dma_size;
229 hole[ZONE_NORMAL] = hole[0];
230 hole[ZONE_DMA] = 0;
231}
232#endif
233
234void __init setup_dma_zone(const struct machine_desc *mdesc)
235{
236#ifdef CONFIG_ZONE_DMA
237 if (mdesc->dma_zone_size) {
238 arm_dma_zone_size = mdesc->dma_zone_size;
239 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
240 } else
241 arm_dma_limit = 0xffffffff;
242#endif
243}
244
245static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
246 unsigned long max_high)
247{
248 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
249 struct memblock_region *reg;
250
251
252
253
254 memset(zone_size, 0, sizeof(zone_size));
255
256
257
258
259
260
261 zone_size[0] = max_low - min;
262#ifdef CONFIG_HIGHMEM
263 zone_size[ZONE_HIGHMEM] = max_high - max_low;
264#endif
265
266
267
268
269
270 memcpy(zhole_size, zone_size, sizeof(zhole_size));
271 for_each_memblock(memory, reg) {
272 unsigned long start = memblock_region_memory_base_pfn(reg);
273 unsigned long end = memblock_region_memory_end_pfn(reg);
274
275 if (start < max_low) {
276 unsigned long low_end = min(end, max_low);
277 zhole_size[0] -= low_end - start;
278 }
279#ifdef CONFIG_HIGHMEM
280 if (end > max_low) {
281 unsigned long high_start = max(start, max_low);
282 zhole_size[ZONE_HIGHMEM] -= end - high_start;
283 }
284#endif
285 }
286
287#ifdef CONFIG_ZONE_DMA
288
289
290
291
292 if (arm_dma_zone_size)
293 arm_adjust_dma_zone(zone_size, zhole_size,
294 arm_dma_zone_size >> PAGE_SHIFT);
295#endif
296
297 free_area_init_node(0, zone_size, min, zhole_size);
298}
299
300#ifdef CONFIG_HAVE_ARCH_PFN_VALID
301int pfn_valid(unsigned long pfn)
302{
303 return memblock_is_memory(__pfn_to_phys(pfn));
304}
305EXPORT_SYMBOL(pfn_valid);
306#endif
307
308#ifndef CONFIG_SPARSEMEM
309static void __init arm_memory_present(void)
310{
311}
312#else
313static void __init arm_memory_present(void)
314{
315 struct memblock_region *reg;
316
317 for_each_memblock(memory, reg)
318 memory_present(0, memblock_region_memory_base_pfn(reg),
319 memblock_region_memory_end_pfn(reg));
320}
321#endif
322
323static bool arm_memblock_steal_permitted = true;
324
325phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
326{
327 phys_addr_t phys;
328
329 BUG_ON(!arm_memblock_steal_permitted);
330
331 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
332 memblock_free(phys, size);
333 memblock_remove(phys, size);
334
335 return phys;
336}
337
338void __init arm_memblock_init(struct meminfo *mi,
339 const struct machine_desc *mdesc)
340{
341 int i;
342
343 for (i = 0; i < mi->nr_banks; i++)
344 memblock_add(mi->bank[i].start, mi->bank[i].size);
345
346
347#ifdef CONFIG_XIP_KERNEL
348 memblock_reserve(__pa(_sdata), _end - _sdata);
349#else
350 memblock_reserve(__pa(_stext), _end - _stext);
351#endif
352#ifdef CONFIG_BLK_DEV_INITRD
353 if (phys_initrd_size &&
354 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
355 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
356 (u64)phys_initrd_start, phys_initrd_size);
357 phys_initrd_start = phys_initrd_size = 0;
358 }
359 if (phys_initrd_size &&
360 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
361 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
362 (u64)phys_initrd_start, phys_initrd_size);
363 phys_initrd_start = phys_initrd_size = 0;
364 }
365 if (phys_initrd_size) {
366 memblock_reserve(phys_initrd_start, phys_initrd_size);
367
368
369 initrd_start = __phys_to_virt(phys_initrd_start);
370 initrd_end = initrd_start + phys_initrd_size;
371 }
372#endif
373
374 arm_mm_memblock_reserve();
375 arm_dt_memblock_reserve();
376
377
378 if (mdesc->reserve)
379 mdesc->reserve();
380
381
382
383
384
385 dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
386
387 arm_memblock_steal_permitted = false;
388 memblock_allow_resize();
389 memblock_dump_all();
390}
391
392void __init bootmem_init(void)
393{
394 unsigned long min, max_low, max_high;
395
396 max_low = max_high = 0;
397
398 find_limits(&min, &max_low, &max_high);
399
400 arm_bootmem_init(min, max_low);
401
402
403
404
405
406 arm_memory_present();
407
408
409
410
411 sparse_init();
412
413
414
415
416
417
418 arm_bootmem_free(min, max_low, max_high);
419
420
421
422
423
424
425
426
427
428 max_low_pfn = max_low - PHYS_PFN_OFFSET;
429 max_pfn = max_high - PHYS_PFN_OFFSET;
430}
431
432
433
434
435
436static inline void poison_init_mem(void *s, size_t count)
437{
438 u32 *p = (u32 *)s;
439 for (; count != 0; count -= 4)
440 *p++ = 0xe7fddef0;
441}
442
443static inline void
444free_memmap(unsigned long start_pfn, unsigned long end_pfn)
445{
446 struct page *start_pg, *end_pg;
447 phys_addr_t pg, pgend;
448
449
450
451
452 start_pg = pfn_to_page(start_pfn - 1) + 1;
453 end_pg = pfn_to_page(end_pfn - 1) + 1;
454
455
456
457
458
459 pg = PAGE_ALIGN(__pa(start_pg));
460 pgend = __pa(end_pg) & PAGE_MASK;
461
462
463
464
465
466 if (pg < pgend)
467 free_bootmem(pg, pgend - pg);
468}
469
470
471
472
473static void __init free_unused_memmap(struct meminfo *mi)
474{
475 unsigned long bank_start, prev_bank_end = 0;
476 unsigned int i;
477
478
479
480
481
482 for_each_bank(i, mi) {
483 struct membank *bank = &mi->bank[i];
484
485 bank_start = bank_pfn_start(bank);
486
487#ifdef CONFIG_SPARSEMEM
488
489
490
491
492 bank_start = min(bank_start,
493 ALIGN(prev_bank_end, PAGES_PER_SECTION));
494#else
495
496
497
498
499
500 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
501#endif
502
503
504
505
506 if (prev_bank_end && prev_bank_end < bank_start)
507 free_memmap(prev_bank_end, bank_start);
508
509
510
511
512
513
514 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
515 }
516
517#ifdef CONFIG_SPARSEMEM
518 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
519 free_memmap(prev_bank_end,
520 ALIGN(prev_bank_end, PAGES_PER_SECTION));
521#endif
522}
523
524#ifdef CONFIG_HIGHMEM
525static inline void free_area_high(unsigned long pfn, unsigned long end)
526{
527 for (; pfn < end; pfn++)
528 free_highmem_page(pfn_to_page(pfn));
529}
530#endif
531
532static void __init free_highpages(void)
533{
534#ifdef CONFIG_HIGHMEM
535 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
536 struct memblock_region *mem, *res;
537
538
539 for_each_memblock(memory, mem) {
540 unsigned long start = memblock_region_memory_base_pfn(mem);
541 unsigned long end = memblock_region_memory_end_pfn(mem);
542
543
544 if (end <= max_low)
545 continue;
546
547
548 if (start < max_low)
549 start = max_low;
550
551
552 for_each_memblock(reserved, res) {
553 unsigned long res_start, res_end;
554
555 res_start = memblock_region_reserved_base_pfn(res);
556 res_end = memblock_region_reserved_end_pfn(res);
557
558 if (res_end < start)
559 continue;
560 if (res_start < start)
561 res_start = start;
562 if (res_start > end)
563 res_start = end;
564 if (res_end > end)
565 res_end = end;
566 if (res_start != start)
567 free_area_high(start, res_start);
568 start = res_end;
569 if (start == end)
570 break;
571 }
572
573
574 if (start < end)
575 free_area_high(start, end);
576 }
577#endif
578}
579
580
581
582
583
584
585void __init mem_init(void)
586{
587#ifdef CONFIG_HAVE_TCM
588
589 extern u32 dtcm_end;
590 extern u32 itcm_end;
591#endif
592
593 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
594
595
596 free_unused_memmap(&meminfo);
597 free_all_bootmem();
598
599#ifdef CONFIG_SA1111
600
601 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
602#endif
603
604 free_highpages();
605
606 mem_init_print_info(NULL);
607
608#define MLK(b, t) b, t, ((t) - (b)) >> 10
609#define MLM(b, t) b, t, ((t) - (b)) >> 20
610#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
611
612 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
613 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
614#ifdef CONFIG_HAVE_TCM
615 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
616 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
617#endif
618 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
619 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
620 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
621#ifdef CONFIG_HIGHMEM
622 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
623#endif
624#ifdef CONFIG_MODULES
625 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
626#endif
627 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
628 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
629 " .data : 0x%p" " - 0x%p" " (%4d kB)\n"
630 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n",
631
632 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
633 (PAGE_SIZE)),
634#ifdef CONFIG_HAVE_TCM
635 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
636 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
637#endif
638 MLK(FIXADDR_START, FIXADDR_TOP),
639 MLM(VMALLOC_START, VMALLOC_END),
640 MLM(PAGE_OFFSET, (unsigned long)high_memory),
641#ifdef CONFIG_HIGHMEM
642 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
643 (PAGE_SIZE)),
644#endif
645#ifdef CONFIG_MODULES
646 MLM(MODULES_VADDR, MODULES_END),
647#endif
648
649 MLK_ROUNDUP(_text, _etext),
650 MLK_ROUNDUP(__init_begin, __init_end),
651 MLK_ROUNDUP(_sdata, _edata),
652 MLK_ROUNDUP(__bss_start, __bss_stop));
653
654#undef MLK
655#undef MLM
656#undef MLK_ROUNDUP
657
658
659
660
661
662#ifdef CONFIG_MMU
663 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
664 BUG_ON(TASK_SIZE > MODULES_VADDR);
665#endif
666
667#ifdef CONFIG_HIGHMEM
668 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
669 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
670#endif
671
672 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
673 extern int sysctl_overcommit_memory;
674
675
676
677
678
679 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
680 }
681}
682
683void free_initmem(void)
684{
685#ifdef CONFIG_HAVE_TCM
686 extern char __tcm_start, __tcm_end;
687
688 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
689 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
690#endif
691
692 poison_init_mem(__init_begin, __init_end - __init_begin);
693 if (!machine_is_integrator() && !machine_is_cintegrator())
694 free_initmem_default(-1);
695}
696
697#ifdef CONFIG_BLK_DEV_INITRD
698
699static int keep_initrd;
700
701void free_initrd_mem(unsigned long start, unsigned long end)
702{
703 if (!keep_initrd) {
704 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
705 free_reserved_area((void *)start, (void *)end, -1, "initrd");
706 }
707}
708
709static int __init keepinitrd_setup(char *__unused)
710{
711 keep_initrd = 1;
712 return 1;
713}
714
715__setup("keepinitrd", keepinitrd_setup);
716#endif
717