summaryrefslogtreecommitdiff
path: root/arch/arm/mm/init.c
blob: a340569b991e111cd80a93632b918dc14fea2fa0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
/*
 *  linux/arch/arm/mm/init.c
 *
 *  Copyright (C) 1995-2005 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/sort.h>
#include <linux/highmem.h>

#include <asm/mach-types.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>

#include "mm.h"

static unsigned long phys_initrd_start __initdata = 0;
static unsigned long phys_initrd_size __initdata = 0;

static int __init early_initrd(char *p)
{
	unsigned long start, size;
	char *endp;

	start = memparse(p, &endp);
	if (*endp == ',') {
		size = memparse(endp + 1, NULL);

		phys_initrd_start = start;
		phys_initrd_size = size;
	}
	return 0;
}
early_param("initrd", early_initrd);

static int __init parse_tag_initrd(const struct tag *tag)
{
	printk(KERN_WARNING "ATAG_INITRD is deprecated; "
		"please update your bootloader.\n");
	phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
	phys_initrd_size = tag->u.initrd.size;
	return 0;
}

__tagtable(ATAG_INITRD, parse_tag_initrd);

static int __init parse_tag_initrd2(const struct tag *tag)
{
	phys_initrd_start = tag->u.initrd.start;
	phys_initrd_size = tag->u.initrd.size;
	return 0;
}

__tagtable(ATAG_INITRD2, parse_tag_initrd2);

/*
 * This keeps memory configuration data used by a couple memory
 * initialization functions, as well as show_mem() for the skipping
 * of holes in the memory map.  It is populated by arm_add_memory().
 */
struct meminfo meminfo;

void show_mem(void)
{
	int free = 0, total = 0, reserved = 0;
	int shared = 0, cached = 0, slab = 0, node, i;
	struct meminfo * mi = &meminfo;

	printk("Mem-info:\n");
	show_free_areas();
	for_each_online_node(node) {
		pg_data_t *n = NODE_DATA(node);
		struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;

		for_each_nodebank (i,mi,node) {
			struct membank *bank = &mi->bank[i];
			unsigned int pfn1, pfn2;
			struct page *page, *end;

			pfn1 = bank_pfn_start(bank);
			pfn2 = bank_pfn_end(bank);

			page = map + pfn1;
			end  = map + pfn2;

			do {
				total++;
				if (PageReserved(page))
					reserved++;
				else if (PageSwapCache(page))
					cached++;
				else if (PageSlab(page))
					slab++;
				else if (!page_count(page))
					free++;
				else
					shared += page_count(page) - 1;
				page++;
			} while (page < end);
		}
	}

	printk("%d pages of RAM\n", total);
	printk("%d free pages\n", free);
	printk("%d reserved pages\n", reserved);
	printk("%d slab pages\n", slab);
	printk("%d pages shared\n", shared);
	printk("%d pages swap cached\n", cached);
}

static void __init find_node_limits(int node, struct meminfo *mi,
	unsigned long *min, unsigned long *max_low, unsigned long *max_high)
{
	int i;

	*min = -1UL;
	*max_low = *max_high = 0;

	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		unsigned long start, end;

		start = bank_pfn_start(bank);
		end = bank_pfn_end(bank);

		if (*min > start)
			*min = start;
		if (*max_high < end)
			*max_high = end;
		if (bank->highmem)
			continue;
		if (*max_low < end)
			*max_low = end;
	}
}

/*
 * FIXME: We really want to avoid allocating the bootmap bitmap
 * over the top of the initrd.  Hopefully, this is located towards
 * the start of a bank, so if we allocate the bootmap bitmap at
 * the end, we won't clash.
 */
static unsigned int __init
find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
{
	unsigned int start_pfn, i, bootmap_pfn;

	start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
	bootmap_pfn = 0;

	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		unsigned int start, end;

		start = bank_pfn_start(bank);
		end   = bank_pfn_end(bank);

		if (end < start_pfn)
			continue;

		if (start < start_pfn)
			start = start_pfn;

		if (end <= start)
			continue;

		if (end - start >= bootmap_pages) {
			bootmap_pfn = start;
			break;
		}
	}

	if (bootmap_pfn == 0)
		BUG();

	return bootmap_pfn;
}

static int __init check_initrd(struct meminfo *mi)
{
	int initrd_node = -2;
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long end = phys_initrd_start + phys_initrd_size;

	/*
	 * Make sure that the initrd is within a valid area of
	 * memory.
	 */
	if (phys_initrd_size) {
		unsigned int i;

		initrd_node = -1;

		for (i = 0; i < mi->nr_banks; i++) {
			struct membank *bank = &mi->bank[i];
			if (bank_phys_start(bank) <= phys_initrd_start &&
			    end <= bank_phys_end(bank))
				initrd_node = bank->node;
		}
	}

	if (initrd_node == -1) {
		printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
		       "physical memory - disabling initrd\n",
		       phys_initrd_start, phys_initrd_size);
		phys_initrd_start = phys_initrd_size = 0;
	}
#endif

	return initrd_node;
}

static inline void map_memory_bank(struct membank *bank)
{
#ifdef CONFIG_MMU
	struct map_desc map;

	map.pfn = bank_pfn_start(bank);
	map.virtual = __phys_to_virt(bank_phys_start(bank));
	map.length = bank_phys_size(bank);
	map.type = MT_MEMORY;

	create_mapping(&map);
#endif
}

static void __init bootmem_init_node(int node, struct meminfo *mi,
	unsigned long start_pfn, unsigned long end_pfn)
{
	unsigned long boot_pfn;
	unsigned int boot_pages;
	pg_data_t *pgdat;
	int i;

	/*
	 * Map the memory banks for this node.
	 */
	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];

		if (!bank->highmem)
			map_memory_bank(bank);
	}

	/*
	 * Allocate the bootmem bitmap page.
	 */
	boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
	boot_pfn = find_bootmap_pfn(node, mi, boot_pages);

	/*
	 * Initialise the bootmem allocator for this node, handing the
	 * memory banks over to bootmem.
	 */
	node_set_online(node);
	pgdat = NODE_DATA(node);
	init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);

	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		if (!bank->highmem)
			free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
	}

	/*
	 * Reserve the bootmem bitmap for this node.
	 */
	reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
			     boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
}

static void __init bootmem_reserve_initrd(int node)
{
#ifdef CONFIG_BLK_DEV_INITRD
	pg_data_t *pgdat = NODE_DATA(node);
	int res;

	res = reserve_bootmem_node(pgdat, phys_initrd_start,
			     phys_initrd_size, BOOTMEM_EXCLUSIVE);

	if (res == 0) {
		initrd_start = __phys_to_virt(phys_initrd_start);
		initrd_end = initrd_start + phys_initrd_size;
	} else {
		printk(KERN_ERR
			"INITRD: 0x%08lx+0x%08lx overlaps in-use "
			"memory region - disabling initrd\n",
			phys_initrd_start, phys_initrd_size);
	}
#endif
}

static void __init bootmem_free_node(int node, struct meminfo *mi)
{
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	unsigned long min, max_low, max_high;
	int i;

	find_node_limits(node, mi, &min, &max_low, &max_high);

	/*
	 * initialise the zones within this node.
	 */
	memset(zone_size, 0, sizeof(zone_size));

	/*
	 * The size of this node has already been determined.  If we need
	 * to do anything fancy with the allocation of this memory to the
	 * zones, now is the time to do it.
	 */
	zone_size[0] = max_low - min;
#ifdef CONFIG_HIGHMEM
	zone_size[ZONE_HIGHMEM] = max_high - max_low;
#endif

	/*
	 * For each bank in this node, calculate the size of the holes.
	 *  holes = node_size - sum(bank_sizes_in_node)
	 */
	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	for_each_nodebank(i, mi, node) {
		int idx = 0;
#ifdef CONFIG_HIGHMEM
		if (mi->bank[i].highmem)
			idx = ZONE_HIGHMEM;
#endif
		zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
	}

	/*
	 * Adjust the sizes according to any special requirements for
	 * this machine type.
	 */
	arch_adjust_zones(node, zone_size, zhole_size);

	free_area_init_node(node, zone_size, min, zhole_size);
}

#ifndef CONFIG_SPARSEMEM
int pfn_valid(unsigned long pfn)
{
	struct meminfo *mi = &meminfo;
	unsigned int left = 0, right = mi->nr_banks;

	do {
		unsigned int mid = (right + left) / 2;
		struct membank *bank = &mi->bank[mid];

		if (pfn < bank_pfn_start(bank))
			right = mid;
		else if (pfn >= bank_pfn_end(bank))
			left = mid + 1;
		else
			return 1;
	} while (left < right);
	return 0;
}
EXPORT_SYMBOL(pfn_valid);

static void arm_memory_present(struct meminfo *mi, int node)
{
}
#else
static void arm_memory_present(struct meminfo *mi, int node)
{
	int i;
	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];
		memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
	}
}
#endif

static int __init meminfo_cmp(const void *_a, const void *_b)
{
	const struct membank *a = _a, *b = _b;
	long cmp = bank_pfn_start(a) - bank_pfn_start(b);
	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
}

void __init bootmem_init(void)
{
	struct meminfo *mi = &meminfo;
	unsigned long min, max_low, max_high;
	int node, initrd_node;

	sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL);

	/*
	 * Locate which node contains the ramdisk image, if any.
	 */
	initrd_node = check_initrd(mi);

	max_low = max_high = 0;

	/*
	 * Run through each node initialising the bootmem allocator.
	 */
	for_each_node(node) {
		unsigned long node_low, node_high;

		find_node_limits(node, mi, &min, &node_low, &node_high);

		if (node_low > max_low)
			max_low = node_low;
		if (node_high > max_high)
			max_high = node_high;

		/*
		 * If there is no memory in this node, ignore it.
		 * (We can't have nodes which have no lowmem)
		 */
		if (node_low == 0)
			continue;

		bootmem_init_node(node, mi, min, node_low);

		/*
		 * Reserve any special node zero regions.
		 */
		if (node == 0)
			reserve_node_zero(NODE_DATA(node));

		/*
		 * If the initrd is in this node, reserve its memory.
		 */
		if (node == initrd_node)
			bootmem_reserve_initrd(node);

		/*
		 * Sparsemem tries to allocate bootmem in memory_present(),
		 * so must be done after the fixed reservations
		 */
		arm_memory_present(mi, node);
	}

	/*
	 * sparse_init() needs the bootmem allocator up and running.
	 */
	sparse_init();

	/*
	 * Now free memory in each node - free_area_init_node needs
	 * the sparse mem_map arrays initialized by sparse_init()
	 * for memmap_init_zone(), otherwise all PFNs are invalid.
	 */
	for_each_node(node)
		bootmem_free_node(node, mi);

	high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;

	/*
	 * This doesn't seem to be used by the Linux memory manager any
	 * more, but is used by ll_rw_block.  If we can get rid of it, we
	 * also get rid of some of the stuff above as well.
	 *
	 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
	 * the system, not the maximum PFN.
	 */
	max_low_pfn = max_low - PHYS_PFN_OFFSET;
	max_pfn = max_high - PHYS_PFN_OFFSET;
}

static inline int free_area(unsigned long pfn, unsigned long end, char *s)
{
	unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);

	for (; pfn < end; pfn++) {
		struct page *page = pfn_to_page(pfn);
		ClearPageReserved(page);
		init_page_count(page);
		__free_page(page);
		pages++;
	}

	if (size && s)
		printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);

	return pages;
}

static inline void
free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
{
	struct page *start_pg, *end_pg;
	unsigned long pg, pgend;

	/*
	 * Convert start_pfn/end_pfn to a struct page pointer.
	 */
	start_pg = pfn_to_page(start_pfn - 1) + 1;
	end_pg = pfn_to_page(end_pfn);

	/*
	 * Convert to physical addresses, and
	 * round start upwards and end downwards.
	 */
	pg = PAGE_ALIGN(__pa(start_pg));
	pgend = __pa(end_pg) & PAGE_MASK;

	/*
	 * If there are free pages between these,
	 * free the section of the memmap array.
	 */
	if (pg < pgend)
		free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
}

/*
 * The mem_map array can get very big.  Free the unused area of the memory map.
 */
static void __init free_unused_memmap_node(int node, struct meminfo *mi)
{
	unsigned long bank_start, prev_bank_end = 0;
	unsigned int i;

	/*
	 * [FIXME] This relies on each bank being in address order.  This
	 * may not be the case, especially if the user has provided the
	 * information on the command line.
	 */
	for_each_nodebank(i, mi, node) {
		struct membank *bank = &mi->bank[i];

		bank_start = bank_pfn_start(bank);
		if (bank_start < prev_bank_end) {
			printk(KERN_ERR "MEM: unordered memory banks.  "
				"Not freeing memmap.\n");
			break;
		}

		/*
		 * If we had a previous bank, and there is a space
		 * between the current bank and the previous, free it.
		 */
		if (prev_bank_end && prev_bank_end != bank_start)
			free_memmap(node, prev_bank_end, bank_start);

		prev_bank_end = bank_pfn_end(bank);
	}
}

/*
 * mem_init() marks the free areas in the mem_map and tells us how much
 * memory is free.  This is done after various parts of the system have
 * claimed their memory after the kernel image.
 */
void __init mem_init(void)
{
	unsigned int codesize, datasize, initsize;
	int i, node;

#ifndef CONFIG_DISCONTIGMEM
	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
#endif

	/* this will put all unused low memory onto the freelists */
	for_each_online_node(node) {
		pg_data_t *pgdat = NODE_DATA(node);

		free_unused_memmap_node(node, &meminfo);

		if (pgdat->node_spanned_pages != 0)
			totalram_pages += free_all_bootmem_node(pgdat);
	}

#ifdef CONFIG_SA1111
	/* now that our DMA memory is actually so designated, we can free it */
	totalram_pages += free_area(PHYS_PFN_OFFSET,
				    __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
#endif

#ifdef CONFIG_HIGHMEM
	/* set highmem page free */
	for_each_online_node(node) {
		for_each_nodebank (i, &meminfo, node) {
			unsigned long start = bank_pfn_start(&meminfo.bank[i]);
			unsigned long end = bank_pfn_end(&meminfo.bank[i]);
			if (start >= max_low_pfn + PHYS_PFN_OFFSET)
				totalhigh_pages += free_area(start, end, NULL);
		}
	}
	totalram_pages += totalhigh_pages;
#endif

	/*
	 * Since our memory may not be contiguous, calculate the
	 * real number of pages we have in this system
	 */
	printk(KERN_INFO "Memory:");
	num_physpages = 0;
	for (i = 0; i < meminfo.nr_banks; i++) {
		num_physpages += bank_pfn_size(&meminfo.bank[i]);
		printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
	}
	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));

	codesize = _etext - _text;
	datasize = _end - _data;
	initsize = __init_end - __init_begin;

	printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
		"%dK data, %dK init, %luK highmem)\n",
		nr_free_pages() << (PAGE_SHIFT-10), codesize >> 10,
		datasize >> 10, initsize >> 10,
		totalhigh_pages << (PAGE_SHIFT-10));

	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
		extern int sysctl_overcommit_memory;
		/*
		 * On a machine this small we won't get
		 * anywhere without overcommit, so turn
		 * it on by default.
		 */
		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	}
}

void free_initmem(void)
{
#ifdef CONFIG_HAVE_TCM
	extern char *__tcm_start, *__tcm_end;

	totalram_pages += free_area(__phys_to_pfn(__pa(__tcm_start)),
				    __phys_to_pfn(__pa(__tcm_end)),
				    "TCM link");
#endif

	if (!machine_is_integrator() && !machine_is_cintegrator())
		totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
					    __phys_to_pfn(__pa(__init_end)),
					    "init");
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd)
		totalram_pages += free_area(__phys_to_pfn(__pa(start)),
					    __phys_to_pfn(__pa(end)),
					    "initrd");
}

static int __init keepinitrd_setup(char *__unused)
{
	keep_initrd = 1;
	return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif