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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/arch/arm/mm/init.c
3 *
Russell King90072052005-10-28 14:48:37 +01004 * Copyright (C) 1995-2005 Russell King
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/kernel.h>
11#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/swap.h>
13#include <linux/init.h>
14#include <linux/bootmem.h>
15#include <linux/mman.h>
16#include <linux/nodemask.h>
17#include <linux/initrd.h>
Russell Kingb7cfda92009-09-07 15:06:42 +010018#include <linux/sort.h>
Nicolas Pitre3835f6c2008-09-17 15:21:55 -040019#include <linux/highmem.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21#include <asm/mach-types.h>
Russell King37efe642008-12-01 11:53:07 +000022#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <asm/setup.h>
Russell King74d02fb2006-04-04 21:47:43 +010024#include <asm/sizes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <asm/tlb.h>
26
27#include <asm/mach/arch.h>
28#include <asm/mach/map.h>
29
Russell King1b2e2b72006-08-21 17:06:38 +010030#include "mm.h"
31
Russell King012d1f42008-09-06 10:57:03 +010032static unsigned long phys_initrd_start __initdata = 0;
33static unsigned long phys_initrd_size __initdata = 0;
34
35static void __init early_initrd(char **p)
36{
37 unsigned long start, size;
38
39 start = memparse(*p, p);
40 if (**p == ',') {
41 size = memparse((*p) + 1, p);
42
43 phys_initrd_start = start;
44 phys_initrd_size = size;
45 }
46}
47__early_param("initrd=", early_initrd);
48
49static int __init parse_tag_initrd(const struct tag *tag)
50{
51 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
52 "please update your bootloader.\n");
53 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
54 phys_initrd_size = tag->u.initrd.size;
55 return 0;
56}
57
58__tagtable(ATAG_INITRD, parse_tag_initrd);
59
60static int __init parse_tag_initrd2(const struct tag *tag)
61{
62 phys_initrd_start = tag->u.initrd.start;
63 phys_initrd_size = tag->u.initrd.size;
64 return 0;
65}
66
67__tagtable(ATAG_INITRD2, parse_tag_initrd2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69/*
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040070 * This keeps memory configuration data used by a couple memory
71 * initialization functions, as well as show_mem() for the skipping
72 * of holes in the memory map. It is populated by arm_add_memory().
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 */
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040074struct meminfo meminfo;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076void show_mem(void)
77{
78 int free = 0, total = 0, reserved = 0;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010079 int shared = 0, cached = 0, slab = 0, node, i;
80 struct meminfo * mi = &meminfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 printk("Mem-info:\n");
83 show_free_areas();
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 for_each_online_node(node) {
Russell King204ecae2007-01-16 14:01:47 +000085 pg_data_t *n = NODE_DATA(node);
Russell Kingb7a69ac2008-10-01 16:58:32 +010086 struct page *map = pgdat_page_nr(n, 0) - n->node_start_pfn;
Russell King204ecae2007-01-16 14:01:47 +000087
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010088 for_each_nodebank (i,mi,node) {
Russell Kingd2a38ef2008-10-01 16:56:15 +010089 struct membank *bank = &mi->bank[i];
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010090 unsigned int pfn1, pfn2;
91 struct page *page, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Russell Kingd2a38ef2008-10-01 16:56:15 +010093 pfn1 = bank_pfn_start(bank);
94 pfn2 = bank_pfn_end(bank);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Russell King204ecae2007-01-16 14:01:47 +000096 page = map + pfn1;
97 end = map + pfn2;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010098
99 do {
100 total++;
101 if (PageReserved(page))
102 reserved++;
103 else if (PageSwapCache(page))
104 cached++;
105 else if (PageSlab(page))
106 slab++;
107 else if (!page_count(page))
108 free++;
109 else
110 shared += page_count(page) - 1;
111 page++;
112 } while (page < end);
113 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 }
115
116 printk("%d pages of RAM\n", total);
117 printk("%d free pages\n", free);
118 printk("%d reserved pages\n", reserved);
119 printk("%d slab pages\n", slab);
120 printk("%d pages shared\n", shared);
121 printk("%d pages swap cached\n", cached);
122}
123
Russell Kingdde58282009-08-15 12:36:00 +0100124static void __init find_node_limits(int node, struct meminfo *mi,
125 unsigned long *min, unsigned long *max_low, unsigned long *max_high)
126{
127 int i;
128
129 *min = -1UL;
130 *max_low = *max_high = 0;
131
132 for_each_nodebank(i, mi, node) {
133 struct membank *bank = &mi->bank[i];
134 unsigned long start, end;
135
136 start = bank_pfn_start(bank);
137 end = bank_pfn_end(bank);
138
139 if (*min > start)
140 *min = start;
141 if (*max_high < end)
142 *max_high = end;
143 if (bank->highmem)
144 continue;
145 if (*max_low < end)
146 *max_low = end;
147 }
148}
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150/*
151 * FIXME: We really want to avoid allocating the bootmap bitmap
152 * over the top of the initrd. Hopefully, this is located towards
153 * the start of a bank, so if we allocate the bootmap bitmap at
154 * the end, we won't clash.
155 */
156static unsigned int __init
157find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
158{
Russell Kingd2a38ef2008-10-01 16:56:15 +0100159 unsigned int start_pfn, i, bootmap_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Russell King37efe642008-12-01 11:53:07 +0000161 start_pfn = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 bootmap_pfn = 0;
163
Russell Kingd2a38ef2008-10-01 16:56:15 +0100164 for_each_nodebank(i, mi, node) {
165 struct membank *bank = &mi->bank[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 unsigned int start, end;
167
Russell Kingd2a38ef2008-10-01 16:56:15 +0100168 start = bank_pfn_start(bank);
169 end = bank_pfn_end(bank);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 if (end < start_pfn)
172 continue;
173
174 if (start < start_pfn)
175 start = start_pfn;
176
177 if (end <= start)
178 continue;
179
180 if (end - start >= bootmap_pages) {
181 bootmap_pfn = start;
182 break;
183 }
184 }
185
186 if (bootmap_pfn == 0)
187 BUG();
188
189 return bootmap_pfn;
190}
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192static int __init check_initrd(struct meminfo *mi)
193{
194 int initrd_node = -2;
195#ifdef CONFIG_BLK_DEV_INITRD
196 unsigned long end = phys_initrd_start + phys_initrd_size;
197
198 /*
199 * Make sure that the initrd is within a valid area of
200 * memory.
201 */
202 if (phys_initrd_size) {
203 unsigned int i;
204
205 initrd_node = -1;
206
207 for (i = 0; i < mi->nr_banks; i++) {
Russell Kingd2a38ef2008-10-01 16:56:15 +0100208 struct membank *bank = &mi->bank[i];
209 if (bank_phys_start(bank) <= phys_initrd_start &&
210 end <= bank_phys_end(bank))
211 initrd_node = bank->node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213 }
214
215 if (initrd_node == -1) {
Russell Kingb962a282008-07-30 21:24:56 +0100216 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 "physical memory - disabling initrd\n",
Russell Kingb962a282008-07-30 21:24:56 +0100218 phys_initrd_start, phys_initrd_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 phys_initrd_start = phys_initrd_size = 0;
220 }
221#endif
222
223 return initrd_node;
224}
225
Russell King456335e2006-09-27 10:00:54 +0100226static inline void map_memory_bank(struct membank *bank)
227{
Russell Kingd111e8f2006-09-27 15:27:33 +0100228#ifdef CONFIG_MMU
Russell King456335e2006-09-27 10:00:54 +0100229 struct map_desc map;
230
Russell Kingd2a38ef2008-10-01 16:56:15 +0100231 map.pfn = bank_pfn_start(bank);
232 map.virtual = __phys_to_virt(bank_phys_start(bank));
233 map.length = bank_phys_size(bank);
Russell King456335e2006-09-27 10:00:54 +0100234 map.type = MT_MEMORY;
235
236 create_mapping(&map);
Russell Kingd111e8f2006-09-27 15:27:33 +0100237#endif
Russell King456335e2006-09-27 10:00:54 +0100238}
239
Russell Kingdde58282009-08-15 12:36:00 +0100240static void __init bootmem_init_node(int node, struct meminfo *mi,
241 unsigned long start_pfn, unsigned long end_pfn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
Russell Kingdde58282009-08-15 12:36:00 +0100243 unsigned long boot_pfn;
Russell King90072052005-10-28 14:48:37 +0100244 unsigned int boot_pages;
245 pg_data_t *pgdat;
246 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 /*
Russell Kingdde58282009-08-15 12:36:00 +0100249 * Map the memory banks for this node.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 */
Russell King90072052005-10-28 14:48:37 +0100251 for_each_nodebank(i, mi, node) {
Russell King456335e2006-09-27 10:00:54 +0100252 struct membank *bank = &mi->bank[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Russell Kingdde58282009-08-15 12:36:00 +0100254 if (!bank->highmem)
255 map_memory_bank(bank);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
257
Russell King90072052005-10-28 14:48:37 +0100258 /*
Russell King90072052005-10-28 14:48:37 +0100259 * Allocate the bootmem bitmap page.
260 */
261 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
262 boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
263
264 /*
265 * Initialise the bootmem allocator for this node, handing the
266 * memory banks over to bootmem.
267 */
268 node_set_online(node);
269 pgdat = NODE_DATA(node);
270 init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
271
Russell Kingd2a38ef2008-10-01 16:56:15 +0100272 for_each_nodebank(i, mi, node) {
273 struct membank *bank = &mi->bank[i];
Russell Kingdde58282009-08-15 12:36:00 +0100274 if (!bank->highmem)
275 free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
Russell Kingb7a69ac2008-10-01 16:58:32 +0100276 memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
Russell Kingd2a38ef2008-10-01 16:56:15 +0100277 }
Russell King90072052005-10-28 14:48:37 +0100278
279 /*
280 * Reserve the bootmem bitmap for this node.
281 */
282 reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800283 boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
Russell Kingb7a69ac2008-10-01 16:58:32 +0100284}
Russell Kingb962a282008-07-30 21:24:56 +0100285
Russell Kingb7a69ac2008-10-01 16:58:32 +0100286static void __init bootmem_reserve_initrd(int node)
287{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288#ifdef CONFIG_BLK_DEV_INITRD
Russell Kingb7a69ac2008-10-01 16:58:32 +0100289 pg_data_t *pgdat = NODE_DATA(node);
290 int res;
Russell Kingb962a282008-07-30 21:24:56 +0100291
Russell Kingb7a69ac2008-10-01 16:58:32 +0100292 res = reserve_bootmem_node(pgdat, phys_initrd_start,
293 phys_initrd_size, BOOTMEM_EXCLUSIVE);
294
295 if (res == 0) {
296 initrd_start = __phys_to_virt(phys_initrd_start);
297 initrd_end = initrd_start + phys_initrd_size;
298 } else {
299 printk(KERN_ERR
300 "INITRD: 0x%08lx+0x%08lx overlaps in-use "
301 "memory region - disabling initrd\n",
302 phys_initrd_start, phys_initrd_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 }
304#endif
Russell Kingb7a69ac2008-10-01 16:58:32 +0100305}
306
307static void __init bootmem_free_node(int node, struct meminfo *mi)
308{
309 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Russell Kingdde58282009-08-15 12:36:00 +0100310 unsigned long min, max_low, max_high;
Russell Kingb7a69ac2008-10-01 16:58:32 +0100311 int i;
312
Russell Kingdde58282009-08-15 12:36:00 +0100313 find_node_limits(node, mi, &min, &max_low, &max_high);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Russell King90072052005-10-28 14:48:37 +0100315 /*
Russell King90072052005-10-28 14:48:37 +0100316 * initialise the zones within this node.
317 */
318 memset(zone_size, 0, sizeof(zone_size));
Russell King90072052005-10-28 14:48:37 +0100319
320 /*
321 * The size of this node has already been determined. If we need
322 * to do anything fancy with the allocation of this memory to the
323 * zones, now is the time to do it.
324 */
Russell Kingdde58282009-08-15 12:36:00 +0100325 zone_size[0] = max_low - min;
326#ifdef CONFIG_HIGHMEM
327 zone_size[ZONE_HIGHMEM] = max_high - max_low;
328#endif
Russell King90072052005-10-28 14:48:37 +0100329
330 /*
331 * For each bank in this node, calculate the size of the holes.
332 * holes = node_size - sum(bank_sizes_in_node)
333 */
Russell Kingdde58282009-08-15 12:36:00 +0100334 memcpy(zhole_size, zone_size, sizeof(zhole_size));
335 for_each_nodebank(i, mi, node) {
336 int idx = 0;
337#ifdef CONFIG_HIGHMEM
338 if (mi->bank[i].highmem)
339 idx = ZONE_HIGHMEM;
340#endif
341 zhole_size[idx] -= bank_pfn_size(&mi->bank[i]);
342 }
Russell King90072052005-10-28 14:48:37 +0100343
344 /*
345 * Adjust the sizes according to any special requirements for
346 * this machine type.
347 */
348 arch_adjust_zones(node, zone_size, zhole_size);
349
Russell Kingdde58282009-08-15 12:36:00 +0100350 free_area_init_node(node, zone_size, min, zhole_size);
Russell King90072052005-10-28 14:48:37 +0100351}
352
Russell Kingb7cfda92009-09-07 15:06:42 +0100353#ifndef CONFIG_SPARSEMEM
354int pfn_valid(unsigned long pfn)
355{
356 struct meminfo *mi = &meminfo;
357 unsigned int left = 0, right = mi->nr_banks;
358
359 do {
360 unsigned int mid = (right + left) / 2;
361 struct membank *bank = &mi->bank[mid];
362
363 if (pfn < bank_pfn_start(bank))
364 right = mid;
365 else if (pfn >= bank_pfn_end(bank))
366 left = mid + 1;
367 else
368 return 1;
369 } while (left < right);
370 return 0;
371}
372EXPORT_SYMBOL(pfn_valid);
373#endif
374
375static int __init meminfo_cmp(const void *_a, const void *_b)
376{
377 const struct membank *a = _a, *b = _b;
378 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
379 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
380}
381
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400382void __init bootmem_init(void)
Russell King90072052005-10-28 14:48:37 +0100383{
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -0400384 struct meminfo *mi = &meminfo;
Russell Kingdde58282009-08-15 12:36:00 +0100385 unsigned long min, max_low, max_high;
Russell Kingeca73212008-09-30 19:29:25 +0100386 int node, initrd_node;
Russell King90072052005-10-28 14:48:37 +0100387
Russell Kingb7cfda92009-09-07 15:06:42 +0100388 sort(&mi->bank, mi->nr_banks, sizeof(mi->bank[0]), meminfo_cmp, NULL);
389
Russell King90072052005-10-28 14:48:37 +0100390 /*
391 * Locate which node contains the ramdisk image, if any.
392 */
393 initrd_node = check_initrd(mi);
394
Russell Kingdde58282009-08-15 12:36:00 +0100395 max_low = max_high = 0;
396
Russell King90072052005-10-28 14:48:37 +0100397 /*
398 * Run through each node initialising the bootmem allocator.
399 */
400 for_each_node(node) {
Russell Kingdde58282009-08-15 12:36:00 +0100401 unsigned long node_low, node_high;
402
403 find_node_limits(node, mi, &min, &node_low, &node_high);
404
405 if (node_low > max_low)
406 max_low = node_low;
407 if (node_high > max_high)
408 max_high = node_high;
409
410 /*
411 * If there is no memory in this node, ignore it.
412 * (We can't have nodes which have no lowmem)
413 */
414 if (node_low == 0)
415 continue;
416
417 bootmem_init_node(node, mi, min, node_low);
Russell King90072052005-10-28 14:48:37 +0100418
Russell Kingb7a69ac2008-10-01 16:58:32 +0100419 /*
420 * Reserve any special node zero regions.
421 */
422 if (node == 0)
423 reserve_node_zero(NODE_DATA(node));
424
425 /*
426 * If the initrd is in this node, reserve its memory.
427 */
428 if (node == initrd_node)
429 bootmem_reserve_initrd(node);
Russell King90072052005-10-28 14:48:37 +0100430 }
431
Russell Kingb7a69ac2008-10-01 16:58:32 +0100432 /*
433 * sparse_init() needs the bootmem allocator up and running.
434 */
435 sparse_init();
436
437 /*
438 * Now free memory in each node - free_area_init_node needs
439 * the sparse mem_map arrays initialized by sparse_init()
440 * for memmap_init_zone(), otherwise all PFNs are invalid.
441 */
442 for_each_node(node)
443 bootmem_free_node(node, mi);
444
Russell Kingdde58282009-08-15 12:36:00 +0100445 high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
Russell King90072052005-10-28 14:48:37 +0100446
447 /*
448 * This doesn't seem to be used by the Linux memory manager any
449 * more, but is used by ll_rw_block. If we can get rid of it, we
450 * also get rid of some of the stuff above as well.
451 *
452 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
453 * the system, not the maximum PFN.
454 */
Russell Kingdde58282009-08-15 12:36:00 +0100455 max_low_pfn = max_low - PHYS_PFN_OFFSET;
456 max_pfn = max_high - PHYS_PFN_OFFSET;
Russell King90072052005-10-28 14:48:37 +0100457}
458
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400459static inline int free_area(unsigned long pfn, unsigned long end, char *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400461 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400463 for (; pfn < end; pfn++) {
464 struct page *page = pfn_to_page(pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800466 init_page_count(page);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400467 __free_page(page);
468 pages++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
470
471 if (size && s)
472 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400473
474 return pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475}
476
Russell Kinga0130532005-06-27 14:16:47 +0100477static inline void
478free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
479{
480 struct page *start_pg, *end_pg;
481 unsigned long pg, pgend;
482
483 /*
484 * Convert start_pfn/end_pfn to a struct page pointer.
485 */
486 start_pg = pfn_to_page(start_pfn);
487 end_pg = pfn_to_page(end_pfn);
488
489 /*
490 * Convert to physical addresses, and
491 * round start upwards and end downwards.
492 */
493 pg = PAGE_ALIGN(__pa(start_pg));
494 pgend = __pa(end_pg) & PAGE_MASK;
495
496 /*
497 * If there are free pages between these,
498 * free the section of the memmap array.
499 */
500 if (pg < pgend)
501 free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
502}
503
504/*
505 * The mem_map array can get very big. Free the unused area of the memory map.
506 */
507static void __init free_unused_memmap_node(int node, struct meminfo *mi)
508{
509 unsigned long bank_start, prev_bank_end = 0;
510 unsigned int i;
511
512 /*
513 * [FIXME] This relies on each bank being in address order. This
514 * may not be the case, especially if the user has provided the
515 * information on the command line.
516 */
Russell King90072052005-10-28 14:48:37 +0100517 for_each_nodebank(i, mi, node) {
Russell Kingd2a38ef2008-10-01 16:56:15 +0100518 struct membank *bank = &mi->bank[i];
519
520 bank_start = bank_pfn_start(bank);
Russell Kinga0130532005-06-27 14:16:47 +0100521 if (bank_start < prev_bank_end) {
522 printk(KERN_ERR "MEM: unordered memory banks. "
523 "Not freeing memmap.\n");
524 break;
525 }
526
527 /*
528 * If we had a previous bank, and there is a space
529 * between the current bank and the previous, free it.
530 */
531 if (prev_bank_end && prev_bank_end != bank_start)
532 free_memmap(node, prev_bank_end, bank_start);
533
Russell Kingd2a38ef2008-10-01 16:56:15 +0100534 prev_bank_end = bank_pfn_end(bank);
Russell Kinga0130532005-06-27 14:16:47 +0100535 }
536}
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538/*
539 * mem_init() marks the free areas in the mem_map and tells us how much
540 * memory is free. This is done after various parts of the system have
541 * claimed their memory after the kernel image.
542 */
543void __init mem_init(void)
544{
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400545 unsigned int codesize, datasize, initsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 int i, node;
547
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548#ifndef CONFIG_DISCONTIGMEM
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400549 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550#endif
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 /* this will put all unused low memory onto the freelists */
553 for_each_online_node(node) {
554 pg_data_t *pgdat = NODE_DATA(node);
555
Russell Kinga0130532005-06-27 14:16:47 +0100556 free_unused_memmap_node(node, &meminfo);
557
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 if (pgdat->node_spanned_pages != 0)
559 totalram_pages += free_all_bootmem_node(pgdat);
560 }
561
562#ifdef CONFIG_SA1111
563 /* now that our DMA memory is actually so designated, we can free it */
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400564 totalram_pages += free_area(PHYS_PFN_OFFSET,
565 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566#endif
567
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400568#ifdef CONFIG_HIGHMEM
569 /* set highmem page free */
570 for_each_online_node(node) {
571 for_each_nodebank (i, &meminfo, node) {
572 unsigned long start = bank_pfn_start(&meminfo.bank[i]);
573 unsigned long end = bank_pfn_end(&meminfo.bank[i]);
574 if (start >= max_low_pfn + PHYS_PFN_OFFSET)
575 totalhigh_pages += free_area(start, end, NULL);
576 }
577 }
578 totalram_pages += totalhigh_pages;
579#endif
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 /*
582 * Since our memory may not be contiguous, calculate the
583 * real number of pages we have in this system
584 */
585 printk(KERN_INFO "Memory:");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 num_physpages = 0;
587 for (i = 0; i < meminfo.nr_banks; i++) {
Russell Kingd2a38ef2008-10-01 16:56:15 +0100588 num_physpages += bank_pfn_size(&meminfo.bank[i]);
589 printk(" %ldMB", bank_phys_size(&meminfo.bank[i]) >> 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400592
Russell King37efe642008-12-01 11:53:07 +0000593 codesize = _etext - _text;
594 datasize = _end - _data;
595 initsize = __init_end - __init_begin;
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400598 "%dK data, %dK init, %luK highmem)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400600 codesize >> 10, datasize >> 10, initsize >> 10,
601 (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602
603 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
604 extern int sysctl_overcommit_memory;
605 /*
606 * On a machine this small we won't get
607 * anywhere without overcommit, so turn
608 * it on by default.
609 */
610 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
611 }
612}
613
614void free_initmem(void)
615{
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400616 if (!machine_is_integrator() && !machine_is_cintegrator())
Russell King37efe642008-12-01 11:53:07 +0000617 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
618 __phys_to_pfn(__pa(__init_end)),
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400619 "init");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
622#ifdef CONFIG_BLK_DEV_INITRD
623
624static int keep_initrd;
625
626void free_initrd_mem(unsigned long start, unsigned long end)
627{
628 if (!keep_initrd)
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400629 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
630 __phys_to_pfn(__pa(end)),
631 "initrd");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632}
633
634static int __init keepinitrd_setup(char *__unused)
635{
636 keep_initrd = 1;
637 return 1;
638}
639
640__setup("keepinitrd", keepinitrd_setup);
641#endif