blob: 5739a34bc9b1b627f12a23803f1b26145f3b11f3 [file] [log] [blame]
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>
Grant Likely9eb8f672011-04-28 14:27:20 -060018#include <linux/of_fdt.h>
Nicolas Pitre3835f6c2008-09-17 15:21:55 -040019#include <linux/highmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/gfp.h>
Russell King2778f622010-07-09 16:27:52 +010021#include <linux/memblock.h>
Russell King7dc50ec2010-10-27 18:14:56 +010022#include <linux/sort.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <asm/mach-types.h>
Grant Likely93c02ab2011-04-28 14:27:21 -060025#include <asm/prom.h>
Russell King37efe642008-12-01 11:53:07 +000026#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <asm/setup.h>
Russell King74d02fb2006-04-04 21:47:43 +010028#include <asm/sizes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <asm/tlb.h>
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +010030#include <asm/fixmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include <asm/mach/arch.h>
33#include <asm/mach/map.h>
34
Russell King1b2e2b72006-08-21 17:06:38 +010035#include "mm.h"
36
Russell King012d1f42008-09-06 10:57:03 +010037static unsigned long phys_initrd_start __initdata = 0;
38static unsigned long phys_initrd_size __initdata = 0;
39
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010040static int __init early_initrd(char *p)
Russell King012d1f42008-09-06 10:57:03 +010041{
42 unsigned long start, size;
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010043 char *endp;
Russell King012d1f42008-09-06 10:57:03 +010044
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010045 start = memparse(p, &endp);
46 if (*endp == ',') {
47 size = memparse(endp + 1, NULL);
Russell King012d1f42008-09-06 10:57:03 +010048
49 phys_initrd_start = start;
50 phys_initrd_size = size;
51 }
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010052 return 0;
Russell King012d1f42008-09-06 10:57:03 +010053}
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010054early_param("initrd", early_initrd);
Russell King012d1f42008-09-06 10:57:03 +010055
56static int __init parse_tag_initrd(const struct tag *tag)
57{
58 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
59 "please update your bootloader.\n");
60 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
61 phys_initrd_size = tag->u.initrd.size;
62 return 0;
63}
64
65__tagtable(ATAG_INITRD, parse_tag_initrd);
66
67static int __init parse_tag_initrd2(const struct tag *tag)
68{
69 phys_initrd_start = tag->u.initrd.start;
70 phys_initrd_size = tag->u.initrd.size;
71 return 0;
72}
73
74__tagtable(ATAG_INITRD2, parse_tag_initrd2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Grant Likely9eb8f672011-04-28 14:27:20 -060076#ifdef CONFIG_OF_FLATTREE
77void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
78{
79 phys_initrd_start = start;
80 phys_initrd_size = end - start;
81}
82#endif /* CONFIG_OF_FLATTREE */
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/*
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040085 * This keeps memory configuration data used by a couple memory
86 * initialization functions, as well as show_mem() for the skipping
87 * of holes in the memory map. It is populated by arm_add_memory().
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 */
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040089struct meminfo meminfo;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010090
David Rientjesb2b755b2011-03-24 15:18:15 -070091void show_mem(unsigned int filter)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 int free = 0, total = 0, reserved = 0;
Russell Kingbe370302010-05-07 17:40:33 +010094 int shared = 0, cached = 0, slab = 0, i;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010095 struct meminfo * mi = &meminfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
97 printk("Mem-info:\n");
David Rientjes7bf02ea2011-05-24 17:11:16 -070098 show_free_areas(filter);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Russell Kingbe370302010-05-07 17:40:33 +0100100 for_each_bank (i, mi) {
101 struct membank *bank = &mi->bank[i];
102 unsigned int pfn1, pfn2;
103 struct page *page, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Russell Kingbe370302010-05-07 17:40:33 +0100105 pfn1 = bank_pfn_start(bank);
106 pfn2 = bank_pfn_end(bank);
Ray Lehtiniemi5e709822006-11-07 03:19:15 +0100107
Russell Kingbe370302010-05-07 17:40:33 +0100108 page = pfn_to_page(pfn1);
109 end = pfn_to_page(pfn2 - 1) + 1;
110
111 do {
112 total++;
113 if (PageReserved(page))
114 reserved++;
115 else if (PageSwapCache(page))
116 cached++;
117 else if (PageSlab(page))
118 slab++;
119 else if (!page_count(page))
120 free++;
121 else
122 shared += page_count(page) - 1;
123 page++;
Olav Hauganea5a90bd2011-11-07 13:58:35 -0800124#ifdef CONFIG_SPARSEMEM
125 pfn1++;
126 if (!(pfn1 % PAGES_PER_SECTION))
127 page = pfn_to_page(pfn1);
128 } while (pfn1 < pfn2);
129#else
Russell Kingbe370302010-05-07 17:40:33 +0100130 } while (page < end);
Olav Hauganea5a90bd2011-11-07 13:58:35 -0800131#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 }
133
134 printk("%d pages of RAM\n", total);
135 printk("%d free pages\n", free);
136 printk("%d reserved pages\n", reserved);
137 printk("%d slab pages\n", slab);
138 printk("%d pages shared\n", shared);
139 printk("%d pages swap cached\n", cached);
140}
141
Russell Kingf25b4b42010-10-27 19:49:33 +0100142static void __init find_limits(unsigned long *min, unsigned long *max_low,
143 unsigned long *max_high)
Russell Kingdde58282009-08-15 12:36:00 +0100144{
Russell Kingf25b4b42010-10-27 19:49:33 +0100145 struct meminfo *mi = &meminfo;
Russell Kingdde58282009-08-15 12:36:00 +0100146 int i;
147
148 *min = -1UL;
149 *max_low = *max_high = 0;
150
Russell Kingbe370302010-05-07 17:40:33 +0100151 for_each_bank (i, mi) {
Russell Kingdde58282009-08-15 12:36:00 +0100152 struct membank *bank = &mi->bank[i];
153 unsigned long start, end;
154
155 start = bank_pfn_start(bank);
156 end = bank_pfn_end(bank);
157
158 if (*min > start)
159 *min = start;
160 if (*max_high < end)
161 *max_high = end;
162 if (bank->highmem)
163 continue;
164 if (*max_low < end)
165 *max_low = end;
166 }
167}
168
Russell Kinga801d272010-10-27 19:27:44 +0100169static void __init arm_bootmem_init(unsigned long start_pfn,
170 unsigned long end_pfn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171{
Benjamin Herrenschmidt719c1512010-08-05 12:55:55 +1000172 struct memblock_region *reg;
Russell King90072052005-10-28 14:48:37 +0100173 unsigned int boot_pages;
Russell King2778f622010-07-09 16:27:52 +0100174 phys_addr_t bitmap;
Russell King90072052005-10-28 14:48:37 +0100175 pg_data_t *pgdat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 /*
Russell King2778f622010-07-09 16:27:52 +0100178 * Allocate the bootmem bitmap page. This must be in a region
179 * of memory which has already been mapped.
Russell King90072052005-10-28 14:48:37 +0100180 */
181 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
Russell King2778f622010-07-09 16:27:52 +0100182 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
183 __pfn_to_phys(end_pfn));
Russell King90072052005-10-28 14:48:37 +0100184
185 /*
Russell Kingbe370302010-05-07 17:40:33 +0100186 * Initialise the bootmem allocator, handing the
Russell King90072052005-10-28 14:48:37 +0100187 * memory banks over to bootmem.
188 */
Russell Kingbe370302010-05-07 17:40:33 +0100189 node_set_online(0);
190 pgdat = NODE_DATA(0);
Russell King2778f622010-07-09 16:27:52 +0100191 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
Russell King90072052005-10-28 14:48:37 +0100192
Russell Kinga801d272010-10-27 19:27:44 +0100193 /* Free the lowmem regions from memblock into bootmem. */
194 for_each_memblock(memory, reg) {
195 unsigned long start = memblock_region_memory_base_pfn(reg);
196 unsigned long end = memblock_region_memory_end_pfn(reg);
197
198 if (end >= end_pfn)
199 end = end_pfn;
200 if (start >= end)
201 break;
202
203 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
Russell Kingd2a38ef2008-10-01 16:56:15 +0100204 }
Russell King90072052005-10-28 14:48:37 +0100205
Russell Kinga801d272010-10-27 19:27:44 +0100206 /* Reserve the lowmem memblock reserved regions in bootmem. */
Benjamin Herrenschmidt719c1512010-08-05 12:55:55 +1000207 for_each_memblock(reserved, reg) {
Russell Kinga801d272010-10-27 19:27:44 +0100208 unsigned long start = memblock_region_reserved_base_pfn(reg);
209 unsigned long end = memblock_region_reserved_end_pfn(reg);
210
211 if (end >= end_pfn)
212 end = end_pfn;
213 if (start >= end)
214 break;
215
216 reserve_bootmem(__pfn_to_phys(start),
217 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
Russell Kingb7a69ac2008-10-01 16:58:32 +0100219}
220
Russell Kingbe209022011-05-11 15:39:00 +0100221#ifdef CONFIG_ZONE_DMA
222static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
223 unsigned long dma_size)
224{
225 if (size[0] <= dma_size)
226 return;
227
228 size[ZONE_NORMAL] = size[0] - dma_size;
229 size[ZONE_DMA] = dma_size;
230 hole[ZONE_NORMAL] = hole[0];
231 hole[ZONE_DMA] = 0;
232}
233#endif
234
Larry Basseld4e809e2011-09-08 10:46:49 -0700235#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
236static void __init arm_bootmem_free_apnm(unsigned long max_low,
237 unsigned long max_high)
238{
239 unsigned long max_zone_pfns[MAX_NR_ZONES];
240 struct memblock_region *reg;
241
242 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
243
244 max_zone_pfns[0] = max_low;
245#ifdef CONFIG_HIGHMEM
246 max_zone_pfns[ZONE_HIGHMEM] = max_high;
247#endif
248 for_each_memblock(memory, reg) {
249 unsigned long start = memblock_region_memory_base_pfn(reg);
250 unsigned long end = memblock_region_memory_end_pfn(reg);
251
252 add_active_range(0, start, end);
253 }
254 free_area_init_nodes(max_zone_pfns);
255}
256
257#else
Russell Kinga2c54d22010-10-27 19:17:31 +0100258static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
259 unsigned long max_high)
Russell Kingb7a69ac2008-10-01 16:58:32 +0100260{
261 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Russell Kinga2c54d22010-10-27 19:17:31 +0100262 struct memblock_region *reg;
Russell Kingb7a69ac2008-10-01 16:58:32 +0100263
Russell King90072052005-10-28 14:48:37 +0100264 /*
Russell Kingbe370302010-05-07 17:40:33 +0100265 * initialise the zones.
Russell King90072052005-10-28 14:48:37 +0100266 */
267 memset(zone_size, 0, sizeof(zone_size));
Russell King90072052005-10-28 14:48:37 +0100268
269 /*
Russell Kingbe370302010-05-07 17:40:33 +0100270 * The memory size has already been determined. If we need
271 * to do anything fancy with the allocation of this memory
272 * to the zones, now is the time to do it.
Russell King90072052005-10-28 14:48:37 +0100273 */
Russell Kingdde58282009-08-15 12:36:00 +0100274 zone_size[0] = max_low - min;
275#ifdef CONFIG_HIGHMEM
276 zone_size[ZONE_HIGHMEM] = max_high - max_low;
277#endif
Russell King90072052005-10-28 14:48:37 +0100278
279 /*
Russell Kingbe370302010-05-07 17:40:33 +0100280 * Calculate the size of the holes.
281 * holes = node_size - sum(bank_sizes)
Russell King90072052005-10-28 14:48:37 +0100282 */
Russell Kingdde58282009-08-15 12:36:00 +0100283 memcpy(zhole_size, zone_size, sizeof(zhole_size));
Russell Kinga2c54d22010-10-27 19:17:31 +0100284 for_each_memblock(memory, reg) {
285 unsigned long start = memblock_region_memory_base_pfn(reg);
286 unsigned long end = memblock_region_memory_end_pfn(reg);
287
288 if (start < max_low) {
289 unsigned long low_end = min(end, max_low);
290 zhole_size[0] -= low_end - start;
291 }
Russell Kingdde58282009-08-15 12:36:00 +0100292#ifdef CONFIG_HIGHMEM
Russell Kinga2c54d22010-10-27 19:17:31 +0100293 if (end > max_low) {
294 unsigned long high_start = max(start, max_low);
295 zhole_size[ZONE_HIGHMEM] -= end - high_start;
296 }
Russell Kingdde58282009-08-15 12:36:00 +0100297#endif
Russell Kingdde58282009-08-15 12:36:00 +0100298 }
Russell King90072052005-10-28 14:48:37 +0100299
Russell Kingbe209022011-05-11 15:39:00 +0100300#ifdef ARM_DMA_ZONE_SIZE
301#ifndef CONFIG_ZONE_DMA
302#error ARM_DMA_ZONE_SIZE set but no DMA zone to limit allocations
303#endif
304
Russell King90072052005-10-28 14:48:37 +0100305 /*
306 * Adjust the sizes according to any special requirements for
307 * this machine type.
308 */
Russell Kingbe209022011-05-11 15:39:00 +0100309 arm_adjust_dma_zone(zone_size, zhole_size,
310 ARM_DMA_ZONE_SIZE >> PAGE_SHIFT);
311#endif
Russell King90072052005-10-28 14:48:37 +0100312
Russell Kingbe370302010-05-07 17:40:33 +0100313 free_area_init_node(0, zone_size, min, zhole_size);
Russell King90072052005-10-28 14:48:37 +0100314}
Larry Basseld4e809e2011-09-08 10:46:49 -0700315#endif
Russell King90072052005-10-28 14:48:37 +0100316
Will Deacon7b7bf492011-05-19 13:21:14 +0100317#ifdef CONFIG_HAVE_ARCH_PFN_VALID
Russell Kingb7cfda92009-09-07 15:06:42 +0100318int pfn_valid(unsigned long pfn)
319{
Benjamin Herrenschmidt5e6f6aa2010-08-04 13:23:02 +1000320 return memblock_is_memory(pfn << PAGE_SHIFT);
Russell Kingb7cfda92009-09-07 15:06:42 +0100321}
322EXPORT_SYMBOL(pfn_valid);
Will Deacon7b7bf492011-05-19 13:21:14 +0100323#endif
Russell King657e12f2009-10-29 17:06:17 +0000324
Will Deacon7b7bf492011-05-19 13:21:14 +0100325#ifndef CONFIG_SPARSEMEM
Russell Kingeda2e5d2010-07-01 12:00:57 +0100326static void arm_memory_present(void)
Russell King657e12f2009-10-29 17:06:17 +0000327{
328}
329#else
Russell Kingeda2e5d2010-07-01 12:00:57 +0100330static void arm_memory_present(void)
Russell King657e12f2009-10-29 17:06:17 +0000331{
Benjamin Herrenschmidt719c1512010-08-05 12:55:55 +1000332 struct memblock_region *reg;
Benjamin Herrenschmidt719c1512010-08-05 12:55:55 +1000333
Yinghai Lu7c996362010-09-16 00:20:36 -0700334 for_each_memblock(memory, reg)
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700335 memory_present(0, memblock_region_memory_base_pfn(reg),
336 memblock_region_memory_end_pfn(reg));
Russell King657e12f2009-10-29 17:06:17 +0000337}
Russell Kingb7cfda92009-09-07 15:06:42 +0100338#endif
339
Russell King7dc50ec2010-10-27 18:14:56 +0100340static int __init meminfo_cmp(const void *_a, const void *_b)
341{
342 const struct membank *a = _a, *b = _b;
343 long cmp = bank_pfn_start(a) - bank_pfn_start(b);
344 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
345}
346
Larry Bassel150d5032011-09-20 14:32:13 -0700347#ifdef CONFIG_DONT_MAP_HOLE_AFTER_MEMBANK0
348unsigned long membank0_size;
349EXPORT_SYMBOL(membank0_size);
350unsigned long membank1_start;
351EXPORT_SYMBOL(membank1_start);
352#endif
353
Russell King8d717a52010-05-22 19:47:18 +0100354void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
Russell King2778f622010-07-09 16:27:52 +0100355{
356 int i;
357
Russell King7dc50ec2010-10-27 18:14:56 +0100358 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);
359
Russell King2778f622010-07-09 16:27:52 +0100360 memblock_init();
361 for (i = 0; i < mi->nr_banks; i++)
362 memblock_add(mi->bank[i].start, mi->bank[i].size);
363
Larry Bassel150d5032011-09-20 14:32:13 -0700364#ifdef CONFIG_DONT_MAP_HOLE_AFTER_MEMBANK0
365 membank0_size = meminfo.bank[0].size;
366 membank1_start = meminfo.bank[1].start;
367#endif
368
Russell King2778f622010-07-09 16:27:52 +0100369 /* Register the kernel text, kernel data and initrd with memblock. */
370#ifdef CONFIG_XIP_KERNEL
Russell King842eab42010-10-01 14:12:22 +0100371 memblock_reserve(__pa(_sdata), _end - _sdata);
Russell King2778f622010-07-09 16:27:52 +0100372#else
373 memblock_reserve(__pa(_stext), _end - _stext);
374#endif
375#ifdef CONFIG_BLK_DEV_INITRD
Russell Kingb0a26792011-01-30 11:21:05 +0000376 if (phys_initrd_size &&
Russell King8f4b8c72011-06-11 00:43:21 +0100377 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
378 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
379 phys_initrd_start, phys_initrd_size);
380 phys_initrd_start = phys_initrd_size = 0;
381 }
382 if (phys_initrd_size &&
Russell Kingb0a26792011-01-30 11:21:05 +0000383 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
384 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
385 phys_initrd_start, phys_initrd_size);
386 phys_initrd_start = phys_initrd_size = 0;
387 }
Russell King2778f622010-07-09 16:27:52 +0100388 if (phys_initrd_size) {
389 memblock_reserve(phys_initrd_start, phys_initrd_size);
390
391 /* Now convert initrd to virtual addresses */
392 initrd_start = __phys_to_virt(phys_initrd_start);
393 initrd_end = initrd_start + phys_initrd_size;
394 }
395#endif
396
397 arm_mm_memblock_reserve();
Grant Likely93c02ab2011-04-28 14:27:21 -0600398 arm_dt_memblock_reserve();
Russell King2778f622010-07-09 16:27:52 +0100399
Russell King8d717a52010-05-22 19:47:18 +0100400 /* reserve any platform specific memblock areas */
401 if (mdesc->reserve)
402 mdesc->reserve();
403
Russell King2778f622010-07-09 16:27:52 +0100404 memblock_analyze();
405 memblock_dump_all();
406}
407
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700408#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
409int _early_pfn_valid(unsigned long pfn)
410{
411 struct meminfo *mi = &meminfo;
412 unsigned int left = 0, right = mi->nr_banks;
413
414 do {
415 unsigned int mid = (right + left) / 2;
416 struct membank *bank = &mi->bank[mid];
417
418 if (pfn < bank_pfn_start(bank))
419 right = mid;
420 else if (pfn >= bank_pfn_end(bank))
421 left = mid + 1;
422 else
423 return 1;
424 } while (left < right);
425 return 0;
426}
427EXPORT_SYMBOL(_early_pfn_valid);
428#endif
429
Russell King8d717a52010-05-22 19:47:18 +0100430void __init bootmem_init(void)
Russell King90072052005-10-28 14:48:37 +0100431{
Russell Kingdde58282009-08-15 12:36:00 +0100432 unsigned long min, max_low, max_high;
Russell King90072052005-10-28 14:48:37 +0100433
Russell Kingdde58282009-08-15 12:36:00 +0100434 max_low = max_high = 0;
435
Russell Kingf25b4b42010-10-27 19:49:33 +0100436 find_limits(&min, &max_low, &max_high);
Russell Kingbe370302010-05-07 17:40:33 +0100437
Russell Kinga801d272010-10-27 19:27:44 +0100438 arm_bootmem_init(min, max_low);
Russell Kingbe370302010-05-07 17:40:33 +0100439
Russell Kingbe370302010-05-07 17:40:33 +0100440 /*
Russell Kingbe370302010-05-07 17:40:33 +0100441 * Sparsemem tries to allocate bootmem in memory_present(),
442 * so must be done after the fixed reservations
443 */
Russell Kingeda2e5d2010-07-01 12:00:57 +0100444 arm_memory_present();
Russell King90072052005-10-28 14:48:37 +0100445
Russell Kingb7a69ac2008-10-01 16:58:32 +0100446 /*
447 * sparse_init() needs the bootmem allocator up and running.
448 */
449 sparse_init();
450
Larry Basseld4e809e2011-09-08 10:46:49 -0700451#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
452 arm_bootmem_free_apnm(max_low, max_high);
453#else
Russell Kingb7a69ac2008-10-01 16:58:32 +0100454 /*
Russell Kingbe370302010-05-07 17:40:33 +0100455 * Now free the memory - free_area_init_node needs
Russell Kingb7a69ac2008-10-01 16:58:32 +0100456 * the sparse mem_map arrays initialized by sparse_init()
457 * for memmap_init_zone(), otherwise all PFNs are invalid.
458 */
Russell Kinga2c54d22010-10-27 19:17:31 +0100459 arm_bootmem_free(min, max_low, max_high);
Larry Basseld4e809e2011-09-08 10:46:49 -0700460#endif
Russell Kingb7a69ac2008-10-01 16:58:32 +0100461
Will Deaconcae62922011-02-15 12:42:57 +0100462 high_memory = __va(((phys_addr_t)max_low << PAGE_SHIFT) - 1) + 1;
Russell King90072052005-10-28 14:48:37 +0100463
464 /*
465 * This doesn't seem to be used by the Linux memory manager any
466 * more, but is used by ll_rw_block. If we can get rid of it, we
467 * also get rid of some of the stuff above as well.
468 *
469 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
470 * the system, not the maximum PFN.
471 */
Russell Kingdde58282009-08-15 12:36:00 +0100472 max_low_pfn = max_low - PHYS_PFN_OFFSET;
473 max_pfn = max_high - PHYS_PFN_OFFSET;
Russell King90072052005-10-28 14:48:37 +0100474}
475
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400476static inline int free_area(unsigned long pfn, unsigned long end, char *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400478 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400480 for (; pfn < end; pfn++) {
481 struct page *page = pfn_to_page(pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800483 init_page_count(page);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400484 __free_page(page);
485 pages++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 }
487
488 if (size && s)
489 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400490
491 return pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492}
493
Russell Kinga0130532005-06-27 14:16:47 +0100494static inline void
Russell Kingbe370302010-05-07 17:40:33 +0100495free_memmap(unsigned long start_pfn, unsigned long end_pfn)
Russell Kinga0130532005-06-27 14:16:47 +0100496{
497 struct page *start_pg, *end_pg;
498 unsigned long pg, pgend;
499
500 /*
501 * Convert start_pfn/end_pfn to a struct page pointer.
502 */
Catalin Marinas3257f432009-10-06 17:57:22 +0100503 start_pg = pfn_to_page(start_pfn - 1) + 1;
Will Deacon9af386c2011-04-28 18:44:31 +0100504 end_pg = pfn_to_page(end_pfn - 1) + 1;
Russell Kinga0130532005-06-27 14:16:47 +0100505
506 /*
507 * Convert to physical addresses, and
508 * round start upwards and end downwards.
509 */
Will Deaconcae62922011-02-15 12:42:57 +0100510 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
511 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
Russell Kinga0130532005-06-27 14:16:47 +0100512
513 /*
514 * If there are free pages between these,
515 * free the section of the memmap array.
516 */
517 if (pg < pgend)
Russell Kingbe370302010-05-07 17:40:33 +0100518 free_bootmem(pg, pgend - pg);
Russell Kinga0130532005-06-27 14:16:47 +0100519}
520
521/*
Michael Bohanccd78a42011-07-26 17:28:08 -0700522 * The mem_map array can get very big. Free as much of the unused portion of
523 * the mem_map that we are allowed to. The page migration code moves pages
524 * in blocks that are rounded per the MAX_ORDER_NR_PAGES definition, so we
525 * can't free mem_map entries that may be dereferenced in this manner.
Russell Kinga0130532005-06-27 14:16:47 +0100526 */
Russell Kingbe370302010-05-07 17:40:33 +0100527static void __init free_unused_memmap(struct meminfo *mi)
Russell Kinga0130532005-06-27 14:16:47 +0100528{
529 unsigned long bank_start, prev_bank_end = 0;
530 unsigned int i;
531
532 /*
Michael Bohan3260e522010-06-14 13:06:56 -0700533 * This relies on each bank being in address order.
534 * The banks are sorted previously in bootmem_init().
Russell Kinga0130532005-06-27 14:16:47 +0100535 */
Russell Kingbe370302010-05-07 17:40:33 +0100536 for_each_bank(i, mi) {
Russell Kingd2a38ef2008-10-01 16:56:15 +0100537 struct membank *bank = &mi->bank[i];
538
Michael Bohanccd78a42011-07-26 17:28:08 -0700539 bank_start = round_down(bank_pfn_start(bank),
540 MAX_ORDER_NR_PAGES);
Russell Kinga0130532005-06-27 14:16:47 +0100541
Will Deacon9af386c2011-04-28 18:44:31 +0100542#ifdef CONFIG_SPARSEMEM
543 /*
544 * Take care not to free memmap entries that don't exist
545 * due to SPARSEMEM sections which aren't present.
546 */
547 bank_start = min(bank_start,
548 ALIGN(prev_bank_end, PAGES_PER_SECTION));
Linus Walleij1289deb2011-09-29 09:37:23 +0100549#else
550 /*
551 * Align down here since the VM subsystem insists that the
552 * memmap entries are valid from the bank start aligned to
553 * MAX_ORDER_NR_PAGES.
554 */
555 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
Will Deacon9af386c2011-04-28 18:44:31 +0100556#endif
Russell Kinga0130532005-06-27 14:16:47 +0100557 /*
558 * If we had a previous bank, and there is a space
559 * between the current bank and the previous, free it.
560 */
Michael Bohan3260e522010-06-14 13:06:56 -0700561 if (prev_bank_end && prev_bank_end < bank_start)
Russell Kingbe370302010-05-07 17:40:33 +0100562 free_memmap(prev_bank_end, bank_start);
Russell Kinga0130532005-06-27 14:16:47 +0100563
Michael Bohanccd78a42011-07-26 17:28:08 -0700564 prev_bank_end = round_up(bank_pfn_end(bank),
565 MAX_ORDER_NR_PAGES);
Russell Kinga0130532005-06-27 14:16:47 +0100566 }
Will Deacon9af386c2011-04-28 18:44:31 +0100567
568#ifdef CONFIG_SPARSEMEM
569 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
570 free_memmap(prev_bank_end,
571 ALIGN(prev_bank_end, PAGES_PER_SECTION));
572#endif
Russell Kinga0130532005-06-27 14:16:47 +0100573}
574
Russell Kingd0e775a2010-10-27 19:37:06 +0100575static void __init free_highpages(void)
576{
577#ifdef CONFIG_HIGHMEM
Russell Kingdf4f14c2010-10-27 19:45:49 +0100578 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
579 struct memblock_region *mem, *res;
Russell Kingd0e775a2010-10-27 19:37:06 +0100580
581 /* set highmem page free */
Russell Kingdf4f14c2010-10-27 19:45:49 +0100582 for_each_memblock(memory, mem) {
583 unsigned long start = memblock_region_memory_base_pfn(mem);
584 unsigned long end = memblock_region_memory_end_pfn(mem);
585
586 /* Ignore complete lowmem entries */
587 if (end <= max_low)
588 continue;
589
590 /* Truncate partial highmem entries */
591 if (start < max_low)
592 start = max_low;
593
594 /* Find and exclude any reserved regions */
595 for_each_memblock(reserved, res) {
596 unsigned long res_start, res_end;
597
598 res_start = memblock_region_reserved_base_pfn(res);
599 res_end = memblock_region_reserved_end_pfn(res);
600
601 if (res_end < start)
602 continue;
603 if (res_start < start)
604 res_start = start;
605 if (res_start > end)
606 res_start = end;
607 if (res_end > end)
608 res_end = end;
609 if (res_start != start)
610 totalhigh_pages += free_area(start, res_start,
611 NULL);
612 start = res_end;
613 if (start == end)
614 break;
615 }
616
617 /* And now free anything which remains */
618 if (start < end)
Russell Kingd0e775a2010-10-27 19:37:06 +0100619 totalhigh_pages += free_area(start, end, NULL);
620 }
621 totalram_pages += totalhigh_pages;
622#endif
623}
624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625/*
626 * mem_init() marks the free areas in the mem_map and tells us how much
627 * memory is free. This is done after various parts of the system have
628 * claimed their memory after the kernel image.
629 */
630void __init mem_init(void)
631{
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100632 unsigned long reserved_pages, free_pages;
Russell King47ea3c12010-10-27 19:35:29 +0100633 struct memblock_region *reg;
Russell Kingbe370302010-05-07 17:40:33 +0100634 int i;
Linus Walleij1dbd30e2010-07-12 21:53:28 +0100635#ifdef CONFIG_HAVE_TCM
636 /* These pointers are filled in on TCM detection */
637 extern u32 dtcm_end;
638 extern u32 itcm_end;
639#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400641 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 /* this will put all unused low memory onto the freelists */
Russell Kingbe370302010-05-07 17:40:33 +0100644 free_unused_memmap(&meminfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Russell Kingbe370302010-05-07 17:40:33 +0100646 totalram_pages += free_all_bootmem();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648#ifdef CONFIG_SA1111
649 /* now that our DMA memory is actually so designated, we can free it */
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400650 totalram_pages += free_area(PHYS_PFN_OFFSET,
651 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652#endif
653
Russell Kingd0e775a2010-10-27 19:37:06 +0100654 free_highpages();
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400655
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100656 reserved_pages = free_pages = 0;
657
Russell Kingbe370302010-05-07 17:40:33 +0100658 for_each_bank(i, &meminfo) {
659 struct membank *bank = &meminfo.bank[i];
660 unsigned int pfn1, pfn2;
661 struct page *page, *end;
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100662
Russell Kingbe370302010-05-07 17:40:33 +0100663 pfn1 = bank_pfn_start(bank);
664 pfn2 = bank_pfn_end(bank);
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100665
Russell Kingbe370302010-05-07 17:40:33 +0100666 page = pfn_to_page(pfn1);
667 end = pfn_to_page(pfn2 - 1) + 1;
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100668
Russell Kingbe370302010-05-07 17:40:33 +0100669 do {
670 if (PageReserved(page))
671 reserved_pages++;
672 else if (!page_count(page))
673 free_pages++;
674 page++;
Larry Basselb2a4c822011-10-02 17:17:45 -0700675#ifdef CONFIG_SPARSEMEM
676 pfn1++;
677 if (!(pfn1 % PAGES_PER_SECTION))
678 page = pfn_to_page(pfn1);
679 } while (pfn1 < pfn2);
680#else
Russell Kingbe370302010-05-07 17:40:33 +0100681 } while (page < end);
Larry Basselb2a4c822011-10-02 17:17:45 -0700682#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100683 }
684
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 /*
686 * Since our memory may not be contiguous, calculate the
687 * real number of pages we have in this system
688 */
689 printk(KERN_INFO "Memory:");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 num_physpages = 0;
Russell King47ea3c12010-10-27 19:35:29 +0100691 for_each_memblock(memory, reg) {
692 unsigned long pages = memblock_region_memory_end_pfn(reg) -
693 memblock_region_memory_base_pfn(reg);
694 num_physpages += pages;
695 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400698
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100699 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
700 nr_free_pages() << (PAGE_SHIFT-10),
701 free_pages << (PAGE_SHIFT-10),
702 reserved_pages << (PAGE_SHIFT-10),
Andreas Fenkart4b529402010-01-08 14:42:31 -0800703 totalhigh_pages << (PAGE_SHIFT-10));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100705#define MLK(b, t) b, t, ((t) - (b)) >> 10
706#define MLM(b, t) b, t, ((t) - (b)) >> 20
707#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
708
709 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
710 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100711#ifdef CONFIG_HAVE_TCM
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100712 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100713 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
714#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100715 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
Fenkart/Bostandzhyana7bd08c2010-02-07 21:46:33 +0100716#ifdef CONFIG_MMU
717 " DMA : 0x%08lx - 0x%08lx (%4ld MB)\n"
718#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100719 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
720 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
721#ifdef CONFIG_HIGHMEM
722 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
723#endif
724 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
725 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
726 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
Rabin Vincent45f6d7e2011-06-02 15:01:36 +0100727 " .data : 0x%p" " - 0x%p" " (%4d kB)\n"
728 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n",
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100729
730 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
731 (PAGE_SIZE)),
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100732#ifdef CONFIG_HAVE_TCM
Linus Walleij1dbd30e2010-07-12 21:53:28 +0100733 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
734 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100735#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100736 MLK(FIXADDR_START, FIXADDR_TOP),
Fenkart/Bostandzhyana7bd08c2010-02-07 21:46:33 +0100737#ifdef CONFIG_MMU
738 MLM(CONSISTENT_BASE, CONSISTENT_END),
739#endif
Fenkart/Bostandzhyanc931b4f2010-02-07 21:47:17 +0100740 MLM(VMALLOC_START, VMALLOC_END),
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100741 MLM(PAGE_OFFSET, (unsigned long)high_memory),
742#ifdef CONFIG_HIGHMEM
743 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
744 (PAGE_SIZE)),
745#endif
746 MLM(MODULES_VADDR, MODULES_END),
747
748 MLK_ROUNDUP(__init_begin, __init_end),
749 MLK_ROUNDUP(_text, _etext),
Rabin Vincent45f6d7e2011-06-02 15:01:36 +0100750 MLK_ROUNDUP(_sdata, _edata),
751 MLK_ROUNDUP(__bss_start, __bss_stop));
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100752
753#undef MLK
754#undef MLM
755#undef MLK_ROUNDUP
756
Fenkart/Bostandzhyana1839272010-02-07 21:47:58 +0100757 /*
758 * Check boundaries twice: Some fundamental inconsistencies can
759 * be detected at build time already.
760 */
761#ifdef CONFIG_MMU
762 BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
763 BUG_ON(VMALLOC_END > CONSISTENT_BASE);
764
765 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
766 BUG_ON(TASK_SIZE > MODULES_VADDR);
767#endif
768
769#ifdef CONFIG_HIGHMEM
770 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
771 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
772#endif
773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
775 extern int sysctl_overcommit_memory;
776 /*
777 * On a machine this small we won't get
778 * anywhere without overcommit, so turn
779 * it on by default.
780 */
781 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
782 }
783}
784
785void free_initmem(void)
786{
Linus Walleijbc581772009-09-15 17:30:37 +0100787#ifdef CONFIG_HAVE_TCM
Linus Walleijea208f62010-05-26 07:37:57 +0100788 extern char __tcm_start, __tcm_end;
Linus Walleijbc581772009-09-15 17:30:37 +0100789
Linus Walleijea208f62010-05-26 07:37:57 +0100790 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
791 __phys_to_pfn(__pa(&__tcm_end)),
Linus Walleijbc581772009-09-15 17:30:37 +0100792 "TCM link");
793#endif
794
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400795 if (!machine_is_integrator() && !machine_is_cintegrator())
Russell King37efe642008-12-01 11:53:07 +0000796 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
797 __phys_to_pfn(__pa(__init_end)),
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400798 "init");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799}
800
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700801#ifdef CONFIG_MEMORY_HOTPLUG
802int arch_add_memory(int nid, u64 start, u64 size)
803{
804 struct pglist_data *pgdata = NODE_DATA(nid);
805 struct zone *zone = pgdata->node_zones + ZONE_MOVABLE;
806 unsigned long start_pfn = start >> PAGE_SHIFT;
807 unsigned long nr_pages = size >> PAGE_SHIFT;
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700808
Larry Bassel61fe4722011-07-12 14:09:27 -0700809 return __add_pages(nid, zone, start_pfn, nr_pages);
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700810}
811
812int arch_physical_active_memory(u64 start, u64 size)
813{
Larry Bassela4414b12011-08-04 11:11:02 -0700814 return platform_physical_active_pages(start, size);
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700815}
816
817int arch_physical_remove_memory(u64 start, u64 size)
818{
Larry Bassela4414b12011-08-04 11:11:02 -0700819 return platform_physical_remove_pages(start, size);
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700820}
821
822int arch_physical_low_power_memory(u64 start, u64 size)
823{
Larry Bassela4414b12011-08-04 11:11:02 -0700824 return platform_physical_low_power_pages(start, size);
Bryan Huntsman3f2bc4d2011-08-16 17:27:22 -0700825}
826#endif
827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828#ifdef CONFIG_BLK_DEV_INITRD
829
830static int keep_initrd;
831
832void free_initrd_mem(unsigned long start, unsigned long end)
833{
834 if (!keep_initrd)
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400835 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
836 __phys_to_pfn(__pa(end)),
837 "initrd");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838}
839
840static int __init keepinitrd_setup(char *__unused)
841{
842 keep_initrd = 1;
843 return 1;
844}
845
846__setup("keepinitrd", keepinitrd_setup);
847#endif