blob: 8f5813bbffb560b15b44974ff3543f0b5457e026 [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>
Paul Gortmakerdc280942011-07-31 16:17:29 -040016#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/nodemask.h>
18#include <linux/initrd.h>
Grant Likely9eb8f672011-04-28 14:27:20 -060019#include <linux/of_fdt.h>
Nicolas Pitre3835f6c2008-09-17 15:21:55 -040020#include <linux/highmem.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/gfp.h>
Russell King2778f622010-07-09 16:27:52 +010022#include <linux/memblock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <asm/mach-types.h>
Russell King716a3dc2012-01-13 15:00:51 +000025#include <asm/memblock.h>
Grant Likely93c02ab2011-04-28 14:27:21 -060026#include <asm/prom.h>
Russell King37efe642008-12-01 11:53:07 +000027#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <asm/setup.h>
Russell King74d02fb2006-04-04 21:47:43 +010029#include <asm/sizes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/tlb.h>
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +010031#include <asm/fixmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33#include <asm/mach/arch.h>
34#include <asm/mach/map.h>
35
Russell King1b2e2b72006-08-21 17:06:38 +010036#include "mm.h"
37
Russell King012d1f42008-09-06 10:57:03 +010038static unsigned long phys_initrd_start __initdata = 0;
39static unsigned long phys_initrd_size __initdata = 0;
40
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010041static int __init early_initrd(char *p)
Russell King012d1f42008-09-06 10:57:03 +010042{
43 unsigned long start, size;
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010044 char *endp;
Russell King012d1f42008-09-06 10:57:03 +010045
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010046 start = memparse(p, &endp);
47 if (*endp == ',') {
48 size = memparse(endp + 1, NULL);
Russell King012d1f42008-09-06 10:57:03 +010049
50 phys_initrd_start = start;
51 phys_initrd_size = size;
52 }
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010053 return 0;
Russell King012d1f42008-09-06 10:57:03 +010054}
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010055early_param("initrd", early_initrd);
Russell King012d1f42008-09-06 10:57:03 +010056
57static int __init parse_tag_initrd(const struct tag *tag)
58{
59 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
60 "please update your bootloader.\n");
61 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
62 phys_initrd_size = tag->u.initrd.size;
63 return 0;
64}
65
66__tagtable(ATAG_INITRD, parse_tag_initrd);
67
68static int __init parse_tag_initrd2(const struct tag *tag)
69{
70 phys_initrd_start = tag->u.initrd.start;
71 phys_initrd_size = tag->u.initrd.size;
72 return 0;
73}
74
75__tagtable(ATAG_INITRD2, parse_tag_initrd2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Grant Likely9eb8f672011-04-28 14:27:20 -060077#ifdef CONFIG_OF_FLATTREE
78void __init early_init_dt_setup_initrd_arch(unsigned long start, unsigned long end)
79{
80 phys_initrd_start = start;
81 phys_initrd_size = end - start;
82}
83#endif /* CONFIG_OF_FLATTREE */
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085/*
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040086 * This keeps memory configuration data used by a couple memory
87 * initialization functions, as well as show_mem() for the skipping
88 * of holes in the memory map. It is populated by arm_add_memory().
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 */
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040090struct meminfo meminfo;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010091
David Rientjesb2b755b2011-03-24 15:18:15 -070092void show_mem(unsigned int filter)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 int free = 0, total = 0, reserved = 0;
Russell Kingbe370302010-05-07 17:40:33 +010095 int shared = 0, cached = 0, slab = 0, i;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010096 struct meminfo * mi = &meminfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 printk("Mem-info:\n");
David Rientjes7bf02ea2011-05-24 17:11:16 -070099 show_free_areas(filter);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Russell Kingbe370302010-05-07 17:40:33 +0100101 for_each_bank (i, mi) {
102 struct membank *bank = &mi->bank[i];
103 unsigned int pfn1, pfn2;
104 struct page *page, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Russell Kingbe370302010-05-07 17:40:33 +0100106 pfn1 = bank_pfn_start(bank);
107 pfn2 = bank_pfn_end(bank);
Ray Lehtiniemi5e709822006-11-07 03:19:15 +0100108
Russell Kingbe370302010-05-07 17:40:33 +0100109 page = pfn_to_page(pfn1);
110 end = pfn_to_page(pfn2 - 1) + 1;
111
112 do {
113 total++;
114 if (PageReserved(page))
115 reserved++;
116 else if (PageSwapCache(page))
117 cached++;
118 else if (PageSlab(page))
119 slab++;
120 else if (!page_count(page))
121 free++;
122 else
123 shared += page_count(page) - 1;
124 page++;
125 } while (page < end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 }
127
128 printk("%d pages of RAM\n", total);
129 printk("%d free pages\n", free);
130 printk("%d reserved pages\n", reserved);
131 printk("%d slab pages\n", slab);
132 printk("%d pages shared\n", shared);
133 printk("%d pages swap cached\n", cached);
134}
135
Russell Kingf25b4b42010-10-27 19:49:33 +0100136static void __init find_limits(unsigned long *min, unsigned long *max_low,
Nicolas Pitre27a3f0e2011-08-25 19:10:29 -0400137 unsigned long *max_high)
Russell Kingdde58282009-08-15 12:36:00 +0100138{
Russell Kingf25b4b42010-10-27 19:49:33 +0100139 struct meminfo *mi = &meminfo;
Russell Kingdde58282009-08-15 12:36:00 +0100140 int i;
141
Nicolas Pitre27a3f0e2011-08-25 19:10:29 -0400142 /* This assumes the meminfo array is properly sorted */
143 *min = bank_pfn_start(&mi->bank[0]);
144 for_each_bank (i, mi)
145 if (mi->bank[i].highmem)
146 break;
147 *max_low = bank_pfn_end(&mi->bank[i - 1]);
148 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
Russell Kingdde58282009-08-15 12:36:00 +0100149}
150
Russell Kinga801d272010-10-27 19:27:44 +0100151static void __init arm_bootmem_init(unsigned long start_pfn,
152 unsigned long end_pfn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
Benjamin Herrenschmidt719c15142010-08-05 12:55:55 +1000154 struct memblock_region *reg;
Russell King90072052005-10-28 14:48:37 +0100155 unsigned int boot_pages;
Russell King2778f622010-07-09 16:27:52 +0100156 phys_addr_t bitmap;
Russell King90072052005-10-28 14:48:37 +0100157 pg_data_t *pgdat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 /*
Russell King2778f622010-07-09 16:27:52 +0100160 * Allocate the bootmem bitmap page. This must be in a region
161 * of memory which has already been mapped.
Russell King90072052005-10-28 14:48:37 +0100162 */
163 boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
Russell King2778f622010-07-09 16:27:52 +0100164 bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
165 __pfn_to_phys(end_pfn));
Russell King90072052005-10-28 14:48:37 +0100166
167 /*
Russell Kingbe370302010-05-07 17:40:33 +0100168 * Initialise the bootmem allocator, handing the
Russell King90072052005-10-28 14:48:37 +0100169 * memory banks over to bootmem.
170 */
Russell Kingbe370302010-05-07 17:40:33 +0100171 node_set_online(0);
172 pgdat = NODE_DATA(0);
Russell King2778f622010-07-09 16:27:52 +0100173 init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
Russell King90072052005-10-28 14:48:37 +0100174
Russell Kinga801d272010-10-27 19:27:44 +0100175 /* Free the lowmem regions from memblock into bootmem. */
176 for_each_memblock(memory, reg) {
177 unsigned long start = memblock_region_memory_base_pfn(reg);
178 unsigned long end = memblock_region_memory_end_pfn(reg);
179
180 if (end >= end_pfn)
181 end = end_pfn;
182 if (start >= end)
183 break;
184
185 free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
Russell Kingd2a38ef2008-10-01 16:56:15 +0100186 }
Russell King90072052005-10-28 14:48:37 +0100187
Russell Kinga801d272010-10-27 19:27:44 +0100188 /* Reserve the lowmem memblock reserved regions in bootmem. */
Benjamin Herrenschmidt719c15142010-08-05 12:55:55 +1000189 for_each_memblock(reserved, reg) {
Russell Kinga801d272010-10-27 19:27:44 +0100190 unsigned long start = memblock_region_reserved_base_pfn(reg);
191 unsigned long end = memblock_region_reserved_end_pfn(reg);
192
193 if (end >= end_pfn)
194 end = end_pfn;
195 if (start >= end)
196 break;
197
198 reserve_bootmem(__pfn_to_phys(start),
199 (end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
Russell Kingb7a69ac2008-10-01 16:58:32 +0100201}
202
Russell Kingbe209022011-05-11 15:39:00 +0100203#ifdef CONFIG_ZONE_DMA
Nicolas Pitre65032012011-07-18 15:05:10 -0400204
Nicolas Pitre65032012011-07-18 15:05:10 -0400205unsigned long arm_dma_zone_size __read_mostly;
Nicolas Pitre65032012011-07-18 15:05:10 -0400206EXPORT_SYMBOL(arm_dma_zone_size);
207
Russell King022ae532011-07-08 21:26:59 +0100208/*
209 * The DMA mask corresponding to the maximum bus address allocatable
210 * using GFP_DMA. The default here places no restriction on DMA
211 * allocations. This must be the smallest DMA mask in the system,
212 * so a successful GFP_DMA allocation will always satisfy this.
213 */
214u32 arm_dma_limit;
215
Russell Kingbe209022011-05-11 15:39:00 +0100216static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
217 unsigned long dma_size)
218{
219 if (size[0] <= dma_size)
220 return;
221
222 size[ZONE_NORMAL] = size[0] - dma_size;
223 size[ZONE_DMA] = dma_size;
224 hole[ZONE_NORMAL] = hole[0];
225 hole[ZONE_DMA] = 0;
226}
227#endif
228
Russell Kinga2c54d22010-10-27 19:17:31 +0100229static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
230 unsigned long max_high)
Russell Kingb7a69ac2008-10-01 16:58:32 +0100231{
232 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Russell Kinga2c54d22010-10-27 19:17:31 +0100233 struct memblock_region *reg;
Russell Kingb7a69ac2008-10-01 16:58:32 +0100234
Russell King90072052005-10-28 14:48:37 +0100235 /*
Russell Kingbe370302010-05-07 17:40:33 +0100236 * initialise the zones.
Russell King90072052005-10-28 14:48:37 +0100237 */
238 memset(zone_size, 0, sizeof(zone_size));
Russell King90072052005-10-28 14:48:37 +0100239
240 /*
Russell Kingbe370302010-05-07 17:40:33 +0100241 * The memory size has already been determined. If we need
242 * to do anything fancy with the allocation of this memory
243 * to the zones, now is the time to do it.
Russell King90072052005-10-28 14:48:37 +0100244 */
Russell Kingdde58282009-08-15 12:36:00 +0100245 zone_size[0] = max_low - min;
246#ifdef CONFIG_HIGHMEM
247 zone_size[ZONE_HIGHMEM] = max_high - max_low;
248#endif
Russell King90072052005-10-28 14:48:37 +0100249
250 /*
Russell Kingbe370302010-05-07 17:40:33 +0100251 * Calculate the size of the holes.
252 * holes = node_size - sum(bank_sizes)
Russell King90072052005-10-28 14:48:37 +0100253 */
Russell Kingdde58282009-08-15 12:36:00 +0100254 memcpy(zhole_size, zone_size, sizeof(zhole_size));
Russell Kinga2c54d22010-10-27 19:17:31 +0100255 for_each_memblock(memory, reg) {
256 unsigned long start = memblock_region_memory_base_pfn(reg);
257 unsigned long end = memblock_region_memory_end_pfn(reg);
258
259 if (start < max_low) {
260 unsigned long low_end = min(end, max_low);
261 zhole_size[0] -= low_end - start;
262 }
Russell Kingdde58282009-08-15 12:36:00 +0100263#ifdef CONFIG_HIGHMEM
Russell Kinga2c54d22010-10-27 19:17:31 +0100264 if (end > max_low) {
265 unsigned long high_start = max(start, max_low);
266 zhole_size[ZONE_HIGHMEM] -= end - high_start;
267 }
Russell Kingdde58282009-08-15 12:36:00 +0100268#endif
Russell Kingdde58282009-08-15 12:36:00 +0100269 }
Russell King90072052005-10-28 14:48:37 +0100270
Nicolas Pitre65032012011-07-18 15:05:10 -0400271#ifdef CONFIG_ZONE_DMA
Russell King90072052005-10-28 14:48:37 +0100272 /*
273 * Adjust the sizes according to any special requirements for
274 * this machine type.
275 */
Nicolas Pitre65032012011-07-18 15:05:10 -0400276 if (arm_dma_zone_size) {
277 arm_adjust_dma_zone(zone_size, zhole_size,
278 arm_dma_zone_size >> PAGE_SHIFT);
279 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
280 } else
281 arm_dma_limit = 0xffffffff;
Russell Kingbe209022011-05-11 15:39:00 +0100282#endif
Russell King90072052005-10-28 14:48:37 +0100283
Russell Kingbe370302010-05-07 17:40:33 +0100284 free_area_init_node(0, zone_size, min, zhole_size);
Russell King90072052005-10-28 14:48:37 +0100285}
286
Will Deacon7b7bf492011-05-19 13:21:14 +0100287#ifdef CONFIG_HAVE_ARCH_PFN_VALID
Russell Kingb7cfda92009-09-07 15:06:42 +0100288int pfn_valid(unsigned long pfn)
289{
Mark Rutlandfb492c92011-08-30 17:45:10 +0100290 return memblock_is_memory(__pfn_to_phys(pfn));
Russell Kingb7cfda92009-09-07 15:06:42 +0100291}
292EXPORT_SYMBOL(pfn_valid);
Will Deacon7b7bf492011-05-19 13:21:14 +0100293#endif
Russell King657e12f2009-10-29 17:06:17 +0000294
Will Deacon7b7bf492011-05-19 13:21:14 +0100295#ifndef CONFIG_SPARSEMEM
Stephen Boyd14904922012-04-27 01:40:10 +0100296static void __init arm_memory_present(void)
Russell King657e12f2009-10-29 17:06:17 +0000297{
298}
299#else
Stephen Boyd14904922012-04-27 01:40:10 +0100300static void __init arm_memory_present(void)
Russell King657e12f2009-10-29 17:06:17 +0000301{
Benjamin Herrenschmidt719c15142010-08-05 12:55:55 +1000302 struct memblock_region *reg;
Benjamin Herrenschmidt719c15142010-08-05 12:55:55 +1000303
Yinghai Lu7c996362010-09-16 00:20:36 -0700304 for_each_memblock(memory, reg)
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700305 memory_present(0, memblock_region_memory_base_pfn(reg),
306 memblock_region_memory_end_pfn(reg));
Russell King657e12f2009-10-29 17:06:17 +0000307}
Russell Kingb7cfda92009-09-07 15:06:42 +0100308#endif
309
Russell King716a3dc2012-01-13 15:00:51 +0000310static bool arm_memblock_steal_permitted = true;
311
Russell Kingbc2827d2012-01-19 14:35:19 +0000312phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
Russell King716a3dc2012-01-13 15:00:51 +0000313{
314 phys_addr_t phys;
315
316 BUG_ON(!arm_memblock_steal_permitted);
317
318 phys = memblock_alloc(size, align);
319 memblock_free(phys, size);
320 memblock_remove(phys, size);
321
322 return phys;
323}
324
Russell King8d717a52010-05-22 19:47:18 +0100325void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)
Russell King2778f622010-07-09 16:27:52 +0100326{
327 int i;
328
Russell King2778f622010-07-09 16:27:52 +0100329 for (i = 0; i < mi->nr_banks; i++)
330 memblock_add(mi->bank[i].start, mi->bank[i].size);
331
332 /* Register the kernel text, kernel data and initrd with memblock. */
333#ifdef CONFIG_XIP_KERNEL
Russell King842eab42010-10-01 14:12:22 +0100334 memblock_reserve(__pa(_sdata), _end - _sdata);
Russell King2778f622010-07-09 16:27:52 +0100335#else
336 memblock_reserve(__pa(_stext), _end - _stext);
337#endif
338#ifdef CONFIG_BLK_DEV_INITRD
Russell Kingb0a26792011-01-30 11:21:05 +0000339 if (phys_initrd_size &&
Russell King8f4b8c72011-06-11 00:43:21 +0100340 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
341 pr_err("INITRD: 0x%08lx+0x%08lx is not a memory region - disabling initrd\n",
342 phys_initrd_start, phys_initrd_size);
343 phys_initrd_start = phys_initrd_size = 0;
344 }
345 if (phys_initrd_size &&
Russell Kingb0a26792011-01-30 11:21:05 +0000346 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
347 pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region - disabling initrd\n",
348 phys_initrd_start, phys_initrd_size);
349 phys_initrd_start = phys_initrd_size = 0;
350 }
Russell King2778f622010-07-09 16:27:52 +0100351 if (phys_initrd_size) {
352 memblock_reserve(phys_initrd_start, phys_initrd_size);
353
354 /* Now convert initrd to virtual addresses */
355 initrd_start = __phys_to_virt(phys_initrd_start);
356 initrd_end = initrd_start + phys_initrd_size;
357 }
358#endif
359
360 arm_mm_memblock_reserve();
Grant Likely93c02ab2011-04-28 14:27:21 -0600361 arm_dt_memblock_reserve();
Russell King2778f622010-07-09 16:27:52 +0100362
Russell King8d717a52010-05-22 19:47:18 +0100363 /* reserve any platform specific memblock areas */
364 if (mdesc->reserve)
365 mdesc->reserve();
366
Russell King716a3dc2012-01-13 15:00:51 +0000367 arm_memblock_steal_permitted = false;
Tejun Heo1aadc052011-12-08 10:22:08 -0800368 memblock_allow_resize();
Russell King2778f622010-07-09 16:27:52 +0100369 memblock_dump_all();
370}
371
Russell King8d717a52010-05-22 19:47:18 +0100372void __init bootmem_init(void)
Russell King90072052005-10-28 14:48:37 +0100373{
Russell Kingdde58282009-08-15 12:36:00 +0100374 unsigned long min, max_low, max_high;
Russell King90072052005-10-28 14:48:37 +0100375
Russell Kingdde58282009-08-15 12:36:00 +0100376 max_low = max_high = 0;
377
Russell Kingf25b4b42010-10-27 19:49:33 +0100378 find_limits(&min, &max_low, &max_high);
Russell Kingbe370302010-05-07 17:40:33 +0100379
Russell Kinga801d272010-10-27 19:27:44 +0100380 arm_bootmem_init(min, max_low);
Russell Kingbe370302010-05-07 17:40:33 +0100381
Russell Kingbe370302010-05-07 17:40:33 +0100382 /*
Russell Kingbe370302010-05-07 17:40:33 +0100383 * Sparsemem tries to allocate bootmem in memory_present(),
384 * so must be done after the fixed reservations
385 */
Russell Kingeda2e5d2010-07-01 12:00:57 +0100386 arm_memory_present();
Russell King90072052005-10-28 14:48:37 +0100387
Russell Kingb7a69ac2008-10-01 16:58:32 +0100388 /*
389 * sparse_init() needs the bootmem allocator up and running.
390 */
391 sparse_init();
392
393 /*
Russell Kingbe370302010-05-07 17:40:33 +0100394 * Now free the memory - free_area_init_node needs
Russell Kingb7a69ac2008-10-01 16:58:32 +0100395 * the sparse mem_map arrays initialized by sparse_init()
396 * for memmap_init_zone(), otherwise all PFNs are invalid.
397 */
Russell Kinga2c54d22010-10-27 19:17:31 +0100398 arm_bootmem_free(min, max_low, max_high);
Russell Kingb7a69ac2008-10-01 16:58:32 +0100399
Russell King90072052005-10-28 14:48:37 +0100400 /*
401 * This doesn't seem to be used by the Linux memory manager any
402 * more, but is used by ll_rw_block. If we can get rid of it, we
403 * also get rid of some of the stuff above as well.
404 *
405 * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
406 * the system, not the maximum PFN.
407 */
Russell Kingdde58282009-08-15 12:36:00 +0100408 max_low_pfn = max_low - PHYS_PFN_OFFSET;
409 max_pfn = max_high - PHYS_PFN_OFFSET;
Russell King90072052005-10-28 14:48:37 +0100410}
411
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400412static inline int free_area(unsigned long pfn, unsigned long end, char *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413{
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400414 unsigned int pages = 0, size = (end - pfn) << (PAGE_SHIFT - 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400416 for (; pfn < end; pfn++) {
417 struct page *page = pfn_to_page(pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 ClearPageReserved(page);
Nick Piggin7835e982006-03-22 00:08:40 -0800419 init_page_count(page);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400420 __free_page(page);
421 pages++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 }
423
424 if (size && s)
425 printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400426
427 return pages;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428}
429
Stephen Boyd54d52572011-07-07 18:43:36 +0100430/*
431 * Poison init memory with an undefined instruction (ARM) or a branch to an
432 * undefined instruction (Thumb).
433 */
434static inline void poison_init_mem(void *s, size_t count)
435{
436 u32 *p = (u32 *)s;
Jamie Ilesbf912d92011-08-04 09:39:31 +0100437 for (; count != 0; count -= 4)
Stephen Boyd54d52572011-07-07 18:43:36 +0100438 *p++ = 0xe7fddef0;
439}
440
Russell Kinga0130532005-06-27 14:16:47 +0100441static inline void
Russell Kingbe370302010-05-07 17:40:33 +0100442free_memmap(unsigned long start_pfn, unsigned long end_pfn)
Russell Kinga0130532005-06-27 14:16:47 +0100443{
444 struct page *start_pg, *end_pg;
445 unsigned long pg, pgend;
446
447 /*
448 * Convert start_pfn/end_pfn to a struct page pointer.
449 */
Catalin Marinas3257f432009-10-06 17:57:22 +0100450 start_pg = pfn_to_page(start_pfn - 1) + 1;
Will Deacon9af386c2011-04-28 18:44:31 +0100451 end_pg = pfn_to_page(end_pfn - 1) + 1;
Russell Kinga0130532005-06-27 14:16:47 +0100452
453 /*
454 * Convert to physical addresses, and
455 * round start upwards and end downwards.
456 */
Will Deaconcae62922011-02-15 12:42:57 +0100457 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
458 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
Russell Kinga0130532005-06-27 14:16:47 +0100459
460 /*
461 * If there are free pages between these,
462 * free the section of the memmap array.
463 */
464 if (pg < pgend)
Russell Kingbe370302010-05-07 17:40:33 +0100465 free_bootmem(pg, pgend - pg);
Russell Kinga0130532005-06-27 14:16:47 +0100466}
467
468/*
469 * The mem_map array can get very big. Free the unused area of the memory map.
470 */
Russell Kingbe370302010-05-07 17:40:33 +0100471static void __init free_unused_memmap(struct meminfo *mi)
Russell Kinga0130532005-06-27 14:16:47 +0100472{
473 unsigned long bank_start, prev_bank_end = 0;
474 unsigned int i;
475
476 /*
Michael Bohan3260e522010-06-14 13:06:56 -0700477 * This relies on each bank being in address order.
478 * The banks are sorted previously in bootmem_init().
Russell Kinga0130532005-06-27 14:16:47 +0100479 */
Russell Kingbe370302010-05-07 17:40:33 +0100480 for_each_bank(i, mi) {
Russell Kingd2a38ef2008-10-01 16:56:15 +0100481 struct membank *bank = &mi->bank[i];
482
483 bank_start = bank_pfn_start(bank);
Russell Kinga0130532005-06-27 14:16:47 +0100484
Will Deacon9af386c2011-04-28 18:44:31 +0100485#ifdef CONFIG_SPARSEMEM
486 /*
487 * Take care not to free memmap entries that don't exist
488 * due to SPARSEMEM sections which aren't present.
489 */
490 bank_start = min(bank_start,
491 ALIGN(prev_bank_end, PAGES_PER_SECTION));
Linus Walleij002ea9eef2011-09-29 09:37:23 +0100492#else
493 /*
494 * Align down here since the VM subsystem insists that the
495 * memmap entries are valid from the bank start aligned to
496 * MAX_ORDER_NR_PAGES.
497 */
498 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
Will Deacon9af386c2011-04-28 18:44:31 +0100499#endif
Russell Kinga0130532005-06-27 14:16:47 +0100500 /*
501 * If we had a previous bank, and there is a space
502 * between the current bank and the previous, free it.
503 */
Michael Bohan3260e522010-06-14 13:06:56 -0700504 if (prev_bank_end && prev_bank_end < bank_start)
Russell Kingbe370302010-05-07 17:40:33 +0100505 free_memmap(prev_bank_end, bank_start);
Russell Kinga0130532005-06-27 14:16:47 +0100506
Michael Bohan3260e522010-06-14 13:06:56 -0700507 /*
508 * Align up here since the VM subsystem insists that the
509 * memmap entries are valid from the bank end aligned to
510 * MAX_ORDER_NR_PAGES.
511 */
512 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
Russell Kinga0130532005-06-27 14:16:47 +0100513 }
Will Deacon9af386c2011-04-28 18:44:31 +0100514
515#ifdef CONFIG_SPARSEMEM
516 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
517 free_memmap(prev_bank_end,
518 ALIGN(prev_bank_end, PAGES_PER_SECTION));
519#endif
Russell Kinga0130532005-06-27 14:16:47 +0100520}
521
Russell Kingd0e775a2010-10-27 19:37:06 +0100522static void __init free_highpages(void)
523{
524#ifdef CONFIG_HIGHMEM
Russell Kingdf4f14c2010-10-27 19:45:49 +0100525 unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
526 struct memblock_region *mem, *res;
Russell Kingd0e775a2010-10-27 19:37:06 +0100527
528 /* set highmem page free */
Russell Kingdf4f14c2010-10-27 19:45:49 +0100529 for_each_memblock(memory, mem) {
530 unsigned long start = memblock_region_memory_base_pfn(mem);
531 unsigned long end = memblock_region_memory_end_pfn(mem);
532
533 /* Ignore complete lowmem entries */
534 if (end <= max_low)
535 continue;
536
537 /* Truncate partial highmem entries */
538 if (start < max_low)
539 start = max_low;
540
541 /* Find and exclude any reserved regions */
542 for_each_memblock(reserved, res) {
543 unsigned long res_start, res_end;
544
545 res_start = memblock_region_reserved_base_pfn(res);
546 res_end = memblock_region_reserved_end_pfn(res);
547
548 if (res_end < start)
549 continue;
550 if (res_start < start)
551 res_start = start;
552 if (res_start > end)
553 res_start = end;
554 if (res_end > end)
555 res_end = end;
556 if (res_start != start)
557 totalhigh_pages += free_area(start, res_start,
558 NULL);
559 start = res_end;
560 if (start == end)
561 break;
562 }
563
564 /* And now free anything which remains */
565 if (start < end)
Russell Kingd0e775a2010-10-27 19:37:06 +0100566 totalhigh_pages += free_area(start, end, NULL);
567 }
568 totalram_pages += totalhigh_pages;
569#endif
570}
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572/*
573 * mem_init() marks the free areas in the mem_map and tells us how much
574 * memory is free. This is done after various parts of the system have
575 * claimed their memory after the kernel image.
576 */
577void __init mem_init(void)
578{
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100579 unsigned long reserved_pages, free_pages;
Russell King47ea3c12010-10-27 19:35:29 +0100580 struct memblock_region *reg;
Russell Kingbe370302010-05-07 17:40:33 +0100581 int i;
Linus Walleij1dbd30e2010-07-12 21:53:28 +0100582#ifdef CONFIG_HAVE_TCM
583 /* These pointers are filled in on TCM detection */
584 extern u32 dtcm_end;
585 extern u32 itcm_end;
586#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400588 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /* this will put all unused low memory onto the freelists */
Russell Kingbe370302010-05-07 17:40:33 +0100591 free_unused_memmap(&meminfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Russell Kingbe370302010-05-07 17:40:33 +0100593 totalram_pages += free_all_bootmem();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595#ifdef CONFIG_SA1111
596 /* now that our DMA memory is actually so designated, we can free it */
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400597 totalram_pages += free_area(PHYS_PFN_OFFSET,
598 __phys_to_pfn(__pa(swapper_pg_dir)), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599#endif
600
Russell Kingd0e775a2010-10-27 19:37:06 +0100601 free_highpages();
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400602
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100603 reserved_pages = free_pages = 0;
604
Russell Kingbe370302010-05-07 17:40:33 +0100605 for_each_bank(i, &meminfo) {
606 struct membank *bank = &meminfo.bank[i];
607 unsigned int pfn1, pfn2;
608 struct page *page, *end;
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100609
Russell Kingbe370302010-05-07 17:40:33 +0100610 pfn1 = bank_pfn_start(bank);
611 pfn2 = bank_pfn_end(bank);
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100612
Russell Kingbe370302010-05-07 17:40:33 +0100613 page = pfn_to_page(pfn1);
614 end = pfn_to_page(pfn2 - 1) + 1;
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100615
Russell Kingbe370302010-05-07 17:40:33 +0100616 do {
617 if (PageReserved(page))
618 reserved_pages++;
619 else if (!page_count(page))
620 free_pages++;
621 page++;
622 } while (page < end);
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100623 }
624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 /*
626 * Since our memory may not be contiguous, calculate the
627 * real number of pages we have in this system
628 */
629 printk(KERN_INFO "Memory:");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 num_physpages = 0;
Russell King47ea3c12010-10-27 19:35:29 +0100631 for_each_memblock(memory, reg) {
632 unsigned long pages = memblock_region_memory_end_pfn(reg) -
633 memblock_region_memory_base_pfn(reg);
634 num_physpages += pages;
635 printk(" %ldMB", pages >> (20 - PAGE_SHIFT));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400638
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100639 printk(KERN_NOTICE "Memory: %luk/%luk available, %luk reserved, %luK highmem\n",
640 nr_free_pages() << (PAGE_SHIFT-10),
641 free_pages << (PAGE_SHIFT-10),
642 reserved_pages << (PAGE_SHIFT-10),
Andreas Fenkart4b529402010-01-08 14:42:31 -0800643 totalhigh_pages << (PAGE_SHIFT-10));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100645#define MLK(b, t) b, t, ((t) - (b)) >> 10
646#define MLM(b, t) b, t, ((t) - (b)) >> 20
647#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
648
649 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
650 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100651#ifdef CONFIG_HAVE_TCM
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100652 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100653 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
654#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100655 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
656 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
657 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
658#ifdef CONFIG_HIGHMEM
659 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
660#endif
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100661#ifdef CONFIG_MODULES
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100662 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100663#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100664 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
Russell King3835d692011-07-06 10:39:34 +0100665 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
Rabin Vincent45f6d7e2011-06-02 15:01:36 +0100666 " .data : 0x%p" " - 0x%p" " (%4d kB)\n"
667 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n",
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100668
669 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
670 (PAGE_SIZE)),
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100671#ifdef CONFIG_HAVE_TCM
Linus Walleij1dbd30e2010-07-12 21:53:28 +0100672 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
673 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100674#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100675 MLK(FIXADDR_START, FIXADDR_TOP),
Fenkart/Bostandzhyanc931b4f2010-02-07 21:47:17 +0100676 MLM(VMALLOC_START, VMALLOC_END),
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100677 MLM(PAGE_OFFSET, (unsigned long)high_memory),
678#ifdef CONFIG_HIGHMEM
679 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
680 (PAGE_SIZE)),
681#endif
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100682#ifdef CONFIG_MODULES
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100683 MLM(MODULES_VADDR, MODULES_END),
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100684#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100685
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100686 MLK_ROUNDUP(_text, _etext),
Russell King3835d692011-07-06 10:39:34 +0100687 MLK_ROUNDUP(__init_begin, __init_end),
Rabin Vincent45f6d7e2011-06-02 15:01:36 +0100688 MLK_ROUNDUP(_sdata, _edata),
689 MLK_ROUNDUP(__bss_start, __bss_stop));
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100690
691#undef MLK
692#undef MLM
693#undef MLK_ROUNDUP
694
Fenkart/Bostandzhyana1839272010-02-07 21:47:58 +0100695 /*
696 * Check boundaries twice: Some fundamental inconsistencies can
697 * be detected at build time already.
698 */
699#ifdef CONFIG_MMU
Fenkart/Bostandzhyana1839272010-02-07 21:47:58 +0100700 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
701 BUG_ON(TASK_SIZE > MODULES_VADDR);
702#endif
703
704#ifdef CONFIG_HIGHMEM
705 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
706 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
707#endif
708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
710 extern int sysctl_overcommit_memory;
711 /*
712 * On a machine this small we won't get
713 * anywhere without overcommit, so turn
714 * it on by default.
715 */
716 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
717 }
718}
719
720void free_initmem(void)
721{
Linus Walleijbc581772009-09-15 17:30:37 +0100722#ifdef CONFIG_HAVE_TCM
Linus Walleijea208f62010-05-26 07:37:57 +0100723 extern char __tcm_start, __tcm_end;
Linus Walleijbc581772009-09-15 17:30:37 +0100724
Stephen Boyd54d52572011-07-07 18:43:36 +0100725 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
Linus Walleijea208f62010-05-26 07:37:57 +0100726 totalram_pages += free_area(__phys_to_pfn(__pa(&__tcm_start)),
727 __phys_to_pfn(__pa(&__tcm_end)),
Linus Walleijbc581772009-09-15 17:30:37 +0100728 "TCM link");
729#endif
730
Stephen Boyd54d52572011-07-07 18:43:36 +0100731 poison_init_mem(__init_begin, __init_end - __init_begin);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400732 if (!machine_is_integrator() && !machine_is_cintegrator())
Russell King37efe642008-12-01 11:53:07 +0000733 totalram_pages += free_area(__phys_to_pfn(__pa(__init_begin)),
734 __phys_to_pfn(__pa(__init_end)),
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400735 "init");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736}
737
738#ifdef CONFIG_BLK_DEV_INITRD
739
740static int keep_initrd;
741
742void free_initrd_mem(unsigned long start, unsigned long end)
743{
Stephen Boyd54d52572011-07-07 18:43:36 +0100744 if (!keep_initrd) {
745 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400746 totalram_pages += free_area(__phys_to_pfn(__pa(start)),
747 __phys_to_pfn(__pa(end)),
748 "initrd");
Stephen Boyd54d52572011-07-07 18:43:36 +0100749 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750}
751
752static int __init keepinitrd_setup(char *__unused)
753{
754 keep_initrd = 1;
755 return 1;
756}
757
758__setup("keepinitrd", keepinitrd_setup);
759#endif