blob: 2a77ba8796aeed0d6f6bf0e769422d557196ddba [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>
Marek Szyprowskic7909502011-12-29 13:09:51 +010023#include <linux/dma-contiguous.h>
Alessandro Rubini158e8bf2012-06-24 12:46:26 +010024#include <linux/sizes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include <asm/mach-types.h>
Russell King716a3dc2012-01-13 15:00:51 +000027#include <asm/memblock.h>
Grant Likely93c02ab2011-04-28 14:27:21 -060028#include <asm/prom.h>
Russell King37efe642008-12-01 11:53:07 +000029#include <asm/sections.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <asm/setup.h>
31#include <asm/tlb.h>
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +010032#include <asm/fixmap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include <asm/mach/arch.h>
35#include <asm/mach/map.h>
36
Russell King1b2e2b72006-08-21 17:06:38 +010037#include "mm.h"
38
Vitaly Andrianovde22cc62012-06-22 14:26:04 -040039static phys_addr_t phys_initrd_start __initdata = 0;
Russell King012d1f42008-09-06 10:57:03 +010040static unsigned long phys_initrd_size __initdata = 0;
41
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010042static int __init early_initrd(char *p)
Russell King012d1f42008-09-06 10:57:03 +010043{
Vitaly Andrianovde22cc62012-06-22 14:26:04 -040044 phys_addr_t start;
45 unsigned long size;
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010046 char *endp;
Russell King012d1f42008-09-06 10:57:03 +010047
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010048 start = memparse(p, &endp);
49 if (*endp == ',') {
50 size = memparse(endp + 1, NULL);
Russell King012d1f42008-09-06 10:57:03 +010051
52 phys_initrd_start = start;
53 phys_initrd_size = size;
54 }
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010055 return 0;
Russell King012d1f42008-09-06 10:57:03 +010056}
Jeremy Kerr2b0d8c22010-01-11 23:17:34 +010057early_param("initrd", early_initrd);
Russell King012d1f42008-09-06 10:57:03 +010058
59static int __init parse_tag_initrd(const struct tag *tag)
60{
61 printk(KERN_WARNING "ATAG_INITRD is deprecated; "
62 "please update your bootloader.\n");
63 phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
64 phys_initrd_size = tag->u.initrd.size;
65 return 0;
66}
67
68__tagtable(ATAG_INITRD, parse_tag_initrd);
69
70static int __init parse_tag_initrd2(const struct tag *tag)
71{
72 phys_initrd_start = tag->u.initrd.start;
73 phys_initrd_size = tag->u.initrd.size;
74 return 0;
75}
76
77__tagtable(ATAG_INITRD2, parse_tag_initrd2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79/*
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040080 * This keeps memory configuration data used by a couple memory
81 * initialization functions, as well as show_mem() for the skipping
82 * of holes in the memory map. It is populated by arm_add_memory().
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 */
Nicolas Pitre4b5f32c2008-10-06 13:24:40 -040084struct meminfo meminfo;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010085
David Rientjesb2b755b2011-03-24 15:18:15 -070086void show_mem(unsigned int filter)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
88 int free = 0, total = 0, reserved = 0;
Russell Kingbe370302010-05-07 17:40:33 +010089 int shared = 0, cached = 0, slab = 0, i;
Ray Lehtiniemi5e709822006-11-07 03:19:15 +010090 struct meminfo * mi = &meminfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 printk("Mem-info:\n");
David Rientjes7bf02ea2011-05-24 17:11:16 -070093 show_free_areas(filter);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
Russell Kingbe370302010-05-07 17:40:33 +010095 for_each_bank (i, mi) {
96 struct membank *bank = &mi->bank[i];
97 unsigned int pfn1, pfn2;
98 struct page *page, *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Russell Kingbe370302010-05-07 17:40:33 +0100100 pfn1 = bank_pfn_start(bank);
101 pfn2 = bank_pfn_end(bank);
Ray Lehtiniemi5e709822006-11-07 03:19:15 +0100102
Russell Kingbe370302010-05-07 17:40:33 +0100103 page = pfn_to_page(pfn1);
104 end = pfn_to_page(pfn2 - 1) + 1;
105
106 do {
107 total++;
108 if (PageReserved(page))
109 reserved++;
110 else if (PageSwapCache(page))
111 cached++;
112 else if (PageSlab(page))
113 slab++;
114 else if (!page_count(page))
115 free++;
116 else
117 shared += page_count(page) - 1;
118 page++;
119 } while (page < end);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 }
121
122 printk("%d pages of RAM\n", total);
123 printk("%d free pages\n", free);
124 printk("%d reserved pages\n", reserved);
125 printk("%d slab pages\n", slab);
126 printk("%d pages shared\n", shared);
127 printk("%d pages swap cached\n", cached);
128}
129
Russell Kingf25b4b42010-10-27 19:49:33 +0100130static void __init find_limits(unsigned long *min, unsigned long *max_low,
Nicolas Pitre27a3f0e2011-08-25 19:10:29 -0400131 unsigned long *max_high)
Russell Kingdde58282009-08-15 12:36:00 +0100132{
Russell Kingf25b4b42010-10-27 19:49:33 +0100133 struct meminfo *mi = &meminfo;
Russell Kingdde58282009-08-15 12:36:00 +0100134 int i;
135
Nicolas Pitre27a3f0e2011-08-25 19:10:29 -0400136 /* This assumes the meminfo array is properly sorted */
137 *min = bank_pfn_start(&mi->bank[0]);
138 for_each_bank (i, mi)
139 if (mi->bank[i].highmem)
140 break;
141 *max_low = bank_pfn_end(&mi->bank[i - 1]);
142 *max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);
Russell Kingdde58282009-08-15 12:36:00 +0100143}
144
Russell Kingbe209022011-05-11 15:39:00 +0100145#ifdef CONFIG_ZONE_DMA
Nicolas Pitre65032012011-07-18 15:05:10 -0400146
Rob Herring364230b2013-08-01 15:29:29 -0500147phys_addr_t arm_dma_zone_size __read_mostly;
Nicolas Pitre65032012011-07-18 15:05:10 -0400148EXPORT_SYMBOL(arm_dma_zone_size);
149
Russell King022ae532011-07-08 21:26:59 +0100150/*
151 * The DMA mask corresponding to the maximum bus address allocatable
152 * using GFP_DMA. The default here places no restriction on DMA
153 * allocations. This must be the smallest DMA mask in the system,
154 * so a successful GFP_DMA allocation will always satisfy this.
155 */
Marek Szyprowski4986e5c2012-06-06 12:05:01 +0200156phys_addr_t arm_dma_limit;
Russell King4dcfa602013-07-09 12:14:49 +0100157unsigned long arm_dma_pfn_limit;
Russell King022ae532011-07-08 21:26:59 +0100158
Russell Kingbe209022011-05-11 15:39:00 +0100159static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole,
160 unsigned long dma_size)
161{
162 if (size[0] <= dma_size)
163 return;
164
165 size[ZONE_NORMAL] = size[0] - dma_size;
166 size[ZONE_DMA] = dma_size;
167 hole[ZONE_NORMAL] = hole[0];
168 hole[ZONE_DMA] = 0;
169}
170#endif
171
Russell Kingff69a4c2013-07-26 14:55:59 +0100172void __init setup_dma_zone(const struct machine_desc *mdesc)
Marek Szyprowskic7909502011-12-29 13:09:51 +0100173{
174#ifdef CONFIG_ZONE_DMA
175 if (mdesc->dma_zone_size) {
176 arm_dma_zone_size = mdesc->dma_zone_size;
Russell King6bcac802014-01-07 17:53:54 +0000177 arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100178 } else
179 arm_dma_limit = 0xffffffff;
Russell King4dcfa602013-07-09 12:14:49 +0100180 arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT;
Marek Szyprowskic7909502011-12-29 13:09:51 +0100181#endif
182}
183
Santosh Shilimkar84f452b2013-06-30 00:28:46 -0400184static void __init zone_sizes_init(unsigned long min, unsigned long max_low,
Russell Kinga2c54d22010-10-27 19:17:31 +0100185 unsigned long max_high)
Russell Kingb7a69ac2008-10-01 16:58:32 +0100186{
187 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
Russell Kinga2c54d22010-10-27 19:17:31 +0100188 struct memblock_region *reg;
Russell Kingb7a69ac2008-10-01 16:58:32 +0100189
Russell King90072052005-10-28 14:48:37 +0100190 /*
Russell Kingbe370302010-05-07 17:40:33 +0100191 * initialise the zones.
Russell King90072052005-10-28 14:48:37 +0100192 */
193 memset(zone_size, 0, sizeof(zone_size));
Russell King90072052005-10-28 14:48:37 +0100194
195 /*
Russell Kingbe370302010-05-07 17:40:33 +0100196 * The memory size has already been determined. If we need
197 * to do anything fancy with the allocation of this memory
198 * to the zones, now is the time to do it.
Russell King90072052005-10-28 14:48:37 +0100199 */
Russell Kingdde58282009-08-15 12:36:00 +0100200 zone_size[0] = max_low - min;
201#ifdef CONFIG_HIGHMEM
202 zone_size[ZONE_HIGHMEM] = max_high - max_low;
203#endif
Russell King90072052005-10-28 14:48:37 +0100204
205 /*
Russell Kingbe370302010-05-07 17:40:33 +0100206 * Calculate the size of the holes.
207 * holes = node_size - sum(bank_sizes)
Russell King90072052005-10-28 14:48:37 +0100208 */
Russell Kingdde58282009-08-15 12:36:00 +0100209 memcpy(zhole_size, zone_size, sizeof(zhole_size));
Russell Kinga2c54d22010-10-27 19:17:31 +0100210 for_each_memblock(memory, reg) {
211 unsigned long start = memblock_region_memory_base_pfn(reg);
212 unsigned long end = memblock_region_memory_end_pfn(reg);
213
214 if (start < max_low) {
215 unsigned long low_end = min(end, max_low);
216 zhole_size[0] -= low_end - start;
217 }
Russell Kingdde58282009-08-15 12:36:00 +0100218#ifdef CONFIG_HIGHMEM
Russell Kinga2c54d22010-10-27 19:17:31 +0100219 if (end > max_low) {
220 unsigned long high_start = max(start, max_low);
221 zhole_size[ZONE_HIGHMEM] -= end - high_start;
222 }
Russell Kingdde58282009-08-15 12:36:00 +0100223#endif
Russell Kingdde58282009-08-15 12:36:00 +0100224 }
Russell King90072052005-10-28 14:48:37 +0100225
Nicolas Pitre65032012011-07-18 15:05:10 -0400226#ifdef CONFIG_ZONE_DMA
Russell King90072052005-10-28 14:48:37 +0100227 /*
228 * Adjust the sizes according to any special requirements for
229 * this machine type.
230 */
Marek Szyprowskic7909502011-12-29 13:09:51 +0100231 if (arm_dma_zone_size)
Nicolas Pitre65032012011-07-18 15:05:10 -0400232 arm_adjust_dma_zone(zone_size, zhole_size,
233 arm_dma_zone_size >> PAGE_SHIFT);
Russell Kingbe209022011-05-11 15:39:00 +0100234#endif
Russell King90072052005-10-28 14:48:37 +0100235
Russell Kingbe370302010-05-07 17:40:33 +0100236 free_area_init_node(0, zone_size, min, zhole_size);
Russell King90072052005-10-28 14:48:37 +0100237}
238
Will Deacon7b7bf492011-05-19 13:21:14 +0100239#ifdef CONFIG_HAVE_ARCH_PFN_VALID
Russell Kingb7cfda92009-09-07 15:06:42 +0100240int pfn_valid(unsigned long pfn)
241{
Mark Rutlandfb492c92011-08-30 17:45:10 +0100242 return memblock_is_memory(__pfn_to_phys(pfn));
Russell Kingb7cfda92009-09-07 15:06:42 +0100243}
244EXPORT_SYMBOL(pfn_valid);
Will Deacon7b7bf492011-05-19 13:21:14 +0100245#endif
Russell King657e12f2009-10-29 17:06:17 +0000246
Will Deacon7b7bf492011-05-19 13:21:14 +0100247#ifndef CONFIG_SPARSEMEM
Stephen Boyd14904922012-04-27 01:40:10 +0100248static void __init arm_memory_present(void)
Russell King657e12f2009-10-29 17:06:17 +0000249{
250}
251#else
Stephen Boyd14904922012-04-27 01:40:10 +0100252static void __init arm_memory_present(void)
Russell King657e12f2009-10-29 17:06:17 +0000253{
Benjamin Herrenschmidt719c15142010-08-05 12:55:55 +1000254 struct memblock_region *reg;
Benjamin Herrenschmidt719c15142010-08-05 12:55:55 +1000255
Yinghai Lu7c996362010-09-16 00:20:36 -0700256 for_each_memblock(memory, reg)
Yinghai Luc7fc2de2010-10-12 14:07:09 -0700257 memory_present(0, memblock_region_memory_base_pfn(reg),
258 memblock_region_memory_end_pfn(reg));
Russell King657e12f2009-10-29 17:06:17 +0000259}
Russell Kingb7cfda92009-09-07 15:06:42 +0100260#endif
261
Russell King716a3dc2012-01-13 15:00:51 +0000262static bool arm_memblock_steal_permitted = true;
263
Russell Kingbc2827d2012-01-19 14:35:19 +0000264phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
Russell King716a3dc2012-01-13 15:00:51 +0000265{
266 phys_addr_t phys;
267
268 BUG_ON(!arm_memblock_steal_permitted);
269
Russell King7ac68a42012-08-13 00:22:28 +0100270 phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
Russell King716a3dc2012-01-13 15:00:51 +0000271 memblock_free(phys, size);
272 memblock_remove(phys, size);
273
274 return phys;
275}
276
Russell Kingff69a4c2013-07-26 14:55:59 +0100277void __init arm_memblock_init(struct meminfo *mi,
278 const struct machine_desc *mdesc)
Russell King2778f622010-07-09 16:27:52 +0100279{
280 int i;
281
Russell King2778f622010-07-09 16:27:52 +0100282 for (i = 0; i < mi->nr_banks; i++)
283 memblock_add(mi->bank[i].start, mi->bank[i].size);
284
285 /* Register the kernel text, kernel data and initrd with memblock. */
286#ifdef CONFIG_XIP_KERNEL
Russell King842eab42010-10-01 14:12:22 +0100287 memblock_reserve(__pa(_sdata), _end - _sdata);
Russell King2778f622010-07-09 16:27:52 +0100288#else
289 memblock_reserve(__pa(_stext), _end - _stext);
290#endif
291#ifdef CONFIG_BLK_DEV_INITRD
Rob Herring65939302013-08-30 10:54:26 -0500292 /* FDT scan will populate initrd_start */
Ben Peddell4c235cb2014-01-13 23:25:18 +0100293 if (initrd_start && !phys_initrd_size) {
Rob Herring65939302013-08-30 10:54:26 -0500294 phys_initrd_start = __virt_to_phys(initrd_start);
295 phys_initrd_size = initrd_end - initrd_start;
296 }
Ben Peddell4c235cb2014-01-13 23:25:18 +0100297 initrd_start = initrd_end = 0;
Russell Kingb0a26792011-01-30 11:21:05 +0000298 if (phys_initrd_size &&
Russell King8f4b8c72011-06-11 00:43:21 +0100299 !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) {
Vitaly Andrianovde22cc62012-06-22 14:26:04 -0400300 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n",
301 (u64)phys_initrd_start, phys_initrd_size);
Russell King8f4b8c72011-06-11 00:43:21 +0100302 phys_initrd_start = phys_initrd_size = 0;
303 }
304 if (phys_initrd_size &&
Russell Kingb0a26792011-01-30 11:21:05 +0000305 memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) {
Vitaly Andrianovde22cc62012-06-22 14:26:04 -0400306 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n",
307 (u64)phys_initrd_start, phys_initrd_size);
Russell Kingb0a26792011-01-30 11:21:05 +0000308 phys_initrd_start = phys_initrd_size = 0;
309 }
Russell King2778f622010-07-09 16:27:52 +0100310 if (phys_initrd_size) {
311 memblock_reserve(phys_initrd_start, phys_initrd_size);
312
313 /* Now convert initrd to virtual addresses */
314 initrd_start = __phys_to_virt(phys_initrd_start);
315 initrd_end = initrd_start + phys_initrd_size;
316 }
317#endif
318
319 arm_mm_memblock_reserve();
Grant Likely93c02ab2011-04-28 14:27:21 -0600320 arm_dt_memblock_reserve();
Russell King2778f622010-07-09 16:27:52 +0100321
Russell King8d717a52010-05-22 19:47:18 +0100322 /* reserve any platform specific memblock areas */
323 if (mdesc->reserve)
324 mdesc->reserve();
325
Marek Szyprowskibcedb5f2014-02-28 14:42:54 +0100326 early_init_fdt_scan_reserved_mem();
327
Marek Szyprowskic7909502011-12-29 13:09:51 +0100328 /*
329 * reserve memory for DMA contigouos allocations,
330 * must come from DMA area inside low memory
331 */
332 dma_contiguous_reserve(min(arm_dma_limit, arm_lowmem_limit));
333
Russell King716a3dc2012-01-13 15:00:51 +0000334 arm_memblock_steal_permitted = false;
Russell King2778f622010-07-09 16:27:52 +0100335 memblock_dump_all();
336}
337
Russell King8d717a52010-05-22 19:47:18 +0100338void __init bootmem_init(void)
Russell King90072052005-10-28 14:48:37 +0100339{
Russell Kingdde58282009-08-15 12:36:00 +0100340 unsigned long min, max_low, max_high;
Russell King90072052005-10-28 14:48:37 +0100341
Grygorii Strashko8e58cae2013-11-23 14:42:18 -0500342 memblock_allow_resize();
Russell Kingdde58282009-08-15 12:36:00 +0100343 max_low = max_high = 0;
344
Russell Kingf25b4b42010-10-27 19:49:33 +0100345 find_limits(&min, &max_low, &max_high);
Russell Kingbe370302010-05-07 17:40:33 +0100346
Russell Kingbe370302010-05-07 17:40:33 +0100347 /*
Russell Kingbe370302010-05-07 17:40:33 +0100348 * Sparsemem tries to allocate bootmem in memory_present(),
349 * so must be done after the fixed reservations
350 */
Russell Kingeda2e5d2010-07-01 12:00:57 +0100351 arm_memory_present();
Russell King90072052005-10-28 14:48:37 +0100352
Russell Kingb7a69ac2008-10-01 16:58:32 +0100353 /*
354 * sparse_init() needs the bootmem allocator up and running.
355 */
356 sparse_init();
357
358 /*
Russell Kingbe370302010-05-07 17:40:33 +0100359 * Now free the memory - free_area_init_node needs
Russell Kingb7a69ac2008-10-01 16:58:32 +0100360 * the sparse mem_map arrays initialized by sparse_init()
361 * for memmap_init_zone(), otherwise all PFNs are invalid.
362 */
Santosh Shilimkar84f452b2013-06-30 00:28:46 -0400363 zone_sizes_init(min, max_low, max_high);
Russell Kingb7a69ac2008-10-01 16:58:32 +0100364
Russell King90072052005-10-28 14:48:37 +0100365 /*
366 * This doesn't seem to be used by the Linux memory manager any
367 * more, but is used by ll_rw_block. If we can get rid of it, we
368 * also get rid of some of the stuff above as well.
Russell King90072052005-10-28 14:48:37 +0100369 */
Santosh Shilimkar26ba47b2013-08-01 03:12:01 +0100370 min_low_pfn = min;
371 max_low_pfn = max_low;
372 max_pfn = max_high;
Russell King90072052005-10-28 14:48:37 +0100373}
374
Stephen Boyd54d52572011-07-07 18:43:36 +0100375/*
376 * Poison init memory with an undefined instruction (ARM) or a branch to an
377 * undefined instruction (Thumb).
378 */
379static inline void poison_init_mem(void *s, size_t count)
380{
381 u32 *p = (u32 *)s;
Jamie Ilesbf912d92011-08-04 09:39:31 +0100382 for (; count != 0; count -= 4)
Stephen Boyd54d52572011-07-07 18:43:36 +0100383 *p++ = 0xe7fddef0;
384}
385
Russell Kinga0130532005-06-27 14:16:47 +0100386static inline void
Russell Kingbe370302010-05-07 17:40:33 +0100387free_memmap(unsigned long start_pfn, unsigned long end_pfn)
Russell Kinga0130532005-06-27 14:16:47 +0100388{
389 struct page *start_pg, *end_pg;
Vitaly Andrianov56bc6282012-06-21 08:09:05 -0400390 phys_addr_t pg, pgend;
Russell Kinga0130532005-06-27 14:16:47 +0100391
392 /*
393 * Convert start_pfn/end_pfn to a struct page pointer.
394 */
Catalin Marinas3257f432009-10-06 17:57:22 +0100395 start_pg = pfn_to_page(start_pfn - 1) + 1;
Will Deacon9af386c2011-04-28 18:44:31 +0100396 end_pg = pfn_to_page(end_pfn - 1) + 1;
Russell Kinga0130532005-06-27 14:16:47 +0100397
398 /*
399 * Convert to physical addresses, and
400 * round start upwards and end downwards.
401 */
Vitaly Andrianov56bc6282012-06-21 08:09:05 -0400402 pg = PAGE_ALIGN(__pa(start_pg));
403 pgend = __pa(end_pg) & PAGE_MASK;
Russell Kinga0130532005-06-27 14:16:47 +0100404
405 /*
406 * If there are free pages between these,
407 * free the section of the memmap array.
408 */
409 if (pg < pgend)
Santosh Shilimkarcfb665862014-01-21 15:50:49 -0800410 memblock_free_early(pg, pgend - pg);
Russell Kinga0130532005-06-27 14:16:47 +0100411}
412
413/*
414 * The mem_map array can get very big. Free the unused area of the memory map.
415 */
Russell Kingbe370302010-05-07 17:40:33 +0100416static void __init free_unused_memmap(struct meminfo *mi)
Russell Kinga0130532005-06-27 14:16:47 +0100417{
418 unsigned long bank_start, prev_bank_end = 0;
419 unsigned int i;
420
421 /*
Michael Bohan3260e522010-06-14 13:06:56 -0700422 * This relies on each bank being in address order.
423 * The banks are sorted previously in bootmem_init().
Russell Kinga0130532005-06-27 14:16:47 +0100424 */
Russell Kingbe370302010-05-07 17:40:33 +0100425 for_each_bank(i, mi) {
Russell Kingd2a38ef2008-10-01 16:56:15 +0100426 struct membank *bank = &mi->bank[i];
427
428 bank_start = bank_pfn_start(bank);
Russell Kinga0130532005-06-27 14:16:47 +0100429
Will Deacon9af386c2011-04-28 18:44:31 +0100430#ifdef CONFIG_SPARSEMEM
431 /*
432 * Take care not to free memmap entries that don't exist
433 * due to SPARSEMEM sections which aren't present.
434 */
435 bank_start = min(bank_start,
436 ALIGN(prev_bank_end, PAGES_PER_SECTION));
Linus Walleij002ea9eef2011-09-29 09:37:23 +0100437#else
438 /*
439 * Align down here since the VM subsystem insists that the
440 * memmap entries are valid from the bank start aligned to
441 * MAX_ORDER_NR_PAGES.
442 */
443 bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
Will Deacon9af386c2011-04-28 18:44:31 +0100444#endif
Russell Kinga0130532005-06-27 14:16:47 +0100445 /*
446 * If we had a previous bank, and there is a space
447 * between the current bank and the previous, free it.
448 */
Michael Bohan3260e522010-06-14 13:06:56 -0700449 if (prev_bank_end && prev_bank_end < bank_start)
Russell Kingbe370302010-05-07 17:40:33 +0100450 free_memmap(prev_bank_end, bank_start);
Russell Kinga0130532005-06-27 14:16:47 +0100451
Michael Bohan3260e522010-06-14 13:06:56 -0700452 /*
453 * Align up here since the VM subsystem insists that the
454 * memmap entries are valid from the bank end aligned to
455 * MAX_ORDER_NR_PAGES.
456 */
457 prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
Russell Kinga0130532005-06-27 14:16:47 +0100458 }
Will Deacon9af386c2011-04-28 18:44:31 +0100459
460#ifdef CONFIG_SPARSEMEM
461 if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
462 free_memmap(prev_bank_end,
463 ALIGN(prev_bank_end, PAGES_PER_SECTION));
464#endif
Russell Kinga0130532005-06-27 14:16:47 +0100465}
466
Jiang Liu83db0382013-04-29 15:06:26 -0700467#ifdef CONFIG_HIGHMEM
468static inline void free_area_high(unsigned long pfn, unsigned long end)
469{
Jiang Liudd6911e2013-04-29 15:07:03 -0700470 for (; pfn < end; pfn++)
471 free_highmem_page(pfn_to_page(pfn));
Jiang Liu83db0382013-04-29 15:06:26 -0700472}
473#endif
474
Russell Kingd0e775a2010-10-27 19:37:06 +0100475static void __init free_highpages(void)
476{
477#ifdef CONFIG_HIGHMEM
Santosh Shilimkar26ba47b2013-08-01 03:12:01 +0100478 unsigned long max_low = max_low_pfn;
Russell Kingdf4f14c2010-10-27 19:45:49 +0100479 struct memblock_region *mem, *res;
Russell Kingd0e775a2010-10-27 19:37:06 +0100480
481 /* set highmem page free */
Russell Kingdf4f14c2010-10-27 19:45:49 +0100482 for_each_memblock(memory, mem) {
483 unsigned long start = memblock_region_memory_base_pfn(mem);
484 unsigned long end = memblock_region_memory_end_pfn(mem);
485
486 /* Ignore complete lowmem entries */
487 if (end <= max_low)
488 continue;
489
490 /* Truncate partial highmem entries */
491 if (start < max_low)
492 start = max_low;
493
494 /* Find and exclude any reserved regions */
495 for_each_memblock(reserved, res) {
496 unsigned long res_start, res_end;
497
498 res_start = memblock_region_reserved_base_pfn(res);
499 res_end = memblock_region_reserved_end_pfn(res);
500
501 if (res_end < start)
502 continue;
503 if (res_start < start)
504 res_start = start;
505 if (res_start > end)
506 res_start = end;
507 if (res_end > end)
508 res_end = end;
509 if (res_start != start)
Jiang Liu83db0382013-04-29 15:06:26 -0700510 free_area_high(start, res_start);
Russell Kingdf4f14c2010-10-27 19:45:49 +0100511 start = res_end;
512 if (start == end)
513 break;
514 }
515
516 /* And now free anything which remains */
517 if (start < end)
Jiang Liu83db0382013-04-29 15:06:26 -0700518 free_area_high(start, end);
Russell Kingd0e775a2010-10-27 19:37:06 +0100519 }
Russell Kingd0e775a2010-10-27 19:37:06 +0100520#endif
521}
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523/*
524 * mem_init() marks the free areas in the mem_map and tells us how much
525 * memory is free. This is done after various parts of the system have
526 * claimed their memory after the kernel image.
527 */
528void __init mem_init(void)
529{
Linus Walleij1dbd30e2010-07-12 21:53:28 +0100530#ifdef CONFIG_HAVE_TCM
531 /* These pointers are filled in on TCM detection */
532 extern u32 dtcm_end;
533 extern u32 itcm_end;
534#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Santosh Shilimkarb3ba41f2013-11-23 14:36:42 -0500536 set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 /* this will put all unused low memory onto the freelists */
Russell Kingbe370302010-05-07 17:40:33 +0100539 free_unused_memmap(&meminfo);
Jiang Liu0c988532013-07-03 15:03:24 -0700540 free_all_bootmem();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542#ifdef CONFIG_SA1111
543 /* now that our DMA memory is actually so designated, we can free it */
Linus Torvaldsbfd65dd2013-07-13 14:58:36 -0700544 free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545#endif
546
Russell Kingd0e775a2010-10-27 19:37:06 +0100547 free_highpages();
Nicolas Pitre3835f6c2008-09-17 15:21:55 -0400548
Jiang Liu2450c972013-07-03 15:03:48 -0700549 mem_init_print_info(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100551#define MLK(b, t) b, t, ((t) - (b)) >> 10
552#define MLM(b, t) b, t, ((t) - (b)) >> 20
553#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
554
555 printk(KERN_NOTICE "Virtual kernel memory layout:\n"
556 " vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100557#ifdef CONFIG_HAVE_TCM
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100558 " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100559 " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n"
560#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100561 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
562 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
563 " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
564#ifdef CONFIG_HIGHMEM
565 " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n"
566#endif
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100567#ifdef CONFIG_MODULES
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100568 " modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100569#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100570 " .text : 0x%p" " - 0x%p" " (%4d kB)\n"
Russell King3835d692011-07-06 10:39:34 +0100571 " .init : 0x%p" " - 0x%p" " (%4d kB)\n"
Rabin Vincent45f6d7e2011-06-02 15:01:36 +0100572 " .data : 0x%p" " - 0x%p" " (%4d kB)\n"
573 " .bss : 0x%p" " - 0x%p" " (%4d kB)\n",
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100574
575 MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) +
576 (PAGE_SIZE)),
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100577#ifdef CONFIG_HAVE_TCM
Linus Walleij1dbd30e2010-07-12 21:53:28 +0100578 MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
579 MLK(ITCM_OFFSET, (unsigned long) itcm_end),
Linus Walleij07d2a5c2010-07-12 21:52:34 +0100580#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100581 MLK(FIXADDR_START, FIXADDR_TOP),
Fenkart/Bostandzhyanc931b4f2010-02-07 21:47:17 +0100582 MLM(VMALLOC_START, VMALLOC_END),
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100583 MLM(PAGE_OFFSET, (unsigned long)high_memory),
584#ifdef CONFIG_HIGHMEM
585 MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) *
586 (PAGE_SIZE)),
587#endif
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100588#ifdef CONFIG_MODULES
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100589 MLM(MODULES_VADDR, MODULES_END),
Uwe Kleine-Königd9277d52012-02-01 11:16:51 +0100590#endif
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100591
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100592 MLK_ROUNDUP(_text, _etext),
Russell King3835d692011-07-06 10:39:34 +0100593 MLK_ROUNDUP(__init_begin, __init_end),
Rabin Vincent45f6d7e2011-06-02 15:01:36 +0100594 MLK_ROUNDUP(_sdata, _edata),
595 MLK_ROUNDUP(__bss_start, __bss_stop));
Fenkart/Bostandzhyandb9ef1a2010-02-07 21:45:47 +0100596
597#undef MLK
598#undef MLM
599#undef MLK_ROUNDUP
600
Fenkart/Bostandzhyana1839272010-02-07 21:47:58 +0100601 /*
602 * Check boundaries twice: Some fundamental inconsistencies can
603 * be detected at build time already.
604 */
605#ifdef CONFIG_MMU
Fenkart/Bostandzhyana1839272010-02-07 21:47:58 +0100606 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
607 BUG_ON(TASK_SIZE > MODULES_VADDR);
608#endif
609
610#ifdef CONFIG_HIGHMEM
611 BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
612 BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
613#endif
614
Jiang Liu2450c972013-07-03 15:03:48 -0700615 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 extern int sysctl_overcommit_memory;
617 /*
618 * On a machine this small we won't get
619 * anywhere without overcommit, so turn
620 * it on by default.
621 */
622 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
623 }
624}
625
626void free_initmem(void)
627{
Linus Walleijbc581772009-09-15 17:30:37 +0100628#ifdef CONFIG_HAVE_TCM
Linus Walleijea208f62010-05-26 07:37:57 +0100629 extern char __tcm_start, __tcm_end;
Linus Walleijbc581772009-09-15 17:30:37 +0100630
Stephen Boyd54d52572011-07-07 18:43:36 +0100631 poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start);
Jiang Liudbe67df2013-07-03 15:02:51 -0700632 free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link");
Linus Walleijbc581772009-09-15 17:30:37 +0100633#endif
634
Stephen Boyd54d52572011-07-07 18:43:36 +0100635 poison_init_mem(__init_begin, __init_end - __init_begin);
Nicolas Pitre6db015e2008-09-17 14:50:42 -0400636 if (!machine_is_integrator() && !machine_is_cintegrator())
Jiang Liudbe67df2013-07-03 15:02:51 -0700637 free_initmem_default(-1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
640#ifdef CONFIG_BLK_DEV_INITRD
641
642static int keep_initrd;
643
644void free_initrd_mem(unsigned long start, unsigned long end)
645{
Stephen Boyd54d52572011-07-07 18:43:36 +0100646 if (!keep_initrd) {
647 poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
Jiang Liudbe67df2013-07-03 15:02:51 -0700648 free_reserved_area((void *)start, (void *)end, -1, "initrd");
Stephen Boyd54d52572011-07-07 18:43:36 +0100649 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
652static int __init keepinitrd_setup(char *__unused)
653{
654 keep_initrd = 1;
655 return 1;
656}
657
658__setup("keepinitrd", keepinitrd_setup);
659#endif