Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mm/init.c |
| 3 | * |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 4 | * Copyright (C) 1995-2005 Russell King |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/kernel.h> |
| 11 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/swap.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/bootmem.h> |
| 15 | #include <linux/mman.h> |
Paul Gortmaker | dc28094 | 2011-07-31 16:17:29 -0400 | [diff] [blame] | 16 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/nodemask.h> |
| 18 | #include <linux/initrd.h> |
Grant Likely | 9eb8f67 | 2011-04-28 14:27:20 -0600 | [diff] [blame] | 19 | #include <linux/of_fdt.h> |
Nicolas Pitre | 3835f6c | 2008-09-17 15:21:55 -0400 | [diff] [blame] | 20 | #include <linux/highmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/gfp.h> |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 22 | #include <linux/memblock.h> |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 23 | #include <linux/dma-contiguous.h> |
Alessandro Rubini | 158e8bf | 2012-06-24 12:46:26 +0100 | [diff] [blame] | 24 | #include <linux/sizes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Russell King | b4b20ad | 2014-04-13 18:57:29 +0100 | [diff] [blame] | 26 | #include <asm/cp15.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <asm/mach-types.h> |
Russell King | 716a3dc | 2012-01-13 15:00:51 +0000 | [diff] [blame] | 28 | #include <asm/memblock.h> |
Grant Likely | 93c02ab | 2011-04-28 14:27:21 -0600 | [diff] [blame] | 29 | #include <asm/prom.h> |
Russell King | 37efe64 | 2008-12-01 11:53:07 +0000 | [diff] [blame] | 30 | #include <asm/sections.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <asm/setup.h> |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 32 | #include <asm/system_info.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/tlb.h> |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 34 | #include <asm/fixmap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
| 36 | #include <asm/mach/arch.h> |
| 37 | #include <asm/mach/map.h> |
| 38 | |
Russell King | 1b2e2b7 | 2006-08-21 17:06:38 +0100 | [diff] [blame] | 39 | #include "mm.h" |
| 40 | |
Russell King | b4b20ad | 2014-04-13 18:57:29 +0100 | [diff] [blame] | 41 | #ifdef CONFIG_CPU_CP15_MMU |
| 42 | unsigned long __init __clear_cr(unsigned long mask) |
| 43 | { |
Russell King | b4b20ad | 2014-04-13 18:57:29 +0100 | [diff] [blame] | 44 | cr_alignment = cr_alignment & ~mask; |
| 45 | return cr_alignment; |
| 46 | } |
| 47 | #endif |
| 48 | |
Vitaly Andrianov | de22cc6 | 2012-06-22 14:26:04 -0400 | [diff] [blame] | 49 | static phys_addr_t phys_initrd_start __initdata = 0; |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 50 | static unsigned long phys_initrd_size __initdata = 0; |
| 51 | |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 52 | static int __init early_initrd(char *p) |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 53 | { |
Vitaly Andrianov | de22cc6 | 2012-06-22 14:26:04 -0400 | [diff] [blame] | 54 | phys_addr_t start; |
| 55 | unsigned long size; |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 56 | char *endp; |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 57 | |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 58 | start = memparse(p, &endp); |
| 59 | if (*endp == ',') { |
| 60 | size = memparse(endp + 1, NULL); |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 61 | |
| 62 | phys_initrd_start = start; |
| 63 | phys_initrd_size = size; |
| 64 | } |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 65 | return 0; |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 66 | } |
Jeremy Kerr | 2b0d8c2 | 2010-01-11 23:17:34 +0100 | [diff] [blame] | 67 | early_param("initrd", early_initrd); |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 68 | |
| 69 | static int __init parse_tag_initrd(const struct tag *tag) |
| 70 | { |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 71 | pr_warn("ATAG_INITRD is deprecated; " |
Russell King | 012d1f4 | 2008-09-06 10:57:03 +0100 | [diff] [blame] | 72 | "please update your bootloader.\n"); |
| 73 | phys_initrd_start = __virt_to_phys(tag->u.initrd.start); |
| 74 | phys_initrd_size = tag->u.initrd.size; |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | __tagtable(ATAG_INITRD, parse_tag_initrd); |
| 79 | |
| 80 | static int __init parse_tag_initrd2(const struct tag *tag) |
| 81 | { |
| 82 | phys_initrd_start = tag->u.initrd.start; |
| 83 | phys_initrd_size = tag->u.initrd.size; |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | __tagtable(ATAG_INITRD2, parse_tag_initrd2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | /* |
Nicolas Pitre | 4b5f32c | 2008-10-06 13:24:40 -0400 | [diff] [blame] | 90 | * This keeps memory configuration data used by a couple memory |
| 91 | * initialization functions, as well as show_mem() for the skipping |
| 92 | * of holes in the memory map. It is populated by arm_add_memory(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | */ |
David Rientjes | b2b755b | 2011-03-24 15:18:15 -0700 | [diff] [blame] | 94 | void show_mem(unsigned int filter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
| 96 | int free = 0, total = 0, reserved = 0; |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 97 | int shared = 0, cached = 0, slab = 0; |
| 98 | struct memblock_region *reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | printk("Mem-info:\n"); |
David Rientjes | 7bf02ea | 2011-05-24 17:11:16 -0700 | [diff] [blame] | 101 | show_free_areas(filter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 103 | for_each_memblock (memory, reg) { |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 104 | unsigned int pfn1, pfn2; |
| 105 | struct page *page, *end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 107 | pfn1 = memblock_region_memory_base_pfn(reg); |
| 108 | pfn2 = memblock_region_memory_end_pfn(reg); |
Ray Lehtiniemi | 5e70982 | 2006-11-07 03:19:15 +0100 | [diff] [blame] | 109 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 110 | page = pfn_to_page(pfn1); |
| 111 | end = pfn_to_page(pfn2 - 1) + 1; |
| 112 | |
| 113 | do { |
| 114 | total++; |
| 115 | if (PageReserved(page)) |
| 116 | reserved++; |
| 117 | else if (PageSwapCache(page)) |
| 118 | cached++; |
| 119 | else if (PageSlab(page)) |
| 120 | slab++; |
| 121 | else if (!page_count(page)) |
| 122 | free++; |
| 123 | else |
| 124 | shared += page_count(page) - 1; |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 125 | pfn1++; |
| 126 | page = pfn_to_page(pfn1); |
| 127 | } while (pfn1 < pfn2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | printk("%d pages of RAM\n", total); |
| 131 | printk("%d free pages\n", free); |
| 132 | printk("%d reserved pages\n", reserved); |
| 133 | printk("%d slab pages\n", slab); |
| 134 | printk("%d pages shared\n", shared); |
| 135 | printk("%d pages swap cached\n", cached); |
| 136 | } |
| 137 | |
Russell King | f25b4b4 | 2010-10-27 19:49:33 +0100 | [diff] [blame] | 138 | static void __init find_limits(unsigned long *min, unsigned long *max_low, |
Nicolas Pitre | 27a3f0e | 2011-08-25 19:10:29 -0400 | [diff] [blame] | 139 | unsigned long *max_high) |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 140 | { |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 141 | *max_low = PFN_DOWN(memblock_get_current_limit()); |
| 142 | *min = PFN_UP(memblock_start_of_DRAM()); |
| 143 | *max_high = PFN_DOWN(memblock_end_of_DRAM()); |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 144 | } |
| 145 | |
Russell King | be20902 | 2011-05-11 15:39:00 +0100 | [diff] [blame] | 146 | #ifdef CONFIG_ZONE_DMA |
Nicolas Pitre | 6503201 | 2011-07-18 15:05:10 -0400 | [diff] [blame] | 147 | |
Rob Herring | 364230b | 2013-08-01 15:29:29 -0500 | [diff] [blame] | 148 | phys_addr_t arm_dma_zone_size __read_mostly; |
Nicolas Pitre | 6503201 | 2011-07-18 15:05:10 -0400 | [diff] [blame] | 149 | EXPORT_SYMBOL(arm_dma_zone_size); |
| 150 | |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 151 | /* |
| 152 | * The DMA mask corresponding to the maximum bus address allocatable |
| 153 | * using GFP_DMA. The default here places no restriction on DMA |
| 154 | * allocations. This must be the smallest DMA mask in the system, |
| 155 | * so a successful GFP_DMA allocation will always satisfy this. |
| 156 | */ |
Marek Szyprowski | 4986e5c | 2012-06-06 12:05:01 +0200 | [diff] [blame] | 157 | phys_addr_t arm_dma_limit; |
Russell King | 4dcfa60 | 2013-07-09 12:14:49 +0100 | [diff] [blame] | 158 | unsigned long arm_dma_pfn_limit; |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 159 | |
Russell King | be20902 | 2011-05-11 15:39:00 +0100 | [diff] [blame] | 160 | static void __init arm_adjust_dma_zone(unsigned long *size, unsigned long *hole, |
| 161 | unsigned long dma_size) |
| 162 | { |
| 163 | if (size[0] <= dma_size) |
| 164 | return; |
| 165 | |
| 166 | size[ZONE_NORMAL] = size[0] - dma_size; |
| 167 | size[ZONE_DMA] = dma_size; |
| 168 | hole[ZONE_NORMAL] = hole[0]; |
| 169 | hole[ZONE_DMA] = 0; |
| 170 | } |
| 171 | #endif |
| 172 | |
Russell King | ff69a4c | 2013-07-26 14:55:59 +0100 | [diff] [blame] | 173 | void __init setup_dma_zone(const struct machine_desc *mdesc) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 174 | { |
| 175 | #ifdef CONFIG_ZONE_DMA |
| 176 | if (mdesc->dma_zone_size) { |
| 177 | arm_dma_zone_size = mdesc->dma_zone_size; |
Russell King | 6bcac80 | 2014-01-07 17:53:54 +0000 | [diff] [blame] | 178 | arm_dma_limit = PHYS_OFFSET + arm_dma_zone_size - 1; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 179 | } else |
| 180 | arm_dma_limit = 0xffffffff; |
Russell King | 4dcfa60 | 2013-07-09 12:14:49 +0100 | [diff] [blame] | 181 | arm_dma_pfn_limit = arm_dma_limit >> PAGE_SHIFT; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 182 | #endif |
| 183 | } |
| 184 | |
Santosh Shilimkar | 84f452b | 2013-06-30 00:28:46 -0400 | [diff] [blame] | 185 | static void __init zone_sizes_init(unsigned long min, unsigned long max_low, |
Russell King | a2c54d2 | 2010-10-27 19:17:31 +0100 | [diff] [blame] | 186 | unsigned long max_high) |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 187 | { |
| 188 | unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; |
Russell King | a2c54d2 | 2010-10-27 19:17:31 +0100 | [diff] [blame] | 189 | struct memblock_region *reg; |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 190 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 191 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 192 | * initialise the zones. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 193 | */ |
| 194 | memset(zone_size, 0, sizeof(zone_size)); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 195 | |
| 196 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 197 | * The memory size has already been determined. If we need |
| 198 | * to do anything fancy with the allocation of this memory |
| 199 | * to the zones, now is the time to do it. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 200 | */ |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 201 | zone_size[0] = max_low - min; |
| 202 | #ifdef CONFIG_HIGHMEM |
| 203 | zone_size[ZONE_HIGHMEM] = max_high - max_low; |
| 204 | #endif |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 205 | |
| 206 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 207 | * Calculate the size of the holes. |
| 208 | * holes = node_size - sum(bank_sizes) |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 209 | */ |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 210 | memcpy(zhole_size, zone_size, sizeof(zhole_size)); |
Russell King | a2c54d2 | 2010-10-27 19:17:31 +0100 | [diff] [blame] | 211 | for_each_memblock(memory, reg) { |
| 212 | unsigned long start = memblock_region_memory_base_pfn(reg); |
| 213 | unsigned long end = memblock_region_memory_end_pfn(reg); |
| 214 | |
| 215 | if (start < max_low) { |
| 216 | unsigned long low_end = min(end, max_low); |
| 217 | zhole_size[0] -= low_end - start; |
| 218 | } |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 219 | #ifdef CONFIG_HIGHMEM |
Russell King | a2c54d2 | 2010-10-27 19:17:31 +0100 | [diff] [blame] | 220 | if (end > max_low) { |
| 221 | unsigned long high_start = max(start, max_low); |
| 222 | zhole_size[ZONE_HIGHMEM] -= end - high_start; |
| 223 | } |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 224 | #endif |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 225 | } |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 226 | |
Nicolas Pitre | 6503201 | 2011-07-18 15:05:10 -0400 | [diff] [blame] | 227 | #ifdef CONFIG_ZONE_DMA |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 228 | /* |
| 229 | * Adjust the sizes according to any special requirements for |
| 230 | * this machine type. |
| 231 | */ |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 232 | if (arm_dma_zone_size) |
Nicolas Pitre | 6503201 | 2011-07-18 15:05:10 -0400 | [diff] [blame] | 233 | arm_adjust_dma_zone(zone_size, zhole_size, |
| 234 | arm_dma_zone_size >> PAGE_SHIFT); |
Russell King | be20902 | 2011-05-11 15:39:00 +0100 | [diff] [blame] | 235 | #endif |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 236 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 237 | free_area_init_node(0, zone_size, min, zhole_size); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 238 | } |
| 239 | |
Will Deacon | 7b7bf49 | 2011-05-19 13:21:14 +0100 | [diff] [blame] | 240 | #ifdef CONFIG_HAVE_ARCH_PFN_VALID |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 241 | int pfn_valid(unsigned long pfn) |
| 242 | { |
Mark Rutland | fb492c9 | 2011-08-30 17:45:10 +0100 | [diff] [blame] | 243 | return memblock_is_memory(__pfn_to_phys(pfn)); |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 244 | } |
| 245 | EXPORT_SYMBOL(pfn_valid); |
Will Deacon | 7b7bf49 | 2011-05-19 13:21:14 +0100 | [diff] [blame] | 246 | #endif |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 247 | |
Will Deacon | 7b7bf49 | 2011-05-19 13:21:14 +0100 | [diff] [blame] | 248 | #ifndef CONFIG_SPARSEMEM |
Stephen Boyd | 1490492 | 2012-04-27 01:40:10 +0100 | [diff] [blame] | 249 | static void __init arm_memory_present(void) |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 250 | { |
| 251 | } |
| 252 | #else |
Stephen Boyd | 1490492 | 2012-04-27 01:40:10 +0100 | [diff] [blame] | 253 | static void __init arm_memory_present(void) |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 254 | { |
Benjamin Herrenschmidt | 719c1514 | 2010-08-05 12:55:55 +1000 | [diff] [blame] | 255 | struct memblock_region *reg; |
Benjamin Herrenschmidt | 719c1514 | 2010-08-05 12:55:55 +1000 | [diff] [blame] | 256 | |
Yinghai Lu | 7c99636 | 2010-09-16 00:20:36 -0700 | [diff] [blame] | 257 | for_each_memblock(memory, reg) |
Yinghai Lu | c7fc2de | 2010-10-12 14:07:09 -0700 | [diff] [blame] | 258 | memory_present(0, memblock_region_memory_base_pfn(reg), |
| 259 | memblock_region_memory_end_pfn(reg)); |
Russell King | 657e12f | 2009-10-29 17:06:17 +0000 | [diff] [blame] | 260 | } |
Russell King | b7cfda9 | 2009-09-07 15:06:42 +0100 | [diff] [blame] | 261 | #endif |
| 262 | |
Russell King | 716a3dc | 2012-01-13 15:00:51 +0000 | [diff] [blame] | 263 | static bool arm_memblock_steal_permitted = true; |
| 264 | |
Russell King | bc2827d | 2012-01-19 14:35:19 +0000 | [diff] [blame] | 265 | phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align) |
Russell King | 716a3dc | 2012-01-13 15:00:51 +0000 | [diff] [blame] | 266 | { |
| 267 | phys_addr_t phys; |
| 268 | |
| 269 | BUG_ON(!arm_memblock_steal_permitted); |
| 270 | |
Russell King | 7ac68a4 | 2012-08-13 00:22:28 +0100 | [diff] [blame] | 271 | phys = memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE); |
Russell King | 716a3dc | 2012-01-13 15:00:51 +0000 | [diff] [blame] | 272 | memblock_free(phys, size); |
| 273 | memblock_remove(phys, size); |
| 274 | |
| 275 | return phys; |
| 276 | } |
| 277 | |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 278 | void __init arm_memblock_init(const struct machine_desc *mdesc) |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 279 | { |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 280 | /* Register the kernel text, kernel data and initrd with memblock. */ |
| 281 | #ifdef CONFIG_XIP_KERNEL |
Russell King | 842eab4 | 2010-10-01 14:12:22 +0100 | [diff] [blame] | 282 | memblock_reserve(__pa(_sdata), _end - _sdata); |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 283 | #else |
| 284 | memblock_reserve(__pa(_stext), _end - _stext); |
| 285 | #endif |
| 286 | #ifdef CONFIG_BLK_DEV_INITRD |
Rob Herring | 6593930 | 2013-08-30 10:54:26 -0500 | [diff] [blame] | 287 | /* FDT scan will populate initrd_start */ |
Ben Peddell | 4c235cb | 2014-01-13 23:25:18 +0100 | [diff] [blame] | 288 | if (initrd_start && !phys_initrd_size) { |
Rob Herring | 6593930 | 2013-08-30 10:54:26 -0500 | [diff] [blame] | 289 | phys_initrd_start = __virt_to_phys(initrd_start); |
| 290 | phys_initrd_size = initrd_end - initrd_start; |
| 291 | } |
Ben Peddell | 4c235cb | 2014-01-13 23:25:18 +0100 | [diff] [blame] | 292 | initrd_start = initrd_end = 0; |
Russell King | b0a2679 | 2011-01-30 11:21:05 +0000 | [diff] [blame] | 293 | if (phys_initrd_size && |
Russell King | 8f4b8c7 | 2011-06-11 00:43:21 +0100 | [diff] [blame] | 294 | !memblock_is_region_memory(phys_initrd_start, phys_initrd_size)) { |
Vitaly Andrianov | de22cc6 | 2012-06-22 14:26:04 -0400 | [diff] [blame] | 295 | pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region - disabling initrd\n", |
| 296 | (u64)phys_initrd_start, phys_initrd_size); |
Russell King | 8f4b8c7 | 2011-06-11 00:43:21 +0100 | [diff] [blame] | 297 | phys_initrd_start = phys_initrd_size = 0; |
| 298 | } |
| 299 | if (phys_initrd_size && |
Russell King | b0a2679 | 2011-01-30 11:21:05 +0000 | [diff] [blame] | 300 | memblock_is_region_reserved(phys_initrd_start, phys_initrd_size)) { |
Vitaly Andrianov | de22cc6 | 2012-06-22 14:26:04 -0400 | [diff] [blame] | 301 | pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region - disabling initrd\n", |
| 302 | (u64)phys_initrd_start, phys_initrd_size); |
Russell King | b0a2679 | 2011-01-30 11:21:05 +0000 | [diff] [blame] | 303 | phys_initrd_start = phys_initrd_size = 0; |
| 304 | } |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 305 | if (phys_initrd_size) { |
| 306 | memblock_reserve(phys_initrd_start, phys_initrd_size); |
| 307 | |
| 308 | /* Now convert initrd to virtual addresses */ |
| 309 | initrd_start = __phys_to_virt(phys_initrd_start); |
| 310 | initrd_end = initrd_start + phys_initrd_size; |
| 311 | } |
| 312 | #endif |
| 313 | |
| 314 | arm_mm_memblock_reserve(); |
| 315 | |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 316 | /* reserve any platform specific memblock areas */ |
| 317 | if (mdesc->reserve) |
| 318 | mdesc->reserve(); |
| 319 | |
Marek Szyprowski | bcedb5f | 2014-02-28 14:42:54 +0100 | [diff] [blame] | 320 | early_init_fdt_scan_reserved_mem(); |
| 321 | |
George G. Davis | 99a468d | 2015-01-16 11:21:05 +0100 | [diff] [blame^] | 322 | /* reserve memory for DMA contiguous allocations */ |
Marek Szyprowski | 95b0e65 | 2014-10-09 15:26:49 -0700 | [diff] [blame] | 323 | dma_contiguous_reserve(arm_dma_limit); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 324 | |
Russell King | 716a3dc | 2012-01-13 15:00:51 +0000 | [diff] [blame] | 325 | arm_memblock_steal_permitted = false; |
Russell King | 2778f62 | 2010-07-09 16:27:52 +0100 | [diff] [blame] | 326 | memblock_dump_all(); |
| 327 | } |
| 328 | |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 329 | void __init bootmem_init(void) |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 330 | { |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 331 | unsigned long min, max_low, max_high; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 332 | |
Grygorii Strashko | 8e58cae | 2013-11-23 14:42:18 -0500 | [diff] [blame] | 333 | memblock_allow_resize(); |
Russell King | dde5828 | 2009-08-15 12:36:00 +0100 | [diff] [blame] | 334 | max_low = max_high = 0; |
| 335 | |
Russell King | f25b4b4 | 2010-10-27 19:49:33 +0100 | [diff] [blame] | 336 | find_limits(&min, &max_low, &max_high); |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 337 | |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 338 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 339 | * Sparsemem tries to allocate bootmem in memory_present(), |
| 340 | * so must be done after the fixed reservations |
| 341 | */ |
Russell King | eda2e5d | 2010-07-01 12:00:57 +0100 | [diff] [blame] | 342 | arm_memory_present(); |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 343 | |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 344 | /* |
| 345 | * sparse_init() needs the bootmem allocator up and running. |
| 346 | */ |
| 347 | sparse_init(); |
| 348 | |
| 349 | /* |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 350 | * Now free the memory - free_area_init_node needs |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 351 | * the sparse mem_map arrays initialized by sparse_init() |
| 352 | * for memmap_init_zone(), otherwise all PFNs are invalid. |
| 353 | */ |
Santosh Shilimkar | 84f452b | 2013-06-30 00:28:46 -0400 | [diff] [blame] | 354 | zone_sizes_init(min, max_low, max_high); |
Russell King | b7a69ac | 2008-10-01 16:58:32 +0100 | [diff] [blame] | 355 | |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 356 | /* |
| 357 | * This doesn't seem to be used by the Linux memory manager any |
| 358 | * more, but is used by ll_rw_block. If we can get rid of it, we |
| 359 | * also get rid of some of the stuff above as well. |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 360 | */ |
Santosh Shilimkar | 26ba47b | 2013-08-01 03:12:01 +0100 | [diff] [blame] | 361 | min_low_pfn = min; |
| 362 | max_low_pfn = max_low; |
| 363 | max_pfn = max_high; |
Russell King | 9007205 | 2005-10-28 14:48:37 +0100 | [diff] [blame] | 364 | } |
| 365 | |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 366 | /* |
| 367 | * Poison init memory with an undefined instruction (ARM) or a branch to an |
| 368 | * undefined instruction (Thumb). |
| 369 | */ |
| 370 | static inline void poison_init_mem(void *s, size_t count) |
| 371 | { |
| 372 | u32 *p = (u32 *)s; |
Jamie Iles | bf912d9 | 2011-08-04 09:39:31 +0100 | [diff] [blame] | 373 | for (; count != 0; count -= 4) |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 374 | *p++ = 0xe7fddef0; |
| 375 | } |
| 376 | |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 377 | static inline void |
Russell King | be37030 | 2010-05-07 17:40:33 +0100 | [diff] [blame] | 378 | free_memmap(unsigned long start_pfn, unsigned long end_pfn) |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 379 | { |
| 380 | struct page *start_pg, *end_pg; |
Vitaly Andrianov | 56bc628 | 2012-06-21 08:09:05 -0400 | [diff] [blame] | 381 | phys_addr_t pg, pgend; |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 382 | |
| 383 | /* |
| 384 | * Convert start_pfn/end_pfn to a struct page pointer. |
| 385 | */ |
Catalin Marinas | 3257f43 | 2009-10-06 17:57:22 +0100 | [diff] [blame] | 386 | start_pg = pfn_to_page(start_pfn - 1) + 1; |
Will Deacon | 9af386c | 2011-04-28 18:44:31 +0100 | [diff] [blame] | 387 | end_pg = pfn_to_page(end_pfn - 1) + 1; |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 388 | |
| 389 | /* |
| 390 | * Convert to physical addresses, and |
| 391 | * round start upwards and end downwards. |
| 392 | */ |
Vitaly Andrianov | 56bc628 | 2012-06-21 08:09:05 -0400 | [diff] [blame] | 393 | pg = PAGE_ALIGN(__pa(start_pg)); |
| 394 | pgend = __pa(end_pg) & PAGE_MASK; |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 395 | |
| 396 | /* |
| 397 | * If there are free pages between these, |
| 398 | * free the section of the memmap array. |
| 399 | */ |
| 400 | if (pg < pgend) |
Santosh Shilimkar | cfb66586 | 2014-01-21 15:50:49 -0800 | [diff] [blame] | 401 | memblock_free_early(pg, pgend - pg); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 402 | } |
| 403 | |
| 404 | /* |
| 405 | * The mem_map array can get very big. Free the unused area of the memory map. |
| 406 | */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 407 | static void __init free_unused_memmap(void) |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 408 | { |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 409 | unsigned long start, prev_end = 0; |
| 410 | struct memblock_region *reg; |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 411 | |
| 412 | /* |
Michael Bohan | 3260e52 | 2010-06-14 13:06:56 -0700 | [diff] [blame] | 413 | * This relies on each bank being in address order. |
| 414 | * The banks are sorted previously in bootmem_init(). |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 415 | */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 416 | for_each_memblock(memory, reg) { |
| 417 | start = memblock_region_memory_base_pfn(reg); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 418 | |
Will Deacon | 9af386c | 2011-04-28 18:44:31 +0100 | [diff] [blame] | 419 | #ifdef CONFIG_SPARSEMEM |
| 420 | /* |
| 421 | * Take care not to free memmap entries that don't exist |
| 422 | * due to SPARSEMEM sections which aren't present. |
| 423 | */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 424 | start = min(start, |
| 425 | ALIGN(prev_end, PAGES_PER_SECTION)); |
Linus Walleij | 002ea9eef | 2011-09-29 09:37:23 +0100 | [diff] [blame] | 426 | #else |
| 427 | /* |
| 428 | * Align down here since the VM subsystem insists that the |
| 429 | * memmap entries are valid from the bank start aligned to |
| 430 | * MAX_ORDER_NR_PAGES. |
| 431 | */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 432 | start = round_down(start, MAX_ORDER_NR_PAGES); |
Will Deacon | 9af386c | 2011-04-28 18:44:31 +0100 | [diff] [blame] | 433 | #endif |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 434 | /* |
| 435 | * If we had a previous bank, and there is a space |
| 436 | * between the current bank and the previous, free it. |
| 437 | */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 438 | if (prev_end && prev_end < start) |
| 439 | free_memmap(prev_end, start); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 440 | |
Michael Bohan | 3260e52 | 2010-06-14 13:06:56 -0700 | [diff] [blame] | 441 | /* |
| 442 | * Align up here since the VM subsystem insists that the |
| 443 | * memmap entries are valid from the bank end aligned to |
| 444 | * MAX_ORDER_NR_PAGES. |
| 445 | */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 446 | prev_end = ALIGN(memblock_region_memory_end_pfn(reg), |
| 447 | MAX_ORDER_NR_PAGES); |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 448 | } |
Will Deacon | 9af386c | 2011-04-28 18:44:31 +0100 | [diff] [blame] | 449 | |
| 450 | #ifdef CONFIG_SPARSEMEM |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 451 | if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) |
| 452 | free_memmap(prev_end, |
| 453 | ALIGN(prev_end, PAGES_PER_SECTION)); |
Will Deacon | 9af386c | 2011-04-28 18:44:31 +0100 | [diff] [blame] | 454 | #endif |
Russell King | a013053 | 2005-06-27 14:16:47 +0100 | [diff] [blame] | 455 | } |
| 456 | |
Jiang Liu | 83db038 | 2013-04-29 15:06:26 -0700 | [diff] [blame] | 457 | #ifdef CONFIG_HIGHMEM |
| 458 | static inline void free_area_high(unsigned long pfn, unsigned long end) |
| 459 | { |
Jiang Liu | dd6911e | 2013-04-29 15:07:03 -0700 | [diff] [blame] | 460 | for (; pfn < end; pfn++) |
| 461 | free_highmem_page(pfn_to_page(pfn)); |
Jiang Liu | 83db038 | 2013-04-29 15:06:26 -0700 | [diff] [blame] | 462 | } |
| 463 | #endif |
| 464 | |
Russell King | d0e775a | 2010-10-27 19:37:06 +0100 | [diff] [blame] | 465 | static void __init free_highpages(void) |
| 466 | { |
| 467 | #ifdef CONFIG_HIGHMEM |
Santosh Shilimkar | 26ba47b | 2013-08-01 03:12:01 +0100 | [diff] [blame] | 468 | unsigned long max_low = max_low_pfn; |
Russell King | df4f14c | 2010-10-27 19:45:49 +0100 | [diff] [blame] | 469 | struct memblock_region *mem, *res; |
Russell King | d0e775a | 2010-10-27 19:37:06 +0100 | [diff] [blame] | 470 | |
| 471 | /* set highmem page free */ |
Russell King | df4f14c | 2010-10-27 19:45:49 +0100 | [diff] [blame] | 472 | for_each_memblock(memory, mem) { |
| 473 | unsigned long start = memblock_region_memory_base_pfn(mem); |
| 474 | unsigned long end = memblock_region_memory_end_pfn(mem); |
| 475 | |
| 476 | /* Ignore complete lowmem entries */ |
| 477 | if (end <= max_low) |
| 478 | continue; |
| 479 | |
| 480 | /* Truncate partial highmem entries */ |
| 481 | if (start < max_low) |
| 482 | start = max_low; |
| 483 | |
| 484 | /* Find and exclude any reserved regions */ |
| 485 | for_each_memblock(reserved, res) { |
| 486 | unsigned long res_start, res_end; |
| 487 | |
| 488 | res_start = memblock_region_reserved_base_pfn(res); |
| 489 | res_end = memblock_region_reserved_end_pfn(res); |
| 490 | |
| 491 | if (res_end < start) |
| 492 | continue; |
| 493 | if (res_start < start) |
| 494 | res_start = start; |
| 495 | if (res_start > end) |
| 496 | res_start = end; |
| 497 | if (res_end > end) |
| 498 | res_end = end; |
| 499 | if (res_start != start) |
Jiang Liu | 83db038 | 2013-04-29 15:06:26 -0700 | [diff] [blame] | 500 | free_area_high(start, res_start); |
Russell King | df4f14c | 2010-10-27 19:45:49 +0100 | [diff] [blame] | 501 | start = res_end; |
| 502 | if (start == end) |
| 503 | break; |
| 504 | } |
| 505 | |
| 506 | /* And now free anything which remains */ |
| 507 | if (start < end) |
Jiang Liu | 83db038 | 2013-04-29 15:06:26 -0700 | [diff] [blame] | 508 | free_area_high(start, end); |
Russell King | d0e775a | 2010-10-27 19:37:06 +0100 | [diff] [blame] | 509 | } |
Russell King | d0e775a | 2010-10-27 19:37:06 +0100 | [diff] [blame] | 510 | #endif |
| 511 | } |
| 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | /* |
| 514 | * mem_init() marks the free areas in the mem_map and tells us how much |
| 515 | * memory is free. This is done after various parts of the system have |
| 516 | * claimed their memory after the kernel image. |
| 517 | */ |
| 518 | void __init mem_init(void) |
| 519 | { |
Linus Walleij | 1dbd30e | 2010-07-12 21:53:28 +0100 | [diff] [blame] | 520 | #ifdef CONFIG_HAVE_TCM |
| 521 | /* These pointers are filled in on TCM detection */ |
| 522 | extern u32 dtcm_end; |
| 523 | extern u32 itcm_end; |
| 524 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
Santosh Shilimkar | b3ba41f | 2013-11-23 14:36:42 -0500 | [diff] [blame] | 526 | set_max_mapnr(pfn_to_page(max_pfn) - mem_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | /* this will put all unused low memory onto the freelists */ |
Laura Abbott | 1c2f87c | 2014-04-13 22:54:58 +0100 | [diff] [blame] | 529 | free_unused_memmap(); |
Jiang Liu | 0c98853 | 2013-07-03 15:03:24 -0700 | [diff] [blame] | 530 | free_all_bootmem(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
| 532 | #ifdef CONFIG_SA1111 |
| 533 | /* now that our DMA memory is actually so designated, we can free it */ |
Linus Torvalds | bfd65dd | 2013-07-13 14:58:36 -0700 | [diff] [blame] | 534 | free_reserved_area(__va(PHYS_OFFSET), swapper_pg_dir, -1, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | #endif |
| 536 | |
Russell King | d0e775a | 2010-10-27 19:37:06 +0100 | [diff] [blame] | 537 | free_highpages(); |
Nicolas Pitre | 3835f6c | 2008-09-17 15:21:55 -0400 | [diff] [blame] | 538 | |
Jiang Liu | 2450c97 | 2013-07-03 15:03:48 -0700 | [diff] [blame] | 539 | mem_init_print_info(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 541 | #define MLK(b, t) b, t, ((t) - (b)) >> 10 |
| 542 | #define MLM(b, t) b, t, ((t) - (b)) >> 20 |
| 543 | #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) |
| 544 | |
Russell King | 4ed89f2 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 545 | pr_notice("Virtual kernel memory layout:\n" |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 546 | " vector : 0x%08lx - 0x%08lx (%4ld kB)\n" |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 547 | #ifdef CONFIG_HAVE_TCM |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 548 | " DTCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 549 | " ITCM : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 550 | #endif |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 551 | " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| 552 | " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 553 | " lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 554 | #ifdef CONFIG_HIGHMEM |
| 555 | " pkmap : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| 556 | #endif |
Uwe Kleine-König | d9277d5 | 2012-02-01 11:16:51 +0100 | [diff] [blame] | 557 | #ifdef CONFIG_MODULES |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 558 | " modules : 0x%08lx - 0x%08lx (%4ld MB)\n" |
Uwe Kleine-König | d9277d5 | 2012-02-01 11:16:51 +0100 | [diff] [blame] | 559 | #endif |
Russell King | 178c3df | 2014-10-19 22:42:42 +0100 | [diff] [blame] | 560 | " .text : 0x%p" " - 0x%p" " (%4td kB)\n" |
| 561 | " .init : 0x%p" " - 0x%p" " (%4td kB)\n" |
| 562 | " .data : 0x%p" " - 0x%p" " (%4td kB)\n" |
| 563 | " .bss : 0x%p" " - 0x%p" " (%4td kB)\n", |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 564 | |
| 565 | MLK(UL(CONFIG_VECTORS_BASE), UL(CONFIG_VECTORS_BASE) + |
| 566 | (PAGE_SIZE)), |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 567 | #ifdef CONFIG_HAVE_TCM |
Linus Walleij | 1dbd30e | 2010-07-12 21:53:28 +0100 | [diff] [blame] | 568 | MLK(DTCM_OFFSET, (unsigned long) dtcm_end), |
| 569 | MLK(ITCM_OFFSET, (unsigned long) itcm_end), |
Linus Walleij | 07d2a5c | 2010-07-12 21:52:34 +0100 | [diff] [blame] | 570 | #endif |
Mark Salter | b615bbb | 2014-08-13 09:04:49 -0700 | [diff] [blame] | 571 | MLK(FIXADDR_START, FIXADDR_END), |
Fenkart/Bostandzhyan | c931b4f | 2010-02-07 21:47:17 +0100 | [diff] [blame] | 572 | MLM(VMALLOC_START, VMALLOC_END), |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 573 | MLM(PAGE_OFFSET, (unsigned long)high_memory), |
| 574 | #ifdef CONFIG_HIGHMEM |
| 575 | MLM(PKMAP_BASE, (PKMAP_BASE) + (LAST_PKMAP) * |
| 576 | (PAGE_SIZE)), |
| 577 | #endif |
Uwe Kleine-König | d9277d5 | 2012-02-01 11:16:51 +0100 | [diff] [blame] | 578 | #ifdef CONFIG_MODULES |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 579 | MLM(MODULES_VADDR, MODULES_END), |
Uwe Kleine-König | d9277d5 | 2012-02-01 11:16:51 +0100 | [diff] [blame] | 580 | #endif |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 581 | |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 582 | MLK_ROUNDUP(_text, _etext), |
Russell King | 3835d69 | 2011-07-06 10:39:34 +0100 | [diff] [blame] | 583 | MLK_ROUNDUP(__init_begin, __init_end), |
Rabin Vincent | 45f6d7e | 2011-06-02 15:01:36 +0100 | [diff] [blame] | 584 | MLK_ROUNDUP(_sdata, _edata), |
| 585 | MLK_ROUNDUP(__bss_start, __bss_stop)); |
Fenkart/Bostandzhyan | db9ef1a | 2010-02-07 21:45:47 +0100 | [diff] [blame] | 586 | |
| 587 | #undef MLK |
| 588 | #undef MLM |
| 589 | #undef MLK_ROUNDUP |
| 590 | |
Fenkart/Bostandzhyan | a183927 | 2010-02-07 21:47:58 +0100 | [diff] [blame] | 591 | /* |
| 592 | * Check boundaries twice: Some fundamental inconsistencies can |
| 593 | * be detected at build time already. |
| 594 | */ |
| 595 | #ifdef CONFIG_MMU |
Fenkart/Bostandzhyan | a183927 | 2010-02-07 21:47:58 +0100 | [diff] [blame] | 596 | BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
| 597 | BUG_ON(TASK_SIZE > MODULES_VADDR); |
| 598 | #endif |
| 599 | |
| 600 | #ifdef CONFIG_HIGHMEM |
| 601 | BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| 602 | BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET); |
| 603 | #endif |
| 604 | |
Jiang Liu | 2450c97 | 2013-07-03 15:03:48 -0700 | [diff] [blame] | 605 | if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | extern int sysctl_overcommit_memory; |
| 607 | /* |
| 608 | * On a machine this small we won't get |
| 609 | * anywhere without overcommit, so turn |
| 610 | * it on by default. |
| 611 | */ |
| 612 | sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; |
| 613 | } |
| 614 | } |
| 615 | |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 616 | #ifdef CONFIG_ARM_KERNMEM_PERMS |
| 617 | struct section_perm { |
| 618 | unsigned long start; |
| 619 | unsigned long end; |
| 620 | pmdval_t mask; |
| 621 | pmdval_t prot; |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 622 | pmdval_t clear; |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 623 | }; |
| 624 | |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 625 | static struct section_perm nx_perms[] = { |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 626 | /* Make pages tables, etc before _stext RW (set NX). */ |
| 627 | { |
| 628 | .start = PAGE_OFFSET, |
| 629 | .end = (unsigned long)_stext, |
| 630 | .mask = ~PMD_SECT_XN, |
| 631 | .prot = PMD_SECT_XN, |
| 632 | }, |
| 633 | /* Make init RW (set NX). */ |
| 634 | { |
| 635 | .start = (unsigned long)__init_begin, |
| 636 | .end = (unsigned long)_sdata, |
| 637 | .mask = ~PMD_SECT_XN, |
| 638 | .prot = PMD_SECT_XN, |
| 639 | }, |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 640 | #ifdef CONFIG_DEBUG_RODATA |
| 641 | /* Make rodata NX (set RO in ro_perms below). */ |
| 642 | { |
| 643 | .start = (unsigned long)__start_rodata, |
| 644 | .end = (unsigned long)__init_begin, |
| 645 | .mask = ~PMD_SECT_XN, |
| 646 | .prot = PMD_SECT_XN, |
| 647 | }, |
| 648 | #endif |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 649 | }; |
| 650 | |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 651 | #ifdef CONFIG_DEBUG_RODATA |
| 652 | static struct section_perm ro_perms[] = { |
| 653 | /* Make kernel code and rodata RX (set RO). */ |
| 654 | { |
| 655 | .start = (unsigned long)_stext, |
| 656 | .end = (unsigned long)__init_begin, |
| 657 | #ifdef CONFIG_ARM_LPAE |
| 658 | .mask = ~PMD_SECT_RDONLY, |
| 659 | .prot = PMD_SECT_RDONLY, |
| 660 | #else |
| 661 | .mask = ~(PMD_SECT_APX | PMD_SECT_AP_WRITE), |
| 662 | .prot = PMD_SECT_APX | PMD_SECT_AP_WRITE, |
| 663 | .clear = PMD_SECT_AP_WRITE, |
| 664 | #endif |
| 665 | }, |
| 666 | }; |
| 667 | #endif |
| 668 | |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 669 | /* |
| 670 | * Updates section permissions only for the current mm (sections are |
| 671 | * copied into each mm). During startup, this is the init_mm. Is only |
| 672 | * safe to be called with preemption disabled, as under stop_machine(). |
| 673 | */ |
| 674 | static inline void section_update(unsigned long addr, pmdval_t mask, |
| 675 | pmdval_t prot) |
| 676 | { |
| 677 | struct mm_struct *mm; |
| 678 | pmd_t *pmd; |
| 679 | |
| 680 | mm = current->active_mm; |
| 681 | pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr); |
| 682 | |
| 683 | #ifdef CONFIG_ARM_LPAE |
| 684 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); |
| 685 | #else |
| 686 | if (addr & SECTION_SIZE) |
| 687 | pmd[1] = __pmd((pmd_val(pmd[1]) & mask) | prot); |
| 688 | else |
| 689 | pmd[0] = __pmd((pmd_val(pmd[0]) & mask) | prot); |
| 690 | #endif |
| 691 | flush_pmd_entry(pmd); |
| 692 | local_flush_tlb_kernel_range(addr, addr + SECTION_SIZE); |
| 693 | } |
| 694 | |
| 695 | /* Make sure extended page tables are in use. */ |
| 696 | static inline bool arch_has_strict_perms(void) |
| 697 | { |
| 698 | if (cpu_architecture() < CPU_ARCH_ARMv6) |
| 699 | return false; |
| 700 | |
| 701 | return !!(get_cr() & CR_XP); |
| 702 | } |
| 703 | |
| 704 | #define set_section_perms(perms, field) { \ |
| 705 | size_t i; \ |
| 706 | unsigned long addr; \ |
| 707 | \ |
| 708 | if (!arch_has_strict_perms()) \ |
| 709 | return; \ |
| 710 | \ |
| 711 | for (i = 0; i < ARRAY_SIZE(perms); i++) { \ |
| 712 | if (!IS_ALIGNED(perms[i].start, SECTION_SIZE) || \ |
| 713 | !IS_ALIGNED(perms[i].end, SECTION_SIZE)) { \ |
| 714 | pr_err("BUG: section %lx-%lx not aligned to %lx\n", \ |
| 715 | perms[i].start, perms[i].end, \ |
| 716 | SECTION_SIZE); \ |
| 717 | continue; \ |
| 718 | } \ |
| 719 | \ |
| 720 | for (addr = perms[i].start; \ |
| 721 | addr < perms[i].end; \ |
| 722 | addr += SECTION_SIZE) \ |
| 723 | section_update(addr, perms[i].mask, \ |
| 724 | perms[i].field); \ |
| 725 | } \ |
| 726 | } |
| 727 | |
| 728 | static inline void fix_kernmem_perms(void) |
| 729 | { |
| 730 | set_section_perms(nx_perms, prot); |
| 731 | } |
Kees Cook | 80d6b0c | 2014-04-03 13:29:50 -0700 | [diff] [blame] | 732 | |
| 733 | #ifdef CONFIG_DEBUG_RODATA |
| 734 | void mark_rodata_ro(void) |
| 735 | { |
| 736 | set_section_perms(ro_perms, prot); |
| 737 | } |
| 738 | |
| 739 | void set_kernel_text_rw(void) |
| 740 | { |
| 741 | set_section_perms(ro_perms, clear); |
| 742 | } |
| 743 | |
| 744 | void set_kernel_text_ro(void) |
| 745 | { |
| 746 | set_section_perms(ro_perms, prot); |
| 747 | } |
| 748 | #endif /* CONFIG_DEBUG_RODATA */ |
| 749 | |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 750 | #else |
| 751 | static inline void fix_kernmem_perms(void) { } |
| 752 | #endif /* CONFIG_ARM_KERNMEM_PERMS */ |
| 753 | |
| 754 | void free_tcmmem(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | { |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 756 | #ifdef CONFIG_HAVE_TCM |
Linus Walleij | ea208f6 | 2010-05-26 07:37:57 +0100 | [diff] [blame] | 757 | extern char __tcm_start, __tcm_end; |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 758 | |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 759 | poison_init_mem(&__tcm_start, &__tcm_end - &__tcm_start); |
Jiang Liu | dbe67df | 2013-07-03 15:02:51 -0700 | [diff] [blame] | 760 | free_reserved_area(&__tcm_start, &__tcm_end, -1, "TCM link"); |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 761 | #endif |
Kees Cook | 1e6b481 | 2014-04-03 17:28:11 -0700 | [diff] [blame] | 762 | } |
| 763 | |
| 764 | void free_initmem(void) |
| 765 | { |
| 766 | fix_kernmem_perms(); |
| 767 | free_tcmmem(); |
Linus Walleij | bc58177 | 2009-09-15 17:30:37 +0100 | [diff] [blame] | 768 | |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 769 | poison_init_mem(__init_begin, __init_end - __init_begin); |
Nicolas Pitre | 6db015e | 2008-09-17 14:50:42 -0400 | [diff] [blame] | 770 | if (!machine_is_integrator() && !machine_is_cintegrator()) |
Jiang Liu | dbe67df | 2013-07-03 15:02:51 -0700 | [diff] [blame] | 771 | free_initmem_default(-1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | #ifdef CONFIG_BLK_DEV_INITRD |
| 775 | |
| 776 | static int keep_initrd; |
| 777 | |
| 778 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 779 | { |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 780 | if (!keep_initrd) { |
Yalin Wang | 421520b | 2014-09-26 03:07:09 +0100 | [diff] [blame] | 781 | if (start == initrd_start) |
| 782 | start = round_down(start, PAGE_SIZE); |
| 783 | if (end == initrd_end) |
| 784 | end = round_up(end, PAGE_SIZE); |
| 785 | |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 786 | poison_init_mem((void *)start, PAGE_ALIGN(end) - start); |
Jiang Liu | dbe67df | 2013-07-03 15:02:51 -0700 | [diff] [blame] | 787 | free_reserved_area((void *)start, (void *)end, -1, "initrd"); |
Stephen Boyd | 54d5257 | 2011-07-07 18:43:36 +0100 | [diff] [blame] | 788 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | } |
| 790 | |
| 791 | static int __init keepinitrd_setup(char *__unused) |
| 792 | { |
| 793 | keep_initrd = 1; |
| 794 | return 1; |
| 795 | } |
| 796 | |
| 797 | __setup("keepinitrd", keepinitrd_setup); |
| 798 | #endif |