Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/xtensa/mm/init.c |
| 3 | * |
| 4 | * Derived from MIPS, PPC. |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file "COPYING" in the main directory of this archive |
| 8 | * for more details. |
| 9 | * |
| 10 | * Copyright (C) 2001 - 2005 Tensilica Inc. |
| 11 | * |
| 12 | * Chris Zankel <chris@zankel.net> |
| 13 | * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> |
| 14 | * Marc Gauthier |
| 15 | * Kevin Chea |
| 16 | */ |
| 17 | |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 18 | #include <linux/kernel.h> |
| 19 | #include <linux/errno.h> |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 20 | #include <linux/bootmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/gfp.h> |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 22 | #include <linux/swap.h> |
Chris Zankel | 6656920 | 2007-08-22 10:14:51 -0700 | [diff] [blame] | 23 | #include <linux/mman.h> |
| 24 | #include <linux/nodemask.h> |
| 25 | #include <linux/mm.h> |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 26 | |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 27 | #include <asm/bootparam.h> |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 28 | #include <asm/page.h> |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 29 | |
| 30 | /* References to section boundaries */ |
| 31 | |
| 32 | extern char _ftext, _etext, _fdata, _edata, _rodata_end; |
| 33 | extern char __init_begin, __init_end; |
| 34 | |
| 35 | /* |
| 36 | * mem_reserve(start, end, must_exist) |
| 37 | * |
| 38 | * Reserve some memory from the memory pool. |
| 39 | * |
| 40 | * Parameters: |
| 41 | * start Start of region, |
| 42 | * end End of region, |
| 43 | * must_exist Must exist in memory pool. |
| 44 | * |
| 45 | * Returns: |
| 46 | * 0 (memory area couldn't be mapped) |
| 47 | * -1 (success) |
| 48 | */ |
| 49 | |
| 50 | int __init mem_reserve(unsigned long start, unsigned long end, int must_exist) |
| 51 | { |
| 52 | int i; |
| 53 | |
| 54 | if (start == end) |
| 55 | return 0; |
| 56 | |
| 57 | start = start & PAGE_MASK; |
| 58 | end = PAGE_ALIGN(end); |
| 59 | |
| 60 | for (i = 0; i < sysmem.nr_banks; i++) |
| 61 | if (start < sysmem.bank[i].end |
| 62 | && end >= sysmem.bank[i].start) |
| 63 | break; |
| 64 | |
| 65 | if (i == sysmem.nr_banks) { |
| 66 | if (must_exist) |
| 67 | printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) " |
| 68 | "not in any region!\n", start, end); |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | if (start > sysmem.bank[i].start) { |
| 73 | if (end < sysmem.bank[i].end) { |
| 74 | /* split entry */ |
| 75 | if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) |
| 76 | panic("meminfo overflow\n"); |
| 77 | sysmem.bank[sysmem.nr_banks].start = end; |
| 78 | sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end; |
| 79 | sysmem.nr_banks++; |
| 80 | } |
| 81 | sysmem.bank[i].end = start; |
| 82 | } else { |
| 83 | if (end < sysmem.bank[i].end) |
| 84 | sysmem.bank[i].start = end; |
| 85 | else { |
| 86 | /* remove entry */ |
| 87 | sysmem.nr_banks--; |
| 88 | sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start; |
| 89 | sysmem.bank[i].end = sysmem.bank[sysmem.nr_banks].end; |
| 90 | } |
| 91 | } |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | |
| 96 | /* |
| 97 | * Initialize the bootmem system and give it all the memory we have available. |
| 98 | */ |
| 99 | |
| 100 | void __init bootmem_init(void) |
| 101 | { |
| 102 | unsigned long pfn; |
| 103 | unsigned long bootmap_start, bootmap_size; |
| 104 | int i; |
| 105 | |
| 106 | max_low_pfn = max_pfn = 0; |
| 107 | min_low_pfn = ~0; |
| 108 | |
| 109 | for (i=0; i < sysmem.nr_banks; i++) { |
| 110 | pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT; |
| 111 | if (pfn < min_low_pfn) |
| 112 | min_low_pfn = pfn; |
| 113 | pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT; |
| 114 | if (pfn > max_pfn) |
| 115 | max_pfn = pfn; |
| 116 | } |
| 117 | |
| 118 | if (min_low_pfn > max_pfn) |
| 119 | panic("No memory found!\n"); |
| 120 | |
Chris Zankel | 173d6681 | 2006-12-10 02:18:48 -0800 | [diff] [blame] | 121 | max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ? |
| 122 | max_pfn : MAX_MEM_PFN >> PAGE_SHIFT; |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 123 | |
| 124 | /* Find an area to use for the bootmem bitmap. */ |
| 125 | |
Johannes Weiner | 264da9f | 2009-03-04 16:21:29 +0100 | [diff] [blame] | 126 | bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn); |
| 127 | bootmap_size <<= PAGE_SHIFT; |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 128 | bootmap_start = ~0; |
| 129 | |
| 130 | for (i=0; i<sysmem.nr_banks; i++) |
| 131 | if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) { |
| 132 | bootmap_start = sysmem.bank[i].start; |
| 133 | break; |
| 134 | } |
| 135 | |
| 136 | if (bootmap_start == ~0UL) |
| 137 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); |
| 138 | |
| 139 | /* Reserve the bootmem bitmap area */ |
| 140 | |
| 141 | mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1); |
Johannes Weiner | 0bef42e | 2009-03-04 16:21:29 +0100 | [diff] [blame] | 142 | bootmap_size = init_bootmem_node(NODE_DATA(0), |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 143 | bootmap_start >> PAGE_SHIFT, |
Johannes Weiner | 0bef42e | 2009-03-04 16:21:29 +0100 | [diff] [blame] | 144 | min_low_pfn, |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 145 | max_low_pfn); |
| 146 | |
| 147 | /* Add all remaining memory pieces into the bootmem map */ |
| 148 | |
| 149 | for (i=0; i<sysmem.nr_banks; i++) |
| 150 | free_bootmem(sysmem.bank[i].start, |
| 151 | sysmem.bank[i].end - sysmem.bank[i].start); |
| 152 | |
| 153 | } |
| 154 | |
| 155 | |
Johannes Weiner | e5083a6 | 2009-03-04 16:21:31 +0100 | [diff] [blame] | 156 | void __init zones_init(void) |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 157 | { |
| 158 | unsigned long zones_size[MAX_NR_ZONES]; |
| 159 | int i; |
| 160 | |
| 161 | /* All pages are DMA-able, so we put them all in the DMA zone. */ |
| 162 | |
Johannes Weiner | c947a58 | 2009-03-04 16:21:30 +0100 | [diff] [blame] | 163 | zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET; |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 164 | for (i = 1; i < MAX_NR_ZONES; i++) |
| 165 | zones_size[i] = 0; |
| 166 | |
| 167 | #ifdef CONFIG_HIGHMEM |
| 168 | zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn; |
| 169 | #endif |
| 170 | |
Johannes Weiner | c947a58 | 2009-03-04 16:21:30 +0100 | [diff] [blame] | 171 | free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 172 | } |
| 173 | |
| 174 | /* |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 175 | * Initialize memory pages. |
| 176 | */ |
| 177 | |
| 178 | void __init mem_init(void) |
| 179 | { |
| 180 | unsigned long codesize, reservedpages, datasize, initsize; |
| 181 | unsigned long highmemsize, tmp, ram; |
| 182 | |
Johannes Weiner | c947a58 | 2009-03-04 16:21:30 +0100 | [diff] [blame] | 183 | max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET; |
| 184 | high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 185 | highmemsize = 0; |
| 186 | |
Chris Zankel | 288a60c | 2005-09-22 21:44:23 -0700 | [diff] [blame] | 187 | #ifdef CONFIG_HIGHMEM |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 188 | #error HIGHGMEM not implemented in init.c |
| 189 | #endif |
| 190 | |
| 191 | totalram_pages += free_all_bootmem(); |
| 192 | |
| 193 | reservedpages = ram = 0; |
Johannes Weiner | c947a58 | 2009-03-04 16:21:30 +0100 | [diff] [blame] | 194 | for (tmp = 0; tmp < max_mapnr; tmp++) { |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 195 | ram++; |
| 196 | if (PageReserved(mem_map+tmp)) |
| 197 | reservedpages++; |
| 198 | } |
| 199 | |
| 200 | codesize = (unsigned long) &_etext - (unsigned long) &_ftext; |
| 201 | datasize = (unsigned long) &_edata - (unsigned long) &_fdata; |
| 202 | initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; |
| 203 | |
| 204 | printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, " |
| 205 | "%ldk data, %ldk init %ldk highmem)\n", |
Geert Uytterhoeven | cc013a8 | 2009-09-21 17:02:36 -0700 | [diff] [blame] | 206 | nr_free_pages() << (PAGE_SHIFT-10), |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 207 | ram << (PAGE_SHIFT-10), |
| 208 | codesize >> 10, |
| 209 | reservedpages << (PAGE_SHIFT-10), |
| 210 | datasize >> 10, |
| 211 | initsize >> 10, |
| 212 | highmemsize >> 10); |
| 213 | } |
| 214 | |
| 215 | void |
| 216 | free_reserved_mem(void *start, void *end) |
| 217 | { |
| 218 | for (; start < end; start += PAGE_SIZE) { |
| 219 | ClearPageReserved(virt_to_page(start)); |
Nick Piggin | 7835e98 | 2006-03-22 00:08:40 -0800 | [diff] [blame] | 220 | init_page_count(virt_to_page(start)); |
Chris Zankel | 3f65ce4 | 2005-06-23 22:01:24 -0700 | [diff] [blame] | 221 | free_page((unsigned long)start); |
| 222 | totalram_pages++; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | #ifdef CONFIG_BLK_DEV_INITRD |
| 227 | extern int initrd_is_mapped; |
| 228 | |
| 229 | void free_initrd_mem(unsigned long start, unsigned long end) |
| 230 | { |
| 231 | if (initrd_is_mapped) { |
| 232 | free_reserved_mem((void*)start, (void*)end); |
| 233 | printk ("Freeing initrd memory: %ldk freed\n",(end-start)>>10); |
| 234 | } |
| 235 | } |
| 236 | #endif |
| 237 | |
| 238 | void free_initmem(void) |
| 239 | { |
| 240 | free_reserved_mem(&__init_begin, &__init_end); |
| 241 | printk("Freeing unused kernel memory: %dk freed\n", |
| 242 | (&__init_end - &__init_begin) >> 10); |
| 243 | } |