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 18 #include <linux/kernel.h> 19 #include <linux/errno.h> 20 #include <linux/bootmem.h> 21 #include <linux/swap.h> 22 #include <linux/mman.h> 23 #include <linux/nodemask.h> 24 #include <linux/mm.h> 25 #include <linux/slab.h> 26 27 #include <asm/bootparam.h> 28 #include <asm/page.h> 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"); 120 121 max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ? 122 max_pfn : MAX_MEM_PFN >> PAGE_SHIFT; 123 124 /* Find an area to use for the bootmem bitmap. */ 125 126 bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn); 127 bootmap_size <<= PAGE_SHIFT; 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); 142 bootmap_size = init_bootmem_node(NODE_DATA(0), 143 bootmap_start >> PAGE_SHIFT, 144 min_low_pfn, 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 } 154 155 156 void __init zones_init(void) 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. */ 162 163 zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET; 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 170 171 free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); 172 } 173 174 /* 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; 182 183 max_mapnr = num_physpages = max_low_pfn - ARCH_PFN_OFFSET; 184 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 185 highmemsize = 0; 186 187 #ifdef CONFIG_HIGHMEM 188 #error HIGHGMEM not implemented in init.c 189 #endif 190 191 totalram_pages += free_all_bootmem(); 192 193 reservedpages = ram = 0; 194 for (tmp = 0; tmp < max_mapnr; tmp++) { 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", 206 nr_free_pages() << (PAGE_SHIFT-10), 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)); 220 init_page_count(virt_to_page(start)); 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 } 244