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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 | /* * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu> * Copyright (C) 2006 Atmark Techno, Inc. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/bootmem.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/memblock.h> #include <linux/mm.h> /* mem_init */ #include <linux/initrd.h> #include <linux/pagemap.h> #include <linux/pfn.h> #include <linux/slab.h> #include <linux/swap.h> #include <asm/page.h> #include <asm/mmu_context.h> #include <asm/pgalloc.h> #include <asm/sections.h> #include <asm/tlb.h> /* Use for MMU and noMMU because of PCI generic code */ int mem_init_done; #ifndef CONFIG_MMU unsigned int __page_offset; EXPORT_SYMBOL(__page_offset); #else DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); static int init_bootmem_done; #endif /* CONFIG_MMU */ char *klimit = _end; /* * Initialize the bootmem system and give it all the memory we * have available. */ unsigned long memory_start; EXPORT_SYMBOL(memory_start); unsigned long memory_end; /* due to mm/nommu.c */ unsigned long memory_size; EXPORT_SYMBOL(memory_size); /* * paging_init() sets up the page tables - in fact we've already done this. */ static void __init paging_init(void) { unsigned long zones_size[MAX_NR_ZONES]; /* Clean every zones */ memset(zones_size, 0, sizeof(zones_size)); /* * old: we can DMA to/from any address.put all page into ZONE_DMA * We use only ZONE_NORMAL */ zones_size[ZONE_NORMAL] = max_mapnr; free_area_init(zones_size); } void __init setup_memory(void) { unsigned long map_size; struct memblock_region *reg; #ifndef CONFIG_MMU u32 kernel_align_start, kernel_align_size; /* Find main memory where is the kernel */ for_each_memblock(memory, reg) { memory_start = (u32)reg->base; memory_end = (u32) reg->base + reg->size; if ((memory_start <= (u32)_text) && ((u32)_text <= memory_end)) { memory_size = memory_end - memory_start; PAGE_OFFSET = memory_start; printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, " "size 0x%08x\n", __func__, (u32) memory_start, (u32) memory_end, (u32) memory_size); break; } } if (!memory_start || !memory_end) { panic("%s: Missing memory setting 0x%08x-0x%08x\n", __func__, (u32) memory_start, (u32) memory_end); } /* reservation of region where is the kernel */ kernel_align_start = PAGE_DOWN((u32)_text); /* ALIGN can be remove because _end in vmlinux.lds.S is align */ kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start; memblock_reserve(kernel_align_start, kernel_align_size); printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n", __func__, kernel_align_start, kernel_align_start + kernel_align_size, kernel_align_size); #endif /* * Kernel: * start: base phys address of kernel - page align * end: base phys address of kernel - page align * * min_low_pfn - the first page (mm/bootmem.c - node_boot_start) * max_low_pfn * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn) * num_physpages - number of all pages */ /* memory start is from the kernel end (aligned) to higher addr */ min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */ /* RAM is assumed contiguous */ num_physpages = max_mapnr = memory_size >> PAGE_SHIFT; max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT; printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr); printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn); printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn); /* * Find an area to use for the bootmem bitmap. * We look for the first area which is at least * 128kB in length (128kB is enough for a bitmap * for 4GB of memory, using 4kB pages), plus 1 page * (in case the address isn't page-aligned). */ map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn); memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size); /* free bootmem is whole main memory */ free_bootmem(memory_start, memory_size); /* reserve allocate blocks */ for_each_memblock(reserved, reg) { pr_debug("reserved - 0x%08x-0x%08x\n", (u32) reg->base, (u32) reg->size); reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); } #ifdef CONFIG_MMU init_bootmem_done = 1; #endif paging_init(); } void free_init_pages(char *what, unsigned long begin, unsigned long end) { unsigned long addr; for (addr = begin; addr < end; addr += PAGE_SIZE) { ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); totalram_pages++; } printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { int pages = 0; for (; start < end; start += PAGE_SIZE) { ClearPageReserved(virt_to_page(start)); init_page_count(virt_to_page(start)); free_page(start); totalram_pages++; pages++; } printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", (int)(pages * (PAGE_SIZE / 1024))); } #endif void free_initmem(void) { free_init_pages("unused kernel memory", (unsigned long)(&__init_begin), (unsigned long)(&__init_end)); } void __init mem_init(void) { high_memory = (void *)__va(memory_end); /* this will put all memory onto the freelists */ totalram_pages += free_all_bootmem(); printk(KERN_INFO "Memory: %luk/%luk available\n", nr_free_pages() << (PAGE_SHIFT-10), num_physpages << (PAGE_SHIFT-10)); mem_init_done = 1; } #ifndef CONFIG_MMU int page_is_ram(unsigned long pfn) { return __range_ok(pfn, 0); } #else int page_is_ram(unsigned long pfn) { return pfn < max_low_pfn; } /* * Check for command-line options that affect what MMU_init will do. */ static void mm_cmdline_setup(void) { unsigned long maxmem = 0; char *p = cmd_line; /* Look for mem= option on command line */ p = strstr(cmd_line, "mem="); if (p) { p += 4; maxmem = memparse(p, &p); if (maxmem && memory_size > maxmem) { memory_size = maxmem; memory_end = memory_start + memory_size; memblock.memory.regions[0].size = memory_size; } } } /* * MMU_init_hw does the chip-specific initialization of the MMU hardware. */ static void __init mmu_init_hw(void) { /* * The Zone Protection Register (ZPR) defines how protection will * be applied to every page which is a member of a given zone. At * present, we utilize only two of the zones. * The zone index bits (of ZSEL) in the PTE are used for software * indicators, except the LSB. For user access, zone 1 is used, * for kernel access, zone 0 is used. We set all but zone 1 * to zero, allowing only kernel access as indicated in the PTE. * For zone 1, we set a 01 binary (a value of 10 will not work) * to allow user access as indicated in the PTE. This also allows * kernel access as indicated in the PTE. */ __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \ "mts rzpr, r11;" : : : "r11"); } /* * MMU_init sets up the basic memory mappings for the kernel, * including both RAM and possibly some I/O regions, * and sets up the page tables and the MMU hardware ready to go. */ /* called from head.S */ asmlinkage void __init mmu_init(void) { unsigned int kstart, ksize; if (!memblock.reserved.cnt) { printk(KERN_EMERG "Error memory count\n"); machine_restart(NULL); } if ((u32) memblock.memory.regions[0].size < 0x1000000) { printk(KERN_EMERG "Memory must be greater than 16MB\n"); machine_restart(NULL); } /* Find main memory where the kernel is */ memory_start = (u32) memblock.memory.regions[0].base; memory_end = (u32) memblock.memory.regions[0].base + (u32) memblock.memory.regions[0].size; memory_size = memory_end - memory_start; mm_cmdline_setup(); /* FIXME parse args from command line - not used */ /* * Map out the kernel text/data/bss from the available physical * memory. */ kstart = __pa(CONFIG_KERNEL_START); /* kernel start */ /* kernel size */ ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START)); memblock_reserve(kstart, ksize); #if defined(CONFIG_BLK_DEV_INITRD) /* Remove the init RAM disk from the available memory. */ /* if (initrd_start) { mem_pieces_remove(&phys_avail, __pa(initrd_start), initrd_end - initrd_start, 1); }*/ #endif /* CONFIG_BLK_DEV_INITRD */ /* Initialize the MMU hardware */ mmu_init_hw(); /* Map in all of RAM starting at CONFIG_KERNEL_START */ mapin_ram(); #ifdef HIGHMEM_START_BOOL ioremap_base = HIGHMEM_START; #else ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */ #endif /* CONFIG_HIGHMEM */ ioremap_bot = ioremap_base; /* Initialize the context management stuff */ mmu_context_init(); } /* This is only called until mem_init is done. */ void __init *early_get_page(void) { void *p; if (init_bootmem_done) { p = alloc_bootmem_pages(PAGE_SIZE); } else { /* * Mem start + 32MB -> here is limit * because of mem mapping from head.S */ p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE, memory_start + 0x2000000)); } return p; } #endif /* CONFIG_MMU */ void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask) { if (mem_init_done) return kmalloc(size, mask); else return alloc_bootmem(size); } void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask) { void *p; if (mem_init_done) p = kzalloc(size, mask); else { p = alloc_bootmem(size); if (p) memset(p, 0, size); } return p; } |