1 /* 2 * Based on arch/arm/mm/init.c 3 * 4 * Copyright (C) 1995-2005 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include <linux/kernel.h> 21 #include <linux/export.h> 22 #include <linux/errno.h> 23 #include <linux/swap.h> 24 #include <linux/init.h> 25 #include <linux/bootmem.h> 26 #include <linux/mman.h> 27 #include <linux/nodemask.h> 28 #include <linux/initrd.h> 29 #include <linux/gfp.h> 30 #include <linux/memblock.h> 31 #include <linux/sort.h> 32 #include <linux/of_fdt.h> 33 34 #include <asm/sections.h> 35 #include <asm/setup.h> 36 #include <asm/sizes.h> 37 #include <asm/tlb.h> 38 39 #include "mm.h" 40 41 phys_addr_t memstart_addr __read_mostly = 0; 42 43 #ifdef CONFIG_BLK_DEV_INITRD 44 static int __init early_initrd(char *p) 45 { 46 unsigned long start, size; 47 char *endp; 48 49 start = memparse(p, &endp); 50 if (*endp == ',') { 51 size = memparse(endp + 1, NULL); 52 53 initrd_start = (unsigned long)__va(start); 54 initrd_end = (unsigned long)__va(start + size); 55 } 56 return 0; 57 } 58 early_param("initrd", early_initrd); 59 #endif 60 61 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) 62 63 static void __init zone_sizes_init(unsigned long min, unsigned long max) 64 { 65 struct memblock_region *reg; 66 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 67 unsigned long max_dma32 = min; 68 69 memset(zone_size, 0, sizeof(zone_size)); 70 71 #ifdef CONFIG_ZONE_DMA32 72 /* 4GB maximum for 32-bit only capable devices */ 73 max_dma32 = max(min, min(max, MAX_DMA32_PFN)); 74 zone_size[ZONE_DMA32] = max_dma32 - min; 75 #endif 76 zone_size[ZONE_NORMAL] = max - max_dma32; 77 78 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 79 80 for_each_memblock(memory, reg) { 81 unsigned long start = memblock_region_memory_base_pfn(reg); 82 unsigned long end = memblock_region_memory_end_pfn(reg); 83 84 if (start >= max) 85 continue; 86 #ifdef CONFIG_ZONE_DMA32 87 if (start < max_dma32) { 88 unsigned long dma_end = min(end, max_dma32); 89 zhole_size[ZONE_DMA32] -= dma_end - start; 90 } 91 #endif 92 if (end > max_dma32) { 93 unsigned long normal_end = min(end, max); 94 unsigned long normal_start = max(start, max_dma32); 95 zhole_size[ZONE_NORMAL] -= normal_end - normal_start; 96 } 97 } 98 99 free_area_init_node(0, zone_size, min, zhole_size); 100 } 101 102 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 103 int pfn_valid(unsigned long pfn) 104 { 105 return memblock_is_memory(pfn << PAGE_SHIFT); 106 } 107 EXPORT_SYMBOL(pfn_valid); 108 #endif 109 110 #ifndef CONFIG_SPARSEMEM 111 static void arm64_memory_present(void) 112 { 113 } 114 #else 115 static void arm64_memory_present(void) 116 { 117 struct memblock_region *reg; 118 119 for_each_memblock(memory, reg) 120 memory_present(0, memblock_region_memory_base_pfn(reg), 121 memblock_region_memory_end_pfn(reg)); 122 } 123 #endif 124 125 void __init arm64_memblock_init(void) 126 { 127 u64 *reserve_map, base, size; 128 129 /* Register the kernel text, kernel data and initrd with memblock */ 130 memblock_reserve(__pa(_text), _end - _text); 131 #ifdef CONFIG_BLK_DEV_INITRD 132 if (initrd_start) 133 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); 134 #endif 135 136 /* 137 * Reserve the page tables. These are already in use, 138 * and can only be in node 0. 139 */ 140 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); 141 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); 142 143 /* Reserve the dtb region */ 144 memblock_reserve(virt_to_phys(initial_boot_params), 145 be32_to_cpu(initial_boot_params->totalsize)); 146 147 /* 148 * Process the reserve map. This will probably overlap the initrd 149 * and dtb locations which are already reserved, but overlapping 150 * doesn't hurt anything 151 */ 152 reserve_map = ((void*)initial_boot_params) + 153 be32_to_cpu(initial_boot_params->off_mem_rsvmap); 154 while (1) { 155 base = be64_to_cpup(reserve_map++); 156 size = be64_to_cpup(reserve_map++); 157 if (!size) 158 break; 159 memblock_reserve(base, size); 160 } 161 162 memblock_allow_resize(); 163 memblock_dump_all(); 164 } 165 166 void __init bootmem_init(void) 167 { 168 unsigned long min, max; 169 170 min = PFN_UP(memblock_start_of_DRAM()); 171 max = PFN_DOWN(memblock_end_of_DRAM()); 172 173 /* 174 * Sparsemem tries to allocate bootmem in memory_present(), so must be 175 * done after the fixed reservations. 176 */ 177 arm64_memory_present(); 178 179 sparse_init(); 180 zone_sizes_init(min, max); 181 182 high_memory = __va((max << PAGE_SHIFT) - 1) + 1; 183 max_pfn = max_low_pfn = max; 184 } 185 186 #ifndef CONFIG_SPARSEMEM_VMEMMAP 187 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 188 { 189 struct page *start_pg, *end_pg; 190 unsigned long pg, pgend; 191 192 /* 193 * Convert start_pfn/end_pfn to a struct page pointer. 194 */ 195 start_pg = pfn_to_page(start_pfn - 1) + 1; 196 end_pg = pfn_to_page(end_pfn - 1) + 1; 197 198 /* 199 * Convert to physical addresses, and round start upwards and end 200 * downwards. 201 */ 202 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 203 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 204 205 /* 206 * If there are free pages between these, free the section of the 207 * memmap array. 208 */ 209 if (pg < pgend) 210 free_bootmem(pg, pgend - pg); 211 } 212 213 /* 214 * The mem_map array can get very big. Free the unused area of the memory map. 215 */ 216 static void __init free_unused_memmap(void) 217 { 218 unsigned long start, prev_end = 0; 219 struct memblock_region *reg; 220 221 for_each_memblock(memory, reg) { 222 start = __phys_to_pfn(reg->base); 223 224 #ifdef CONFIG_SPARSEMEM 225 /* 226 * Take care not to free memmap entries that don't exist due 227 * to SPARSEMEM sections which aren't present. 228 */ 229 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 230 #endif 231 /* 232 * If we had a previous bank, and there is a space between the 233 * current bank and the previous, free it. 234 */ 235 if (prev_end && prev_end < start) 236 free_memmap(prev_end, start); 237 238 /* 239 * Align up here since the VM subsystem insists that the 240 * memmap entries are valid from the bank end aligned to 241 * MAX_ORDER_NR_PAGES. 242 */ 243 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 244 MAX_ORDER_NR_PAGES); 245 } 246 247 #ifdef CONFIG_SPARSEMEM 248 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 249 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 250 #endif 251 } 252 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 253 254 /* 255 * mem_init() marks the free areas in the mem_map and tells us how much memory 256 * is free. This is done after various parts of the system have claimed their 257 * memory after the kernel image. 258 */ 259 void __init mem_init(void) 260 { 261 arm64_swiotlb_init(); 262 263 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 264 265 #ifndef CONFIG_SPARSEMEM_VMEMMAP 266 free_unused_memmap(); 267 #endif 268 /* this will put all unused low memory onto the freelists */ 269 free_all_bootmem(); 270 271 mem_init_print_info(NULL); 272 273 #define MLK(b, t) b, t, ((t) - (b)) >> 10 274 #define MLM(b, t) b, t, ((t) - (b)) >> 20 275 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 276 277 pr_notice("Virtual kernel memory layout:\n" 278 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" 279 #ifdef CONFIG_SPARSEMEM_VMEMMAP 280 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" 281 #endif 282 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" 283 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" 284 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" 285 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" 286 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", 287 MLM(VMALLOC_START, VMALLOC_END), 288 #ifdef CONFIG_SPARSEMEM_VMEMMAP 289 MLM((unsigned long)virt_to_page(PAGE_OFFSET), 290 (unsigned long)virt_to_page(high_memory)), 291 #endif 292 MLM(MODULES_VADDR, MODULES_END), 293 MLM(PAGE_OFFSET, (unsigned long)high_memory), 294 295 MLK_ROUNDUP(__init_begin, __init_end), 296 MLK_ROUNDUP(_text, _etext), 297 MLK_ROUNDUP(_sdata, _edata)); 298 299 #undef MLK 300 #undef MLM 301 #undef MLK_ROUNDUP 302 303 /* 304 * Check boundaries twice: Some fundamental inconsistencies can be 305 * detected at build time already. 306 */ 307 #ifdef CONFIG_COMPAT 308 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); 309 #endif 310 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 311 BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 312 313 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 314 extern int sysctl_overcommit_memory; 315 /* 316 * On a machine this small we won't get anywhere without 317 * overcommit, so turn it on by default. 318 */ 319 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 320 } 321 } 322 323 void free_initmem(void) 324 { 325 free_initmem_default(0); 326 } 327 328 #ifdef CONFIG_BLK_DEV_INITRD 329 330 static int keep_initrd; 331 332 void free_initrd_mem(unsigned long start, unsigned long end) 333 { 334 if (!keep_initrd) 335 free_reserved_area((void *)start, (void *)end, 0, "initrd"); 336 } 337 338 static int __init keepinitrd_setup(char *__unused) 339 { 340 keep_initrd = 1; 341 return 1; 342 } 343 344 __setup("keepinitrd", keepinitrd_setup); 345 #endif 346