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 #include <linux/dma-mapping.h> 34 #include <linux/dma-contiguous.h> 35 36 #include <asm/sections.h> 37 #include <asm/setup.h> 38 #include <asm/sizes.h> 39 #include <asm/tlb.h> 40 41 #include "mm.h" 42 43 phys_addr_t memstart_addr __read_mostly = 0; 44 45 #ifdef CONFIG_BLK_DEV_INITRD 46 static int __init early_initrd(char *p) 47 { 48 unsigned long start, size; 49 char *endp; 50 51 start = memparse(p, &endp); 52 if (*endp == ',') { 53 size = memparse(endp + 1, NULL); 54 55 initrd_start = (unsigned long)__va(start); 56 initrd_end = (unsigned long)__va(start + size); 57 } 58 return 0; 59 } 60 early_param("initrd", early_initrd); 61 #endif 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_dma = min; 68 69 memset(zone_size, 0, sizeof(zone_size)); 70 71 /* 4GB maximum for 32-bit only capable devices */ 72 if (IS_ENABLED(CONFIG_ZONE_DMA)) { 73 unsigned long max_dma_phys = 74 (unsigned long)dma_to_phys(NULL, DMA_BIT_MASK(32) + 1); 75 max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT)); 76 zone_size[ZONE_DMA] = max_dma - min; 77 } 78 zone_size[ZONE_NORMAL] = max - max_dma; 79 80 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 81 82 for_each_memblock(memory, reg) { 83 unsigned long start = memblock_region_memory_base_pfn(reg); 84 unsigned long end = memblock_region_memory_end_pfn(reg); 85 86 if (start >= max) 87 continue; 88 89 if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) { 90 unsigned long dma_end = min(end, max_dma); 91 zhole_size[ZONE_DMA] -= dma_end - start; 92 } 93 94 if (end > max_dma) { 95 unsigned long normal_end = min(end, max); 96 unsigned long normal_start = max(start, max_dma); 97 zhole_size[ZONE_NORMAL] -= normal_end - normal_start; 98 } 99 } 100 101 free_area_init_node(0, zone_size, min, zhole_size); 102 } 103 104 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 105 int pfn_valid(unsigned long pfn) 106 { 107 return memblock_is_memory(pfn << PAGE_SHIFT); 108 } 109 EXPORT_SYMBOL(pfn_valid); 110 #endif 111 112 #ifndef CONFIG_SPARSEMEM 113 static void arm64_memory_present(void) 114 { 115 } 116 #else 117 static void arm64_memory_present(void) 118 { 119 struct memblock_region *reg; 120 121 for_each_memblock(memory, reg) 122 memory_present(0, memblock_region_memory_base_pfn(reg), 123 memblock_region_memory_end_pfn(reg)); 124 } 125 #endif 126 127 void __init arm64_memblock_init(void) 128 { 129 u64 *reserve_map, base, size; 130 131 /* Register the kernel text, kernel data and initrd with memblock */ 132 memblock_reserve(__pa(_text), _end - _text); 133 #ifdef CONFIG_BLK_DEV_INITRD 134 if (initrd_start) 135 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); 136 #endif 137 138 /* 139 * Reserve the page tables. These are already in use, 140 * and can only be in node 0. 141 */ 142 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); 143 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); 144 145 /* Reserve the dtb region */ 146 memblock_reserve(virt_to_phys(initial_boot_params), 147 be32_to_cpu(initial_boot_params->totalsize)); 148 149 /* 150 * Process the reserve map. This will probably overlap the initrd 151 * and dtb locations which are already reserved, but overlapping 152 * doesn't hurt anything 153 */ 154 reserve_map = ((void*)initial_boot_params) + 155 be32_to_cpu(initial_boot_params->off_mem_rsvmap); 156 while (1) { 157 base = be64_to_cpup(reserve_map++); 158 size = be64_to_cpup(reserve_map++); 159 if (!size) 160 break; 161 memblock_reserve(base, size); 162 } 163 164 early_init_fdt_scan_reserved_mem(); 165 dma_contiguous_reserve(0); 166 167 memblock_allow_resize(); 168 memblock_dump_all(); 169 } 170 171 void __init bootmem_init(void) 172 { 173 unsigned long min, max; 174 175 min = PFN_UP(memblock_start_of_DRAM()); 176 max = PFN_DOWN(memblock_end_of_DRAM()); 177 178 /* 179 * Sparsemem tries to allocate bootmem in memory_present(), so must be 180 * done after the fixed reservations. 181 */ 182 arm64_memory_present(); 183 184 sparse_init(); 185 zone_sizes_init(min, max); 186 187 high_memory = __va((max << PAGE_SHIFT) - 1) + 1; 188 max_pfn = max_low_pfn = max; 189 } 190 191 #ifndef CONFIG_SPARSEMEM_VMEMMAP 192 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 193 { 194 struct page *start_pg, *end_pg; 195 unsigned long pg, pgend; 196 197 /* 198 * Convert start_pfn/end_pfn to a struct page pointer. 199 */ 200 start_pg = pfn_to_page(start_pfn - 1) + 1; 201 end_pg = pfn_to_page(end_pfn - 1) + 1; 202 203 /* 204 * Convert to physical addresses, and round start upwards and end 205 * downwards. 206 */ 207 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 208 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 209 210 /* 211 * If there are free pages between these, free the section of the 212 * memmap array. 213 */ 214 if (pg < pgend) 215 free_bootmem(pg, pgend - pg); 216 } 217 218 /* 219 * The mem_map array can get very big. Free the unused area of the memory map. 220 */ 221 static void __init free_unused_memmap(void) 222 { 223 unsigned long start, prev_end = 0; 224 struct memblock_region *reg; 225 226 for_each_memblock(memory, reg) { 227 start = __phys_to_pfn(reg->base); 228 229 #ifdef CONFIG_SPARSEMEM 230 /* 231 * Take care not to free memmap entries that don't exist due 232 * to SPARSEMEM sections which aren't present. 233 */ 234 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 235 #endif 236 /* 237 * If we had a previous bank, and there is a space between the 238 * current bank and the previous, free it. 239 */ 240 if (prev_end && prev_end < start) 241 free_memmap(prev_end, start); 242 243 /* 244 * Align up here since the VM subsystem insists that the 245 * memmap entries are valid from the bank end aligned to 246 * MAX_ORDER_NR_PAGES. 247 */ 248 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 249 MAX_ORDER_NR_PAGES); 250 } 251 252 #ifdef CONFIG_SPARSEMEM 253 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 254 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 255 #endif 256 } 257 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 258 259 /* 260 * mem_init() marks the free areas in the mem_map and tells us how much memory 261 * is free. This is done after various parts of the system have claimed their 262 * memory after the kernel image. 263 */ 264 void __init mem_init(void) 265 { 266 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 267 268 #ifndef CONFIG_SPARSEMEM_VMEMMAP 269 free_unused_memmap(); 270 #endif 271 /* this will put all unused low memory onto the freelists */ 272 free_all_bootmem(); 273 274 mem_init_print_info(NULL); 275 276 #define MLK(b, t) b, t, ((t) - (b)) >> 10 277 #define MLM(b, t) b, t, ((t) - (b)) >> 20 278 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 279 280 pr_notice("Virtual kernel memory layout:\n" 281 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" 282 #ifdef CONFIG_SPARSEMEM_VMEMMAP 283 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" 284 #endif 285 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" 286 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" 287 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" 288 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" 289 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", 290 MLM(VMALLOC_START, VMALLOC_END), 291 #ifdef CONFIG_SPARSEMEM_VMEMMAP 292 MLM((unsigned long)virt_to_page(PAGE_OFFSET), 293 (unsigned long)virt_to_page(high_memory)), 294 #endif 295 MLM(MODULES_VADDR, MODULES_END), 296 MLM(PAGE_OFFSET, (unsigned long)high_memory), 297 298 MLK_ROUNDUP(__init_begin, __init_end), 299 MLK_ROUNDUP(_text, _etext), 300 MLK_ROUNDUP(_sdata, _edata)); 301 302 #undef MLK 303 #undef MLM 304 #undef MLK_ROUNDUP 305 306 /* 307 * Check boundaries twice: Some fundamental inconsistencies can be 308 * detected at build time already. 309 */ 310 #ifdef CONFIG_COMPAT 311 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); 312 #endif 313 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 314 BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 315 316 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 317 extern int sysctl_overcommit_memory; 318 /* 319 * On a machine this small we won't get anywhere without 320 * overcommit, so turn it on by default. 321 */ 322 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 323 } 324 } 325 326 void free_initmem(void) 327 { 328 free_initmem_default(0); 329 } 330 331 #ifdef CONFIG_BLK_DEV_INITRD 332 333 static int keep_initrd; 334 335 void free_initrd_mem(unsigned long start, unsigned long end) 336 { 337 if (!keep_initrd) 338 free_reserved_area((void *)start, (void *)end, 0, "initrd"); 339 } 340 341 static int __init keepinitrd_setup(char *__unused) 342 { 343 keep_initrd = 1; 344 return 1; 345 } 346 347 __setup("keepinitrd", keepinitrd_setup); 348 #endif 349