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 /* 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 early_init_fdt_scan_reserved_mem(); 144 dma_contiguous_reserve(0); 145 146 memblock_allow_resize(); 147 memblock_dump_all(); 148 } 149 150 void __init bootmem_init(void) 151 { 152 unsigned long min, max; 153 154 min = PFN_UP(memblock_start_of_DRAM()); 155 max = PFN_DOWN(memblock_end_of_DRAM()); 156 157 /* 158 * Sparsemem tries to allocate bootmem in memory_present(), so must be 159 * done after the fixed reservations. 160 */ 161 arm64_memory_present(); 162 163 sparse_init(); 164 zone_sizes_init(min, max); 165 166 high_memory = __va((max << PAGE_SHIFT) - 1) + 1; 167 max_pfn = max_low_pfn = max; 168 } 169 170 #ifndef CONFIG_SPARSEMEM_VMEMMAP 171 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 172 { 173 struct page *start_pg, *end_pg; 174 unsigned long pg, pgend; 175 176 /* 177 * Convert start_pfn/end_pfn to a struct page pointer. 178 */ 179 start_pg = pfn_to_page(start_pfn - 1) + 1; 180 end_pg = pfn_to_page(end_pfn - 1) + 1; 181 182 /* 183 * Convert to physical addresses, and round start upwards and end 184 * downwards. 185 */ 186 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 187 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 188 189 /* 190 * If there are free pages between these, free the section of the 191 * memmap array. 192 */ 193 if (pg < pgend) 194 free_bootmem(pg, pgend - pg); 195 } 196 197 /* 198 * The mem_map array can get very big. Free the unused area of the memory map. 199 */ 200 static void __init free_unused_memmap(void) 201 { 202 unsigned long start, prev_end = 0; 203 struct memblock_region *reg; 204 205 for_each_memblock(memory, reg) { 206 start = __phys_to_pfn(reg->base); 207 208 #ifdef CONFIG_SPARSEMEM 209 /* 210 * Take care not to free memmap entries that don't exist due 211 * to SPARSEMEM sections which aren't present. 212 */ 213 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 214 #endif 215 /* 216 * If we had a previous bank, and there is a space between the 217 * current bank and the previous, free it. 218 */ 219 if (prev_end && prev_end < start) 220 free_memmap(prev_end, start); 221 222 /* 223 * Align up here since the VM subsystem insists that the 224 * memmap entries are valid from the bank end aligned to 225 * MAX_ORDER_NR_PAGES. 226 */ 227 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 228 MAX_ORDER_NR_PAGES); 229 } 230 231 #ifdef CONFIG_SPARSEMEM 232 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 233 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 234 #endif 235 } 236 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 237 238 /* 239 * mem_init() marks the free areas in the mem_map and tells us how much memory 240 * is free. This is done after various parts of the system have claimed their 241 * memory after the kernel image. 242 */ 243 void __init mem_init(void) 244 { 245 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 246 247 #ifndef CONFIG_SPARSEMEM_VMEMMAP 248 free_unused_memmap(); 249 #endif 250 /* this will put all unused low memory onto the freelists */ 251 free_all_bootmem(); 252 253 mem_init_print_info(NULL); 254 255 #define MLK(b, t) b, t, ((t) - (b)) >> 10 256 #define MLM(b, t) b, t, ((t) - (b)) >> 20 257 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 258 259 pr_notice("Virtual kernel memory layout:\n" 260 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" 261 #ifdef CONFIG_SPARSEMEM_VMEMMAP 262 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" 263 #endif 264 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" 265 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" 266 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" 267 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" 268 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", 269 MLM(VMALLOC_START, VMALLOC_END), 270 #ifdef CONFIG_SPARSEMEM_VMEMMAP 271 MLM((unsigned long)virt_to_page(PAGE_OFFSET), 272 (unsigned long)virt_to_page(high_memory)), 273 #endif 274 MLM(MODULES_VADDR, MODULES_END), 275 MLM(PAGE_OFFSET, (unsigned long)high_memory), 276 277 MLK_ROUNDUP(__init_begin, __init_end), 278 MLK_ROUNDUP(_text, _etext), 279 MLK_ROUNDUP(_sdata, _edata)); 280 281 #undef MLK 282 #undef MLM 283 #undef MLK_ROUNDUP 284 285 /* 286 * Check boundaries twice: Some fundamental inconsistencies can be 287 * detected at build time already. 288 */ 289 #ifdef CONFIG_COMPAT 290 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); 291 #endif 292 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 293 BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 294 295 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 296 extern int sysctl_overcommit_memory; 297 /* 298 * On a machine this small we won't get anywhere without 299 * overcommit, so turn it on by default. 300 */ 301 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 302 } 303 } 304 305 void free_initmem(void) 306 { 307 free_initmem_default(0); 308 } 309 310 #ifdef CONFIG_BLK_DEV_INITRD 311 312 static int keep_initrd; 313 314 void free_initrd_mem(unsigned long start, unsigned long end) 315 { 316 if (!keep_initrd) 317 free_reserved_area((void *)start, (void *)end, 0, "initrd"); 318 } 319 320 static int __init keepinitrd_setup(char *__unused) 321 { 322 keep_initrd = 1; 323 return 1; 324 } 325 326 __setup("keepinitrd", keepinitrd_setup); 327 #endif 328