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 phys_addr_t dma_phys_limit = 0; 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 early_init_fdt_scan_reserved_mem(); 146 147 /* 4GB maximum for 32-bit only capable devices */ 148 if (IS_ENABLED(CONFIG_ZONE_DMA)) 149 dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1; 150 dma_contiguous_reserve(dma_phys_limit); 151 152 memblock_allow_resize(); 153 memblock_dump_all(); 154 } 155 156 void __init bootmem_init(void) 157 { 158 unsigned long min, max; 159 160 min = PFN_UP(memblock_start_of_DRAM()); 161 max = PFN_DOWN(memblock_end_of_DRAM()); 162 163 /* 164 * Sparsemem tries to allocate bootmem in memory_present(), so must be 165 * done after the fixed reservations. 166 */ 167 arm64_memory_present(); 168 169 sparse_init(); 170 zone_sizes_init(min, max); 171 172 high_memory = __va((max << PAGE_SHIFT) - 1) + 1; 173 max_pfn = max_low_pfn = max; 174 } 175 176 #ifndef CONFIG_SPARSEMEM_VMEMMAP 177 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 178 { 179 struct page *start_pg, *end_pg; 180 unsigned long pg, pgend; 181 182 /* 183 * Convert start_pfn/end_pfn to a struct page pointer. 184 */ 185 start_pg = pfn_to_page(start_pfn - 1) + 1; 186 end_pg = pfn_to_page(end_pfn - 1) + 1; 187 188 /* 189 * Convert to physical addresses, and round start upwards and end 190 * downwards. 191 */ 192 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 193 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 194 195 /* 196 * If there are free pages between these, free the section of the 197 * memmap array. 198 */ 199 if (pg < pgend) 200 free_bootmem(pg, pgend - pg); 201 } 202 203 /* 204 * The mem_map array can get very big. Free the unused area of the memory map. 205 */ 206 static void __init free_unused_memmap(void) 207 { 208 unsigned long start, prev_end = 0; 209 struct memblock_region *reg; 210 211 for_each_memblock(memory, reg) { 212 start = __phys_to_pfn(reg->base); 213 214 #ifdef CONFIG_SPARSEMEM 215 /* 216 * Take care not to free memmap entries that don't exist due 217 * to SPARSEMEM sections which aren't present. 218 */ 219 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 220 #endif 221 /* 222 * If we had a previous bank, and there is a space between the 223 * current bank and the previous, free it. 224 */ 225 if (prev_end && prev_end < start) 226 free_memmap(prev_end, start); 227 228 /* 229 * Align up here since the VM subsystem insists that the 230 * memmap entries are valid from the bank end aligned to 231 * MAX_ORDER_NR_PAGES. 232 */ 233 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 234 MAX_ORDER_NR_PAGES); 235 } 236 237 #ifdef CONFIG_SPARSEMEM 238 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 239 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 240 #endif 241 } 242 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 243 244 /* 245 * mem_init() marks the free areas in the mem_map and tells us how much memory 246 * is free. This is done after various parts of the system have claimed their 247 * memory after the kernel image. 248 */ 249 void __init mem_init(void) 250 { 251 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 252 253 #ifndef CONFIG_SPARSEMEM_VMEMMAP 254 free_unused_memmap(); 255 #endif 256 /* this will put all unused low memory onto the freelists */ 257 free_all_bootmem(); 258 259 mem_init_print_info(NULL); 260 261 #define MLK(b, t) b, t, ((t) - (b)) >> 10 262 #define MLM(b, t) b, t, ((t) - (b)) >> 20 263 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 264 265 pr_notice("Virtual kernel memory layout:\n" 266 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" 267 #ifdef CONFIG_SPARSEMEM_VMEMMAP 268 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" 269 #endif 270 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" 271 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" 272 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" 273 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" 274 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", 275 MLM(VMALLOC_START, VMALLOC_END), 276 #ifdef CONFIG_SPARSEMEM_VMEMMAP 277 MLM((unsigned long)virt_to_page(PAGE_OFFSET), 278 (unsigned long)virt_to_page(high_memory)), 279 #endif 280 MLM(MODULES_VADDR, MODULES_END), 281 MLM(PAGE_OFFSET, (unsigned long)high_memory), 282 283 MLK_ROUNDUP(__init_begin, __init_end), 284 MLK_ROUNDUP(_text, _etext), 285 MLK_ROUNDUP(_sdata, _edata)); 286 287 #undef MLK 288 #undef MLM 289 #undef MLK_ROUNDUP 290 291 /* 292 * Check boundaries twice: Some fundamental inconsistencies can be 293 * detected at build time already. 294 */ 295 #ifdef CONFIG_COMPAT 296 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); 297 #endif 298 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 299 BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 300 301 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 302 extern int sysctl_overcommit_memory; 303 /* 304 * On a machine this small we won't get anywhere without 305 * overcommit, so turn it on by default. 306 */ 307 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 308 } 309 } 310 311 void free_initmem(void) 312 { 313 free_initmem_default(0); 314 } 315 316 #ifdef CONFIG_BLK_DEV_INITRD 317 318 static int keep_initrd; 319 320 void free_initrd_mem(unsigned long start, unsigned long end) 321 { 322 if (!keep_initrd) 323 free_reserved_area((void *)start, (void *)end, 0, "initrd"); 324 } 325 326 static int __init keepinitrd_setup(char *__unused) 327 { 328 keep_initrd = 1; 329 return 1; 330 } 331 332 __setup("keepinitrd", keepinitrd_setup); 333 #endif 334