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-contiguous.h> 34 35 #include <asm/sections.h> 36 #include <asm/setup.h> 37 #include <asm/sizes.h> 38 #include <asm/tlb.h> 39 40 #include "mm.h" 41 42 phys_addr_t memstart_addr __read_mostly = 0; 43 44 #ifdef CONFIG_BLK_DEV_INITRD 45 static int __init early_initrd(char *p) 46 { 47 unsigned long start, size; 48 char *endp; 49 50 start = memparse(p, &endp); 51 if (*endp == ',') { 52 size = memparse(endp + 1, NULL); 53 54 initrd_start = (unsigned long)__va(start); 55 initrd_end = (unsigned long)__va(start + size); 56 } 57 return 0; 58 } 59 early_param("initrd", early_initrd); 60 #endif 61 62 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) 63 64 static void __init zone_sizes_init(unsigned long min, unsigned long max) 65 { 66 struct memblock_region *reg; 67 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 68 unsigned long max_dma32 = min; 69 70 memset(zone_size, 0, sizeof(zone_size)); 71 72 #ifdef CONFIG_ZONE_DMA32 73 /* 4GB maximum for 32-bit only capable devices */ 74 max_dma32 = max(min, min(max, MAX_DMA32_PFN)); 75 zone_size[ZONE_DMA32] = max_dma32 - min; 76 #endif 77 zone_size[ZONE_NORMAL] = max - max_dma32; 78 79 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 80 81 for_each_memblock(memory, reg) { 82 unsigned long start = memblock_region_memory_base_pfn(reg); 83 unsigned long end = memblock_region_memory_end_pfn(reg); 84 85 if (start >= max) 86 continue; 87 #ifdef CONFIG_ZONE_DMA32 88 if (start < max_dma32) { 89 unsigned long dma_end = min(end, max_dma32); 90 zhole_size[ZONE_DMA32] -= dma_end - start; 91 } 92 #endif 93 if (end > max_dma32) { 94 unsigned long normal_end = min(end, max); 95 unsigned long normal_start = max(start, max_dma32); 96 zhole_size[ZONE_NORMAL] -= normal_end - normal_start; 97 } 98 } 99 100 free_area_init_node(0, zone_size, min, zhole_size); 101 } 102 103 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 104 int pfn_valid(unsigned long pfn) 105 { 106 return memblock_is_memory(pfn << PAGE_SHIFT); 107 } 108 EXPORT_SYMBOL(pfn_valid); 109 #endif 110 111 #ifndef CONFIG_SPARSEMEM 112 static void arm64_memory_present(void) 113 { 114 } 115 #else 116 static void arm64_memory_present(void) 117 { 118 struct memblock_region *reg; 119 120 for_each_memblock(memory, reg) 121 memory_present(0, memblock_region_memory_base_pfn(reg), 122 memblock_region_memory_end_pfn(reg)); 123 } 124 #endif 125 126 void __init arm64_memblock_init(void) 127 { 128 u64 *reserve_map, base, size; 129 130 /* Register the kernel text, kernel data and initrd with memblock */ 131 memblock_reserve(__pa(_text), _end - _text); 132 #ifdef CONFIG_BLK_DEV_INITRD 133 if (initrd_start) 134 memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start); 135 #endif 136 137 /* 138 * Reserve the page tables. These are already in use, 139 * and can only be in node 0. 140 */ 141 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); 142 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); 143 144 /* Reserve the dtb region */ 145 memblock_reserve(virt_to_phys(initial_boot_params), 146 be32_to_cpu(initial_boot_params->totalsize)); 147 148 /* 149 * Process the reserve map. This will probably overlap the initrd 150 * and dtb locations which are already reserved, but overlapping 151 * doesn't hurt anything 152 */ 153 reserve_map = ((void*)initial_boot_params) + 154 be32_to_cpu(initial_boot_params->off_mem_rsvmap); 155 while (1) { 156 base = be64_to_cpup(reserve_map++); 157 size = be64_to_cpup(reserve_map++); 158 if (!size) 159 break; 160 memblock_reserve(base, size); 161 } 162 163 dma_contiguous_reserve(0); 164 165 memblock_allow_resize(); 166 memblock_dump_all(); 167 } 168 169 void __init bootmem_init(void) 170 { 171 unsigned long min, max; 172 173 min = PFN_UP(memblock_start_of_DRAM()); 174 max = PFN_DOWN(memblock_end_of_DRAM()); 175 176 /* 177 * Sparsemem tries to allocate bootmem in memory_present(), so must be 178 * done after the fixed reservations. 179 */ 180 arm64_memory_present(); 181 182 sparse_init(); 183 zone_sizes_init(min, max); 184 185 high_memory = __va((max << PAGE_SHIFT) - 1) + 1; 186 max_pfn = max_low_pfn = max; 187 } 188 189 #ifndef CONFIG_SPARSEMEM_VMEMMAP 190 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 191 { 192 struct page *start_pg, *end_pg; 193 unsigned long pg, pgend; 194 195 /* 196 * Convert start_pfn/end_pfn to a struct page pointer. 197 */ 198 start_pg = pfn_to_page(start_pfn - 1) + 1; 199 end_pg = pfn_to_page(end_pfn - 1) + 1; 200 201 /* 202 * Convert to physical addresses, and round start upwards and end 203 * downwards. 204 */ 205 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 206 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 207 208 /* 209 * If there are free pages between these, free the section of the 210 * memmap array. 211 */ 212 if (pg < pgend) 213 free_bootmem(pg, pgend - pg); 214 } 215 216 /* 217 * The mem_map array can get very big. Free the unused area of the memory map. 218 */ 219 static void __init free_unused_memmap(void) 220 { 221 unsigned long start, prev_end = 0; 222 struct memblock_region *reg; 223 224 for_each_memblock(memory, reg) { 225 start = __phys_to_pfn(reg->base); 226 227 #ifdef CONFIG_SPARSEMEM 228 /* 229 * Take care not to free memmap entries that don't exist due 230 * to SPARSEMEM sections which aren't present. 231 */ 232 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 233 #endif 234 /* 235 * If we had a previous bank, and there is a space between the 236 * current bank and the previous, free it. 237 */ 238 if (prev_end && prev_end < start) 239 free_memmap(prev_end, start); 240 241 /* 242 * Align up here since the VM subsystem insists that the 243 * memmap entries are valid from the bank end aligned to 244 * MAX_ORDER_NR_PAGES. 245 */ 246 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 247 MAX_ORDER_NR_PAGES); 248 } 249 250 #ifdef CONFIG_SPARSEMEM 251 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 252 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 253 #endif 254 } 255 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 256 257 /* 258 * mem_init() marks the free areas in the mem_map and tells us how much memory 259 * is free. This is done after various parts of the system have claimed their 260 * memory after the kernel image. 261 */ 262 void __init mem_init(void) 263 { 264 arm64_swiotlb_init(); 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