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/prom.h> 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 static unsigned long phys_initrd_start __initdata = 0; 43 static unsigned long phys_initrd_size __initdata = 0; 44 45 phys_addr_t memstart_addr __read_mostly = 0; 46 47 void __init early_init_dt_setup_initrd_arch(unsigned long start, 48 unsigned long end) 49 { 50 phys_initrd_start = start; 51 phys_initrd_size = end - start; 52 } 53 54 static int __init early_initrd(char *p) 55 { 56 unsigned long start, size; 57 char *endp; 58 59 start = memparse(p, &endp); 60 if (*endp == ',') { 61 size = memparse(endp + 1, NULL); 62 63 phys_initrd_start = start; 64 phys_initrd_size = size; 65 } 66 return 0; 67 } 68 early_param("initrd", early_initrd); 69 70 #define MAX_DMA32_PFN ((4UL * 1024 * 1024 * 1024) >> PAGE_SHIFT) 71 72 static void __init zone_sizes_init(unsigned long min, unsigned long max) 73 { 74 struct memblock_region *reg; 75 unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES]; 76 unsigned long max_dma32 = min; 77 78 memset(zone_size, 0, sizeof(zone_size)); 79 80 #ifdef CONFIG_ZONE_DMA32 81 /* 4GB maximum for 32-bit only capable devices */ 82 max_dma32 = max(min, min(max, MAX_DMA32_PFN)); 83 zone_size[ZONE_DMA32] = max_dma32 - min; 84 #endif 85 zone_size[ZONE_NORMAL] = max - max_dma32; 86 87 memcpy(zhole_size, zone_size, sizeof(zhole_size)); 88 89 for_each_memblock(memory, reg) { 90 unsigned long start = memblock_region_memory_base_pfn(reg); 91 unsigned long end = memblock_region_memory_end_pfn(reg); 92 93 if (start >= max) 94 continue; 95 #ifdef CONFIG_ZONE_DMA32 96 if (start < max_dma32) { 97 unsigned long dma_end = min(end, max_dma32); 98 zhole_size[ZONE_DMA32] -= dma_end - start; 99 } 100 #endif 101 if (end > max_dma32) { 102 unsigned long normal_end = min(end, max); 103 unsigned long normal_start = max(start, max_dma32); 104 zhole_size[ZONE_NORMAL] -= normal_end - normal_start; 105 } 106 } 107 108 free_area_init_node(0, zone_size, min, zhole_size); 109 } 110 111 #ifdef CONFIG_HAVE_ARCH_PFN_VALID 112 int pfn_valid(unsigned long pfn) 113 { 114 return memblock_is_memory(pfn << PAGE_SHIFT); 115 } 116 EXPORT_SYMBOL(pfn_valid); 117 #endif 118 119 #ifndef CONFIG_SPARSEMEM 120 static void arm64_memory_present(void) 121 { 122 } 123 #else 124 static void arm64_memory_present(void) 125 { 126 struct memblock_region *reg; 127 128 for_each_memblock(memory, reg) 129 memory_present(0, memblock_region_memory_base_pfn(reg), 130 memblock_region_memory_end_pfn(reg)); 131 } 132 #endif 133 134 void __init arm64_memblock_init(void) 135 { 136 u64 *reserve_map, base, size; 137 138 /* Register the kernel text, kernel data and initrd with memblock */ 139 memblock_reserve(__pa(_text), _end - _text); 140 #ifdef CONFIG_BLK_DEV_INITRD 141 if (phys_initrd_size) { 142 memblock_reserve(phys_initrd_start, phys_initrd_size); 143 144 /* Now convert initrd to virtual addresses */ 145 initrd_start = __phys_to_virt(phys_initrd_start); 146 initrd_end = initrd_start + phys_initrd_size; 147 } 148 #endif 149 150 /* 151 * Reserve the page tables. These are already in use, 152 * and can only be in node 0. 153 */ 154 memblock_reserve(__pa(swapper_pg_dir), SWAPPER_DIR_SIZE); 155 memblock_reserve(__pa(idmap_pg_dir), IDMAP_DIR_SIZE); 156 157 /* Reserve the dtb region */ 158 memblock_reserve(virt_to_phys(initial_boot_params), 159 be32_to_cpu(initial_boot_params->totalsize)); 160 161 /* 162 * Process the reserve map. This will probably overlap the initrd 163 * and dtb locations which are already reserved, but overlapping 164 * doesn't hurt anything 165 */ 166 reserve_map = ((void*)initial_boot_params) + 167 be32_to_cpu(initial_boot_params->off_mem_rsvmap); 168 while (1) { 169 base = be64_to_cpup(reserve_map++); 170 size = be64_to_cpup(reserve_map++); 171 if (!size) 172 break; 173 memblock_reserve(base, size); 174 } 175 176 memblock_allow_resize(); 177 memblock_dump_all(); 178 } 179 180 void __init bootmem_init(void) 181 { 182 unsigned long min, max; 183 184 min = PFN_UP(memblock_start_of_DRAM()); 185 max = PFN_DOWN(memblock_end_of_DRAM()); 186 187 /* 188 * Sparsemem tries to allocate bootmem in memory_present(), so must be 189 * done after the fixed reservations. 190 */ 191 arm64_memory_present(); 192 193 sparse_init(); 194 zone_sizes_init(min, max); 195 196 high_memory = __va((max << PAGE_SHIFT) - 1) + 1; 197 max_pfn = max_low_pfn = max; 198 } 199 200 #ifndef CONFIG_SPARSEMEM_VMEMMAP 201 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 202 { 203 struct page *start_pg, *end_pg; 204 unsigned long pg, pgend; 205 206 /* 207 * Convert start_pfn/end_pfn to a struct page pointer. 208 */ 209 start_pg = pfn_to_page(start_pfn - 1) + 1; 210 end_pg = pfn_to_page(end_pfn - 1) + 1; 211 212 /* 213 * Convert to physical addresses, and round start upwards and end 214 * downwards. 215 */ 216 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 217 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 218 219 /* 220 * If there are free pages between these, free the section of the 221 * memmap array. 222 */ 223 if (pg < pgend) 224 free_bootmem(pg, pgend - pg); 225 } 226 227 /* 228 * The mem_map array can get very big. Free the unused area of the memory map. 229 */ 230 static void __init free_unused_memmap(void) 231 { 232 unsigned long start, prev_end = 0; 233 struct memblock_region *reg; 234 235 for_each_memblock(memory, reg) { 236 start = __phys_to_pfn(reg->base); 237 238 #ifdef CONFIG_SPARSEMEM 239 /* 240 * Take care not to free memmap entries that don't exist due 241 * to SPARSEMEM sections which aren't present. 242 */ 243 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 244 #endif 245 /* 246 * If we had a previous bank, and there is a space between the 247 * current bank and the previous, free it. 248 */ 249 if (prev_end && prev_end < start) 250 free_memmap(prev_end, start); 251 252 /* 253 * Align up here since the VM subsystem insists that the 254 * memmap entries are valid from the bank end aligned to 255 * MAX_ORDER_NR_PAGES. 256 */ 257 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 258 MAX_ORDER_NR_PAGES); 259 } 260 261 #ifdef CONFIG_SPARSEMEM 262 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 263 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 264 #endif 265 } 266 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 267 268 /* 269 * mem_init() marks the free areas in the mem_map and tells us how much memory 270 * is free. This is done after various parts of the system have claimed their 271 * memory after the kernel image. 272 */ 273 void __init mem_init(void) 274 { 275 arm64_swiotlb_init(); 276 277 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 278 279 #ifndef CONFIG_SPARSEMEM_VMEMMAP 280 free_unused_memmap(); 281 #endif 282 /* this will put all unused low memory onto the freelists */ 283 free_all_bootmem(); 284 285 mem_init_print_info(NULL); 286 287 #define MLK(b, t) b, t, ((t) - (b)) >> 10 288 #define MLM(b, t) b, t, ((t) - (b)) >> 20 289 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 290 291 pr_notice("Virtual kernel memory layout:\n" 292 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" 293 #ifdef CONFIG_SPARSEMEM_VMEMMAP 294 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" 295 #endif 296 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" 297 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" 298 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" 299 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" 300 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", 301 MLM(VMALLOC_START, VMALLOC_END), 302 #ifdef CONFIG_SPARSEMEM_VMEMMAP 303 MLM((unsigned long)virt_to_page(PAGE_OFFSET), 304 (unsigned long)virt_to_page(high_memory)), 305 #endif 306 MLM(MODULES_VADDR, MODULES_END), 307 MLM(PAGE_OFFSET, (unsigned long)high_memory), 308 309 MLK_ROUNDUP(__init_begin, __init_end), 310 MLK_ROUNDUP(_text, _etext), 311 MLK_ROUNDUP(_sdata, _edata)); 312 313 #undef MLK 314 #undef MLM 315 #undef MLK_ROUNDUP 316 317 /* 318 * Check boundaries twice: Some fundamental inconsistencies can be 319 * detected at build time already. 320 */ 321 #ifdef CONFIG_COMPAT 322 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); 323 #endif 324 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 325 BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 326 327 if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) { 328 extern int sysctl_overcommit_memory; 329 /* 330 * On a machine this small we won't get anywhere without 331 * overcommit, so turn it on by default. 332 */ 333 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 334 } 335 } 336 337 void free_initmem(void) 338 { 339 free_initmem_default(0); 340 } 341 342 #ifdef CONFIG_BLK_DEV_INITRD 343 344 static int keep_initrd; 345 346 void free_initrd_mem(unsigned long start, unsigned long end) 347 { 348 if (!keep_initrd) 349 free_reserved_area((void *)start, (void *)end, 0, "initrd"); 350 } 351 352 static int __init keepinitrd_setup(char *__unused) 353 { 354 keep_initrd = 1; 355 return 1; 356 } 357 358 __setup("keepinitrd", keepinitrd_setup); 359 #endif 360