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