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 /* 201 * Poison init memory with an undefined instruction (0x0). 202 */ 203 static inline void poison_init_mem(void *s, size_t count) 204 { 205 memset(s, 0, count); 206 } 207 208 #ifndef CONFIG_SPARSEMEM_VMEMMAP 209 static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn) 210 { 211 struct page *start_pg, *end_pg; 212 unsigned long pg, pgend; 213 214 /* 215 * Convert start_pfn/end_pfn to a struct page pointer. 216 */ 217 start_pg = pfn_to_page(start_pfn - 1) + 1; 218 end_pg = pfn_to_page(end_pfn - 1) + 1; 219 220 /* 221 * Convert to physical addresses, and round start upwards and end 222 * downwards. 223 */ 224 pg = (unsigned long)PAGE_ALIGN(__pa(start_pg)); 225 pgend = (unsigned long)__pa(end_pg) & PAGE_MASK; 226 227 /* 228 * If there are free pages between these, free the section of the 229 * memmap array. 230 */ 231 if (pg < pgend) 232 free_bootmem(pg, pgend - pg); 233 } 234 235 /* 236 * The mem_map array can get very big. Free the unused area of the memory map. 237 */ 238 static void __init free_unused_memmap(void) 239 { 240 unsigned long start, prev_end = 0; 241 struct memblock_region *reg; 242 243 for_each_memblock(memory, reg) { 244 start = __phys_to_pfn(reg->base); 245 246 #ifdef CONFIG_SPARSEMEM 247 /* 248 * Take care not to free memmap entries that don't exist due 249 * to SPARSEMEM sections which aren't present. 250 */ 251 start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); 252 #endif 253 /* 254 * If we had a previous bank, and there is a space between the 255 * current bank and the previous, free it. 256 */ 257 if (prev_end && prev_end < start) 258 free_memmap(prev_end, start); 259 260 /* 261 * Align up here since the VM subsystem insists that the 262 * memmap entries are valid from the bank end aligned to 263 * MAX_ORDER_NR_PAGES. 264 */ 265 prev_end = ALIGN(start + __phys_to_pfn(reg->size), 266 MAX_ORDER_NR_PAGES); 267 } 268 269 #ifdef CONFIG_SPARSEMEM 270 if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) 271 free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); 272 #endif 273 } 274 #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ 275 276 /* 277 * mem_init() marks the free areas in the mem_map and tells us how much memory 278 * is free. This is done after various parts of the system have claimed their 279 * memory after the kernel image. 280 */ 281 void __init mem_init(void) 282 { 283 unsigned long reserved_pages, free_pages; 284 struct memblock_region *reg; 285 286 arm64_swiotlb_init(); 287 288 max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map; 289 290 #ifndef CONFIG_SPARSEMEM_VMEMMAP 291 /* this will put all unused low memory onto the freelists */ 292 free_unused_memmap(); 293 #endif 294 295 totalram_pages += free_all_bootmem(); 296 297 reserved_pages = free_pages = 0; 298 299 for_each_memblock(memory, reg) { 300 unsigned int pfn1, pfn2; 301 struct page *page, *end; 302 303 pfn1 = __phys_to_pfn(reg->base); 304 pfn2 = pfn1 + __phys_to_pfn(reg->size); 305 306 page = pfn_to_page(pfn1); 307 end = pfn_to_page(pfn2 - 1) + 1; 308 309 do { 310 if (PageReserved(page)) 311 reserved_pages++; 312 else if (!page_count(page)) 313 free_pages++; 314 page++; 315 } while (page < end); 316 } 317 318 /* 319 * Since our memory may not be contiguous, calculate the real number 320 * of pages we have in this system. 321 */ 322 pr_info("Memory:"); 323 num_physpages = 0; 324 for_each_memblock(memory, reg) { 325 unsigned long pages = memblock_region_memory_end_pfn(reg) - 326 memblock_region_memory_base_pfn(reg); 327 num_physpages += pages; 328 printk(" %ldMB", pages >> (20 - PAGE_SHIFT)); 329 } 330 printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT)); 331 332 pr_notice("Memory: %luk/%luk available, %luk reserved\n", 333 nr_free_pages() << (PAGE_SHIFT-10), 334 free_pages << (PAGE_SHIFT-10), 335 reserved_pages << (PAGE_SHIFT-10)); 336 337 #define MLK(b, t) b, t, ((t) - (b)) >> 10 338 #define MLM(b, t) b, t, ((t) - (b)) >> 20 339 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K) 340 341 pr_notice("Virtual kernel memory layout:\n" 342 " vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n" 343 #ifdef CONFIG_SPARSEMEM_VMEMMAP 344 " vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n" 345 #endif 346 " modules : 0x%16lx - 0x%16lx (%6ld MB)\n" 347 " memory : 0x%16lx - 0x%16lx (%6ld MB)\n" 348 " .init : 0x%p" " - 0x%p" " (%6ld kB)\n" 349 " .text : 0x%p" " - 0x%p" " (%6ld kB)\n" 350 " .data : 0x%p" " - 0x%p" " (%6ld kB)\n", 351 MLM(VMALLOC_START, VMALLOC_END), 352 #ifdef CONFIG_SPARSEMEM_VMEMMAP 353 MLM((unsigned long)virt_to_page(PAGE_OFFSET), 354 (unsigned long)virt_to_page(high_memory)), 355 #endif 356 MLM(MODULES_VADDR, MODULES_END), 357 MLM(PAGE_OFFSET, (unsigned long)high_memory), 358 359 MLK_ROUNDUP(__init_begin, __init_end), 360 MLK_ROUNDUP(_text, _etext), 361 MLK_ROUNDUP(_sdata, _edata)); 362 363 #undef MLK 364 #undef MLM 365 #undef MLK_ROUNDUP 366 367 /* 368 * Check boundaries twice: Some fundamental inconsistencies can be 369 * detected at build time already. 370 */ 371 #ifdef CONFIG_COMPAT 372 BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); 373 #endif 374 BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 375 BUG_ON(TASK_SIZE_64 > MODULES_VADDR); 376 377 if (PAGE_SIZE >= 16384 && num_physpages <= 128) { 378 extern int sysctl_overcommit_memory; 379 /* 380 * On a machine this small we won't get anywhere without 381 * overcommit, so turn it on by default. 382 */ 383 sysctl_overcommit_memory = OVERCOMMIT_ALWAYS; 384 } 385 } 386 387 void free_initmem(void) 388 { 389 poison_init_mem(__init_begin, __init_end - __init_begin); 390 free_initmem_default(0); 391 } 392 393 #ifdef CONFIG_BLK_DEV_INITRD 394 395 static int keep_initrd; 396 397 void free_initrd_mem(unsigned long start, unsigned long end) 398 { 399 if (!keep_initrd) { 400 poison_init_mem((void *)start, PAGE_ALIGN(end) - start); 401 free_reserved_area(start, end, 0, "initrd"); 402 } 403 } 404 405 static int __init keepinitrd_setup(char *__unused) 406 { 407 keep_initrd = 1; 408 return 1; 409 } 410 411 __setup("keepinitrd", keepinitrd_setup); 412 #endif 413