1 /* 2 * Based on arch/arm/kernel/setup.c 3 * 4 * Copyright (C) 1995-2001 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/export.h> 21 #include <linux/kernel.h> 22 #include <linux/stddef.h> 23 #include <linux/ioport.h> 24 #include <linux/delay.h> 25 #include <linux/utsname.h> 26 #include <linux/initrd.h> 27 #include <linux/console.h> 28 #include <linux/bootmem.h> 29 #include <linux/seq_file.h> 30 #include <linux/screen_info.h> 31 #include <linux/init.h> 32 #include <linux/kexec.h> 33 #include <linux/crash_dump.h> 34 #include <linux/root_dev.h> 35 #include <linux/cpu.h> 36 #include <linux/interrupt.h> 37 #include <linux/smp.h> 38 #include <linux/fs.h> 39 #include <linux/proc_fs.h> 40 #include <linux/memblock.h> 41 #include <linux/of_fdt.h> 42 #include <linux/of_platform.h> 43 44 #include <asm/cputype.h> 45 #include <asm/elf.h> 46 #include <asm/cputable.h> 47 #include <asm/sections.h> 48 #include <asm/setup.h> 49 #include <asm/cacheflush.h> 50 #include <asm/tlbflush.h> 51 #include <asm/traps.h> 52 #include <asm/memblock.h> 53 #include <asm/psci.h> 54 55 unsigned int processor_id; 56 EXPORT_SYMBOL(processor_id); 57 58 unsigned int elf_hwcap __read_mostly; 59 EXPORT_SYMBOL_GPL(elf_hwcap); 60 61 static const char *cpu_name; 62 static const char *machine_name; 63 phys_addr_t __fdt_pointer __initdata; 64 65 /* 66 * Standard memory resources 67 */ 68 static struct resource mem_res[] = { 69 { 70 .name = "Kernel code", 71 .start = 0, 72 .end = 0, 73 .flags = IORESOURCE_MEM 74 }, 75 { 76 .name = "Kernel data", 77 .start = 0, 78 .end = 0, 79 .flags = IORESOURCE_MEM 80 } 81 }; 82 83 #define kernel_code mem_res[0] 84 #define kernel_data mem_res[1] 85 86 void __init early_print(const char *str, ...) 87 { 88 char buf[256]; 89 va_list ap; 90 91 va_start(ap, str); 92 vsnprintf(buf, sizeof(buf), str, ap); 93 va_end(ap); 94 95 printk("%s", buf); 96 } 97 98 static void __init setup_processor(void) 99 { 100 struct cpu_info *cpu_info; 101 102 /* 103 * locate processor in the list of supported processor 104 * types. The linker builds this table for us from the 105 * entries in arch/arm/mm/proc.S 106 */ 107 cpu_info = lookup_processor_type(read_cpuid_id()); 108 if (!cpu_info) { 109 printk("CPU configuration botched (ID %08x), unable to continue.\n", 110 read_cpuid_id()); 111 while (1); 112 } 113 114 cpu_name = cpu_info->cpu_name; 115 116 printk("CPU: %s [%08x] revision %d\n", 117 cpu_name, read_cpuid_id(), read_cpuid_id() & 15); 118 119 sprintf(init_utsname()->machine, "aarch64"); 120 elf_hwcap = 0; 121 } 122 123 static void __init setup_machine_fdt(phys_addr_t dt_phys) 124 { 125 struct boot_param_header *devtree; 126 unsigned long dt_root; 127 128 /* Check we have a non-NULL DT pointer */ 129 if (!dt_phys) { 130 early_print("\n" 131 "Error: NULL or invalid device tree blob\n" 132 "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n" 133 "\nPlease check your bootloader.\n"); 134 135 while (true) 136 cpu_relax(); 137 138 } 139 140 devtree = phys_to_virt(dt_phys); 141 142 /* Check device tree validity */ 143 if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) { 144 early_print("\n" 145 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n" 146 "Expected 0x%x, found 0x%x\n" 147 "\nPlease check your bootloader.\n", 148 dt_phys, devtree, OF_DT_HEADER, 149 be32_to_cpu(devtree->magic)); 150 151 while (true) 152 cpu_relax(); 153 } 154 155 initial_boot_params = devtree; 156 dt_root = of_get_flat_dt_root(); 157 158 machine_name = of_get_flat_dt_prop(dt_root, "model", NULL); 159 if (!machine_name) 160 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL); 161 if (!machine_name) 162 machine_name = "<unknown>"; 163 pr_info("Machine: %s\n", machine_name); 164 165 /* Retrieve various information from the /chosen node */ 166 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); 167 /* Initialize {size,address}-cells info */ 168 of_scan_flat_dt(early_init_dt_scan_root, NULL); 169 /* Setup memory, calling early_init_dt_add_memory_arch */ 170 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 171 } 172 173 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 174 { 175 base &= PAGE_MASK; 176 size &= PAGE_MASK; 177 if (base + size < PHYS_OFFSET) { 178 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", 179 base, base + size); 180 return; 181 } 182 if (base < PHYS_OFFSET) { 183 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", 184 base, PHYS_OFFSET); 185 size -= PHYS_OFFSET - base; 186 base = PHYS_OFFSET; 187 } 188 memblock_add(base, size); 189 } 190 191 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 192 { 193 return __va(memblock_alloc(size, align)); 194 } 195 196 /* 197 * Limit the memory size that was specified via FDT. 198 */ 199 static int __init early_mem(char *p) 200 { 201 phys_addr_t limit; 202 203 if (!p) 204 return 1; 205 206 limit = memparse(p, &p) & PAGE_MASK; 207 pr_notice("Memory limited to %lldMB\n", limit >> 20); 208 209 memblock_enforce_memory_limit(limit); 210 211 return 0; 212 } 213 early_param("mem", early_mem); 214 215 static void __init request_standard_resources(void) 216 { 217 struct memblock_region *region; 218 struct resource *res; 219 220 kernel_code.start = virt_to_phys(_text); 221 kernel_code.end = virt_to_phys(_etext - 1); 222 kernel_data.start = virt_to_phys(_sdata); 223 kernel_data.end = virt_to_phys(_end - 1); 224 225 for_each_memblock(memory, region) { 226 res = alloc_bootmem_low(sizeof(*res)); 227 res->name = "System RAM"; 228 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 229 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 230 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 231 232 request_resource(&iomem_resource, res); 233 234 if (kernel_code.start >= res->start && 235 kernel_code.end <= res->end) 236 request_resource(res, &kernel_code); 237 if (kernel_data.start >= res->start && 238 kernel_data.end <= res->end) 239 request_resource(res, &kernel_data); 240 } 241 } 242 243 void __init setup_arch(char **cmdline_p) 244 { 245 setup_processor(); 246 247 setup_machine_fdt(__fdt_pointer); 248 249 init_mm.start_code = (unsigned long) _text; 250 init_mm.end_code = (unsigned long) _etext; 251 init_mm.end_data = (unsigned long) _edata; 252 init_mm.brk = (unsigned long) _end; 253 254 *cmdline_p = boot_command_line; 255 256 parse_early_param(); 257 258 arm64_memblock_init(); 259 260 paging_init(); 261 request_standard_resources(); 262 263 unflatten_device_tree(); 264 265 psci_init(); 266 267 #ifdef CONFIG_SMP 268 smp_init_cpus(); 269 #endif 270 271 #ifdef CONFIG_VT 272 #if defined(CONFIG_VGA_CONSOLE) 273 conswitchp = &vga_con; 274 #elif defined(CONFIG_DUMMY_CONSOLE) 275 conswitchp = &dummy_con; 276 #endif 277 #endif 278 } 279 280 static DEFINE_PER_CPU(struct cpu, cpu_data); 281 282 static int __init topology_init(void) 283 { 284 int i; 285 286 for_each_possible_cpu(i) { 287 struct cpu *cpu = &per_cpu(cpu_data, i); 288 cpu->hotpluggable = 1; 289 register_cpu(cpu, i); 290 } 291 292 return 0; 293 } 294 subsys_initcall(topology_init); 295 296 static int __init arm64_device_probe(void) 297 { 298 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 299 return 0; 300 } 301 device_initcall(arm64_device_probe); 302 303 static const char *hwcap_str[] = { 304 "fp", 305 "asimd", 306 NULL 307 }; 308 309 static int c_show(struct seq_file *m, void *v) 310 { 311 int i; 312 313 seq_printf(m, "Processor\t: %s rev %d (%s)\n", 314 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); 315 316 for_each_online_cpu(i) { 317 /* 318 * glibc reads /proc/cpuinfo to determine the number of 319 * online processors, looking for lines beginning with 320 * "processor". Give glibc what it expects. 321 */ 322 #ifdef CONFIG_SMP 323 seq_printf(m, "processor\t: %d\n", i); 324 #endif 325 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", 326 loops_per_jiffy / (500000UL/HZ), 327 loops_per_jiffy / (5000UL/HZ) % 100); 328 } 329 330 /* dump out the processor features */ 331 seq_puts(m, "Features\t: "); 332 333 for (i = 0; hwcap_str[i]; i++) 334 if (elf_hwcap & (1 << i)) 335 seq_printf(m, "%s ", hwcap_str[i]); 336 337 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); 338 seq_printf(m, "CPU architecture: AArch64\n"); 339 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); 340 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); 341 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); 342 343 seq_puts(m, "\n"); 344 345 seq_printf(m, "Hardware\t: %s\n", machine_name); 346 347 return 0; 348 } 349 350 static void *c_start(struct seq_file *m, loff_t *pos) 351 { 352 return *pos < 1 ? (void *)1 : NULL; 353 } 354 355 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 356 { 357 ++*pos; 358 return NULL; 359 } 360 361 static void c_stop(struct seq_file *m, void *v) 362 { 363 } 364 365 const struct seq_operations cpuinfo_op = { 366 .start = c_start, 367 .next = c_next, 368 .stop = c_stop, 369 .show = c_show 370 }; 371