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