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 base &= PAGE_MASK; 174 size &= PAGE_MASK; 175 if (base + size < PHYS_OFFSET) { 176 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", 177 base, base + size); 178 return; 179 } 180 if (base < PHYS_OFFSET) { 181 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", 182 base, PHYS_OFFSET); 183 size -= PHYS_OFFSET - base; 184 base = PHYS_OFFSET; 185 } 186 memblock_add(base, size); 187 } 188 189 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 190 { 191 return __va(memblock_alloc(size, align)); 192 } 193 194 /* 195 * Limit the memory size that was specified via FDT. 196 */ 197 static int __init early_mem(char *p) 198 { 199 phys_addr_t limit; 200 201 if (!p) 202 return 1; 203 204 limit = memparse(p, &p) & PAGE_MASK; 205 pr_notice("Memory limited to %lldMB\n", limit >> 20); 206 207 memblock_enforce_memory_limit(limit); 208 209 return 0; 210 } 211 early_param("mem", early_mem); 212 213 static void __init request_standard_resources(void) 214 { 215 struct memblock_region *region; 216 struct resource *res; 217 218 kernel_code.start = virt_to_phys(_text); 219 kernel_code.end = virt_to_phys(_etext - 1); 220 kernel_data.start = virt_to_phys(_sdata); 221 kernel_data.end = virt_to_phys(_end - 1); 222 223 for_each_memblock(memory, region) { 224 res = alloc_bootmem_low(sizeof(*res)); 225 res->name = "System RAM"; 226 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 227 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 228 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 229 230 request_resource(&iomem_resource, res); 231 232 if (kernel_code.start >= res->start && 233 kernel_code.end <= res->end) 234 request_resource(res, &kernel_code); 235 if (kernel_data.start >= res->start && 236 kernel_data.end <= res->end) 237 request_resource(res, &kernel_data); 238 } 239 } 240 241 void __init setup_arch(char **cmdline_p) 242 { 243 setup_processor(); 244 245 setup_machine_fdt(__fdt_pointer); 246 247 init_mm.start_code = (unsigned long) _text; 248 init_mm.end_code = (unsigned long) _etext; 249 init_mm.end_data = (unsigned long) _edata; 250 init_mm.brk = (unsigned long) _end; 251 252 *cmdline_p = boot_command_line; 253 254 parse_early_param(); 255 256 arm64_memblock_init(); 257 258 paging_init(); 259 request_standard_resources(); 260 261 unflatten_device_tree(); 262 263 #ifdef CONFIG_SMP 264 smp_init_cpus(); 265 #endif 266 267 #ifdef CONFIG_VT 268 #if defined(CONFIG_VGA_CONSOLE) 269 conswitchp = &vga_con; 270 #elif defined(CONFIG_DUMMY_CONSOLE) 271 conswitchp = &dummy_con; 272 #endif 273 #endif 274 } 275 276 static DEFINE_PER_CPU(struct cpu, cpu_data); 277 278 static int __init topology_init(void) 279 { 280 int i; 281 282 for_each_possible_cpu(i) { 283 struct cpu *cpu = &per_cpu(cpu_data, i); 284 cpu->hotpluggable = 1; 285 register_cpu(cpu, i); 286 } 287 288 return 0; 289 } 290 subsys_initcall(topology_init); 291 292 static const char *hwcap_str[] = { 293 "fp", 294 "asimd", 295 NULL 296 }; 297 298 static int c_show(struct seq_file *m, void *v) 299 { 300 int i; 301 302 seq_printf(m, "Processor\t: %s rev %d (%s)\n", 303 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); 304 305 for_each_online_cpu(i) { 306 /* 307 * glibc reads /proc/cpuinfo to determine the number of 308 * online processors, looking for lines beginning with 309 * "processor". Give glibc what it expects. 310 */ 311 #ifdef CONFIG_SMP 312 seq_printf(m, "processor\t: %d\n", i); 313 #endif 314 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", 315 loops_per_jiffy / (500000UL/HZ), 316 loops_per_jiffy / (5000UL/HZ) % 100); 317 } 318 319 /* dump out the processor features */ 320 seq_puts(m, "Features\t: "); 321 322 for (i = 0; hwcap_str[i]; i++) 323 if (elf_hwcap & (1 << i)) 324 seq_printf(m, "%s ", hwcap_str[i]); 325 326 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); 327 seq_printf(m, "CPU architecture: AArch64\n"); 328 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); 329 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); 330 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); 331 332 seq_puts(m, "\n"); 333 334 seq_printf(m, "Hardware\t: %s\n", machine_name); 335 336 return 0; 337 } 338 339 static void *c_start(struct seq_file *m, loff_t *pos) 340 { 341 return *pos < 1 ? (void *)1 : NULL; 342 } 343 344 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 345 { 346 ++*pos; 347 return NULL; 348 } 349 350 static void c_stop(struct seq_file *m, void *v) 351 { 352 } 353 354 const struct seq_operations cpuinfo_op = { 355 .start = c_start, 356 .next = c_next, 357 .stop = c_stop, 358 .show = c_show 359 }; 360