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/clk-provider.h> 36 #include <linux/cpu.h> 37 #include <linux/interrupt.h> 38 #include <linux/smp.h> 39 #include <linux/fs.h> 40 #include <linux/proc_fs.h> 41 #include <linux/memblock.h> 42 #include <linux/of_fdt.h> 43 #include <linux/of_platform.h> 44 45 #include <asm/cputype.h> 46 #include <asm/elf.h> 47 #include <asm/cputable.h> 48 #include <asm/sections.h> 49 #include <asm/setup.h> 50 #include <asm/smp_plat.h> 51 #include <asm/cacheflush.h> 52 #include <asm/tlbflush.h> 53 #include <asm/traps.h> 54 #include <asm/memblock.h> 55 #include <asm/psci.h> 56 57 unsigned int processor_id; 58 EXPORT_SYMBOL(processor_id); 59 60 unsigned int elf_hwcap __read_mostly; 61 EXPORT_SYMBOL_GPL(elf_hwcap); 62 63 static const char *cpu_name; 64 static const char *machine_name; 65 phys_addr_t __fdt_pointer __initdata; 66 67 /* 68 * Standard memory resources 69 */ 70 static struct resource mem_res[] = { 71 { 72 .name = "Kernel code", 73 .start = 0, 74 .end = 0, 75 .flags = IORESOURCE_MEM 76 }, 77 { 78 .name = "Kernel data", 79 .start = 0, 80 .end = 0, 81 .flags = IORESOURCE_MEM 82 } 83 }; 84 85 #define kernel_code mem_res[0] 86 #define kernel_data mem_res[1] 87 88 void __init early_print(const char *str, ...) 89 { 90 char buf[256]; 91 va_list ap; 92 93 va_start(ap, str); 94 vsnprintf(buf, sizeof(buf), str, ap); 95 va_end(ap); 96 97 printk("%s", buf); 98 } 99 100 static void __init setup_processor(void) 101 { 102 struct cpu_info *cpu_info; 103 104 /* 105 * locate processor in the list of supported processor 106 * types. The linker builds this table for us from the 107 * entries in arch/arm/mm/proc.S 108 */ 109 cpu_info = lookup_processor_type(read_cpuid_id()); 110 if (!cpu_info) { 111 printk("CPU configuration botched (ID %08x), unable to continue.\n", 112 read_cpuid_id()); 113 while (1); 114 } 115 116 cpu_name = cpu_info->cpu_name; 117 118 printk("CPU: %s [%08x] revision %d\n", 119 cpu_name, read_cpuid_id(), read_cpuid_id() & 15); 120 121 sprintf(init_utsname()->machine, "aarch64"); 122 elf_hwcap = 0; 123 } 124 125 static void __init setup_machine_fdt(phys_addr_t dt_phys) 126 { 127 struct boot_param_header *devtree; 128 unsigned long dt_root; 129 130 /* Check we have a non-NULL DT pointer */ 131 if (!dt_phys) { 132 early_print("\n" 133 "Error: NULL or invalid device tree blob\n" 134 "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n" 135 "\nPlease check your bootloader.\n"); 136 137 while (true) 138 cpu_relax(); 139 140 } 141 142 devtree = phys_to_virt(dt_phys); 143 144 /* Check device tree validity */ 145 if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) { 146 early_print("\n" 147 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n" 148 "Expected 0x%x, found 0x%x\n" 149 "\nPlease check your bootloader.\n", 150 dt_phys, devtree, OF_DT_HEADER, 151 be32_to_cpu(devtree->magic)); 152 153 while (true) 154 cpu_relax(); 155 } 156 157 initial_boot_params = devtree; 158 dt_root = of_get_flat_dt_root(); 159 160 machine_name = of_get_flat_dt_prop(dt_root, "model", NULL); 161 if (!machine_name) 162 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL); 163 if (!machine_name) 164 machine_name = "<unknown>"; 165 pr_info("Machine: %s\n", machine_name); 166 167 /* Retrieve various information from the /chosen node */ 168 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); 169 /* Initialize {size,address}-cells info */ 170 of_scan_flat_dt(early_init_dt_scan_root, NULL); 171 /* Setup memory, calling early_init_dt_add_memory_arch */ 172 of_scan_flat_dt(early_init_dt_scan_memory, NULL); 173 } 174 175 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 176 { 177 base &= PAGE_MASK; 178 size &= PAGE_MASK; 179 if (base + size < PHYS_OFFSET) { 180 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", 181 base, base + size); 182 return; 183 } 184 if (base < PHYS_OFFSET) { 185 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", 186 base, PHYS_OFFSET); 187 size -= PHYS_OFFSET - base; 188 base = PHYS_OFFSET; 189 } 190 memblock_add(base, size); 191 } 192 193 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 194 { 195 return __va(memblock_alloc(size, align)); 196 } 197 198 /* 199 * Limit the memory size that was specified via FDT. 200 */ 201 static int __init early_mem(char *p) 202 { 203 phys_addr_t limit; 204 205 if (!p) 206 return 1; 207 208 limit = memparse(p, &p) & PAGE_MASK; 209 pr_notice("Memory limited to %lldMB\n", limit >> 20); 210 211 memblock_enforce_memory_limit(limit); 212 213 return 0; 214 } 215 early_param("mem", early_mem); 216 217 static void __init request_standard_resources(void) 218 { 219 struct memblock_region *region; 220 struct resource *res; 221 222 kernel_code.start = virt_to_phys(_text); 223 kernel_code.end = virt_to_phys(_etext - 1); 224 kernel_data.start = virt_to_phys(_sdata); 225 kernel_data.end = virt_to_phys(_end - 1); 226 227 for_each_memblock(memory, region) { 228 res = alloc_bootmem_low(sizeof(*res)); 229 res->name = "System RAM"; 230 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 231 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 232 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 233 234 request_resource(&iomem_resource, res); 235 236 if (kernel_code.start >= res->start && 237 kernel_code.end <= res->end) 238 request_resource(res, &kernel_code); 239 if (kernel_data.start >= res->start && 240 kernel_data.end <= res->end) 241 request_resource(res, &kernel_data); 242 } 243 } 244 245 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; 246 247 void __init setup_arch(char **cmdline_p) 248 { 249 setup_processor(); 250 251 setup_machine_fdt(__fdt_pointer); 252 253 init_mm.start_code = (unsigned long) _text; 254 init_mm.end_code = (unsigned long) _etext; 255 init_mm.end_data = (unsigned long) _edata; 256 init_mm.brk = (unsigned long) _end; 257 258 *cmdline_p = boot_command_line; 259 260 parse_early_param(); 261 262 arm64_memblock_init(); 263 264 paging_init(); 265 request_standard_resources(); 266 267 unflatten_device_tree(); 268 269 psci_init(); 270 271 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK; 272 #ifdef CONFIG_SMP 273 smp_init_cpus(); 274 #endif 275 276 #ifdef CONFIG_VT 277 #if defined(CONFIG_VGA_CONSOLE) 278 conswitchp = &vga_con; 279 #elif defined(CONFIG_DUMMY_CONSOLE) 280 conswitchp = &dummy_con; 281 #endif 282 #endif 283 } 284 285 static int __init arm64_of_clk_init(void) 286 { 287 of_clk_init(NULL); 288 return 0; 289 } 290 arch_initcall(arm64_of_clk_init); 291 292 static DEFINE_PER_CPU(struct cpu, cpu_data); 293 294 static int __init topology_init(void) 295 { 296 int i; 297 298 for_each_possible_cpu(i) { 299 struct cpu *cpu = &per_cpu(cpu_data, i); 300 cpu->hotpluggable = 1; 301 register_cpu(cpu, i); 302 } 303 304 return 0; 305 } 306 subsys_initcall(topology_init); 307 308 static int __init arm64_device_probe(void) 309 { 310 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 311 return 0; 312 } 313 device_initcall(arm64_device_probe); 314 315 static const char *hwcap_str[] = { 316 "fp", 317 "asimd", 318 NULL 319 }; 320 321 static int c_show(struct seq_file *m, void *v) 322 { 323 int i; 324 325 seq_printf(m, "Processor\t: %s rev %d (%s)\n", 326 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); 327 328 for_each_online_cpu(i) { 329 /* 330 * glibc reads /proc/cpuinfo to determine the number of 331 * online processors, looking for lines beginning with 332 * "processor". Give glibc what it expects. 333 */ 334 #ifdef CONFIG_SMP 335 seq_printf(m, "processor\t: %d\n", i); 336 #endif 337 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", 338 loops_per_jiffy / (500000UL/HZ), 339 loops_per_jiffy / (5000UL/HZ) % 100); 340 } 341 342 /* dump out the processor features */ 343 seq_puts(m, "Features\t: "); 344 345 for (i = 0; hwcap_str[i]; i++) 346 if (elf_hwcap & (1 << i)) 347 seq_printf(m, "%s ", hwcap_str[i]); 348 349 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); 350 seq_printf(m, "CPU architecture: AArch64\n"); 351 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); 352 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); 353 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); 354 355 seq_puts(m, "\n"); 356 357 seq_printf(m, "Hardware\t: %s\n", machine_name); 358 359 return 0; 360 } 361 362 static void *c_start(struct seq_file *m, loff_t *pos) 363 { 364 return *pos < 1 ? (void *)1 : NULL; 365 } 366 367 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 368 { 369 ++*pos; 370 return NULL; 371 } 372 373 static void c_stop(struct seq_file *m, void *v) 374 { 375 } 376 377 const struct seq_operations cpuinfo_op = { 378 .start = c_start, 379 .next = c_next, 380 .stop = c_stop, 381 .show = c_show 382 }; 383