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 long 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 if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) { 128 early_print("\n" 129 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\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 dt_phys, phys_to_virt(dt_phys)); 133 134 while (true) 135 cpu_relax(); 136 } 137 138 machine_name = of_flat_dt_get_machine_name(); 139 } 140 141 /* 142 * Limit the memory size that was specified via FDT. 143 */ 144 static int __init early_mem(char *p) 145 { 146 phys_addr_t limit; 147 148 if (!p) 149 return 1; 150 151 limit = memparse(p, &p) & PAGE_MASK; 152 pr_notice("Memory limited to %lldMB\n", limit >> 20); 153 154 memblock_enforce_memory_limit(limit); 155 156 return 0; 157 } 158 early_param("mem", early_mem); 159 160 static void __init request_standard_resources(void) 161 { 162 struct memblock_region *region; 163 struct resource *res; 164 165 kernel_code.start = virt_to_phys(_text); 166 kernel_code.end = virt_to_phys(_etext - 1); 167 kernel_data.start = virt_to_phys(_sdata); 168 kernel_data.end = virt_to_phys(_end - 1); 169 170 for_each_memblock(memory, region) { 171 res = alloc_bootmem_low(sizeof(*res)); 172 res->name = "System RAM"; 173 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 174 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 175 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 176 177 request_resource(&iomem_resource, res); 178 179 if (kernel_code.start >= res->start && 180 kernel_code.end <= res->end) 181 request_resource(res, &kernel_code); 182 if (kernel_data.start >= res->start && 183 kernel_data.end <= res->end) 184 request_resource(res, &kernel_data); 185 } 186 } 187 188 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; 189 190 void __init setup_arch(char **cmdline_p) 191 { 192 setup_processor(); 193 194 setup_machine_fdt(__fdt_pointer); 195 196 init_mm.start_code = (unsigned long) _text; 197 init_mm.end_code = (unsigned long) _etext; 198 init_mm.end_data = (unsigned long) _edata; 199 init_mm.brk = (unsigned long) _end; 200 201 *cmdline_p = boot_command_line; 202 203 parse_early_param(); 204 205 arm64_memblock_init(); 206 207 paging_init(); 208 request_standard_resources(); 209 210 unflatten_device_tree(); 211 212 psci_init(); 213 214 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK; 215 #ifdef CONFIG_SMP 216 smp_init_cpus(); 217 #endif 218 219 #ifdef CONFIG_VT 220 #if defined(CONFIG_VGA_CONSOLE) 221 conswitchp = &vga_con; 222 #elif defined(CONFIG_DUMMY_CONSOLE) 223 conswitchp = &dummy_con; 224 #endif 225 #endif 226 } 227 228 static int __init arm64_device_init(void) 229 { 230 of_clk_init(NULL); 231 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 232 return 0; 233 } 234 arch_initcall(arm64_device_init); 235 236 static DEFINE_PER_CPU(struct cpu, cpu_data); 237 238 static int __init topology_init(void) 239 { 240 int i; 241 242 for_each_possible_cpu(i) { 243 struct cpu *cpu = &per_cpu(cpu_data, i); 244 cpu->hotpluggable = 1; 245 register_cpu(cpu, i); 246 } 247 248 return 0; 249 } 250 subsys_initcall(topology_init); 251 252 static const char *hwcap_str[] = { 253 "fp", 254 "asimd", 255 NULL 256 }; 257 258 static int c_show(struct seq_file *m, void *v) 259 { 260 int i; 261 262 seq_printf(m, "Processor\t: %s rev %d (%s)\n", 263 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM); 264 265 for_each_online_cpu(i) { 266 /* 267 * glibc reads /proc/cpuinfo to determine the number of 268 * online processors, looking for lines beginning with 269 * "processor". Give glibc what it expects. 270 */ 271 #ifdef CONFIG_SMP 272 seq_printf(m, "processor\t: %d\n", i); 273 #endif 274 } 275 276 /* dump out the processor features */ 277 seq_puts(m, "Features\t: "); 278 279 for (i = 0; hwcap_str[i]; i++) 280 if (elf_hwcap & (1 << i)) 281 seq_printf(m, "%s ", hwcap_str[i]); 282 283 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); 284 seq_printf(m, "CPU architecture: AArch64\n"); 285 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15); 286 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff); 287 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); 288 289 seq_puts(m, "\n"); 290 291 seq_printf(m, "Hardware\t: %s\n", machine_name); 292 293 return 0; 294 } 295 296 static void *c_start(struct seq_file *m, loff_t *pos) 297 { 298 return *pos < 1 ? (void *)1 : NULL; 299 } 300 301 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 302 { 303 ++*pos; 304 return NULL; 305 } 306 307 static void c_stop(struct seq_file *m, void *v) 308 { 309 } 310 311 const struct seq_operations cpuinfo_op = { 312 .start = c_start, 313 .next = c_next, 314 .stop = c_stop, 315 .show = c_show 316 }; 317