arch/arm64/kernel/setup.c

   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/cpu_ops.h>
  49 #include <asm/sections.h>
  50 #include <asm/setup.h>
  51 #include <asm/smp_plat.h>
  52 #include <asm/cacheflush.h>
  53 #include <asm/tlbflush.h>
  54 #include <asm/traps.h>
  55 #include <asm/memblock.h>
  56 #include <asm/psci.h>
  57
  58 unsigned int processor_id;
  59 EXPORT_SYMBOL(processor_id);
  60
  61 unsigned long elf_hwcap __read_mostly;
  62 EXPORT_SYMBOL_GPL(elf_hwcap);
  63
  64 static const char *cpu_name;
  65 static const char *machine_name;
  66 phys_addr_t __fdt_pointer __initdata;
  67
  68 /*
  69  * Standard memory resources
  70  */
  71 static struct resource mem_res[] = {
  72         {
  73                 .name = "Kernel code",
  74                 .start = 0,
  75                 .end = 0,
  76                 .flags = IORESOURCE_MEM
  77         },
  78         {
  79                 .name = "Kernel data",
  80                 .start = 0,
  81                 .end = 0,
  82                 .flags = IORESOURCE_MEM
  83         }
  84 };
  85
  86 #define kernel_code mem_res[0]
  87 #define kernel_data mem_res[1]
  88
  89 void __init early_print(const char *str, ...)
  90 {
  91         char buf[256];
  92         va_list ap;
  93
  94         va_start(ap, str);
  95         vsnprintf(buf, sizeof(buf), str, ap);
  96         va_end(ap);
  97
  98         printk("%s", buf);
  99 }
 100
 101 static void __init setup_processor(void)
 102 {
 103         struct cpu_info *cpu_info;
 104
 105         /*
 106          * locate processor in the list of supported processor
 107          * types.  The linker builds this table for us from the
 108          * entries in arch/arm/mm/proc.S
 109          */
 110         cpu_info = lookup_processor_type(read_cpuid_id());
 111         if (!cpu_info) {
 112                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 113                        read_cpuid_id());
 114                 while (1);
 115         }
 116
 117         cpu_name = cpu_info->cpu_name;
 118
 119         printk("CPU: %s [%08x] revision %d\n",
 120                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 121
 122         sprintf(init_utsname()->machine, "aarch64");
 123         elf_hwcap = 0;
 124 }
 125
 126 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 127 {
 128         struct boot_param_header *devtree;
 129         unsigned long dt_root;
 130
 131         /* Check we have a non-NULL DT pointer */
 132         if (!dt_phys) {
 133                 early_print("\n"
 134                         "Error: NULL or invalid device tree blob\n"
 135                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 136                         "\nPlease check your bootloader.\n");
 137
 138                 while (true)
 139                         cpu_relax();
 140
 141         }
 142
 143         devtree = phys_to_virt(dt_phys);
 144
 145         /* Check device tree validity */
 146         if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
 147                 early_print("\n"
 148                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 149                         "Expected 0x%x, found 0x%x\n"
 150                         "\nPlease check your bootloader.\n",
 151                         dt_phys, devtree, OF_DT_HEADER,
 152                         be32_to_cpu(devtree->magic));
 153
 154                 while (true)
 155                         cpu_relax();
 156         }
 157
 158         initial_boot_params = devtree;
 159         dt_root = of_get_flat_dt_root();
 160
 161         machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
 162         if (!machine_name)
 163                 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
 164         if (!machine_name)
 165                 machine_name = "<unknown>";
 166         pr_info("Machine: %s\n", machine_name);
 167
 168         /* Retrieve various information from the /chosen node */
 169         of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
 170         /* Initialize {size,address}-cells info */
 171         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 172         /* Setup memory, calling early_init_dt_add_memory_arch */
 173         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 174 }
 175
 176 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 177 {
 178         base &= PAGE_MASK;
 179         size &= PAGE_MASK;
 180         if (base + size < PHYS_OFFSET) {
 181                 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
 182                            base, base + size);
 183                 return;
 184         }
 185         if (base < PHYS_OFFSET) {
 186                 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
 187                            base, PHYS_OFFSET);
 188                 size -= PHYS_OFFSET - base;
 189                 base = PHYS_OFFSET;
 190         }
 191         memblock_add(base, size);
 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 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 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         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 268         cpu_read_bootcpu_ops();
 269 #ifdef CONFIG_SMP
 270         smp_init_cpus();
 271 #endif
 272
 273 #ifdef CONFIG_VT
 274 #if defined(CONFIG_VGA_CONSOLE)
 275         conswitchp = &vga_con;
 276 #elif defined(CONFIG_DUMMY_CONSOLE)
 277         conswitchp = &dummy_con;
 278 #endif
 279 #endif
 280 }
 281
 282 static int __init arm64_device_init(void)
 283 {
 284         of_clk_init(NULL);
 285         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 286         return 0;
 287 }
 288 arch_initcall(arm64_device_init);
 289
 290 static DEFINE_PER_CPU(struct cpu, cpu_data);
 291
 292 static int __init topology_init(void)
 293 {
 294         int i;
 295
 296         for_each_possible_cpu(i) {
 297                 struct cpu *cpu = &per_cpu(cpu_data, i);
 298                 cpu->hotpluggable = 1;
 299                 register_cpu(cpu, i);
 300         }
 301
 302         return 0;
 303 }
 304 subsys_initcall(topology_init);
 305
 306 static const char *hwcap_str[] = {
 307         "fp",
 308         "asimd",
 309         NULL
 310 };
 311
 312 static int c_show(struct seq_file *m, void *v)
 313 {
 314         int i;
 315
 316         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 317                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 318
 319         for_each_online_cpu(i) {
 320                 /*
 321                  * glibc reads /proc/cpuinfo to determine the number of
 322                  * online processors, looking for lines beginning with
 323                  * "processor".  Give glibc what it expects.
 324                  */
 325 #ifdef CONFIG_SMP
 326                 seq_printf(m, "processor\t: %d\n", i);
 327 #endif
 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 };