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 #ifdef CONFIG_COMPAT
  65 #define COMPAT_ELF_HWCAP_DEFAULT        \
  66                                 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
  67                                  COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
  68                                  COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
  69                                  COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
  70                                  COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
  71 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
  72 #endif
  73
  74 static const char *cpu_name;
  75 static const char *machine_name;
  76 phys_addr_t __fdt_pointer __initdata;
  77
  78 /*
  79  * Standard memory resources
  80  */
  81 static struct resource mem_res[] = {
  82         {
  83                 .name = "Kernel code",
  84                 .start = 0,
  85                 .end = 0,
  86                 .flags = IORESOURCE_MEM
  87         },
  88         {
  89                 .name = "Kernel data",
  90                 .start = 0,
  91                 .end = 0,
  92                 .flags = IORESOURCE_MEM
  93         }
  94 };
  95
  96 #define kernel_code mem_res[0]
  97 #define kernel_data mem_res[1]
  98
  99 void __init early_print(const char *str, ...)
 100 {
 101         char buf[256];
 102         va_list ap;
 103
 104         va_start(ap, str);
 105         vsnprintf(buf, sizeof(buf), str, ap);
 106         va_end(ap);
 107
 108         printk("%s", buf);
 109 }
 110
 111 void __init smp_setup_processor_id(void)
 112 {
 113         /*
 114          * clear __my_cpu_offset on boot CPU to avoid hang caused by
 115          * using percpu variable early, for example, lockdep will
 116          * access percpu variable inside lock_release
 117          */
 118         set_my_cpu_offset(0);
 119 }
 120
 121 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 122 {
 123         return phys_id == cpu_logical_map(cpu);
 124 }
 125
 126 static void __init setup_processor(void)
 127 {
 128         struct cpu_info *cpu_info;
 129         u64 features, block;
 130
 131         cpu_info = lookup_processor_type(read_cpuid_id());
 132         if (!cpu_info) {
 133                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 134                        read_cpuid_id());
 135                 while (1);
 136         }
 137
 138         cpu_name = cpu_info->cpu_name;
 139
 140         printk("CPU: %s [%08x] revision %d\n",
 141                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 142
 143         sprintf(init_utsname()->machine, ELF_PLATFORM);
 144         elf_hwcap = 0;
 145
 146         /*
 147          * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks.
 148          * The blocks we test below represent incremental functionality
 149          * for non-negative values. Negative values are reserved.
 150          */
 151         features = read_cpuid(ID_AA64ISAR0_EL1);
 152         block = (features >> 4) & 0xf;
 153         if (!(block & 0x8)) {
 154                 switch (block) {
 155                 default:
 156                 case 2:
 157                         elf_hwcap |= HWCAP_PMULL;
 158                 case 1:
 159                         elf_hwcap |= HWCAP_AES;
 160                 case 0:
 161                         break;
 162                 }
 163         }
 164
 165         block = (features >> 8) & 0xf;
 166         if (block && !(block & 0x8))
 167                 elf_hwcap |= HWCAP_SHA1;
 168
 169         block = (features >> 12) & 0xf;
 170         if (block && !(block & 0x8))
 171                 elf_hwcap |= HWCAP_SHA2;
 172
 173         block = (features >> 16) & 0xf;
 174         if (block && !(block & 0x8))
 175                 elf_hwcap |= HWCAP_CRC32;
 176 }
 177
 178 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 179 {
 180         if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
 181                 early_print("\n"
 182                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 183                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 184                         "\nPlease check your bootloader.\n",
 185                         dt_phys, phys_to_virt(dt_phys));
 186
 187                 while (true)
 188                         cpu_relax();
 189         }
 190
 191         machine_name = of_flat_dt_get_machine_name();
 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         /*
 246          * Unmask asynchronous aborts early to catch possible system errors.
 247          */
 248         local_async_enable();
 249
 250         setup_processor();
 251
 252         setup_machine_fdt(__fdt_pointer);
 253
 254         init_mm.start_code = (unsigned long) _text;
 255         init_mm.end_code   = (unsigned long) _etext;
 256         init_mm.end_data   = (unsigned long) _edata;
 257         init_mm.brk        = (unsigned long) _end;
 258
 259         *cmdline_p = boot_command_line;
 260
 261         parse_early_param();
 262
 263         arm64_memblock_init();
 264
 265         paging_init();
 266         request_standard_resources();
 267
 268         unflatten_device_tree();
 269
 270         psci_init();
 271
 272         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 273         cpu_read_bootcpu_ops();
 274 #ifdef CONFIG_SMP
 275         smp_init_cpus();
 276 #endif
 277
 278 #ifdef CONFIG_VT
 279 #if defined(CONFIG_VGA_CONSOLE)
 280         conswitchp = &vga_con;
 281 #elif defined(CONFIG_DUMMY_CONSOLE)
 282         conswitchp = &dummy_con;
 283 #endif
 284 #endif
 285 }
 286
 287 static int __init arm64_device_init(void)
 288 {
 289         of_clk_init(NULL);
 290         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 291         return 0;
 292 }
 293 arch_initcall(arm64_device_init);
 294
 295 static DEFINE_PER_CPU(struct cpu, cpu_data);
 296
 297 static int __init topology_init(void)
 298 {
 299         int i;
 300
 301         for_each_possible_cpu(i) {
 302                 struct cpu *cpu = &per_cpu(cpu_data, i);
 303                 cpu->hotpluggable = 1;
 304                 register_cpu(cpu, i);
 305         }
 306
 307         return 0;
 308 }
 309 subsys_initcall(topology_init);
 310
 311 static const char *hwcap_str[] = {
 312         "fp",
 313         "asimd",
 314         "evtstrm",
 315         "aes",
 316         "pmull",
 317         "sha1",
 318         "sha2",
 319         "crc32",
 320         NULL
 321 };
 322
 323 static int c_show(struct seq_file *m, void *v)
 324 {
 325         int i;
 326
 327         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 328                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 329
 330         for_each_online_cpu(i) {
 331                 /*
 332                  * glibc reads /proc/cpuinfo to determine the number of
 333                  * online processors, looking for lines beginning with
 334                  * "processor".  Give glibc what it expects.
 335                  */
 336 #ifdef CONFIG_SMP
 337                 seq_printf(m, "processor\t: %d\n", i);
 338 #endif
 339         }
 340
 341         /* dump out the processor features */
 342         seq_puts(m, "Features\t: ");
 343
 344         for (i = 0; hwcap_str[i]; i++)
 345                 if (elf_hwcap & (1 << i))
 346                         seq_printf(m, "%s ", hwcap_str[i]);
 347
 348         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 349         seq_printf(m, "CPU architecture: AArch64\n");
 350         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 351         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 352         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 353
 354         seq_puts(m, "\n");
 355
 356         seq_printf(m, "Hardware\t: %s\n", machine_name);
 357
 358         return 0;
 359 }
 360
 361 static void *c_start(struct seq_file *m, loff_t *pos)
 362 {
 363         return *pos < 1 ? (void *)1 : NULL;
 364 }
 365
 366 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 367 {
 368         ++*pos;
 369         return NULL;
 370 }
 371
 372 static void c_stop(struct seq_file *m, void *v)
 373 {
 374 }
 375
 376 const struct seq_operations cpuinfo_op = {
 377         .start  = c_start,
 378         .next   = c_next,
 379         .stop   = c_stop,
 380         .show   = c_show
 381 };