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 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 112 {
 113         return phys_id == cpu_logical_map(cpu);
 114 }
 115
 116 static void __init setup_processor(void)
 117 {
 118         struct cpu_info *cpu_info;
 119
 120         /*
 121          * locate processor in the list of supported processor
 122          * types.  The linker builds this table for us from the
 123          * entries in arch/arm/mm/proc.S
 124          */
 125         cpu_info = lookup_processor_type(read_cpuid_id());
 126         if (!cpu_info) {
 127                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 128                        read_cpuid_id());
 129                 while (1);
 130         }
 131
 132         cpu_name = cpu_info->cpu_name;
 133
 134         printk("CPU: %s [%08x] revision %d\n",
 135                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 136
 137         sprintf(init_utsname()->machine, ELF_PLATFORM);
 138         elf_hwcap = 0;
 139 }
 140
 141 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 142 {
 143         if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
 144                 early_print("\n"
 145                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 146                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 147                         "\nPlease check your bootloader.\n",
 148                         dt_phys, phys_to_virt(dt_phys));
 149
 150                 while (true)
 151                         cpu_relax();
 152         }
 153
 154         machine_name = of_flat_dt_get_machine_name();
 155 }
 156
 157 /*
 158  * Limit the memory size that was specified via FDT.
 159  */
 160 static int __init early_mem(char *p)
 161 {
 162         phys_addr_t limit;
 163
 164         if (!p)
 165                 return 1;
 166
 167         limit = memparse(p, &p) & PAGE_MASK;
 168         pr_notice("Memory limited to %lldMB\n", limit >> 20);
 169
 170         memblock_enforce_memory_limit(limit);
 171
 172         return 0;
 173 }
 174 early_param("mem", early_mem);
 175
 176 static void __init request_standard_resources(void)
 177 {
 178         struct memblock_region *region;
 179         struct resource *res;
 180
 181         kernel_code.start   = virt_to_phys(_text);
 182         kernel_code.end     = virt_to_phys(_etext - 1);
 183         kernel_data.start   = virt_to_phys(_sdata);
 184         kernel_data.end     = virt_to_phys(_end - 1);
 185
 186         for_each_memblock(memory, region) {
 187                 res = alloc_bootmem_low(sizeof(*res));
 188                 res->name  = "System RAM";
 189                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 190                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 191                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 192
 193                 request_resource(&iomem_resource, res);
 194
 195                 if (kernel_code.start >= res->start &&
 196                     kernel_code.end <= res->end)
 197                         request_resource(res, &kernel_code);
 198                 if (kernel_data.start >= res->start &&
 199                     kernel_data.end <= res->end)
 200                         request_resource(res, &kernel_data);
 201         }
 202 }
 203
 204 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 205
 206 void __init setup_arch(char **cmdline_p)
 207 {
 208         /*
 209          * Unmask asynchronous aborts early to catch possible system errors.
 210          */
 211         local_async_enable();
 212
 213         setup_processor();
 214
 215         setup_machine_fdt(__fdt_pointer);
 216
 217         init_mm.start_code = (unsigned long) _text;
 218         init_mm.end_code   = (unsigned long) _etext;
 219         init_mm.end_data   = (unsigned long) _edata;
 220         init_mm.brk        = (unsigned long) _end;
 221
 222         *cmdline_p = boot_command_line;
 223
 224         parse_early_param();
 225
 226         arm64_memblock_init();
 227
 228         paging_init();
 229         request_standard_resources();
 230
 231         unflatten_device_tree();
 232
 233         psci_init();
 234
 235         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 236         cpu_read_bootcpu_ops();
 237 #ifdef CONFIG_SMP
 238         smp_init_cpus();
 239 #endif
 240
 241 #ifdef CONFIG_VT
 242 #if defined(CONFIG_VGA_CONSOLE)
 243         conswitchp = &vga_con;
 244 #elif defined(CONFIG_DUMMY_CONSOLE)
 245         conswitchp = &dummy_con;
 246 #endif
 247 #endif
 248 }
 249
 250 static int __init arm64_device_init(void)
 251 {
 252         of_clk_init(NULL);
 253         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 254         return 0;
 255 }
 256 arch_initcall(arm64_device_init);
 257
 258 static DEFINE_PER_CPU(struct cpu, cpu_data);
 259
 260 static int __init topology_init(void)
 261 {
 262         int i;
 263
 264         for_each_possible_cpu(i) {
 265                 struct cpu *cpu = &per_cpu(cpu_data, i);
 266                 cpu->hotpluggable = 1;
 267                 register_cpu(cpu, i);
 268         }
 269
 270         return 0;
 271 }
 272 subsys_initcall(topology_init);
 273
 274 static const char *hwcap_str[] = {
 275         "fp",
 276         "asimd",
 277         "evtstrm",
 278         NULL
 279 };
 280
 281 static int c_show(struct seq_file *m, void *v)
 282 {
 283         int i;
 284
 285         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 286                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 287
 288         for_each_online_cpu(i) {
 289                 /*
 290                  * glibc reads /proc/cpuinfo to determine the number of
 291                  * online processors, looking for lines beginning with
 292                  * "processor".  Give glibc what it expects.
 293                  */
 294 #ifdef CONFIG_SMP
 295                 seq_printf(m, "processor\t: %d\n", i);
 296 #endif
 297         }
 298
 299         /* dump out the processor features */
 300         seq_puts(m, "Features\t: ");
 301
 302         for (i = 0; hwcap_str[i]; i++)
 303                 if (elf_hwcap & (1 << i))
 304                         seq_printf(m, "%s ", hwcap_str[i]);
 305
 306         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 307         seq_printf(m, "CPU architecture: AArch64\n");
 308         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 309         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 310         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 311
 312         seq_puts(m, "\n");
 313
 314         seq_printf(m, "Hardware\t: %s\n", machine_name);
 315
 316         return 0;
 317 }
 318
 319 static void *c_start(struct seq_file *m, loff_t *pos)
 320 {
 321         return *pos < 1 ? (void *)1 : NULL;
 322 }
 323
 324 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 325 {
 326         ++*pos;
 327         return NULL;
 328 }
 329
 330 static void c_stop(struct seq_file *m, void *v)
 331 {
 332 }
 333
 334 const struct seq_operations cpuinfo_op = {
 335         .start  = c_start,
 336         .next   = c_next,
 337         .stop   = c_stop,
 338         .show   = c_show
 339 };