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/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 #ifdef CONFIG_COMPAT
  64 #define COMPAT_ELF_HWCAP_DEFAULT        \
  65                                 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
  66                                  COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
  67                                  COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
  68                                  COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
  69                                  COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
  70 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
  71 #endif
  72
  73 static const char *cpu_name;
  74 static const char *machine_name;
  75 phys_addr_t __fdt_pointer __initdata;
  76
  77 /*
  78  * Standard memory resources
  79  */
  80 static struct resource mem_res[] = {
  81         {
  82                 .name = "Kernel code",
  83                 .start = 0,
  84                 .end = 0,
  85                 .flags = IORESOURCE_MEM
  86         },
  87         {
  88                 .name = "Kernel data",
  89                 .start = 0,
  90                 .end = 0,
  91                 .flags = IORESOURCE_MEM
  92         }
  93 };
  94
  95 #define kernel_code mem_res[0]
  96 #define kernel_data mem_res[1]
  97
  98 void __init early_print(const char *str, ...)
  99 {
 100         char buf[256];
 101         va_list ap;
 102
 103         va_start(ap, str);
 104         vsnprintf(buf, sizeof(buf), str, ap);
 105         va_end(ap);
 106
 107         printk("%s", buf);
 108 }
 109
 110 static void __init setup_processor(void)
 111 {
 112         struct cpu_info *cpu_info;
 113
 114         /*
 115          * locate processor in the list of supported processor
 116          * types.  The linker builds this table for us from the
 117          * entries in arch/arm/mm/proc.S
 118          */
 119         cpu_info = lookup_processor_type(read_cpuid_id());
 120         if (!cpu_info) {
 121                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 122                        read_cpuid_id());
 123                 while (1);
 124         }
 125
 126         cpu_name = cpu_info->cpu_name;
 127
 128         printk("CPU: %s [%08x] revision %d\n",
 129                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 130
 131         sprintf(init_utsname()->machine, "aarch64");
 132         elf_hwcap = 0;
 133 }
 134
 135 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 136 {
 137         if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
 138                 early_print("\n"
 139                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 140                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 141                         "\nPlease check your bootloader.\n",
 142                         dt_phys, phys_to_virt(dt_phys));
 143
 144                 while (true)
 145                         cpu_relax();
 146         }
 147
 148         machine_name = of_flat_dt_get_machine_name();
 149 }
 150
 151 /*
 152  * Limit the memory size that was specified via FDT.
 153  */
 154 static int __init early_mem(char *p)
 155 {
 156         phys_addr_t limit;
 157
 158         if (!p)
 159                 return 1;
 160
 161         limit = memparse(p, &p) & PAGE_MASK;
 162         pr_notice("Memory limited to %lldMB\n", limit >> 20);
 163
 164         memblock_enforce_memory_limit(limit);
 165
 166         return 0;
 167 }
 168 early_param("mem", early_mem);
 169
 170 static void __init request_standard_resources(void)
 171 {
 172         struct memblock_region *region;
 173         struct resource *res;
 174
 175         kernel_code.start   = virt_to_phys(_text);
 176         kernel_code.end     = virt_to_phys(_etext - 1);
 177         kernel_data.start   = virt_to_phys(_sdata);
 178         kernel_data.end     = virt_to_phys(_end - 1);
 179
 180         for_each_memblock(memory, region) {
 181                 res = alloc_bootmem_low(sizeof(*res));
 182                 res->name  = "System RAM";
 183                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 184                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 185                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 186
 187                 request_resource(&iomem_resource, res);
 188
 189                 if (kernel_code.start >= res->start &&
 190                     kernel_code.end <= res->end)
 191                         request_resource(res, &kernel_code);
 192                 if (kernel_data.start >= res->start &&
 193                     kernel_data.end <= res->end)
 194                         request_resource(res, &kernel_data);
 195         }
 196 }
 197
 198 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 199
 200 void __init setup_arch(char **cmdline_p)
 201 {
 202         setup_processor();
 203
 204         setup_machine_fdt(__fdt_pointer);
 205
 206         init_mm.start_code = (unsigned long) _text;
 207         init_mm.end_code   = (unsigned long) _etext;
 208         init_mm.end_data   = (unsigned long) _edata;
 209         init_mm.brk        = (unsigned long) _end;
 210
 211         *cmdline_p = boot_command_line;
 212
 213         parse_early_param();
 214
 215         arm64_memblock_init();
 216
 217         paging_init();
 218         request_standard_resources();
 219
 220         unflatten_device_tree();
 221
 222         psci_init();
 223
 224         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 225 #ifdef CONFIG_SMP
 226         smp_init_cpus();
 227 #endif
 228
 229 #ifdef CONFIG_VT
 230 #if defined(CONFIG_VGA_CONSOLE)
 231         conswitchp = &vga_con;
 232 #elif defined(CONFIG_DUMMY_CONSOLE)
 233         conswitchp = &dummy_con;
 234 #endif
 235 #endif
 236 }
 237
 238 static int __init arm64_device_init(void)
 239 {
 240         of_clk_init(NULL);
 241         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 242         return 0;
 243 }
 244 arch_initcall(arm64_device_init);
 245
 246 static DEFINE_PER_CPU(struct cpu, cpu_data);
 247
 248 static int __init topology_init(void)
 249 {
 250         int i;
 251
 252         for_each_possible_cpu(i) {
 253                 struct cpu *cpu = &per_cpu(cpu_data, i);
 254                 cpu->hotpluggable = 1;
 255                 register_cpu(cpu, i);
 256         }
 257
 258         return 0;
 259 }
 260 subsys_initcall(topology_init);
 261
 262 static const char *hwcap_str[] = {
 263         "fp",
 264         "asimd",
 265         "evtstrm",
 266         NULL
 267 };
 268
 269 static int c_show(struct seq_file *m, void *v)
 270 {
 271         int i;
 272
 273         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 274                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 275
 276         for_each_online_cpu(i) {
 277                 /*
 278                  * glibc reads /proc/cpuinfo to determine the number of
 279                  * online processors, looking for lines beginning with
 280                  * "processor".  Give glibc what it expects.
 281                  */
 282 #ifdef CONFIG_SMP
 283                 seq_printf(m, "processor\t: %d\n", i);
 284 #endif
 285         }
 286
 287         /* dump out the processor features */
 288         seq_puts(m, "Features\t: ");
 289
 290         for (i = 0; hwcap_str[i]; i++)
 291                 if (elf_hwcap & (1 << i))
 292                         seq_printf(m, "%s ", hwcap_str[i]);
 293
 294         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 295         seq_printf(m, "CPU architecture: AArch64\n");
 296         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 297         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 298         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 299
 300         seq_puts(m, "\n");
 301
 302         seq_printf(m, "Hardware\t: %s\n", machine_name);
 303
 304         return 0;
 305 }
 306
 307 static void *c_start(struct seq_file *m, loff_t *pos)
 308 {
 309         return *pos < 1 ? (void *)1 : NULL;
 310 }
 311
 312 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 313 {
 314         ++*pos;
 315         return NULL;
 316 }
 317
 318 static void c_stop(struct seq_file *m, void *v)
 319 {
 320 }
 321
 322 const struct seq_operations cpuinfo_op = {
 323         .start  = c_start,
 324         .next   = c_next,
 325         .stop   = c_stop,
 326         .show   = c_show
 327 };