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 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 };