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         struct boot_param_header *devtree;
 138         unsigned long dt_root;
 139
 140         /* Check we have a non-NULL DT pointer */
 141         if (!dt_phys) {
 142                 early_print("\n"
 143                         "Error: NULL or invalid device tree blob\n"
 144                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 145                         "\nPlease check your bootloader.\n");
 146
 147                 while (true)
 148                         cpu_relax();
 149
 150         }
 151
 152         devtree = phys_to_virt(dt_phys);
 153
 154         /* Check device tree validity */
 155         if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
 156                 early_print("\n"
 157                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 158                         "Expected 0x%x, found 0x%x\n"
 159                         "\nPlease check your bootloader.\n",
 160                         dt_phys, devtree, OF_DT_HEADER,
 161                         be32_to_cpu(devtree->magic));
 162
 163                 while (true)
 164                         cpu_relax();
 165         }
 166
 167         initial_boot_params = devtree;
 168         dt_root = of_get_flat_dt_root();
 169
 170         machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
 171         if (!machine_name)
 172                 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
 173         if (!machine_name)
 174                 machine_name = "<unknown>";
 175         pr_info("Machine: %s\n", machine_name);
 176
 177         /* Retrieve various information from the /chosen node */
 178         of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
 179         /* Initialize {size,address}-cells info */
 180         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 181         /* Setup memory, calling early_init_dt_add_memory_arch */
 182         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 183 }
 184
 185 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 186 {
 187         base &= PAGE_MASK;
 188         size &= PAGE_MASK;
 189         if (base + size < PHYS_OFFSET) {
 190                 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
 191                            base, base + size);
 192                 return;
 193         }
 194         if (base < PHYS_OFFSET) {
 195                 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
 196                            base, PHYS_OFFSET);
 197                 size -= PHYS_OFFSET - base;
 198                 base = PHYS_OFFSET;
 199         }
 200         memblock_add(base, size);
 201 }
 202
 203 /*
 204  * Limit the memory size that was specified via FDT.
 205  */
 206 static int __init early_mem(char *p)
 207 {
 208         phys_addr_t limit;
 209
 210         if (!p)
 211                 return 1;
 212
 213         limit = memparse(p, &p) & PAGE_MASK;
 214         pr_notice("Memory limited to %lldMB\n", limit >> 20);
 215
 216         memblock_enforce_memory_limit(limit);
 217
 218         return 0;
 219 }
 220 early_param("mem", early_mem);
 221
 222 static void __init request_standard_resources(void)
 223 {
 224         struct memblock_region *region;
 225         struct resource *res;
 226
 227         kernel_code.start   = virt_to_phys(_text);
 228         kernel_code.end     = virt_to_phys(_etext - 1);
 229         kernel_data.start   = virt_to_phys(_sdata);
 230         kernel_data.end     = virt_to_phys(_end - 1);
 231
 232         for_each_memblock(memory, region) {
 233                 res = alloc_bootmem_low(sizeof(*res));
 234                 res->name  = "System RAM";
 235                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 236                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 237                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 238
 239                 request_resource(&iomem_resource, res);
 240
 241                 if (kernel_code.start >= res->start &&
 242                     kernel_code.end <= res->end)
 243                         request_resource(res, &kernel_code);
 244                 if (kernel_data.start >= res->start &&
 245                     kernel_data.end <= res->end)
 246                         request_resource(res, &kernel_data);
 247         }
 248 }
 249
 250 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 251
 252 void __init setup_arch(char **cmdline_p)
 253 {
 254         setup_processor();
 255
 256         setup_machine_fdt(__fdt_pointer);
 257
 258         init_mm.start_code = (unsigned long) _text;
 259         init_mm.end_code   = (unsigned long) _etext;
 260         init_mm.end_data   = (unsigned long) _edata;
 261         init_mm.brk        = (unsigned long) _end;
 262
 263         *cmdline_p = boot_command_line;
 264
 265         parse_early_param();
 266
 267         arm64_memblock_init();
 268
 269         paging_init();
 270         request_standard_resources();
 271
 272         unflatten_device_tree();
 273
 274         psci_init();
 275
 276         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 277 #ifdef CONFIG_SMP
 278         smp_init_cpus();
 279 #endif
 280
 281 #ifdef CONFIG_VT
 282 #if defined(CONFIG_VGA_CONSOLE)
 283         conswitchp = &vga_con;
 284 #elif defined(CONFIG_DUMMY_CONSOLE)
 285         conswitchp = &dummy_con;
 286 #endif
 287 #endif
 288 }
 289
 290 static int __init arm64_device_init(void)
 291 {
 292         of_clk_init(NULL);
 293         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 294         return 0;
 295 }
 296 arch_initcall(arm64_device_init);
 297
 298 static DEFINE_PER_CPU(struct cpu, cpu_data);
 299
 300 static int __init topology_init(void)
 301 {
 302         int i;
 303
 304         for_each_possible_cpu(i) {
 305                 struct cpu *cpu = &per_cpu(cpu_data, i);
 306                 cpu->hotpluggable = 1;
 307                 register_cpu(cpu, i);
 308         }
 309
 310         return 0;
 311 }
 312 subsys_initcall(topology_init);
 313
 314 static const char *hwcap_str[] = {
 315         "fp",
 316         "asimd",
 317         "evtstrm",
 318         NULL
 319 };
 320
 321 static int c_show(struct seq_file *m, void *v)
 322 {
 323         int i;
 324
 325         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 326                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 327
 328         for_each_online_cpu(i) {
 329                 /*
 330                  * glibc reads /proc/cpuinfo to determine the number of
 331                  * online processors, looking for lines beginning with
 332                  * "processor".  Give glibc what it expects.
 333                  */
 334 #ifdef CONFIG_SMP
 335                 seq_printf(m, "processor\t: %d\n", i);
 336 #endif
 337         }
 338
 339         /* dump out the processor features */
 340         seq_puts(m, "Features\t: ");
 341
 342         for (i = 0; hwcap_str[i]; i++)
 343                 if (elf_hwcap & (1 << i))
 344                         seq_printf(m, "%s ", hwcap_str[i]);
 345
 346         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 347         seq_printf(m, "CPU architecture: AArch64\n");
 348         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 349         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 350         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 351
 352         seq_puts(m, "\n");
 353
 354         seq_printf(m, "Hardware\t: %s\n", machine_name);
 355
 356         return 0;
 357 }
 358
 359 static void *c_start(struct seq_file *m, loff_t *pos)
 360 {
 361         return *pos < 1 ? (void *)1 : NULL;
 362 }
 363
 364 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 365 {
 366         ++*pos;
 367         return NULL;
 368 }
 369
 370 static void c_stop(struct seq_file *m, void *v)
 371 {
 372 }
 373
 374 const struct seq_operations cpuinfo_op = {
 375         .start  = c_start,
 376         .next   = c_next,
 377         .stop   = c_stop,
 378         .show   = c_show
 379 };