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 static const char *cpu_name;
  65 static const char *machine_name;
  66 phys_addr_t __fdt_pointer __initdata;
  67
  68 /*
  69  * Standard memory resources
  70  */
  71 static struct resource mem_res[] = {
  72         {
  73                 .name = "Kernel code",
  74                 .start = 0,
  75                 .end = 0,
  76                 .flags = IORESOURCE_MEM
  77         },
  78         {
  79                 .name = "Kernel data",
  80                 .start = 0,
  81                 .end = 0,
  82                 .flags = IORESOURCE_MEM
  83         }
  84 };
  85
  86 #define kernel_code mem_res[0]
  87 #define kernel_data mem_res[1]
  88
  89 void __init early_print(const char *str, ...)
  90 {
  91         char buf[256];
  92         va_list ap;
  93
  94         va_start(ap, str);
  95         vsnprintf(buf, sizeof(buf), str, ap);
  96         va_end(ap);
  97
  98         printk("%s", buf);
  99 }
 100
 101 void __init smp_setup_processor_id(void)
 102 {
 103         /*
 104          * clear __my_cpu_offset on boot CPU to avoid hang caused by
 105          * using percpu variable early, for example, lockdep will
 106          * access percpu variable inside lock_release
 107          */
 108         set_my_cpu_offset(0);
 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         cpu_info = lookup_processor_type(read_cpuid_id());
 121         if (!cpu_info) {
 122                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 123                        read_cpuid_id());
 124                 while (1);
 125         }
 126
 127         cpu_name = cpu_info->cpu_name;
 128
 129         printk("CPU: %s [%08x] revision %d\n",
 130                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 131
 132         sprintf(init_utsname()->machine, "aarch64");
 133         elf_hwcap = 0;
 134 }
 135
 136 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 137 {
 138         struct boot_param_header *devtree;
 139         unsigned long dt_root;
 140
 141         /* Check we have a non-NULL DT pointer */
 142         if (!dt_phys) {
 143                 early_print("\n"
 144                         "Error: NULL or invalid device tree blob\n"
 145                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 146                         "\nPlease check your bootloader.\n");
 147
 148                 while (true)
 149                         cpu_relax();
 150
 151         }
 152
 153         devtree = phys_to_virt(dt_phys);
 154
 155         /* Check device tree validity */
 156         if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
 157                 early_print("\n"
 158                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 159                         "Expected 0x%x, found 0x%x\n"
 160                         "\nPlease check your bootloader.\n",
 161                         dt_phys, devtree, OF_DT_HEADER,
 162                         be32_to_cpu(devtree->magic));
 163
 164                 while (true)
 165                         cpu_relax();
 166         }
 167
 168         initial_boot_params = devtree;
 169         dt_root = of_get_flat_dt_root();
 170
 171         machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
 172         if (!machine_name)
 173                 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
 174         if (!machine_name)
 175                 machine_name = "<unknown>";
 176         pr_info("Machine: %s\n", machine_name);
 177
 178         /* Retrieve various information from the /chosen node */
 179         of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
 180         /* Initialize {size,address}-cells info */
 181         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 182         /* Setup memory, calling early_init_dt_add_memory_arch */
 183         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 184 }
 185
 186 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 187 {
 188         base &= PAGE_MASK;
 189         size &= PAGE_MASK;
 190         if (base + size < PHYS_OFFSET) {
 191                 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
 192                            base, base + size);
 193                 return;
 194         }
 195         if (base < PHYS_OFFSET) {
 196                 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
 197                            base, PHYS_OFFSET);
 198                 size -= PHYS_OFFSET - base;
 199                 base = PHYS_OFFSET;
 200         }
 201         memblock_add(base, size);
 202 }
 203
 204 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 205 {
 206         return __va(memblock_alloc(size, align));
 207 }
 208
 209 /*
 210  * Limit the memory size that was specified via FDT.
 211  */
 212 static int __init early_mem(char *p)
 213 {
 214         phys_addr_t limit;
 215
 216         if (!p)
 217                 return 1;
 218
 219         limit = memparse(p, &p) & PAGE_MASK;
 220         pr_notice("Memory limited to %lldMB\n", limit >> 20);
 221
 222         memblock_enforce_memory_limit(limit);
 223
 224         return 0;
 225 }
 226 early_param("mem", early_mem);
 227
 228 static void __init request_standard_resources(void)
 229 {
 230         struct memblock_region *region;
 231         struct resource *res;
 232
 233         kernel_code.start   = virt_to_phys(_text);
 234         kernel_code.end     = virt_to_phys(_etext - 1);
 235         kernel_data.start   = virt_to_phys(_sdata);
 236         kernel_data.end     = virt_to_phys(_end - 1);
 237
 238         for_each_memblock(memory, region) {
 239                 res = alloc_bootmem_low(sizeof(*res));
 240                 res->name  = "System RAM";
 241                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 242                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 243                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 244
 245                 request_resource(&iomem_resource, res);
 246
 247                 if (kernel_code.start >= res->start &&
 248                     kernel_code.end <= res->end)
 249                         request_resource(res, &kernel_code);
 250                 if (kernel_data.start >= res->start &&
 251                     kernel_data.end <= res->end)
 252                         request_resource(res, &kernel_data);
 253         }
 254 }
 255
 256 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 257
 258 void __init setup_arch(char **cmdline_p)
 259 {
 260         setup_processor();
 261
 262         setup_machine_fdt(__fdt_pointer);
 263
 264         init_mm.start_code = (unsigned long) _text;
 265         init_mm.end_code   = (unsigned long) _etext;
 266         init_mm.end_data   = (unsigned long) _edata;
 267         init_mm.brk        = (unsigned long) _end;
 268
 269         *cmdline_p = boot_command_line;
 270
 271         init_mem_pgprot();
 272
 273         parse_early_param();
 274
 275         arm64_memblock_init();
 276
 277         paging_init();
 278         request_standard_resources();
 279
 280         unflatten_device_tree();
 281
 282         psci_init();
 283
 284         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 285         cpu_read_bootcpu_ops();
 286 #ifdef CONFIG_SMP
 287         smp_init_cpus();
 288 #endif
 289
 290 #ifdef CONFIG_VT
 291 #if defined(CONFIG_VGA_CONSOLE)
 292         conswitchp = &vga_con;
 293 #elif defined(CONFIG_DUMMY_CONSOLE)
 294         conswitchp = &dummy_con;
 295 #endif
 296 #endif
 297 }
 298
 299 static int __init arm64_device_init(void)
 300 {
 301         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 302         return 0;
 303 }
 304 arch_initcall(arm64_device_init);
 305
 306 static DEFINE_PER_CPU(struct cpu, cpu_data);
 307
 308 static int __init topology_init(void)
 309 {
 310         int i;
 311
 312         for_each_possible_cpu(i) {
 313                 struct cpu *cpu = &per_cpu(cpu_data, i);
 314                 cpu->hotpluggable = 1;
 315                 register_cpu(cpu, i);
 316         }
 317
 318         return 0;
 319 }
 320 subsys_initcall(topology_init);
 321
 322 static const char *hwcap_str[] = {
 323         "fp",
 324         "asimd",
 325         NULL
 326 };
 327
 328 static int c_show(struct seq_file *m, void *v)
 329 {
 330         int i;
 331
 332         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 333                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 334
 335         for_each_online_cpu(i) {
 336                 /*
 337                  * glibc reads /proc/cpuinfo to determine the number of
 338                  * online processors, looking for lines beginning with
 339                  * "processor".  Give glibc what it expects.
 340                  */
 341 #ifdef CONFIG_SMP
 342                 seq_printf(m, "processor\t: %d\n", i);
 343 #endif
 344         }
 345
 346         /* dump out the processor features */
 347         seq_puts(m, "Features\t: ");
 348
 349         for (i = 0; hwcap_str[i]; i++)
 350                 if (elf_hwcap & (1 << i))
 351                         seq_printf(m, "%s ", hwcap_str[i]);
 352
 353         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 354         seq_printf(m, "CPU architecture: AArch64\n");
 355         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 356         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 357         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 358
 359         seq_puts(m, "\n");
 360
 361         seq_printf(m, "Hardware\t: %s\n", machine_name);
 362
 363         return 0;
 364 }
 365
 366 static void *c_start(struct seq_file *m, loff_t *pos)
 367 {
 368         return *pos < 1 ? (void *)1 : NULL;
 369 }
 370
 371 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 372 {
 373         ++*pos;
 374         return NULL;
 375 }
 376
 377 static void c_stop(struct seq_file *m, void *v)
 378 {
 379 }
 380
 381 const struct seq_operations cpuinfo_op = {
 382         .start  = c_start,
 383         .next   = c_next,
 384         .stop   = c_stop,
 385         .show   = c_show
 386 };