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