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 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 102 {
 103         return phys_id == cpu_logical_map(cpu);
 104 }
 105
 106 static void __init setup_processor(void)
 107 {
 108         struct cpu_info *cpu_info;
 109
 110         /*
 111          * locate processor in the list of supported processor
 112          * types.  The linker builds this table for us from the
 113          * entries in arch/arm/mm/proc.S
 114          */
 115         cpu_info = lookup_processor_type(read_cpuid_id());
 116         if (!cpu_info) {
 117                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 118                        read_cpuid_id());
 119                 while (1);
 120         }
 121
 122         cpu_name = cpu_info->cpu_name;
 123
 124         printk("CPU: %s [%08x] revision %d\n",
 125                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 126
 127         sprintf(init_utsname()->machine, "aarch64");
 128         elf_hwcap = 0;
 129 }
 130
 131 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 132 {
 133         struct boot_param_header *devtree;
 134         unsigned long dt_root;
 135
 136         /* Check we have a non-NULL DT pointer */
 137         if (!dt_phys) {
 138                 early_print("\n"
 139                         "Error: NULL or invalid device tree blob\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
 143                 while (true)
 144                         cpu_relax();
 145
 146         }
 147
 148         devtree = phys_to_virt(dt_phys);
 149
 150         /* Check device tree validity */
 151         if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
 152                 early_print("\n"
 153                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 154                         "Expected 0x%x, found 0x%x\n"
 155                         "\nPlease check your bootloader.\n",
 156                         dt_phys, devtree, OF_DT_HEADER,
 157                         be32_to_cpu(devtree->magic));
 158
 159                 while (true)
 160                         cpu_relax();
 161         }
 162
 163         initial_boot_params = devtree;
 164         dt_root = of_get_flat_dt_root();
 165
 166         machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
 167         if (!machine_name)
 168                 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
 169         if (!machine_name)
 170                 machine_name = "<unknown>";
 171         pr_info("Machine: %s\n", machine_name);
 172
 173         /* Retrieve various information from the /chosen node */
 174         of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
 175         /* Initialize {size,address}-cells info */
 176         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 177         /* Setup memory, calling early_init_dt_add_memory_arch */
 178         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 179 }
 180
 181 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 182 {
 183         base &= PAGE_MASK;
 184         size &= PAGE_MASK;
 185         if (base + size < PHYS_OFFSET) {
 186                 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
 187                            base, base + size);
 188                 return;
 189         }
 190         if (base < PHYS_OFFSET) {
 191                 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
 192                            base, PHYS_OFFSET);
 193                 size -= PHYS_OFFSET - base;
 194                 base = PHYS_OFFSET;
 195         }
 196         memblock_add(base, size);
 197 }
 198
 199 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 200 {
 201         return __va(memblock_alloc(size, align));
 202 }
 203
 204 /*
 205  * Limit the memory size that was specified via FDT.
 206  */
 207 static int __init early_mem(char *p)
 208 {
 209         phys_addr_t limit;
 210
 211         if (!p)
 212                 return 1;
 213
 214         limit = memparse(p, &p) & PAGE_MASK;
 215         pr_notice("Memory limited to %lldMB\n", limit >> 20);
 216
 217         memblock_enforce_memory_limit(limit);
 218
 219         return 0;
 220 }
 221 early_param("mem", early_mem);
 222
 223 static void __init request_standard_resources(void)
 224 {
 225         struct memblock_region *region;
 226         struct resource *res;
 227
 228         kernel_code.start   = virt_to_phys(_text);
 229         kernel_code.end     = virt_to_phys(_etext - 1);
 230         kernel_data.start   = virt_to_phys(_sdata);
 231         kernel_data.end     = virt_to_phys(_end - 1);
 232
 233         for_each_memblock(memory, region) {
 234                 res = alloc_bootmem_low(sizeof(*res));
 235                 res->name  = "System RAM";
 236                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 237                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 238                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 239
 240                 request_resource(&iomem_resource, res);
 241
 242                 if (kernel_code.start >= res->start &&
 243                     kernel_code.end <= res->end)
 244                         request_resource(res, &kernel_code);
 245                 if (kernel_data.start >= res->start &&
 246                     kernel_data.end <= res->end)
 247                         request_resource(res, &kernel_data);
 248         }
 249 }
 250
 251 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 252
 253 void __init setup_arch(char **cmdline_p)
 254 {
 255         setup_processor();
 256
 257         setup_machine_fdt(__fdt_pointer);
 258
 259         init_mm.start_code = (unsigned long) _text;
 260         init_mm.end_code   = (unsigned long) _etext;
 261         init_mm.end_data   = (unsigned long) _edata;
 262         init_mm.brk        = (unsigned long) _end;
 263
 264         *cmdline_p = boot_command_line;
 265
 266         parse_early_param();
 267
 268         arm64_memblock_init();
 269
 270         paging_init();
 271         request_standard_resources();
 272
 273         unflatten_device_tree();
 274
 275         psci_init();
 276
 277         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 278         cpu_read_bootcpu_ops();
 279 #ifdef CONFIG_SMP
 280         smp_init_cpus();
 281 #endif
 282
 283 #ifdef CONFIG_VT
 284 #if defined(CONFIG_VGA_CONSOLE)
 285         conswitchp = &vga_con;
 286 #elif defined(CONFIG_DUMMY_CONSOLE)
 287         conswitchp = &dummy_con;
 288 #endif
 289 #endif
 290 }
 291
 292 static int __init arm64_device_init(void)
 293 {
 294         of_clk_init(NULL);
 295         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 296         return 0;
 297 }
 298 arch_initcall(arm64_device_init);
 299
 300 static DEFINE_PER_CPU(struct cpu, cpu_data);
 301
 302 static int __init topology_init(void)
 303 {
 304         int i;
 305
 306         for_each_possible_cpu(i) {
 307                 struct cpu *cpu = &per_cpu(cpu_data, i);
 308                 cpu->hotpluggable = 1;
 309                 register_cpu(cpu, i);
 310         }
 311
 312         return 0;
 313 }
 314 subsys_initcall(topology_init);
 315
 316 static const char *hwcap_str[] = {
 317         "fp",
 318         "asimd",
 319         NULL
 320 };
 321
 322 static int c_show(struct seq_file *m, void *v)
 323 {
 324         int i;
 325
 326         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 327                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 328
 329         for_each_online_cpu(i) {
 330                 /*
 331                  * glibc reads /proc/cpuinfo to determine the number of
 332                  * online processors, looking for lines beginning with
 333                  * "processor".  Give glibc what it expects.
 334                  */
 335 #ifdef CONFIG_SMP
 336                 seq_printf(m, "processor\t: %d\n", i);
 337 #endif
 338         }
 339
 340         /* dump out the processor features */
 341         seq_puts(m, "Features\t: ");
 342
 343         for (i = 0; hwcap_str[i]; i++)
 344                 if (elf_hwcap & (1 << i))
 345                         seq_printf(m, "%s ", hwcap_str[i]);
 346
 347         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 348         seq_printf(m, "CPU architecture: AArch64\n");
 349         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 350         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 351         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 352
 353         seq_puts(m, "\n");
 354
 355         seq_printf(m, "Hardware\t: %s\n", machine_name);
 356
 357         return 0;
 358 }
 359
 360 static void *c_start(struct seq_file *m, loff_t *pos)
 361 {
 362         return *pos < 1 ? (void *)1 : NULL;
 363 }
 364
 365 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 366 {
 367         ++*pos;
 368         return NULL;
 369 }
 370
 371 static void c_stop(struct seq_file *m, void *v)
 372 {
 373 }
 374
 375 const struct seq_operations cpuinfo_op = {
 376         .start  = c_start,
 377         .next   = c_next,
 378         .stop   = c_stop,
 379         .show   = c_show
 380 };