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/fixmap.h>
  46 #include <asm/cputype.h>
  47 #include <asm/elf.h>
  48 #include <asm/cputable.h>
  49 #include <asm/cpu_ops.h>
  50 #include <asm/sections.h>
  51 #include <asm/setup.h>
  52 #include <asm/smp_plat.h>
  53 #include <asm/cacheflush.h>
  54 #include <asm/tlbflush.h>
  55 #include <asm/traps.h>
  56 #include <asm/memblock.h>
  57 #include <asm/psci.h>
  58
  59 unsigned int processor_id;
  60 EXPORT_SYMBOL(processor_id);
  61
  62 unsigned long elf_hwcap __read_mostly;
  63 EXPORT_SYMBOL_GPL(elf_hwcap);
  64
  65 static const char *cpu_name;
  66 static const char *machine_name;
  67 phys_addr_t __fdt_pointer __initdata;
  68
  69 /*
  70  * Standard memory resources
  71  */
  72 static struct resource mem_res[] = {
  73         {
  74                 .name = "Kernel code",
  75                 .start = 0,
  76                 .end = 0,
  77                 .flags = IORESOURCE_MEM
  78         },
  79         {
  80                 .name = "Kernel data",
  81                 .start = 0,
  82                 .end = 0,
  83                 .flags = IORESOURCE_MEM
  84         }
  85 };
  86
  87 #define kernel_code mem_res[0]
  88 #define kernel_data mem_res[1]
  89
  90 void __init early_print(const char *str, ...)
  91 {
  92         char buf[256];
  93         va_list ap;
  94
  95         va_start(ap, str);
  96         vsnprintf(buf, sizeof(buf), str, ap);
  97         va_end(ap);
  98
  99         printk("%s", buf);
 100 }
 101
 102 void __init smp_setup_processor_id(void)
 103 {
 104         /*
 105          * clear __my_cpu_offset on boot CPU to avoid hang caused by
 106          * using percpu variable early, for example, lockdep will
 107          * access percpu variable inside lock_release
 108          */
 109         set_my_cpu_offset(0);
 110 }
 111
 112 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
 113 {
 114         return phys_id == cpu_logical_map(cpu);
 115 }
 116
 117 static void __init setup_processor(void)
 118 {
 119         struct cpu_info *cpu_info;
 120
 121         cpu_info = lookup_processor_type(read_cpuid_id());
 122         if (!cpu_info) {
 123                 printk("CPU configuration botched (ID %08x), unable to continue.\n",
 124                        read_cpuid_id());
 125                 while (1);
 126         }
 127
 128         cpu_name = cpu_info->cpu_name;
 129
 130         printk("CPU: %s [%08x] revision %d\n",
 131                cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
 132
 133         sprintf(init_utsname()->machine, "aarch64");
 134         elf_hwcap = 0;
 135 }
 136
 137 static void __init setup_machine_fdt(phys_addr_t dt_phys)
 138 {
 139         struct boot_param_header *devtree;
 140         unsigned long dt_root;
 141
 142         /* Check we have a non-NULL DT pointer */
 143         if (!dt_phys) {
 144                 early_print("\n"
 145                         "Error: NULL or invalid device tree blob\n"
 146                         "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
 147                         "\nPlease check your bootloader.\n");
 148
 149                 while (true)
 150                         cpu_relax();
 151
 152         }
 153
 154         devtree = phys_to_virt(dt_phys);
 155
 156         /* Check device tree validity */
 157         if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
 158                 early_print("\n"
 159                         "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
 160                         "Expected 0x%x, found 0x%x\n"
 161                         "\nPlease check your bootloader.\n",
 162                         dt_phys, devtree, OF_DT_HEADER,
 163                         be32_to_cpu(devtree->magic));
 164
 165                 while (true)
 166                         cpu_relax();
 167         }
 168
 169         initial_boot_params = devtree;
 170         dt_root = of_get_flat_dt_root();
 171
 172         machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
 173         if (!machine_name)
 174                 machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
 175         if (!machine_name)
 176                 machine_name = "<unknown>";
 177         pr_info("Machine: %s\n", machine_name);
 178
 179         /* Retrieve various information from the /chosen node */
 180         of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
 181         /* Initialize {size,address}-cells info */
 182         of_scan_flat_dt(early_init_dt_scan_root, NULL);
 183         /* Setup memory, calling early_init_dt_add_memory_arch */
 184         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 185 }
 186
 187 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 188 {
 189         base &= PAGE_MASK;
 190         size &= PAGE_MASK;
 191         if (base + size < PHYS_OFFSET) {
 192                 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
 193                            base, base + size);
 194                 return;
 195         }
 196         if (base < PHYS_OFFSET) {
 197                 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
 198                            base, PHYS_OFFSET);
 199                 size -= PHYS_OFFSET - base;
 200                 base = PHYS_OFFSET;
 201         }
 202         memblock_add(base, size);
 203 }
 204
 205 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 206 {
 207         return __va(memblock_alloc(size, align));
 208 }
 209
 210 /*
 211  * Limit the memory size that was specified via FDT.
 212  */
 213 static int __init early_mem(char *p)
 214 {
 215         phys_addr_t limit;
 216
 217         if (!p)
 218                 return 1;
 219
 220         limit = memparse(p, &p) & PAGE_MASK;
 221         pr_notice("Memory limited to %lldMB\n", limit >> 20);
 222
 223         memblock_enforce_memory_limit(limit);
 224
 225         return 0;
 226 }
 227 early_param("mem", early_mem);
 228
 229 static void __init request_standard_resources(void)
 230 {
 231         struct memblock_region *region;
 232         struct resource *res;
 233
 234         kernel_code.start   = virt_to_phys(_text);
 235         kernel_code.end     = virt_to_phys(_etext - 1);
 236         kernel_data.start   = virt_to_phys(_sdata);
 237         kernel_data.end     = virt_to_phys(_end - 1);
 238
 239         for_each_memblock(memory, region) {
 240                 res = alloc_bootmem_low(sizeof(*res));
 241                 res->name  = "System RAM";
 242                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 243                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 244                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 245
 246                 request_resource(&iomem_resource, res);
 247
 248                 if (kernel_code.start >= res->start &&
 249                     kernel_code.end <= res->end)
 250                         request_resource(res, &kernel_code);
 251                 if (kernel_data.start >= res->start &&
 252                     kernel_data.end <= res->end)
 253                         request_resource(res, &kernel_data);
 254         }
 255 }
 256
 257 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
 258
 259 void __init setup_arch(char **cmdline_p)
 260 {
 261         setup_processor();
 262
 263         setup_machine_fdt(__fdt_pointer);
 264
 265         init_mm.start_code = (unsigned long) _text;
 266         init_mm.end_code   = (unsigned long) _etext;
 267         init_mm.end_data   = (unsigned long) _edata;
 268         init_mm.brk        = (unsigned long) _end;
 269
 270         *cmdline_p = boot_command_line;
 271
 272         init_mem_pgprot();
 273         early_ioremap_init();
 274
 275         parse_early_param();
 276
 277         arm64_memblock_init();
 278
 279         paging_init();
 280         request_standard_resources();
 281
 282         unflatten_device_tree();
 283
 284         psci_init();
 285
 286         cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
 287         cpu_read_bootcpu_ops();
 288 #ifdef CONFIG_SMP
 289         smp_init_cpus();
 290 #endif
 291
 292 #ifdef CONFIG_VT
 293 #if defined(CONFIG_VGA_CONSOLE)
 294         conswitchp = &vga_con;
 295 #elif defined(CONFIG_DUMMY_CONSOLE)
 296         conswitchp = &dummy_con;
 297 #endif
 298 #endif
 299 }
 300
 301 static int __init arm64_device_init(void)
 302 {
 303         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 304         return 0;
 305 }
 306 arch_initcall(arm64_device_init);
 307
 308 static DEFINE_PER_CPU(struct cpu, cpu_data);
 309
 310 static int __init topology_init(void)
 311 {
 312         int i;
 313
 314         for_each_possible_cpu(i) {
 315                 struct cpu *cpu = &per_cpu(cpu_data, i);
 316                 cpu->hotpluggable = 1;
 317                 register_cpu(cpu, i);
 318         }
 319
 320         return 0;
 321 }
 322 subsys_initcall(topology_init);
 323
 324 static const char *hwcap_str[] = {
 325         "fp",
 326         "asimd",
 327         NULL
 328 };
 329
 330 static int c_show(struct seq_file *m, void *v)
 331 {
 332         int i;
 333
 334         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 335                    cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
 336
 337         for_each_online_cpu(i) {
 338                 /*
 339                  * glibc reads /proc/cpuinfo to determine the number of
 340                  * online processors, looking for lines beginning with
 341                  * "processor".  Give glibc what it expects.
 342                  */
 343 #ifdef CONFIG_SMP
 344                 seq_printf(m, "processor\t: %d\n", i);
 345 #endif
 346         }
 347
 348         /* dump out the processor features */
 349         seq_puts(m, "Features\t: ");
 350
 351         for (i = 0; hwcap_str[i]; i++)
 352                 if (elf_hwcap & (1 << i))
 353                         seq_printf(m, "%s ", hwcap_str[i]);
 354
 355         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 356         seq_printf(m, "CPU architecture: AArch64\n");
 357         seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
 358         seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
 359         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 360
 361         seq_puts(m, "\n");
 362
 363         seq_printf(m, "Hardware\t: %s\n", machine_name);
 364
 365         return 0;
 366 }
 367
 368 static void *c_start(struct seq_file *m, loff_t *pos)
 369 {
 370         return *pos < 1 ? (void *)1 : NULL;
 371 }
 372
 373 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 374 {
 375         ++*pos;
 376         return NULL;
 377 }
 378
 379 static void c_stop(struct seq_file *m, void *v)
 380 {
 381 }
 382
 383 const struct seq_operations cpuinfo_op = {
 384         .start  = c_start,
 385         .next   = c_next,
 386         .stop   = c_stop,
 387         .show   = c_show
 388 };