2 * Based on arch/arm/kernel/setup.c
4 * Copyright (C) 1995-2001 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
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>
40 #include <linux/proc_fs.h>
41 #include <linux/memblock.h>
42 #include <linux/of_fdt.h>
43 #include <linux/of_platform.h>
45 #include <asm/cputype.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>
57 unsigned int processor_id;
58 EXPORT_SYMBOL(processor_id);
60 unsigned long elf_hwcap __read_mostly;
61 EXPORT_SYMBOL_GPL(elf_hwcap);
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;
73 static const char *cpu_name;
74 static const char *machine_name;
75 phys_addr_t __fdt_pointer __initdata;
78 * Standard memory resources
80 static struct resource mem_res[] = {
82 .name = "Kernel code",
85 .flags = IORESOURCE_MEM
88 .name = "Kernel data",
91 .flags = IORESOURCE_MEM
95 #define kernel_code mem_res[0]
96 #define kernel_data mem_res[1]
98 void __init early_print(const char *str, ...)
104 vsnprintf(buf, sizeof(buf), str, ap);
110 static void __init setup_processor(void)
112 struct cpu_info *cpu_info;
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
119 cpu_info = lookup_processor_type(read_cpuid_id());
121 printk("CPU configuration botched (ID %08x), unable to continue.\n",
126 cpu_name = cpu_info->cpu_name;
128 printk("CPU: %s [%08x] revision %d\n",
129 cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
131 sprintf(init_utsname()->machine, "aarch64");
135 static void __init setup_machine_fdt(phys_addr_t dt_phys)
137 if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
139 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\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 dt_phys, phys_to_virt(dt_phys));
148 machine_name = of_flat_dt_get_machine_name();
152 * Limit the memory size that was specified via FDT.
154 static int __init early_mem(char *p)
161 limit = memparse(p, &p) & PAGE_MASK;
162 pr_notice("Memory limited to %lldMB\n", limit >> 20);
164 memblock_enforce_memory_limit(limit);
168 early_param("mem", early_mem);
170 static void __init request_standard_resources(void)
172 struct memblock_region *region;
173 struct resource *res;
175 kernel_code.start = virt_to_phys(_text);
176 kernel_code.end = virt_to_phys(_etext - 1);
177 kernel_data.start = virt_to_phys(_sdata);
178 kernel_data.end = virt_to_phys(_end - 1);
180 for_each_memblock(memory, region) {
181 res = alloc_bootmem_low(sizeof(*res));
182 res->name = "System RAM";
183 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
184 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
185 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
187 request_resource(&iomem_resource, res);
189 if (kernel_code.start >= res->start &&
190 kernel_code.end <= res->end)
191 request_resource(res, &kernel_code);
192 if (kernel_data.start >= res->start &&
193 kernel_data.end <= res->end)
194 request_resource(res, &kernel_data);
198 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
200 void __init setup_arch(char **cmdline_p)
204 setup_machine_fdt(__fdt_pointer);
206 init_mm.start_code = (unsigned long) _text;
207 init_mm.end_code = (unsigned long) _etext;
208 init_mm.end_data = (unsigned long) _edata;
209 init_mm.brk = (unsigned long) _end;
211 *cmdline_p = boot_command_line;
215 arm64_memblock_init();
218 request_standard_resources();
220 unflatten_device_tree();
224 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
230 #if defined(CONFIG_VGA_CONSOLE)
231 conswitchp = &vga_con;
232 #elif defined(CONFIG_DUMMY_CONSOLE)
233 conswitchp = &dummy_con;
238 static int __init arm64_device_init(void)
241 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
244 arch_initcall(arm64_device_init);
246 static DEFINE_PER_CPU(struct cpu, cpu_data);
248 static int __init topology_init(void)
252 for_each_possible_cpu(i) {
253 struct cpu *cpu = &per_cpu(cpu_data, i);
254 cpu->hotpluggable = 1;
255 register_cpu(cpu, i);
260 subsys_initcall(topology_init);
262 static const char *hwcap_str[] = {
269 static int c_show(struct seq_file *m, void *v)
273 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
274 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
276 for_each_online_cpu(i) {
278 * glibc reads /proc/cpuinfo to determine the number of
279 * online processors, looking for lines beginning with
280 * "processor". Give glibc what it expects.
283 seq_printf(m, "processor\t: %d\n", i);
287 /* dump out the processor features */
288 seq_puts(m, "Features\t: ");
290 for (i = 0; hwcap_str[i]; i++)
291 if (elf_hwcap & (1 << i))
292 seq_printf(m, "%s ", hwcap_str[i]);
294 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
295 seq_printf(m, "CPU architecture: AArch64\n");
296 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
297 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
298 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
302 seq_printf(m, "Hardware\t: %s\n", machine_name);
307 static void *c_start(struct seq_file *m, loff_t *pos)
309 return *pos < 1 ? (void *)1 : NULL;
312 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
318 static void c_stop(struct seq_file *m, void *v)
322 const struct seq_operations cpuinfo_op = {