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/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>
58 unsigned int processor_id;
59 EXPORT_SYMBOL(processor_id);
61 unsigned long elf_hwcap __read_mostly;
62 EXPORT_SYMBOL_GPL(elf_hwcap);
65 #define COMPAT_ELF_HWCAP_DEFAULT \
66 (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
67 COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
68 COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
69 COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
70 COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
71 unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
74 static const char *cpu_name;
75 static const char *machine_name;
76 phys_addr_t __fdt_pointer __initdata;
79 * Standard memory resources
81 static struct resource mem_res[] = {
83 .name = "Kernel code",
86 .flags = IORESOURCE_MEM
89 .name = "Kernel data",
92 .flags = IORESOURCE_MEM
96 #define kernel_code mem_res[0]
97 #define kernel_data mem_res[1]
99 void __init early_print(const char *str, ...)
105 vsnprintf(buf, sizeof(buf), str, ap);
111 void __init smp_setup_processor_id(void)
114 * clear __my_cpu_offset on boot CPU to avoid hang caused by
115 * using percpu variable early, for example, lockdep will
116 * access percpu variable inside lock_release
118 set_my_cpu_offset(0);
121 bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
123 return phys_id == cpu_logical_map(cpu);
126 static void __init setup_processor(void)
128 struct cpu_info *cpu_info;
131 cpu_info = lookup_processor_type(read_cpuid_id());
133 printk("CPU configuration botched (ID %08x), unable to continue.\n",
138 cpu_name = cpu_info->cpu_name;
140 printk("CPU: %s [%08x] revision %d\n",
141 cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
143 sprintf(init_utsname()->machine, ELF_PLATFORM);
147 * ID_AA64ISAR0_EL1 contains 4-bit wide signed feature blocks.
148 * The blocks we test below represent incremental functionality
149 * for non-negative values. Negative values are reserved.
151 features = read_cpuid(ID_AA64ISAR0_EL1);
152 block = (features >> 4) & 0xf;
153 if (!(block & 0x8)) {
157 elf_hwcap |= HWCAP_PMULL;
159 elf_hwcap |= HWCAP_AES;
165 block = (features >> 8) & 0xf;
166 if (block && !(block & 0x8))
167 elf_hwcap |= HWCAP_SHA1;
169 block = (features >> 12) & 0xf;
170 if (block && !(block & 0x8))
171 elf_hwcap |= HWCAP_SHA2;
173 block = (features >> 16) & 0xf;
174 if (block && !(block & 0x8))
175 elf_hwcap |= HWCAP_CRC32;
178 static void __init setup_machine_fdt(phys_addr_t dt_phys)
180 if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
182 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
183 "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
184 "\nPlease check your bootloader.\n",
185 dt_phys, phys_to_virt(dt_phys));
191 machine_name = of_flat_dt_get_machine_name();
195 * Limit the memory size that was specified via FDT.
197 static int __init early_mem(char *p)
204 limit = memparse(p, &p) & PAGE_MASK;
205 pr_notice("Memory limited to %lldMB\n", limit >> 20);
207 memblock_enforce_memory_limit(limit);
211 early_param("mem", early_mem);
213 static void __init request_standard_resources(void)
215 struct memblock_region *region;
216 struct resource *res;
218 kernel_code.start = virt_to_phys(_text);
219 kernel_code.end = virt_to_phys(_etext - 1);
220 kernel_data.start = virt_to_phys(_sdata);
221 kernel_data.end = virt_to_phys(_end - 1);
223 for_each_memblock(memory, region) {
224 res = alloc_bootmem_low(sizeof(*res));
225 res->name = "System RAM";
226 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
227 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
228 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
230 request_resource(&iomem_resource, res);
232 if (kernel_code.start >= res->start &&
233 kernel_code.end <= res->end)
234 request_resource(res, &kernel_code);
235 if (kernel_data.start >= res->start &&
236 kernel_data.end <= res->end)
237 request_resource(res, &kernel_data);
241 u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
243 void __init setup_arch(char **cmdline_p)
246 * Unmask asynchronous aborts early to catch possible system errors.
248 local_async_enable();
252 setup_machine_fdt(__fdt_pointer);
254 init_mm.start_code = (unsigned long) _text;
255 init_mm.end_code = (unsigned long) _etext;
256 init_mm.end_data = (unsigned long) _edata;
257 init_mm.brk = (unsigned long) _end;
259 *cmdline_p = boot_command_line;
263 arm64_memblock_init();
266 request_standard_resources();
268 unflatten_device_tree();
272 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
273 cpu_read_bootcpu_ops();
279 #if defined(CONFIG_VGA_CONSOLE)
280 conswitchp = &vga_con;
281 #elif defined(CONFIG_DUMMY_CONSOLE)
282 conswitchp = &dummy_con;
287 static int __init arm64_device_init(void)
290 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
293 arch_initcall(arm64_device_init);
295 static DEFINE_PER_CPU(struct cpu, cpu_data);
297 static int __init topology_init(void)
301 for_each_possible_cpu(i) {
302 struct cpu *cpu = &per_cpu(cpu_data, i);
303 cpu->hotpluggable = 1;
304 register_cpu(cpu, i);
309 subsys_initcall(topology_init);
311 static const char *hwcap_str[] = {
323 static int c_show(struct seq_file *m, void *v)
327 seq_printf(m, "Processor\t: %s rev %d (%s)\n",
328 cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
330 for_each_online_cpu(i) {
332 * glibc reads /proc/cpuinfo to determine the number of
333 * online processors, looking for lines beginning with
334 * "processor". Give glibc what it expects.
337 seq_printf(m, "processor\t: %d\n", i);
341 /* dump out the processor features */
342 seq_puts(m, "Features\t: ");
344 for (i = 0; hwcap_str[i]; i++)
345 if (elf_hwcap & (1 << i))
346 seq_printf(m, "%s ", hwcap_str[i]);
348 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
349 seq_printf(m, "CPU architecture: AArch64\n");
350 seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
351 seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
352 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
356 seq_printf(m, "Hardware\t: %s\n", machine_name);
361 static void *c_start(struct seq_file *m, loff_t *pos)
363 return *pos < 1 ? (void *)1 : NULL;
366 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
372 static void c_stop(struct seq_file *m, void *v)
376 const struct seq_operations cpuinfo_op = {