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 bool arch_match_cpu_phys_id(int cpu
, u64 phys_id
)
113 return phys_id
== cpu_logical_map(cpu
);
116 static void __init
setup_processor(void)
118 struct cpu_info
*cpu_info
;
121 * locate processor in the list of supported processor
122 * types. The linker builds this table for us from the
123 * entries in arch/arm/mm/proc.S
125 cpu_info
= lookup_processor_type(read_cpuid_id());
127 printk("CPU configuration botched (ID %08x), unable to continue.\n",
132 cpu_name
= cpu_info
->cpu_name
;
134 printk("CPU: %s [%08x] revision %d\n",
135 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15);
137 sprintf(init_utsname()->machine
, ELF_PLATFORM
);
141 static void __init
setup_machine_fdt(phys_addr_t dt_phys
)
143 struct boot_param_header
*devtree
;
144 unsigned long dt_root
;
146 /* Check we have a non-NULL DT pointer */
149 "Error: NULL or invalid device tree blob\n"
150 "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
151 "\nPlease check your bootloader.\n");
158 devtree
= phys_to_virt(dt_phys
);
160 /* Check device tree validity */
161 if (be32_to_cpu(devtree
->magic
) != OF_DT_HEADER
) {
163 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
164 "Expected 0x%x, found 0x%x\n"
165 "\nPlease check your bootloader.\n",
166 dt_phys
, devtree
, OF_DT_HEADER
,
167 be32_to_cpu(devtree
->magic
));
173 initial_boot_params
= devtree
;
174 dt_root
= of_get_flat_dt_root();
176 machine_name
= of_get_flat_dt_prop(dt_root
, "model", NULL
);
178 machine_name
= of_get_flat_dt_prop(dt_root
, "compatible", NULL
);
180 machine_name
= "<unknown>";
181 pr_info("Machine: %s\n", machine_name
);
183 /* Retrieve various information from the /chosen node */
184 of_scan_flat_dt(early_init_dt_scan_chosen
, boot_command_line
);
185 /* Initialize {size,address}-cells info */
186 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
187 /* Setup memory, calling early_init_dt_add_memory_arch */
188 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
191 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
195 if (base
+ size
< PHYS_OFFSET
) {
196 pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
200 if (base
< PHYS_OFFSET
) {
201 pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
203 size
-= PHYS_OFFSET
- base
;
206 memblock_add(base
, size
);
210 * Limit the memory size that was specified via FDT.
212 static int __init
early_mem(char *p
)
219 limit
= memparse(p
, &p
) & PAGE_MASK
;
220 pr_notice("Memory limited to %lldMB\n", limit
>> 20);
222 memblock_enforce_memory_limit(limit
);
226 early_param("mem", early_mem
);
228 static void __init
request_standard_resources(void)
230 struct memblock_region
*region
;
231 struct resource
*res
;
233 kernel_code
.start
= virt_to_phys(_text
);
234 kernel_code
.end
= virt_to_phys(_etext
- 1);
235 kernel_data
.start
= virt_to_phys(_sdata
);
236 kernel_data
.end
= virt_to_phys(_end
- 1);
238 for_each_memblock(memory
, region
) {
239 res
= alloc_bootmem_low(sizeof(*res
));
240 res
->name
= "System RAM";
241 res
->start
= __pfn_to_phys(memblock_region_memory_base_pfn(region
));
242 res
->end
= __pfn_to_phys(memblock_region_memory_end_pfn(region
)) - 1;
243 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
245 request_resource(&iomem_resource
, res
);
247 if (kernel_code
.start
>= res
->start
&&
248 kernel_code
.end
<= res
->end
)
249 request_resource(res
, &kernel_code
);
250 if (kernel_data
.start
>= res
->start
&&
251 kernel_data
.end
<= res
->end
)
252 request_resource(res
, &kernel_data
);
256 u64 __cpu_logical_map
[NR_CPUS
] = { [0 ... NR_CPUS
-1] = INVALID_HWID
};
258 void __init
setup_arch(char **cmdline_p
)
262 setup_machine_fdt(__fdt_pointer
);
264 init_mm
.start_code
= (unsigned long) _text
;
265 init_mm
.end_code
= (unsigned long) _etext
;
266 init_mm
.end_data
= (unsigned long) _edata
;
267 init_mm
.brk
= (unsigned long) _end
;
269 *cmdline_p
= boot_command_line
;
273 arm64_memblock_init();
276 request_standard_resources();
278 unflatten_device_tree();
282 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK
;
283 cpu_read_bootcpu_ops();
289 #if defined(CONFIG_VGA_CONSOLE)
290 conswitchp
= &vga_con
;
291 #elif defined(CONFIG_DUMMY_CONSOLE)
292 conswitchp
= &dummy_con
;
297 static int __init
arm64_device_init(void)
300 of_platform_populate(NULL
, of_default_bus_match_table
, NULL
, NULL
);
303 arch_initcall(arm64_device_init
);
305 static DEFINE_PER_CPU(struct cpu
, cpu_data
);
307 static int __init
topology_init(void)
311 for_each_possible_cpu(i
) {
312 struct cpu
*cpu
= &per_cpu(cpu_data
, i
);
313 cpu
->hotpluggable
= 1;
314 register_cpu(cpu
, i
);
319 subsys_initcall(topology_init
);
321 static const char *hwcap_str
[] = {
328 static int c_show(struct seq_file
*m
, void *v
)
332 seq_printf(m
, "Processor\t: %s rev %d (%s)\n",
333 cpu_name
, read_cpuid_id() & 15, ELF_PLATFORM
);
335 for_each_online_cpu(i
) {
337 * glibc reads /proc/cpuinfo to determine the number of
338 * online processors, looking for lines beginning with
339 * "processor". Give glibc what it expects.
342 seq_printf(m
, "processor\t: %d\n", i
);
346 /* dump out the processor features */
347 seq_puts(m
, "Features\t: ");
349 for (i
= 0; hwcap_str
[i
]; i
++)
350 if (elf_hwcap
& (1 << i
))
351 seq_printf(m
, "%s ", hwcap_str
[i
]);
353 seq_printf(m
, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
354 seq_printf(m
, "CPU architecture: AArch64\n");
355 seq_printf(m
, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
356 seq_printf(m
, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
357 seq_printf(m
, "CPU revision\t: %d\n", read_cpuid_id() & 15);
361 seq_printf(m
, "Hardware\t: %s\n", machine_name
);
366 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
368 return *pos
< 1 ? (void *)1 : NULL
;
371 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
377 static void c_stop(struct seq_file
*m
, void *v
)
381 const struct seq_operations cpuinfo_op
= {