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/cpu.h>
36 #include <linux/interrupt.h>
37 #include <linux/smp.h>
39 #include <linux/proc_fs.h>
40 #include <linux/memblock.h>
41 #include <linux/of_fdt.h>
43 #include <asm/cputype.h>
45 #include <asm/cputable.h>
46 #include <asm/sections.h>
47 #include <asm/setup.h>
48 #include <asm/cacheflush.h>
49 #include <asm/tlbflush.h>
50 #include <asm/traps.h>
51 #include <asm/memblock.h>
53 unsigned int processor_id
;
54 EXPORT_SYMBOL(processor_id
);
56 unsigned int elf_hwcap __read_mostly
;
57 EXPORT_SYMBOL_GPL(elf_hwcap
);
59 static const char *cpu_name
;
60 static const char *machine_name
;
61 phys_addr_t __fdt_pointer __initdata
;
64 * Standard memory resources
66 static struct resource mem_res
[] = {
68 .name
= "Kernel code",
71 .flags
= IORESOURCE_MEM
74 .name
= "Kernel data",
77 .flags
= IORESOURCE_MEM
81 #define kernel_code mem_res[0]
82 #define kernel_data mem_res[1]
84 void __init
early_print(const char *str
, ...)
90 vsnprintf(buf
, sizeof(buf
), str
, ap
);
96 static void __init
setup_processor(void)
98 struct cpu_info
*cpu_info
;
101 * locate processor in the list of supported processor
102 * types. The linker builds this table for us from the
103 * entries in arch/arm/mm/proc.S
105 cpu_info
= lookup_processor_type(read_cpuid_id());
107 printk("CPU configuration botched (ID %08x), unable to continue.\n",
112 cpu_name
= cpu_info
->cpu_name
;
114 printk("CPU: %s [%08x] revision %d\n",
115 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15);
117 sprintf(init_utsname()->machine
, "aarch64");
121 static void __init
setup_machine_fdt(phys_addr_t dt_phys
)
123 struct boot_param_header
*devtree
;
124 unsigned long dt_root
;
126 /* Check we have a non-NULL DT pointer */
129 "Error: NULL or invalid device tree blob\n"
130 "The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
131 "\nPlease check your bootloader.\n");
138 devtree
= phys_to_virt(dt_phys
);
140 /* Check device tree validity */
141 if (be32_to_cpu(devtree
->magic
) != OF_DT_HEADER
) {
143 "Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
144 "Expected 0x%x, found 0x%x\n"
145 "\nPlease check your bootloader.\n",
146 dt_phys
, devtree
, OF_DT_HEADER
,
147 be32_to_cpu(devtree
->magic
));
153 initial_boot_params
= devtree
;
154 dt_root
= of_get_flat_dt_root();
156 machine_name
= of_get_flat_dt_prop(dt_root
, "model", NULL
);
158 machine_name
= of_get_flat_dt_prop(dt_root
, "compatible", NULL
);
160 machine_name
= "<unknown>";
161 pr_info("Machine: %s\n", machine_name
);
163 /* Retrieve various information from the /chosen node */
164 of_scan_flat_dt(early_init_dt_scan_chosen
, boot_command_line
);
165 /* Initialize {size,address}-cells info */
166 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
167 /* Setup memory, calling early_init_dt_add_memory_arch */
168 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
171 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
174 memblock_add(base
, size
);
177 void * __init
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
179 return __va(memblock_alloc(size
, align
));
183 * Limit the memory size that was specified via FDT.
185 static int __init
early_mem(char *p
)
192 limit
= memparse(p
, &p
) & PAGE_MASK
;
193 pr_notice("Memory limited to %lldMB\n", limit
>> 20);
195 memblock_enforce_memory_limit(limit
);
199 early_param("mem", early_mem
);
201 static void __init
request_standard_resources(void)
203 struct memblock_region
*region
;
204 struct resource
*res
;
206 kernel_code
.start
= virt_to_phys(_text
);
207 kernel_code
.end
= virt_to_phys(_etext
- 1);
208 kernel_data
.start
= virt_to_phys(_sdata
);
209 kernel_data
.end
= virt_to_phys(_end
- 1);
211 for_each_memblock(memory
, region
) {
212 res
= alloc_bootmem_low(sizeof(*res
));
213 res
->name
= "System RAM";
214 res
->start
= __pfn_to_phys(memblock_region_memory_base_pfn(region
));
215 res
->end
= __pfn_to_phys(memblock_region_memory_end_pfn(region
)) - 1;
216 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
218 request_resource(&iomem_resource
, res
);
220 if (kernel_code
.start
>= res
->start
&&
221 kernel_code
.end
<= res
->end
)
222 request_resource(res
, &kernel_code
);
223 if (kernel_data
.start
>= res
->start
&&
224 kernel_data
.end
<= res
->end
)
225 request_resource(res
, &kernel_data
);
229 void __init
setup_arch(char **cmdline_p
)
233 setup_machine_fdt(__fdt_pointer
);
235 init_mm
.start_code
= (unsigned long) _text
;
236 init_mm
.end_code
= (unsigned long) _etext
;
237 init_mm
.end_data
= (unsigned long) _edata
;
238 init_mm
.brk
= (unsigned long) _end
;
240 *cmdline_p
= boot_command_line
;
244 arm64_memblock_init();
247 request_standard_resources();
249 unflatten_device_tree();
256 #if defined(CONFIG_VGA_CONSOLE)
257 conswitchp
= &vga_con
;
258 #elif defined(CONFIG_DUMMY_CONSOLE)
259 conswitchp
= &dummy_con
;
264 static DEFINE_PER_CPU(struct cpu
, cpu_data
);
266 static int __init
topology_init(void)
270 for_each_possible_cpu(i
) {
271 struct cpu
*cpu
= &per_cpu(cpu_data
, i
);
272 cpu
->hotpluggable
= 1;
273 register_cpu(cpu
, i
);
278 subsys_initcall(topology_init
);
280 static const char *hwcap_str
[] = {
286 static int c_show(struct seq_file
*m
, void *v
)
290 seq_printf(m
, "Processor\t: %s rev %d (%s)\n",
291 cpu_name
, read_cpuid_id() & 15, ELF_PLATFORM
);
293 for_each_online_cpu(i
) {
295 * glibc reads /proc/cpuinfo to determine the number of
296 * online processors, looking for lines beginning with
297 * "processor". Give glibc what it expects.
300 seq_printf(m
, "processor\t: %d\n", i
);
302 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n\n",
303 loops_per_jiffy
/ (500000UL/HZ
),
304 loops_per_jiffy
/ (5000UL/HZ
) % 100);
307 /* dump out the processor features */
308 seq_puts(m
, "Features\t: ");
310 for (i
= 0; hwcap_str
[i
]; i
++)
311 if (elf_hwcap
& (1 << i
))
312 seq_printf(m
, "%s ", hwcap_str
[i
]);
314 seq_printf(m
, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
315 seq_printf(m
, "CPU architecture: AArch64\n");
316 seq_printf(m
, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
317 seq_printf(m
, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
318 seq_printf(m
, "CPU revision\t: %d\n", read_cpuid_id() & 15);
322 seq_printf(m
, "Hardware\t: %s\n", machine_name
);
327 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
329 return *pos
< 1 ? (void *)1 : NULL
;
332 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
338 static void c_stop(struct seq_file
*m
, void *v
)
342 const struct seq_operations cpuinfo_op
= {