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>
44 #include <linux/personality.h>
46 #include <asm/cputype.h>
48 #include <asm/cputable.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 int elf_hwcap __read_mostly
;
62 EXPORT_SYMBOL_GPL(elf_hwcap
);
64 static const char *cpu_name
;
65 static const char *machine_name
;
66 phys_addr_t __fdt_pointer __initdata
;
69 * Standard memory resources
71 static struct resource mem_res
[] = {
73 .name
= "Kernel code",
76 .flags
= IORESOURCE_MEM
79 .name
= "Kernel data",
82 .flags
= IORESOURCE_MEM
86 #define kernel_code mem_res[0]
87 #define kernel_data mem_res[1]
89 void __init
early_print(const char *str
, ...)
95 vsnprintf(buf
, sizeof(buf
), str
, ap
);
101 struct cpuinfo_arm64
{
106 static DEFINE_PER_CPU(struct cpuinfo_arm64
, cpu_data
);
108 void cpuinfo_store_cpu(void)
110 struct cpuinfo_arm64
*info
= this_cpu_ptr(&cpu_data
);
111 info
->reg_midr
= read_cpuid_id();
114 static void __init
setup_processor(void)
116 struct cpu_info
*cpu_info
;
119 * locate processor in the list of supported processor
120 * types. The linker builds this table for us from the
121 * entries in arch/arm/mm/proc.S
123 cpu_info
= lookup_processor_type(read_cpuid_id());
125 printk("CPU configuration botched (ID %08x), unable to continue.\n",
130 cpu_name
= cpu_info
->cpu_name
;
132 printk("CPU: %s [%08x] revision %d\n",
133 cpu_name
, read_cpuid_id(), read_cpuid_id() & 15);
135 sprintf(init_utsname()->machine
, "aarch64");
139 static void __init
setup_machine_fdt(phys_addr_t dt_phys
)
141 struct boot_param_header
*devtree
;
142 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
);
209 void * __init
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
211 return __va(memblock_alloc(size
, align
));
215 * Limit the memory size that was specified via FDT.
217 static int __init
early_mem(char *p
)
224 limit
= memparse(p
, &p
) & PAGE_MASK
;
225 pr_notice("Memory limited to %lldMB\n", limit
>> 20);
227 memblock_enforce_memory_limit(limit
);
231 early_param("mem", early_mem
);
233 static void __init
request_standard_resources(void)
235 struct memblock_region
*region
;
236 struct resource
*res
;
238 kernel_code
.start
= virt_to_phys(_text
);
239 kernel_code
.end
= virt_to_phys(_etext
- 1);
240 kernel_data
.start
= virt_to_phys(_sdata
);
241 kernel_data
.end
= virt_to_phys(_end
- 1);
243 for_each_memblock(memory
, region
) {
244 res
= alloc_bootmem_low(sizeof(*res
));
245 res
->name
= "System RAM";
246 res
->start
= __pfn_to_phys(memblock_region_memory_base_pfn(region
));
247 res
->end
= __pfn_to_phys(memblock_region_memory_end_pfn(region
)) - 1;
248 res
->flags
= IORESOURCE_MEM
| IORESOURCE_BUSY
;
250 request_resource(&iomem_resource
, res
);
252 if (kernel_code
.start
>= res
->start
&&
253 kernel_code
.end
<= res
->end
)
254 request_resource(res
, &kernel_code
);
255 if (kernel_data
.start
>= res
->start
&&
256 kernel_data
.end
<= res
->end
)
257 request_resource(res
, &kernel_data
);
261 u64 __cpu_logical_map
[NR_CPUS
] = { [0 ... NR_CPUS
-1] = INVALID_HWID
};
263 void __init
setup_arch(char **cmdline_p
)
267 setup_machine_fdt(__fdt_pointer
);
269 init_mm
.start_code
= (unsigned long) _text
;
270 init_mm
.end_code
= (unsigned long) _etext
;
271 init_mm
.end_data
= (unsigned long) _edata
;
272 init_mm
.brk
= (unsigned long) _end
;
274 *cmdline_p
= boot_command_line
;
278 arm64_memblock_init();
281 request_standard_resources();
283 unflatten_device_tree();
287 cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK
;
293 #if defined(CONFIG_VGA_CONSOLE)
294 conswitchp
= &vga_con
;
295 #elif defined(CONFIG_DUMMY_CONSOLE)
296 conswitchp
= &dummy_con
;
301 static int __init
arm64_device_init(void)
304 of_platform_populate(NULL
, of_default_bus_match_table
, NULL
, NULL
);
307 arch_initcall(arm64_device_init
);
309 static int __init
topology_init(void)
313 for_each_possible_cpu(i
) {
314 struct cpu
*cpu
= &per_cpu(cpu_data
.cpu
, i
);
315 cpu
->hotpluggable
= 1;
316 register_cpu(cpu
, i
);
321 subsys_initcall(topology_init
);
323 static const char *hwcap_str
[] = {
330 static const char *compat_hwcap_str
[] = {
354 #endif /* CONFIG_COMPAT */
356 static int c_show(struct seq_file
*m
, void *v
)
360 for_each_online_cpu(i
) {
361 struct cpuinfo_arm64
*cpuinfo
= &per_cpu(cpu_data
, i
);
362 u32 midr
= cpuinfo
->reg_midr
;
365 * glibc reads /proc/cpuinfo to determine the number of
366 * online processors, looking for lines beginning with
367 * "processor". Give glibc what it expects.
370 seq_printf(m
, "processor\t: %d\n", i
);
372 seq_printf(m
, "BogoMIPS\t: %lu.%02lu\n",
373 loops_per_jiffy
/ (500000UL/HZ
),
374 loops_per_jiffy
/ (5000UL/HZ
) % 100);
377 * Dump out the common processor features in a single line.
378 * Userspace should read the hwcaps with getauxval(AT_HWCAP)
379 * rather than attempting to parse this, but there's a body of
380 * software which does already (at least for 32-bit).
382 seq_puts(m
, "Features\t:");
383 if (personality(current
->personality
) == PER_LINUX32
) {
385 for (j
= 0; compat_hwcap_str
[j
]; j
++)
386 if (COMPAT_ELF_HWCAP
& (1 << j
))
387 seq_printf(m
, " %s", compat_hwcap_str
[j
]);
388 #endif /* CONFIG_COMPAT */
390 for (j
= 0; hwcap_str
[j
]; j
++)
391 if (elf_hwcap
& (1 << j
))
392 seq_printf(m
, " %s", hwcap_str
[j
]);
396 seq_printf(m
, "CPU implementer\t: 0x%02x\n", (midr
>> 24));
397 seq_printf(m
, "CPU architecture: 8\n");
398 seq_printf(m
, "CPU variant\t: 0x%x\n", ((midr
>> 20) & 0xf));
399 seq_printf(m
, "CPU part\t: 0x%03x\n", ((midr
>> 4) & 0xfff));
400 seq_printf(m
, "CPU revision\t: %d\n\n", (midr
& 0xf));
406 static void *c_start(struct seq_file
*m
, loff_t
*pos
)
408 return *pos
< 1 ? (void *)1 : NULL
;
411 static void *c_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
417 static void c_stop(struct seq_file
*m
, void *v
)
421 const struct seq_operations cpuinfo_op
= {