371 lines
8.5 KiB
C
371 lines
8.5 KiB
C
/*
|
|
* Based on arch/arm/kernel/setup.c
|
|
*
|
|
* Copyright (C) 1995-2001 Russell King
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/console.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/screen_info.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/crash_dump.h>
|
|
#include <linux/root_dev.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_platform.h>
|
|
|
|
#include <asm/cputype.h>
|
|
#include <asm/elf.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/memblock.h>
|
|
#include <asm/psci.h>
|
|
|
|
unsigned int processor_id;
|
|
EXPORT_SYMBOL(processor_id);
|
|
|
|
unsigned int elf_hwcap __read_mostly;
|
|
EXPORT_SYMBOL_GPL(elf_hwcap);
|
|
|
|
static const char *cpu_name;
|
|
static const char *machine_name;
|
|
phys_addr_t __fdt_pointer __initdata;
|
|
|
|
/*
|
|
* Standard memory resources
|
|
*/
|
|
static struct resource mem_res[] = {
|
|
{
|
|
.name = "Kernel code",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_MEM
|
|
},
|
|
{
|
|
.name = "Kernel data",
|
|
.start = 0,
|
|
.end = 0,
|
|
.flags = IORESOURCE_MEM
|
|
}
|
|
};
|
|
|
|
#define kernel_code mem_res[0]
|
|
#define kernel_data mem_res[1]
|
|
|
|
void __init early_print(const char *str, ...)
|
|
{
|
|
char buf[256];
|
|
va_list ap;
|
|
|
|
va_start(ap, str);
|
|
vsnprintf(buf, sizeof(buf), str, ap);
|
|
va_end(ap);
|
|
|
|
printk("%s", buf);
|
|
}
|
|
|
|
static void __init setup_processor(void)
|
|
{
|
|
struct cpu_info *cpu_info;
|
|
|
|
/*
|
|
* locate processor in the list of supported processor
|
|
* types. The linker builds this table for us from the
|
|
* entries in arch/arm/mm/proc.S
|
|
*/
|
|
cpu_info = lookup_processor_type(read_cpuid_id());
|
|
if (!cpu_info) {
|
|
printk("CPU configuration botched (ID %08x), unable to continue.\n",
|
|
read_cpuid_id());
|
|
while (1);
|
|
}
|
|
|
|
cpu_name = cpu_info->cpu_name;
|
|
|
|
printk("CPU: %s [%08x] revision %d\n",
|
|
cpu_name, read_cpuid_id(), read_cpuid_id() & 15);
|
|
|
|
sprintf(init_utsname()->machine, "aarch64");
|
|
elf_hwcap = 0;
|
|
}
|
|
|
|
static void __init setup_machine_fdt(phys_addr_t dt_phys)
|
|
{
|
|
struct boot_param_header *devtree;
|
|
unsigned long dt_root;
|
|
|
|
/* Check we have a non-NULL DT pointer */
|
|
if (!dt_phys) {
|
|
early_print("\n"
|
|
"Error: NULL or invalid device tree blob\n"
|
|
"The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
|
|
"\nPlease check your bootloader.\n");
|
|
|
|
while (true)
|
|
cpu_relax();
|
|
|
|
}
|
|
|
|
devtree = phys_to_virt(dt_phys);
|
|
|
|
/* Check device tree validity */
|
|
if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) {
|
|
early_print("\n"
|
|
"Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
|
|
"Expected 0x%x, found 0x%x\n"
|
|
"\nPlease check your bootloader.\n",
|
|
dt_phys, devtree, OF_DT_HEADER,
|
|
be32_to_cpu(devtree->magic));
|
|
|
|
while (true)
|
|
cpu_relax();
|
|
}
|
|
|
|
initial_boot_params = devtree;
|
|
dt_root = of_get_flat_dt_root();
|
|
|
|
machine_name = of_get_flat_dt_prop(dt_root, "model", NULL);
|
|
if (!machine_name)
|
|
machine_name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
|
|
if (!machine_name)
|
|
machine_name = "<unknown>";
|
|
pr_info("Machine: %s\n", machine_name);
|
|
|
|
/* Retrieve various information from the /chosen node */
|
|
of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
|
|
/* Initialize {size,address}-cells info */
|
|
of_scan_flat_dt(early_init_dt_scan_root, NULL);
|
|
/* Setup memory, calling early_init_dt_add_memory_arch */
|
|
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
|
|
}
|
|
|
|
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
base &= PAGE_MASK;
|
|
size &= PAGE_MASK;
|
|
if (base + size < PHYS_OFFSET) {
|
|
pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
if (base < PHYS_OFFSET) {
|
|
pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
|
|
base, PHYS_OFFSET);
|
|
size -= PHYS_OFFSET - base;
|
|
base = PHYS_OFFSET;
|
|
}
|
|
memblock_add(base, size);
|
|
}
|
|
|
|
void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return __va(memblock_alloc(size, align));
|
|
}
|
|
|
|
/*
|
|
* Limit the memory size that was specified via FDT.
|
|
*/
|
|
static int __init early_mem(char *p)
|
|
{
|
|
phys_addr_t limit;
|
|
|
|
if (!p)
|
|
return 1;
|
|
|
|
limit = memparse(p, &p) & PAGE_MASK;
|
|
pr_notice("Memory limited to %lldMB\n", limit >> 20);
|
|
|
|
memblock_enforce_memory_limit(limit);
|
|
|
|
return 0;
|
|
}
|
|
early_param("mem", early_mem);
|
|
|
|
static void __init request_standard_resources(void)
|
|
{
|
|
struct memblock_region *region;
|
|
struct resource *res;
|
|
|
|
kernel_code.start = virt_to_phys(_text);
|
|
kernel_code.end = virt_to_phys(_etext - 1);
|
|
kernel_data.start = virt_to_phys(_sdata);
|
|
kernel_data.end = virt_to_phys(_end - 1);
|
|
|
|
for_each_memblock(memory, region) {
|
|
res = alloc_bootmem_low(sizeof(*res));
|
|
res->name = "System RAM";
|
|
res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
|
|
res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
|
|
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
|
|
request_resource(&iomem_resource, res);
|
|
|
|
if (kernel_code.start >= res->start &&
|
|
kernel_code.end <= res->end)
|
|
request_resource(res, &kernel_code);
|
|
if (kernel_data.start >= res->start &&
|
|
kernel_data.end <= res->end)
|
|
request_resource(res, &kernel_data);
|
|
}
|
|
}
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
setup_processor();
|
|
|
|
setup_machine_fdt(__fdt_pointer);
|
|
|
|
init_mm.start_code = (unsigned long) _text;
|
|
init_mm.end_code = (unsigned long) _etext;
|
|
init_mm.end_data = (unsigned long) _edata;
|
|
init_mm.brk = (unsigned long) _end;
|
|
|
|
*cmdline_p = boot_command_line;
|
|
|
|
parse_early_param();
|
|
|
|
arm64_memblock_init();
|
|
|
|
paging_init();
|
|
request_standard_resources();
|
|
|
|
unflatten_device_tree();
|
|
|
|
psci_init();
|
|
|
|
#ifdef CONFIG_SMP
|
|
smp_init_cpus();
|
|
#endif
|
|
|
|
#ifdef CONFIG_VT
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
conswitchp = &vga_con;
|
|
#elif defined(CONFIG_DUMMY_CONSOLE)
|
|
conswitchp = &dummy_con;
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
static DEFINE_PER_CPU(struct cpu, cpu_data);
|
|
|
|
static int __init topology_init(void)
|
|
{
|
|
int i;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct cpu *cpu = &per_cpu(cpu_data, i);
|
|
cpu->hotpluggable = 1;
|
|
register_cpu(cpu, i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(topology_init);
|
|
|
|
static int __init arm64_device_probe(void)
|
|
{
|
|
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
|
|
return 0;
|
|
}
|
|
device_initcall(arm64_device_probe);
|
|
|
|
static const char *hwcap_str[] = {
|
|
"fp",
|
|
"asimd",
|
|
NULL
|
|
};
|
|
|
|
static int c_show(struct seq_file *m, void *v)
|
|
{
|
|
int i;
|
|
|
|
seq_printf(m, "Processor\t: %s rev %d (%s)\n",
|
|
cpu_name, read_cpuid_id() & 15, ELF_PLATFORM);
|
|
|
|
for_each_online_cpu(i) {
|
|
/*
|
|
* glibc reads /proc/cpuinfo to determine the number of
|
|
* online processors, looking for lines beginning with
|
|
* "processor". Give glibc what it expects.
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
seq_printf(m, "processor\t: %d\n", i);
|
|
#endif
|
|
seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
|
|
loops_per_jiffy / (500000UL/HZ),
|
|
loops_per_jiffy / (5000UL/HZ) % 100);
|
|
}
|
|
|
|
/* dump out the processor features */
|
|
seq_puts(m, "Features\t: ");
|
|
|
|
for (i = 0; hwcap_str[i]; i++)
|
|
if (elf_hwcap & (1 << i))
|
|
seq_printf(m, "%s ", hwcap_str[i]);
|
|
|
|
seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
|
|
seq_printf(m, "CPU architecture: AArch64\n");
|
|
seq_printf(m, "CPU variant\t: 0x%x\n", (read_cpuid_id() >> 20) & 15);
|
|
seq_printf(m, "CPU part\t: 0x%03x\n", (read_cpuid_id() >> 4) & 0xfff);
|
|
seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
|
|
|
|
seq_puts(m, "\n");
|
|
|
|
seq_printf(m, "Hardware\t: %s\n", machine_name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *c_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
return *pos < 1 ? (void *)1 : NULL;
|
|
}
|
|
|
|
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return NULL;
|
|
}
|
|
|
|
static void c_stop(struct seq_file *m, void *v)
|
|
{
|
|
}
|
|
|
|
const struct seq_operations cpuinfo_op = {
|
|
.start = c_start,
|
|
.next = c_next,
|
|
.stop = c_stop,
|
|
.show = c_show
|
|
};
|