original development tree for Linux kernel GTP module; now long in mainline.
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/*
* 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/clk-provider.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/smp_plat.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 long 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);
}
/*
* 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);
}
}
u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
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();
cpu_logical_map(0) = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
#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 int __init arm64_device_init(void)
{
of_clk_init(NULL);
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
return 0;
}
arch_initcall(arm64_device_init);
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 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
}
/* 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
};