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author | Catalin Marinas <catalin.marinas@arm.com> | 2012-03-05 11:49:27 (GMT) |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2012-09-17 09:24:45 (GMT) |
commit | 9703d9d7f77ce129621f7d80a844822e2daa7008 (patch) | |
tree | cd142aedfb18191266756bc6eaa3b1915c3755b5 /arch/arm64/kernel/setup.c | |
parent | 0be7320a635c2e434e8b67e0e9474a85ceb421c4 (diff) | |
download | linux-fsl-qoriq-9703d9d7f77ce129621f7d80a844822e2daa7008.tar.xz |
arm64: Kernel booting and initialisation
The patch adds the kernel booting and the initial setup code.
Documentation/arm64/booting.txt describes the booting protocol on the
AArch64 Linux kernel. This is subject to change following the work on
boot standardisation, ACPI.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm64/kernel/setup.c')
-rw-r--r-- | arch/arm64/kernel/setup.c | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c new file mode 100644 index 0000000..48ffb9f --- /dev/null +++ b/arch/arm64/kernel/setup.c @@ -0,0 +1,347 @@ +/* + * 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 <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> + +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) +{ + size &= PAGE_MASK; + 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(); + +#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 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 +}; |