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author | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 09:17:24 (GMT) |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2007-10-11 09:17:24 (GMT) |
commit | 250c22777fe1ccd7ac588579a6c16db4c0161cc5 (patch) | |
tree | 55c317efb7d792ec6fdae1d1937c67a502c48dec /arch/x86/kernel/head64.c | |
parent | 2db55d344e529492545cb3b755c7e9ba8e4fa94e (diff) | |
download | linux-fsl-qoriq-250c22777fe1ccd7ac588579a6c16db4c0161cc5.tar.xz |
x86_64: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/head64.c')
-rw-r--r-- | arch/x86/kernel/head64.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c new file mode 100644 index 0000000..6c34bdd --- /dev/null +++ b/arch/x86/kernel/head64.c @@ -0,0 +1,86 @@ +/* + * linux/arch/x86_64/kernel/head64.c -- prepare to run common code + * + * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE + */ + +#include <linux/init.h> +#include <linux/linkage.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/percpu.h> + +#include <asm/processor.h> +#include <asm/proto.h> +#include <asm/smp.h> +#include <asm/bootsetup.h> +#include <asm/setup.h> +#include <asm/desc.h> +#include <asm/pgtable.h> +#include <asm/tlbflush.h> +#include <asm/sections.h> + +static void __init zap_identity_mappings(void) +{ + pgd_t *pgd = pgd_offset_k(0UL); + pgd_clear(pgd); + __flush_tlb(); +} + +/* Don't add a printk in there. printk relies on the PDA which is not initialized + yet. */ +static void __init clear_bss(void) +{ + memset(__bss_start, 0, + (unsigned long) __bss_stop - (unsigned long) __bss_start); +} + +#define NEW_CL_POINTER 0x228 /* Relative to real mode data */ +#define OLD_CL_MAGIC_ADDR 0x20 +#define OLD_CL_MAGIC 0xA33F +#define OLD_CL_OFFSET 0x22 + +static void __init copy_bootdata(char *real_mode_data) +{ + unsigned long new_data; + char * command_line; + + memcpy(x86_boot_params, real_mode_data, BOOT_PARAM_SIZE); + new_data = *(u32 *) (x86_boot_params + NEW_CL_POINTER); + if (!new_data) { + if (OLD_CL_MAGIC != *(u16 *)(real_mode_data + OLD_CL_MAGIC_ADDR)) { + return; + } + new_data = __pa(real_mode_data) + *(u16 *)(real_mode_data + OLD_CL_OFFSET); + } + command_line = __va(new_data); + memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); +} + +void __init x86_64_start_kernel(char * real_mode_data) +{ + int i; + + /* clear bss before set_intr_gate with early_idt_handler */ + clear_bss(); + + /* Make NULL pointers segfault */ + zap_identity_mappings(); + + for (i = 0; i < IDT_ENTRIES; i++) + set_intr_gate(i, early_idt_handler); + asm volatile("lidt %0" :: "m" (idt_descr)); + + early_printk("Kernel alive\n"); + + for (i = 0; i < NR_CPUS; i++) + cpu_pda(i) = &boot_cpu_pda[i]; + + pda_init(0); + copy_bootdata(__va(real_mode_data)); +#ifdef CONFIG_SMP + cpu_set(0, cpu_online_map); +#endif + start_kernel(); +} |