| /* |
| * 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 <linux/start_kernel.h> |
| |
| #include <asm/processor.h> |
| #include <asm/proto.h> |
| #include <asm/smp.h> |
| #include <asm/setup.h> |
| #include <asm/desc.h> |
| #include <asm/pgtable.h> |
| #include <asm/tlbflush.h> |
| #include <asm/sections.h> |
| #include <asm/kdebug.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); |
| } |
| |
| static void __init copy_bootdata(char *real_mode_data) |
| { |
| char * command_line; |
| |
| memcpy(&boot_params, real_mode_data, sizeof boot_params); |
| if (boot_params.hdr.cmd_line_ptr) { |
| command_line = __va(boot_params.hdr.cmd_line_ptr); |
| 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); |
| load_idt((const struct desc_ptr *)&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)); |
| |
| start_kernel(); |
| } |