/* * 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(); }