blob: ec764b6cafbaabe1a2f62a2752859aebb2364a9a [file] [log] [blame]
/*
* linux/arch/x86_64/kernel/head64.c -- prepare to run common code
*
* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
*
* $Id: head64.c,v 1.27 2003/03/31 15:12:07 ak Exp $
*/
#include <asm/bootsetup.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <asm/processor.h>
#include <asm/proto.h>
static void __init clear_bss(void)
{
extern char __bss_start[], __bss_end[];
printk("Clearing %ld bytes of bss...", (unsigned long) __bss_end - (unsigned long) __bss_start);
memset(__bss_start, 0,
(unsigned long) __bss_end - (unsigned long) __bss_start);
printk("ok\n");
}
extern char x86_boot_params[2048];
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
#define OLD_CL_MAGIC_ADDR 0x90020
#define OLD_CL_MAGIC 0xA33F
#define OLD_CL_BASE_ADDR 0x90000
#define OLD_CL_OFFSET 0x90022
extern char saved_command_line[];
static void __init copy_bootdata(char *real_mode_data)
{
int new_data;
char * command_line;
memcpy(x86_boot_params, real_mode_data, 2048);
new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
if (!new_data) {
if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
printk("so old bootloader that it does not support commandline?!\n");
return;
}
new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
printk("old bootloader convention, maybe loadlin?\n");
}
command_line = (char *) ((u64)(new_data));
memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
printk("Bootdata ok (command line is %s)\n", saved_command_line);
}
static void __init setup_boot_cpu_data(void)
{
int dummy, eax;
/* get vendor info */
cpuid(0, &boot_cpu_data.cpuid_level,
(int *)&boot_cpu_data.x86_vendor_id[0],
(int *)&boot_cpu_data.x86_vendor_id[8],
(int *)&boot_cpu_data.x86_vendor_id[4]);
/* get cpu type */
cpuid(1, &eax, &dummy, &dummy, (int *) &boot_cpu_data.x86_capability);
boot_cpu_data.x86 = (eax >> 8) & 0xf;
boot_cpu_data.x86_model = (eax >> 4) & 0xf;
boot_cpu_data.x86_mask = eax & 0xf;
}
void __init x86_64_start_kernel(char * real_mode_data)
{
char *s;
clear_bss(); /* must be the first thing in C and must not depend on .bss to be zero */
pda_init(0);
copy_bootdata(real_mode_data);
s = strstr(saved_command_line, "earlyprintk=");
if (s != NULL)
setup_early_printk(s+12);
#ifdef CONFIG_DISCONTIGMEM
extern int numa_setup(char *);
s = strstr(saved_command_line, "numa=");
if (s != NULL)
numa_setup(s+5);
#endif
early_printk("booting x86_64 kernel... ");
setup_boot_cpu_data();
start_kernel();
}