| 1 |
1275 |
phoenix |
/*
|
| 2 |
|
|
* linux/arch/x86_64/kernel/head64.c -- prepare to run common code
|
| 3 |
|
|
*
|
| 4 |
|
|
* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
|
| 5 |
|
|
*
|
| 6 |
|
|
* $Id: head64.c,v 1.1.1.1 2004-04-15 01:37:00 phoenix Exp $
|
| 7 |
|
|
*/
|
| 8 |
|
|
|
| 9 |
|
|
#include <asm/bootsetup.h>
|
| 10 |
|
|
#include <linux/init.h>
|
| 11 |
|
|
#include <linux/linkage.h>
|
| 12 |
|
|
#include <linux/types.h>
|
| 13 |
|
|
#include <linux/kernel.h>
|
| 14 |
|
|
#include <linux/string.h>
|
| 15 |
|
|
|
| 16 |
|
|
#include <asm/processor.h>
|
| 17 |
|
|
#include <asm/proto.h>
|
| 18 |
|
|
|
| 19 |
|
|
static void __init clear_bss(void)
|
| 20 |
|
|
{
|
| 21 |
|
|
extern char __bss_start[], __bss_end[];
|
| 22 |
|
|
printk("Clearing %ld bytes of bss...", (unsigned long) __bss_end - (unsigned long) __bss_start);
|
| 23 |
|
|
memset(__bss_start, 0,
|
| 24 |
|
|
(unsigned long) __bss_end - (unsigned long) __bss_start);
|
| 25 |
|
|
printk("ok\n");
|
| 26 |
|
|
}
|
| 27 |
|
|
|
| 28 |
|
|
extern char x86_boot_params[2048];
|
| 29 |
|
|
|
| 30 |
|
|
#define NEW_CL_POINTER 0x228 /* Relative to real mode data */
|
| 31 |
|
|
#define OLD_CL_MAGIC_ADDR 0x90020
|
| 32 |
|
|
#define OLD_CL_MAGIC 0xA33F
|
| 33 |
|
|
#define OLD_CL_BASE_ADDR 0x90000
|
| 34 |
|
|
#define OLD_CL_OFFSET 0x90022
|
| 35 |
|
|
|
| 36 |
|
|
extern char saved_command_line[];
|
| 37 |
|
|
|
| 38 |
|
|
static void __init copy_bootdata(char *real_mode_data)
|
| 39 |
|
|
{
|
| 40 |
|
|
int new_data;
|
| 41 |
|
|
char * command_line;
|
| 42 |
|
|
|
| 43 |
|
|
memcpy(x86_boot_params, real_mode_data, 2048);
|
| 44 |
|
|
new_data = *(int *) (x86_boot_params + NEW_CL_POINTER);
|
| 45 |
|
|
if (!new_data) {
|
| 46 |
|
|
if (OLD_CL_MAGIC != * (u16 *) OLD_CL_MAGIC_ADDR) {
|
| 47 |
|
|
printk("so old bootloader that it does not support commandline?!\n");
|
| 48 |
|
|
return;
|
| 49 |
|
|
}
|
| 50 |
|
|
new_data = OLD_CL_BASE_ADDR + * (u16 *) OLD_CL_OFFSET;
|
| 51 |
|
|
printk("old bootloader convention, maybe loadlin?\n");
|
| 52 |
|
|
}
|
| 53 |
|
|
command_line = (char *) ((u64)(new_data));
|
| 54 |
|
|
memcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
|
| 55 |
|
|
printk("Bootdata ok (command line is %s)\n", saved_command_line);
|
| 56 |
|
|
}
|
| 57 |
|
|
|
| 58 |
|
|
static void __init setup_boot_cpu_data(void)
|
| 59 |
|
|
{
|
| 60 |
|
|
int dummy, eax;
|
| 61 |
|
|
|
| 62 |
|
|
/* get vendor info */
|
| 63 |
|
|
cpuid(0, &boot_cpu_data.cpuid_level,
|
| 64 |
|
|
(int *)&boot_cpu_data.x86_vendor_id[0],
|
| 65 |
|
|
(int *)&boot_cpu_data.x86_vendor_id[8],
|
| 66 |
|
|
(int *)&boot_cpu_data.x86_vendor_id[4]);
|
| 67 |
|
|
|
| 68 |
|
|
/* get cpu type */
|
| 69 |
|
|
cpuid(1, &eax, &dummy, &dummy, (int *) &boot_cpu_data.x86_capability);
|
| 70 |
|
|
boot_cpu_data.x86 = (eax >> 8) & 0xf;
|
| 71 |
|
|
boot_cpu_data.x86_model = (eax >> 4) & 0xf;
|
| 72 |
|
|
boot_cpu_data.x86_mask = eax & 0xf;
|
| 73 |
|
|
}
|
| 74 |
|
|
|
| 75 |
|
|
void __init x86_64_start_kernel(char * real_mode_data)
|
| 76 |
|
|
{
|
| 77 |
|
|
char *s;
|
| 78 |
|
|
|
| 79 |
|
|
clear_bss(); /* must be the first thing in C and must not depend on .bss to be zero */
|
| 80 |
|
|
pda_init(0);
|
| 81 |
|
|
copy_bootdata(real_mode_data);
|
| 82 |
|
|
s = strstr(saved_command_line, "earlyprintk=");
|
| 83 |
|
|
if (s != NULL)
|
| 84 |
|
|
setup_early_printk(s+12);
|
| 85 |
|
|
#ifdef CONFIG_DISCONTIGMEM
|
| 86 |
|
|
extern int numa_setup(char *);
|
| 87 |
|
|
s = strstr(saved_command_line, "numa=");
|
| 88 |
|
|
if (s != NULL)
|
| 89 |
|
|
numa_setup(s+5);
|
| 90 |
|
|
#endif
|
| 91 |
|
|
early_printk("booting x86_64 kernel... ");
|
| 92 |
|
|
setup_boot_cpu_data();
|
| 93 |
|
|
start_kernel();
|
| 94 |
|
|
}
|
