1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
/*
|
|
* 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 1.22 2001/07/06 14:28:20 ak Exp $
|
|
*/
|
|
|
|
#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>
|
|
|
|
/* Don't add a printk in there. printk relies on the PDA which is not initialized
|
|
yet. */
|
|
static void __init clear_bss(void)
|
|
{
|
|
extern char __bss_start[], __bss_end[];
|
|
memset(__bss_start, 0,
|
|
(unsigned long) __bss_end - (unsigned long) __bss_start);
|
|
}
|
|
|
|
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)
|
|
{
|
|
unsigned int dummy, eax;
|
|
|
|
/* get vendor info */
|
|
cpuid(0, (unsigned int *)&boot_cpu_data.cpuid_level,
|
|
(unsigned int *)&boot_cpu_data.x86_vendor_id[0],
|
|
(unsigned int *)&boot_cpu_data.x86_vendor_id[8],
|
|
(unsigned int *)&boot_cpu_data.x86_vendor_id[4]);
|
|
|
|
/* get cpu type */
|
|
cpuid(1, &eax, &dummy, &dummy,
|
|
(unsigned 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;
|
|
}
|
|
|
|
extern char _end[];
|
|
|
|
void __init x86_64_start_kernel(char * real_mode_data)
|
|
{
|
|
char *s;
|
|
int i;
|
|
|
|
for (i = 0; i < 256; i++)
|
|
set_intr_gate(i, early_idt_handler);
|
|
asm volatile("lidt %0" :: "m" (idt_descr));
|
|
clear_bss();
|
|
pda_init(0);
|
|
copy_bootdata(real_mode_data);
|
|
#ifdef CONFIG_SMP
|
|
cpu_set(0, cpu_online_map);
|
|
#endif
|
|
/* default console: */
|
|
if (!strstr(saved_command_line, "console="))
|
|
strcat(saved_command_line, " console=tty0");
|
|
s = strstr(saved_command_line, "earlyprintk=");
|
|
if (s != NULL)
|
|
setup_early_printk(s);
|
|
#ifdef CONFIG_DISCONTIGMEM
|
|
s = strstr(saved_command_line, "numa=");
|
|
if (s != NULL)
|
|
numa_setup(s+5);
|
|
#endif
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
if (strstr(saved_command_line, "disableapic"))
|
|
disable_apic = 1;
|
|
#endif
|
|
/* You need early console to see that */
|
|
if (__pa_symbol(&_end) >= KERNEL_TEXT_SIZE)
|
|
panic("Kernel too big for kernel mapping\n");
|
|
|
|
setup_boot_cpu_data();
|
|
start_kernel();
|
|
}
|