44 lines
949 B
C
44 lines
949 B
C
|
/* -*- linux-c -*- ------------------------------------------------------- *
|
||
|
|
*
|
||
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
||
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
||
|
|
*
|
||
|
|
* This file is part of the Linux kernel, and is made available under
|
||
|
|
* the terms of the GNU General Public License version 2.
|
||
|
|
*
|
||
|
|
* ----------------------------------------------------------------------- */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* arch/i386/boot/mca.c
|
||
|
|
*
|
||
|
|
* Get the MCA system description table
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "boot.h"
|
||
|
|
|
||
|
|
int query_mca(void)
|
||
|
|
{
|
||
|
|
u8 err;
|
||
|
|
u16 es, bx, len;
|
||
|
|
|
||
|
|
asm("pushw %%es ; "
|
||
|
|
"int $0x15 ; "
|
||
|
|
"setc %0 ; "
|
||
|
|
"movw %%es, %1 ; "
|
||
|
|
"popw %%es"
|
||
|
|
: "=acdSDm" (err), "=acdSDm" (es), "=b" (bx)
|
||
|
|
: "a" (0xc000));
|
||
|
|
|
||
|
|
if (err)
|
||
|
|
return -1; /* No MCA present */
|
||
|
|
|
||
|
|
set_fs(es);
|
||
|
|
len = rdfs16(bx);
|
||
|
|
|
||
|
|
if (len > sizeof(boot_params.sys_desc_table))
|
||
|
|
len = sizeof(boot_params.sys_desc_table);
|
||
|
|
|
||
|
|
copy_from_fs(&boot_params.sys_desc_table, bx, len);
|
||
|
|
return 0;
|
||
|
|
}
|