0a706db320
Impact: BIOS proofing "Glove box" off BIOS interrupts in the MCA code. LKML-Reference: <49DE7F79.4030106@zytor.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
39 lines
927 B
C
39 lines
927 B
C
/* -*- linux-c -*- ------------------------------------------------------- *
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
* Copyright 2007 rPath, Inc. - All Rights Reserved
|
|
* Copyright 2009 Intel Corporation; author H. Peter Anvin
|
|
*
|
|
* This file is part of the Linux kernel, and is made available under
|
|
* the terms of the GNU General Public License version 2.
|
|
*
|
|
* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Get the MCA system description table
|
|
*/
|
|
|
|
#include "boot.h"
|
|
|
|
int query_mca(void)
|
|
{
|
|
struct biosregs ireg, oreg;
|
|
u16 len;
|
|
|
|
initregs(&ireg);
|
|
ireg.ah = 0xc0;
|
|
intcall(0x15, &ireg, &oreg);
|
|
|
|
if (oreg.eflags & X86_EFLAGS_CF)
|
|
return -1; /* No MCA present */
|
|
|
|
set_fs(oreg.es);
|
|
len = rdfs16(oreg.bx);
|
|
|
|
if (len > sizeof(boot_params.sys_desc_table))
|
|
len = sizeof(boot_params.sys_desc_table);
|
|
|
|
copy_from_fs(&boot_params.sys_desc_table, oreg.bx, len);
|
|
return 0;
|
|
}
|