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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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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 -*- ------------------------------------------------------- *
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright 2007 rPath, Inc. - All Rights Reserved
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* Copyright 2009 Intel Corporation; author H. Peter Anvin
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2.
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*
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* ----------------------------------------------------------------------- */
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/*
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* Get the MCA system description table
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*/
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#include "boot.h"
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int query_mca(void)
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{
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struct biosregs ireg, oreg;
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u16 len;
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initregs(&ireg);
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ireg.ah = 0xc0;
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intcall(0x15, &ireg, &oreg);
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if (oreg.eflags & X86_EFLAGS_CF)
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return -1; /* No MCA present */
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set_fs(oreg.es);
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len = rdfs16(oreg.bx);
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if (len > sizeof(boot_params.sys_desc_table))
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len = sizeof(boot_params.sys_desc_table);
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copy_from_fs(&boot_params.sys_desc_table, oreg.bx, len);
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return 0;
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}
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