From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from terminus.zytor.com ([192.83.249.54]:39656 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754481AbXGJDlL (ORCPT ); Mon, 9 Jul 2007 23:41:11 -0400 From: "H. Peter Anvin" Subject: [x86 setup 24/33] MCA support for new x86 setup code Date: Mon, 9 Jul 2007 19:52:03 -0700 Message-Id: <1184038457733-git-send-email-hpa@zytor.com> In-Reply-To: <11840383522914-git-send-email-hpa@zytor.com> References: <11840359321823-git-send-email-hpa@zytor.com> <11840360383913-git-send-email-hpa@zytor.com> <11840361432207-git-send-email-hpa@zytor.com> <11840362483663-git-send-email-hpa@zytor.com> <11840363531039-git-send-email-hpa@zytor.com> <11840364593068-git-send-email-hpa@zytor.com> <1184036564610-git-send-email-hpa@zytor.com> <11840366692770-git-send-email-hpa@zytor.com> <11840367741994-git-send-email-hpa@zytor.com> <11840368791603-git-send-email-hpa@zytor.com> <11840369841576-git-send-email-hpa@zytor.com> <11840370903975-git-send-email-hpa@zytor.com> <11840371953778-git-send-email-hpa@zytor.com> <11840373002601-git-send-email-hpa@zytor.com> <11840374052662-git-send-email-hpa@zytor.com> <1184037510289-git-send-email-hpa@zytor.com> <11840376162370-git-send-email-hpa@zytor.com> <11840377211519-git-send-email-hpa@zytor.com> <11840378261081-git-send-email-hpa@zytor.com> <11840379311574-git-send-email-hpa@zytor.com> <11840380363720-git-send-email-hpa@zytor.com> <11840381413065-git-send-email-hpa@zytor.com> <11840382473923-git-send-email-hpa@zytor.com> <11840383522914-git-send-email-hpa@zytor.com> Message-Id: <77f7b2e92bb1de0f9d423b6537b8156296bcf931.1184032749.git.hpa@zytor.com> In-Reply-To: <2034f71d414def30de582fb59573295cadbdabb4.1184032748.git.hpa@zytor.com> References: <2034f71d414def30de582fb59573295cadbdabb4.1184032748.git.hpa@zytor.com> Sender: linux-arch-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, andi@firstfloor.org, akpm@linux-foundation.org Cc: "H. Peter Anvin" List-ID: From: H. Peter Anvin MCA probing support for the new x86 setup code. This implements the same functionality as the assembly version. Signed-off-by: H. Peter Anvin --- arch/i386/boot/mca.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 43 insertions(+), 0 deletions(-) create mode 100644 arch/i386/boot/mca.c diff --git a/arch/i386/boot/mca.c b/arch/i386/boot/mca.c new file mode 100644 index 0000000..9b68bd1 --- /dev/null +++ b/arch/i386/boot/mca.c @@ -0,0 +1,43 @@ +/* -*- 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; +} -- 1.5.2.2