linux-kernel - [x86 setup 24/33] MCA support for new x86 setup code

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Message-Id: <16466ebe45a5054920bf2e67083663eccf8da662.1184181208.git.hpa@zytor.com>
Date:	Wed, 11 Jul 2007 12:18:49 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	torvalds@...ux-foundation.org, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Cc:	"H. Peter Anvin" <hpa@...or.com>
Subject: [x86 setup 24/33] MCA support for new x86 setup code

From: H. Peter Anvin <hpa@...or.com>

MCA probing support for the new x86 setup code.  This implements the
same functionality as the assembly version.

Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 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

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