From 9040ffca7702cd2668697de5e77b5bedeac50d7e Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 11 Jul 2007 12:18:49 -0700
Subject: [PATCH] --- yaml --- r: 58795 b: refs/heads/master c:
 3b53d3045bbb8ea3c9dce663b102eab0903817c5 h: refs/heads/master i:   58793:
 6785ba2f321527715e9e36b97d7d5e41fea28d99   58791:
 89f55a9e0a79c734c91665095e55afb605998c55 v: v3

---
 [refs]                     |  2 +-
 trunk/arch/i386/boot/mca.c | 43 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 trunk/arch/i386/boot/mca.c

diff --git a/[refs] b/[refs]
index 1238e03dcc8f..7ff5660036a3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d13444a5a53b0159e6316a7a7be9890143a5af71
+refs/heads/master: 3b53d3045bbb8ea3c9dce663b102eab0903817c5
diff --git a/trunk/arch/i386/boot/mca.c b/trunk/arch/i386/boot/mca.c
new file mode 100644
index 000000000000..9b68bd1aef19
--- /dev/null
+++ b/trunk/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;
+}