From 6a2c09a386970257188824f8901706c5579d5b50 Mon Sep 17 00:00:00 2001
From: Jason Schildt <jschildt@gmail.com>
Date: Tue, 25 Oct 2005 21:07:34 +0000
Subject: [PATCH] - See Issue Tracker ID-3 "lnxi-patch3"

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2067 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/cpu/x86/mtrr/earlymtrr.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/cpu/x86/mtrr/earlymtrr.c b/src/cpu/x86/mtrr/earlymtrr.c
index 105f7c49df..aea8e258d4 100644
--- a/src/cpu/x86/mtrr/earlymtrr.c
+++ b/src/cpu/x86/mtrr/earlymtrr.c
@@ -117,4 +117,17 @@ static void early_mtrr_init(void)
 	enable_cache();
 }
 
+static int early_mtrr_init_detected(void)
+{
+	msr_t msr;
+	/* See if MTRR's are enabled.
+	 * a #RESET disables them while an #INIT
+	 * preserves their state.  This works
+	 * on both Intel and AMD cpus, at least
+	 * according to the documentation.
+	 */
+	msr = rdmsr(MTRRdefType_MSR);
+	return msr.lo & 0x00000800;
+}
+
 #endif /* EARLYMTRR_C */