From 68d6b0808bbd57a91abf2a5ac4571e4372a8d3fc Mon Sep 17 00:00:00 2001
From: aiju <devnull@localhost>
Date: Fri, 15 Apr 2011 20:29:46 +0200
Subject: added geode driver

---
 sys/src/cmd/aux/vga/io.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'sys/src/cmd/aux/vga/io.c')

diff --git a/sys/src/cmd/aux/vga/io.c b/sys/src/cmd/aux/vga/io.c
index c602c0837..ed73f6a27 100644
--- a/sys/src/cmd/aux/vga/io.c
+++ b/sys/src/cmd/aux/vga/io.c
@@ -11,6 +11,7 @@ static int iobfd = -1;
 static int iowfd = -1;
 static int iolfd = -1;
 static int biosfd = -1;
+static int msrfd = -1;
 static ulong biosoffset = 0;
 
 enum {
@@ -106,6 +107,29 @@ outportl(long port, ulong data)
 		error("outportl(0x%4.4lx, 0x%2.2luX): %r\n", port, data);
 }
 
+uvlong
+rdmsr(long port)
+{
+	uvlong data;
+
+	if(msrfd == -1)
+		msrfd = devopen("#P/msr", ORDWR);
+
+	if(pread(msrfd, &data, sizeof(data), port) != sizeof(data))
+		error("rdmsr(0x%4.4lx): %r\n", port);
+	return data;
+}
+
+void
+wrmsr(long port, uvlong data)
+{
+	if(msrfd == -1)
+		msrfd = devopen("#P/msr", ORDWR);
+
+	if(pwrite(msrfd, &data, sizeof(data), port) != sizeof(data))
+		error("wrmsr(0x%4.4lx, 0x%2.2lluX): %r\n", port, data);
+}
+
 static void
 vgactlinit(void)
 {
-- 
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