Initial IGD OpRegion implementation

Change-Id: I9e57c5792409830895a1147799acab95d910a336
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/1757
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/northbridge/intel/sandybridge/sandybridge.h b/src/northbridge/intel/sandybridge/sandybridge.h
index 03d146f..dd8681a 100644
--- a/src/northbridge/intel/sandybridge/sandybridge.h
+++ b/src/northbridge/intel/sandybridge/sandybridge.h
@@ -53,7 +53,7 @@
 #define DEFAULT_EPBAR		0xfed19000	/* 4 KB */
 #define DEFAULT_RCBABASE	0xfed1c000
 
-#include "../../../southbridge/intel/bd82x6x/pch.h"
+#include <southbridge/intel/bd82x6x/pch.h>
 
 /* Everything below this line is ignored in the DSDT */
 #ifndef __ACPI__
@@ -107,7 +107,8 @@
 /* Device 0:2.0 PCI configuration space (Graphics Device) */
 
 #define MSAC		0x62	/* Multi Size Aperture Control */
-
+#define SWSCI		0xe8	/* SWSCI  enable */
+#define ASLS		0xfc	/* OpRegion Base */
 
 /*
  * MCHBAR
@@ -233,6 +234,9 @@
 struct mrc_data_container *find_current_mrc_cache(void);
 #if !defined(__PRE_RAM__)
 void update_mrc_cache(void);
+
+#include "gma.h"
+int init_igd_opregion(igd_opregion_t *igd_opregion);
 #endif
 
 #endif