soc/intel/common: Add IGD OpRegion support

Add helper function that fills OpRegion structure based on
VBT file content and some reasonable defaults.

Change-Id: I9aa8862878cc016a9a684c844ceab390734f3e84
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/14806
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/src/soc/intel/common/opregion.c b/src/soc/intel/common/opregion.c
new file mode 100644
index 0000000000..fa4d604a42
--- /dev/null
+++ b/src/soc/intel/common/opregion.c
@@ -0,0 +1,59 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <string.h>
+
+#include "gma.h"
+#include "opregion.h"
+#include "vbt.h"
+
+int init_igd_opregion(igd_opregion_t *opregion)
+{
+	struct region_device vbt_rdev;
+	optionrom_vbt_t *vbt;
+
+	if (locate_vbt(&vbt_rdev) == CB_ERR) {
+		printk(BIOS_ERR, "VBT not found\n");
+		return 0;
+	};
+
+	vbt = rdev_mmap_full(&vbt_rdev);
+
+	if (!vbt) {
+		printk(BIOS_ERR, "VBT couldn't be read\n");
+		return 0;
+	}
+
+	memset(opregion, 0, sizeof(igd_opregion_t));
+
+	memcpy(&opregion->header.signature, IGD_OPREGION_SIGNATURE,
+					sizeof(IGD_OPREGION_SIGNATURE));
+	memcpy(opregion->header.vbios_version, vbt->coreblock_biosbuild,
+					ARRAY_SIZE(vbt->coreblock_biosbuild));
+	memcpy(opregion->vbt.gvd1, vbt, MIN(vbt->hdr_vbt_size,
+					sizeof(opregion->vbt.gvd1)));
+
+	/* 8KiB */
+	opregion->header.size = sizeof(igd_opregion_t) / KiB;
+	opregion->header.version = IGD_OPREGION_VERSION;
+
+	/* FIXME We just assume we're mobile for now */
+	opregion->header.mailboxes = MAILBOXES_MOBILE;
+
+	rdev_munmap(&vbt_rdev, vbt);
+
+	return 1;
+}