1 files changed, 93 insertions, 0 deletions
diff --git a/src/vendorcode/google/chromeos/verstub.c b/src/vendorcode/google/chromeos/verstub.c
new file mode 100644
index 0000000000..5df1777bb2
--- /dev/null
+++ b/src/vendorcode/google/chromeos/verstub.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/stages.h>
+#include <cbfs.h>
+#include <console/console.h>
+#include <string.h>
+#include "chromeos.h"
+
+static struct vb2_working_data *init_vb2_working_data(void)
+{
+	struct vb2_working_data *wd;
+
+	wd = vboot_get_working_data();
+	memset(wd, 0, CONFIG_VBOOT_WORK_BUFFER_SIZE);
+	/* 8-byte alignment for ARMv7 */
+	wd->buffer = (uint8_t *)ALIGN_UP((uintptr_t)&wd[1], 8);
+	wd->buffer_size = CONFIG_VBOOT_WORK_BUFFER_SIZE + (uintptr_t)wd
+			- (uintptr_t)wd->buffer;
+
+	return wd;
+}
+
+/**
+ * Verify a slot and jump to the next stage
+ *
+ * This could be either part of the (1) bootblock or the (2) verstage, depending
+ * on CONFIG_RETURN_FROM_VERSTAGE.
+ *
+ * 1) It jumps to the verstage and comes back, then, loads the romstage over the
+ * verstage space and exits to it. (note the cbfs cache is trashed on return
+ * from the verstage.)
+ *
+ * 2) We're already in the verstage. Verify firmware, then load the romstage and
+ * exits to it.
+ */
+void vboot2_verify_firmware(void)
+{
+	void *entry;
+	struct vb2_working_data *wd;
+
+	wd = init_vb2_working_data();
+
+#if CONFIG_RETURN_FROM_VERSTAGE
+	/* load verstage from RO */
+	entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
+				CONFIG_CBFS_PREFIX "/verstage");
+	if (entry == -1)
+		die("failed to load verstage");
+
+	/* verify and select a slot */
+	stage_exit(entry);
+#else
+	verstage_main();
+#endif /* CONFIG_RETURN_FROM_VERSTAGE */
+
+	/* jump to the selected slot */
+	entry = NULL;
+	if (vboot_is_slot_selected(wd)) {
+		/* RW A or B */
+		struct vboot_components *fw_info =
+				vboot_locate_components(&wd->selected_region);
+		if (fw_info == NULL)
+			die("failed to locate firmware components\n");
+		entry = vboot_load_stage(CONFIG_VBOOT_ROMSTAGE_INDEX,
+					 &wd->selected_region, fw_info);
+	} else if (vboot_is_readonly_path(wd)) {
+		/* RO */
+		entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA,
+					CONFIG_CBFS_PREFIX "/romstage");
+	}
+
+	if (entry != NULL && entry != (void *)-1)
+		stage_exit(entry);
+
+	die("failed to exit from stage\n");
+}