vboot: Separate vboot from chromeos

VBOOT_VERIFY_FIRMWARE should be independent of CHROMEOS. This allows use
of verified boot library without having to stick to CHROMEOS.

BUG=chrome-os-partner:55639

Change-Id: Ia2c328712caedd230ab295b8a613e3c1ed1532d9
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/15867
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

1 files changed, 79 insertions, 0 deletions

diff --git a/src/vboot/vbnv_cmos.c b/src/vboot/vbnv_cmos.c
new file mode 100644
index 0000000000..5eda8e6e50
--- /dev/null
+++ b/src/vboot/vbnv_cmos.c
@@ -0,0 +1,79 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ *
+ * 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 <bootstate.h>
+#include <console/console.h>
+#include <types.h>
+#include <pc80/mc146818rtc.h>
+#include <vboot/vbnv.h>
+#include <vboot/vbnv_layout.h>
+
+void read_vbnv_cmos(uint8_t *vbnv_copy)
+{
+	int i;
+
+	for (i = 0; i < VBOOT_VBNV_BLOCK_SIZE; i++)
+		vbnv_copy[i] = cmos_read(CONFIG_VBOOT_VBNV_OFFSET + 14 + i);
+
+	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS_BACKUP_TO_FLASH)) {
+		if (verify_vbnv(vbnv_copy))
+			return;
+
+		printk(BIOS_INFO, "VBNV: CMOS invalid, restoring from flash\n");
+		read_vbnv_flash(vbnv_copy);
+
+		if (verify_vbnv(vbnv_copy)) {
+			save_vbnv_cmos(vbnv_copy);
+			printk(BIOS_INFO, "VBNV: Flash backup restored\n");
+		} else {
+			printk(BIOS_INFO, "VBNV: Restore from flash failed\n");
+		}
+	}
+}
+
+void save_vbnv_cmos(const uint8_t *vbnv_copy)
+{
+	int i;
+
+	for (i = 0; i < VBOOT_VBNV_BLOCK_SIZE; i++)
+		cmos_write(vbnv_copy[i], CONFIG_VBOOT_VBNV_OFFSET + 14 + i);
+}
+
+void init_vbnv_cmos(int rtc_fail)
+{
+	uint8_t vbnv[VBOOT_VBNV_BLOCK_SIZE];
+
+	if (rtc_fail)
+		read_vbnv_cmos(vbnv);
+
+	cmos_init(rtc_fail);
+
+	if (rtc_fail)
+		save_vbnv_cmos(vbnv);
+}
+
+#if IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS_BACKUP_TO_FLASH)
+static void back_up_vbnv_cmos(void *unused)
+{
+	uint8_t vbnv_cmos[VBOOT_VBNV_BLOCK_SIZE];
+
+	/* Read current VBNV from CMOS. */
+	read_vbnv_cmos(vbnv_cmos);
+
+	/* Save to flash, will only be saved if different. */
+	save_vbnv_flash(vbnv_cmos);
+}
+BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_EXIT, back_up_vbnv_cmos, NULL);
+#endif