elog: Add function to log boot reason in ChromeOS case

This adds a generic helper function for adding boot reason in the
ChromeOS case. If vboot is enabled, it will use information passed
in via the vboot handoff table in cbmem to determine mode and
reason in the case of recovery.

BUG=chromium:373467
BRANCH=nyan
TEST=built along with follow-up CL and booted on Big under various
modes, verified entry was added to eventlog with "mosys eventlog list"
Signed-off-by: David Hendricks <dhendrix@chromium.org>

Original-Change-Id: I50a7aa6d55eb46413fe9929e732d6eb18c758d4b
Original-Reviewed-on: https://chromium-review.googlesource.com/199690
Original-Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Original-Commit-Queue: David Hendricks <dhendrix@chromium.org>
Original-Tested-by: David Hendricks <dhendrix@chromium.org>
(cherry picked from commit 961c0bd1dd5512b1c2feb2ed4391bf507900eb7a)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: I6ae4e2a891966d2d1de7d37dcc551383e94e4d75
Reviewed-on: http://review.coreboot.org/7991
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>

src/vendorcode/google/chromeos/Makefile.inc

@@ -22,7 +22,7 @@ ramstage-$(CONFIG_ARCH_RAMSTAGE_X86_32) += vbnv_cmos.c
 romstage-$(CONFIG_ARCH_ROMSTAGE_ARMV7) += vbnv_ec.c
 ramstage-$(CONFIG_ARCH_RAMSTAGE_ARMV7) += vbnv_ec.c
 romstage-$(CONFIG_ARCH_ROMSTAGE_X86_32) += vboot.c
-
+ramstage-$(CONFIG_ELOG) += elog.c
 ramstage-y += gnvs.c
 romstage-y += fmap.c
 ramstage-y += fmap.c

src/vendorcode/google/chromeos/chromeos.h

@@ -34,8 +34,12 @@ void save_vbnv(const uint8_t *vbnv_copy);
 #if CONFIG_CHROMEOS
 /* functions implemented in vboot.c */
 void init_chromeos(int bootmode);
+
+/* functions implemented in elog.c */
+void elog_add_boot_reason(void);
 #else
 static inline void init_chromeos(int bootmode) { }
+static inline void elog_add_boot_reason(void) { return; }
 #endif /* CONFIG_CHROMEOS */
 
 struct romstage_handoff;

src/vendorcode/google/chromeos/elog.c

@@ -0,0 +1,55 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 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.
+ *
+ * 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 <cbmem.h>
+#include <console/console.h>
+#include <elog.h>
+#include <vendorcode/google/chromeos/chromeos.h>
+#if CONFIG_VBOOT_VERIFY_FIRMWARE
+#include "vboot_handoff.h"
+#include <vboot_struct.h>
+#endif
+
+void elog_add_boot_reason(void)
+{
+	if (developer_mode_enabled()) {
+		elog_add_event(ELOG_TYPE_CROS_DEVELOPER_MODE);
+		printk(BIOS_DEBUG, "%s: Logged dev mode boot\n", __func__);
+	} else if (recovery_mode_enabled()) {
+		u8 reason = 0;
+#if CONFIG_VBOOT_VERIFY_FIRMWARE
+		struct vboot_handoff *vbho = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+		reason = get_recovery_mode_from_vbnv();
+		if (vbho && !reason) {
+			VbSharedDataHeader *sd = (VbSharedDataHeader *)
+				vbho->shared_data;
+			reason = sd->recovery_reason;
+		}
+#endif
+
+		elog_add_event_byte(ELOG_TYPE_CROS_RECOVERY_MODE,
+			reason ? reason : ELOG_CROS_RECOVERY_MODE_BUTTON);
+		printk(BIOS_DEBUG, "%s: Logged recovery mode boot, "
+				"reason: 0x%02x\n", __func__, reason);
+	} else {
+		printk(BIOS_DEBUG, "%s: Normal mode boot, nothing "
+					"interesting to log\n", __func__);
+	}
+}