From 72124d7edfb43dc2f003f18c6ad372bb7f655330 Mon Sep 17 00:00:00 2001
From: Matt Madison <matt@madison.systems>
Date: Wed, 14 Dec 2022 14:12:23 -0800
Subject: [PATCH] tegra-flash-reboot: add recipe

to provide a small utility to reboot into recovery mode,
which can't be done with busybox's reboot command.

Signed-off-by: Matt Madison <matt@madison.systems>
---
 .../tegra-flash-reboot/reboot-recovery.c      | 16 ++++++++++++++
 .../initrdscripts/tegra-flash-reboot_1.0.bb   | 21 +++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 recipes-core/initrdscripts/tegra-flash-reboot/reboot-recovery.c
 create mode 100644 recipes-core/initrdscripts/tegra-flash-reboot_1.0.bb

diff --git a/recipes-core/initrdscripts/tegra-flash-reboot/reboot-recovery.c b/recipes-core/initrdscripts/tegra-flash-reboot/reboot-recovery.c
new file mode 100644
index 00000000..9ff670ba
--- /dev/null
+++ b/recipes-core/initrdscripts/tegra-flash-reboot/reboot-recovery.c
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: MIT */
+#include <linux/reboot.h>
+#include <sys/reboot.h>
+#include <sys/syscall.h>
+
+static inline int sys_reboot(const void *arg) {
+	return (int) syscall(SYS_reboot, LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, arg);
+}
+
+int
+main (int argc, char *argv[])
+{
+	if (argc > 1)
+		return sys_reboot(argv[1]);
+	return sys_reboot("forced-recovery");
+}
diff --git a/recipes-core/initrdscripts/tegra-flash-reboot_1.0.bb b/recipes-core/initrdscripts/tegra-flash-reboot_1.0.bb
new file mode 100644
index 00000000..d48c9fae
--- /dev/null
+++ b/recipes-core/initrdscripts/tegra-flash-reboot_1.0.bb
@@ -0,0 +1,21 @@
+DESCRIPTION = "Utility to force reboot into recovery mode"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+SRC_URI = "file://reboot-recovery.c"
+
+COMPATIBLE_MACHINE = "(tegra)"
+
+S = "${WORKDIR}"
+B = "${WORKDIR}/build"
+
+do_compile() {
+    $CC $CFLAGS $LDFLAGS -o ${B}/reboot-recovery ${S}/reboot-recovery.c
+}
+
+do_install() {
+    install -d ${D}${bindir}
+    install -m 0755 ${B}/reboot-recovery ${D}${bindir}/
+}
+
+PACKAGE_ARCH = "${TEGRA_PKGARCH}"