Initial commit

package/boot/kexec-tools/Config.in

@@ -0,0 +1,14 @@
+menu "Configuration"
+	depends on PACKAGE_kexec
+
+config KEXEC_ZLIB
+	bool
+	prompt "zlib support"
+	default y
+
+config KEXEC_LZMA
+	bool
+	prompt "lzma support"
+	default n
+
+endmenu

package/boot/kexec-tools/Makefile

@@ -0,0 +1,99 @@
+#
+# Copyright (C) 2006-2012 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=kexec-tools
+PKG_VERSION:=2.0.21
+PKG_RELEASE:=2
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=@KERNEL/linux/utils/kernel/kexec
+PKG_HASH:=e113142dee891638ad96e0f72cf9277b244477619470b30c41999d312e8e8702
+
+PKG_CONFIG_DEPENDS := CONFIG_KEXEC_ZLIB CONFIG_KEXEC_LZMA
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/kexec-tools/Default
+  SECTION:=utils
+  CATEGORY:=Utilities
+  URL:=http://kernel.org/pub/linux/kernel/people/horms/kexec-tools/
+endef
+
+define Package/kexec-tools
+  $(call Package/kexec-tools/Default)
+  TITLE:=kexec-tools transition meta package
+  DEPENDS:=+kexec
+endef
+
+define Package/kexec-tools/description
+ kexec is a set of system calls that allows you to load
+ another kernel from the currently executing Linux kernel.
+ The kexec utility allows to load and boot another kernel.
+endef
+
+define Package/kexec
+  $(call Package/kexec-tools/Default)
+  TITLE:=Kernel boots kernel
+  DEPENDS:=\
+	@(armeb||arm||i386||x86_64||powerpc64||mipsel||mips) \
+	+KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma @KERNEL_KEXEC
+endef
+
+define Package/kexec/description
+ The kexec utility allows to load and boot another kernel.
+endef
+
+define Package/kexec/config
+	source "$(SOURCE)/Config.in"
+endef
+
+KEXEC_TARGET_NAME:=$(ARCH)-linux-$(TARGET_SUFFIX)
+
+CONFIGURE_ARGS = \
+		--target=$(KEXEC_TARGET_NAME) \
+		--host=$(REAL_GNU_TARGET_NAME) \
+		--build=$(GNU_HOST_NAME) \
+		--program-prefix="" \
+		--program-suffix="" \
+		--prefix=/usr \
+		--exec-prefix=/usr \
+		--bindir=/usr/bin \
+		--sbindir=/usr/sbin \
+		--libexecdir=/usr/lib \
+		--sysconfdir=/etc \
+		$(if $(CONFIG_KEXEC_ZLIB),--with,--without)-zlib \
+		$(if $(CONFIG_KEXEC_LZMA),--with,--without)-lzma \
+		TARGET_LD="$(TARGET_CROSS)ld"
+
+TARGET_CFLAGS += -ffunction-sections -fdata-sections
+TARGET_LDFLAGS += -Wl,--gc-sections
+
+CONFIGURE_VARS += \
+	BUILD_CC="$(HOSTCC)" \
+	TARGET_CC="$(TARGET_CC)"
+
+define Build/Compile
+	$(MAKE) -C $(PKG_BUILD_DIR) DESTDIR="$(PKG_INSTALL_DIR)" all install
+endef
+
+define Package/kexec-tools/install
+	:
+endef
+
+define Package/kexec/install
+	$(INSTALL_DIR) $(1)/usr/sbin
+	$(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kexec $(1)/usr/sbin
+
+# make a link for compatability with other distros
+	$(INSTALL_DIR) $(1)/sbin
+	$(LN) ../usr/sbin/kexec $(1)/sbin/kexec
+endef
+
+$(eval $(call BuildPackage,kexec-tools))
+$(eval $(call BuildPackage,kexec))

package/boot/kexec-tools/files/kdump.config

@@ -0,0 +1,7 @@
+
+config kdump
+	option enabled '1'
+	option save_dmesg '1'
+	option save_vmcore '0'
+# using an external partition to store vmcore is highly recommended!
+#	option path '/mnt/crashdump'

package/boot/kexec-tools/files/kdump.defaults

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# kB disable if mem low than 256MB
+memtotal=`grep MemTotal /proc/meminfo | awk '{print $2}'`
+if test $memtotal -le 262144; then
+	exit 0
+fi
+KZ=128
+if test $memtotal -ge 8388608; then
+	KZ=512
+elif test $memtotal -ge 4194304; then
+	KZ=256
+fi
+
+case $(uname -m) in
+	i?86|x86_64)
+		if ! grep -q crashkernel /boot/grub/grub.cfg; then
+			mount /boot -o remount,rw
+			sed -i "s/linux.*/& crashkernel=${KZ}M/" /boot/grub/grub.cfg
+			mount /boot -o remount,ro
+		fi
+		;;
+esac

package/boot/kexec-tools/files/kdump.init

@@ -0,0 +1,186 @@
+#!/bin/sh /etc/rc.common
+
+START=41
+STOP=90
+
+BOOT_IMAGE=/boot/vmlinuz
+
+EXTRA_COMMANDS="status"
+EXTRA_HELP="        status  Print crashkernel status"
+
+verify_kdump() {
+	local cfg="$1"
+	local enabled
+	local path
+	local save_vmcore
+	local save_dmesg
+
+	config_get_bool enabled "$cfg" enabled 1
+	config_get_bool save_dmesg "$cfg" save_dmesg 1
+	config_get_bool save_vmcore "$cfg" save_vmcore 0
+
+	[ "$enabled" -gt 0 ] || return 2
+
+	[ "$save_dmesg" -gt 0 ] || [ "$save_vmcore" -gt 0 ] || return 2
+
+	config_get path "$cfg" path "/"
+
+	[ -d "$path" ] || mkdir -p "$path" 2>/dev/null || return 1
+}
+
+run_kdump() {
+	local cfg="$1"
+	local enabled
+	local path
+	local save_vmcore
+	local save_dmesg
+
+	config_get_bool enabled "$cfg" enabled 1
+	[ "$enabled" -gt 0 ] || return
+
+	config_get_bool save_dmesg "$cfg" save_dmesg 1
+	config_get_bool save_vmcore "$cfg" save_vmcore 0
+	config_get path "$cfg" path "/"
+
+	timestamp=$(date "+%Y%m%dT%H%M%S")
+
+	if [ "$save_vmcore" -eq 1 ]; then
+		echo -n "Saving vmcore (this may take a while)..."
+		# would like 'sparse' but busybox doesn't support it
+		dd if=/proc/vmcore of="$path/vmcore-$timestamp" conv=fsync bs=1M
+		echo " done"
+	fi
+
+	if [ "$save_dmesg" -eq 1 ]; then
+		vmcore-dmesg /proc/vmcore > "$path/dmesg-$timestamp"
+	fi
+
+	sync
+	reboot -f
+}
+
+find_kernel() {
+	. /lib/functions.sh
+	local kernel
+
+	kernel="$BOOT_IMAGE"
+	if [ -r "$kernel" ]; then
+		echo $kernel
+		return 0
+	fi
+
+	kernel="$(find_mtd_part kernel)"
+	if [ -r "$kernel" ]; then
+		echo $kernel
+		return 0
+	fi
+
+	for voldir in /sys/class/ubi/ubi*_*; do
+		[ ! -e "$voldir" ] && continue
+		if [ "$(cat "${voldir}/name")" = "kernel" ]; then
+			kernel="/dev/$(basename "$voldir")"
+			echo $kernel
+			return 0
+		fi
+	done
+
+	return 1
+}
+
+load_crashkernel() {
+	local append_cmdline
+	local kernel
+
+	kernel="$(find_kernel)"
+	[ $? -gt 0 ] && return 1
+
+	case "$(uname -m)" in
+		i?86|x86_64)
+			grep -q "crashkernel=" /proc/cmdline || return 1
+			append_cmdline="1 irqpoll reset_devices maxcpus=1"
+			;;
+		arm*)
+			append_cmdline="1 maxcpus=1 reset_devices"
+			;;
+	esac
+	kexec -p "$kernel" --reuse-cmdline --append="$append_cmdline"
+	return $?
+}
+
+start() {
+	local retval
+
+	if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
+		return 1
+	fi
+
+	if [ -e /proc/vmcore ]; then
+		config_load kdump
+		config_foreach run_kdump kdump
+	else
+		config_load kdump
+		config_foreach verify_kdump kdump
+		retval=$?
+		[ $retval = 1 ] && return 1
+		[ $retval = 0 ] && load_crashkernel
+		return $?
+	fi
+}
+
+stop() {
+	[ "$(cat /sys/kernel/kexec_crash_loaded)" = "1" ] || return
+
+	if [ -e "$BOOT_IMAGE" ]; then
+		kexec -p -u "$BOOT_IMAGE"
+	fi
+}
+
+status() {
+	local retval kernel
+
+	if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
+		echo "crashdump not supported by kernel"
+		return
+	fi
+
+	if [ $(cat /sys/kernel/kexec_crash_size) -eq 0 ]; then
+		echo "memory for crashdump kernel not reserved!"
+		echo "check crashkernel= kernel cmdline parameter"
+		echo "(a reboot is required after installing kdump)"
+		return
+	fi
+
+	kernel="$(find_kernel)"
+	if [ $? -gt 0 ]; then
+		echo "cannot find kernel image"
+		return
+	else
+		echo "using kernel image $kernel"
+	fi
+
+	echo -n "kdump configuration is "
+	config_load kdump
+	retval=$?
+	if [ $retval = 0 ]; then
+		if [ "$(config_foreach echo kdump)" ]; then
+			config_foreach verify_kdump kdump
+			retval=$?
+		else
+			retval=1
+		fi
+	fi
+
+	if [ $retval = 0 ]; then
+		echo "valid"
+	elif [ $retval = 2 ]; then
+		echo "disabled"
+	else
+		echo "BROKEN"
+	fi
+
+	echo -n "kexec crash kernel "
+	if [ "$(cat /sys/kernel/kexec_crash_loaded)" = "0" ]; then
+		echo -n "not "
+	fi
+	echo "loaded"
+}

package/boot/kexec-tools/patches/001-arm-do-not-copy-magic-4-bytes-of-appended-DTB-in-zIm.patch

@@ -0,0 +1,52 @@
+From 9817ec81968a5eec7863902833fb77680544eae4 Mon Sep 17 00:00:00 2001
+From: Alexander Egorenkov <egorenar-dev@posteo.net>
+Date: Mon, 12 Apr 2021 13:18:05 +0200
+Subject: [PATCH 1/1] arm: do not copy magic 4 bytes of appended DTB in zImage
+
+If the passed zImage happens to have a DTB appended, then the magic 4 bytes
+of the DTB are copied together with the kernel image. This leads to
+failed kexec boots because the decompressor finds the aforementioned
+DTB magic and falsely tries to replace the DTB passed in the register r2
+with the non-existent appended one.
+
+Signed-off-by: Alexander Egorenkov <egorenar-dev@posteo.net>
+Signed-off-by: Simon Horman <horms@verge.net.au>
+---
+ kexec/arch/arm/kexec-zImage-arm.c | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+--- a/kexec/arch/arm/kexec-zImage-arm.c
++++ b/kexec/arch/arm/kexec-zImage-arm.c
+@@ -382,6 +382,7 @@ int zImage_arm_load(int argc, char **arg
+ 	unsigned int atag_offset = 0x1000; /* 4k offset from memory start */
+ 	unsigned int extra_size = 0x8000; /* TEXT_OFFSET */
+ 	const struct zimage_tag *tag;
++	size_t kernel_buf_size;
+ 	size_t kernel_mem_size;
+ 	const char *command_line;
+ 	char *modified_cmdline = NULL;
+@@ -538,6 +539,15 @@ int zImage_arm_load(int argc, char **arg
+ 	}
+ 
+ 	/*
++	 * Save the length of the compressed kernel image w/o the appended DTB.
++	 * This will be required later on when the kernel image contained
++	 * in the zImage will be loaded into a kernel memory segment.
++	 * And we want to load ONLY the compressed kernel image from the zImage
++	 * and discard the appended DTB.
++	 */
++	kernel_buf_size = len;
++
++	/*
+ 	 * Always extend the zImage by four bytes to ensure that an appended
+ 	 * DTB image always sees an initialised value after _edata.
+ 	 */
+@@ -759,7 +769,7 @@ int zImage_arm_load(int argc, char **arg
+ 		add_segment(info, dtb_buf, dtb_length, dtb_offset, dtb_length);
+ 	}
+ 
+-	add_segment(info, buf, len, kernel_base, kernel_mem_size);
++	add_segment(info, buf, kernel_buf_size, kernel_base, kernel_mem_size);
+ 
+ 	info->entry = (void*)kernel_base;
+