motorola/omap4: use kexec for recovery-kernel

Use kexec to boot a custom kernel for TWRP instead of running
it on the stock kernel. This adds SELinux-support to the
recovery.

Change-Id: I4bc3987b6d703adecb4305159b80425ae3c6df46

Author: stargo

safestrap/devices/motorola/common-omap4/build-install-kexec.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+#sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/common/build-install.sh
+cd $OUT
+rm $OUT/APP/install-files.zip
+rm $OUT/install-files/etc/safestrap/2nd-init.zip
+rm $OUT/install-files/etc/safestrap/ramdisk-recovery.img
+zip -9rj install-files/etc/safestrap/2nd-init 2nd-init-files/*
+
+cd $OUT/recovery/root
+# copy correct bbx and fixboot.sh
+cp $ANDROID_BUILD_TOP/bootable/recovery/safestrap/bbx ./sbin/bbx
+cp $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/common/2nd-init-files/fixboot.sh ./sbin/fixboot.sh
+cp $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/init.rc ./init.rc
+
+#kexec-files
+cp $ANDROID_BUILD_TOP/device/motorola/omap4-common/kexec/* $OUT/install-files/etc/safestrap/kexec/
+
+#kernel
+cp $OUT/kernel $OUT/install-files/etc/safestrap/kexec/kernel

safestrap/devices/motorola/common-omap4/build-safestrap.sh

@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
 mkdir -p $OUT/APP
 mkdir -p $OUT/install-files/bin/
+mkdir -p $OUT/install-files/etc/safestrap/kexec/
 mkdir -p $OUT/install-files/etc/safestrap/res/
 mkdir -p $OUT/install-files/etc/safestrap/rootfs/
 mkdir -p $OUT/recovery/root/etc
+mkdir -p $OUT/recovery/root/etc/firmware
 mkdir -p $OUT/recovery/root/sbin
 cd $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola
 cp -fr common-omap4/res/* $OUT/install-files/etc/safestrap/res/

safestrap/devices/motorola/common-omap4/hijack

@@ -137,6 +137,33 @@ if [ "$RUN_SS" = "1" ]; then
 	fi
 
 	if [ "$ENTER_RECOVERY" = "1" ]; then
+		# check for kexec files
+		if [ -e "$RECOVERY_DIR/kexec/kernel" ]; then
+			$BBX cp $RECOVERY_DIR/ramdisk-recovery.img /
+			$BBX cp $RECOVERY_DIR/kexec/* /
+
+			# unmount SS
+			$BBX umount $SS_MNT
+			if [ "$SS_USE_DATAMEDIA" = "1" ]; then
+				$BBX umount $DATAMEDIA_MNT
+			fi
+			$BBX umount -l /system
+
+			/sbin/hijack.killall
+
+			cd /
+			$BBX chmod 755 /kexec
+			$BBX chown 0.2000 /kexec
+			$BBX insmod /uart.ko
+			$BBX insmod /arm_kexec.ko
+			$BBX insmod /kexec.ko
+			/kexec -l /kernel --devtree=/devtree --ramdisk=/ramdisk-recovery.img
+			$BBX sleep 1
+			/kexec -e
+			exit
+		fi
+
+		# fall back to non-kexec recovery
 		# filesystem cleanup
 		$BBX rm /d
 		$BBX rm /etc

safestrap/devices/motorola/common-omap4/safestrap-common-omap4.mk

@@ -1,3 +1,12 @@
+#SAFESTRAP COMMON
+SS_INCLUDE_2NDINIT := true
+SS_INCLUDE_SPLASHMENU := true
+BOARD_USE_NO_DEVFS_SETUP := false
+BOARD_SUPPRESS_EMMC_WIPE := true
+
+# Logging
+#TWRP_EVENT_LOGGING := true
+
 #TWRP
 TW_INTERNAL_STORAGE_PATH := "/sdcard"
 TW_INTERNAL_STORAGE_MOUNT_POINT := "sdcard"
@@ -15,8 +24,8 @@ BOARD_DEFAULT_VIRT_SYSTEM_MAX_SIZE := 1000
 BOARD_DEFAULT_VIRT_DATA_SIZE := 2000
 BOARD_DEFAULT_VIRT_DATA_MIN_SIZE := 1000
 BOARD_DEFAULT_VIRT_DATA_MAX_SIZE := 16000
-BOARD_DEFAULT_VIRT_CACHE_SIZE := 300
-BOARD_DEFAULT_VIRT_CACHE_MIN_SIZE := 300
+BOARD_DEFAULT_VIRT_CACHE_SIZE := 10
+BOARD_DEFAULT_VIRT_CACHE_MIN_SIZE := 10
 BOARD_DEFAULT_VIRT_CACHE_MAX_SIZE := 1000
 
 TW_CUSTOM_BATTERY_CAPACITY_FIELD := charge_counter

safestrap/devices/motorola/maserati/build-install.sh

@@ -1,4 +1,14 @@
 #!/usr/bin/env bash
-sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/build-install.sh
+
+# target specific init.rc (blockdev-symlinks)
+cp $ANDROID_BUILD_TOP/device/motorola/maserati/init.target.rc $OUT/recovery/root/
+
+#ducati-firmware is needed for kexecd kernel
+cp $ANDROID_BUILD_TOP/vendor/motorola/maserati/proprietary/etc/firmware/ducati-m3.bin $OUT/recovery/root/etc/firmware/
+
+#kexec-files
+cp $ANDROID_BUILD_TOP/device/motorola/maserati/kexec/* $OUT/install-files/etc/safestrap/kexec/
+
+sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/build-install-kexec.sh
 sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/common/build-install-finish.sh
 

safestrap/devices/motorola/maserati/safestrap.mk

@@ -1,4 +1,4 @@
-include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/common/safestrap-common.mk
+#include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/common/safestrap-common.mk
 include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/motorola/common-omap4/safestrap-common-omap4.mk
 
 TW_BRIGHTNESS_PATH := /sys/class/backlight/lm3532_bl/brightness

safestrap/devices/motorola/spyder/build-install.sh

@@ -1,4 +1,14 @@
 #!/usr/bin/env bash
-sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/build-install.sh
+
+# target specific init.rc (blockdev-symlinks)
+cp $ANDROID_BUILD_TOP/device/motorola/spyder/init.target.rc $OUT/recovery/root/
+
+#ducati-firmware is needed for kexecd kernel
+cp $ANDROID_BUILD_TOP/vendor/motorola/spyder/proprietary/etc/firmware/ducati-m3.bin $OUT/recovery/root/etc/firmware/
+
+#kexec-files
+cp $ANDROID_BUILD_TOP/device/motorola/spyder/kexec/* $OUT/install-files/etc/safestrap/kexec/
+
+sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/build-install-kexec.sh
 sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/common/build-install-finish.sh
 

safestrap/devices/motorola/spyder/safestrap.mk

@@ -1,3 +1,3 @@
-include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/common/safestrap-common.mk
+#include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/common/safestrap-common.mk
 include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/motorola/common-omap4/safestrap-common-omap4.mk
 

safestrap/devices/motorola/targa/build-install.sh

@@ -1,4 +1,14 @@
 #!/usr/bin/env bash
-sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/build-install.sh
+
+# target specific init.rc (blockdev-symlinks)
+cp $ANDROID_BUILD_TOP/device/motorola/targa/init.target.rc $OUT/recovery/root/
+
+#ducati-firmware is needed for kexecd kernel
+cp $ANDROID_BUILD_TOP/vendor/motorola/targa/proprietary/etc/firmware/ducati-m3.bin $OUT/recovery/root/etc/firmware/
+
+#kexec-files
+cp $ANDROID_BUILD_TOP/device/motorola/targa/kexec/* $OUT/install-files/etc/safestrap/kexec/
+
+sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/motorola/common-omap4/build-install-kexec.sh
 sh $ANDROID_BUILD_TOP/bootable/recovery/safestrap/devices/common/build-install-finish.sh
 

safestrap/devices/motorola/targa/safestrap.mk

@@ -1,4 +1,4 @@
-include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/common/safestrap-common.mk
+#include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/common/safestrap-common.mk
 include $(ANDROID_BUILD_TOP)/bootable/recovery/safestrap/devices/motorola/common-omap4/safestrap-common-omap4.mk
 
 TW_BRIGHTNESS_PATH := /sys/class/backlight/lm3532_bl/brightness