smcchar

Build

x64 debug build

To debug the module it is possible to build the module without ARM64 inline assembly by setting SYSCASE_DUMMY=1:

$ SYSCASE_DUMMY=1 SYSCASE=../syscase make 

OPTEE cross compile build

To cross compile the module for ARM64 we can use the OPTEE aarch64 toolchain in optee/toolchains/aarch64:

$ SYSCASE=../syscase make KDIR=`pwd`/../../../linux ARCH=arm64 CROSS_COMPILE=`pwd`/../../../toolchains/aarch64/bin/aarch64-linux-gnu-

OPTEE

Adding the module to gen_rootfs

• Copy smcchar.ko to optee/gen_rootfs/etc
• Add the following line to optee/gen_rootfs/filelist.txt

file /etc/smcchar.ko etc/smcchar.ko 644 0 0

Loading the module

Start OPTEE and execute following commands to load smcchar.ko:

# mound_shared /mnt
# insmod /mnt/optee_examples/agent/smcchar/smcchar.ko