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# SPDX-License-Identifier: GPL-2.0
#
# CMake macros to build and install Linux kernel modules
# Copyright (C) 2020 Manuel Bentele <development@manuel-bentele.de>
#
# macro to define kernel module targets
macro(add_kernel_module MODULE_NAME KERNEL_BUILD_DIR KERNEL_INSTALL_DIR MODULE_MACRO MODULE_SOURCE_FILES MODULE_HEADER_FILES BUILD_SOURCE_FILE)
# create directory for kernel module
file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME})
# copy build source file
get_filename_component(BUILD_SOURCE_FILENAME ${BUILD_SOURCE_FILE} NAME)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${BUILD_SOURCE_FILENAME}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${BUILD_SOURCE_FILE} ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}
DEPENDS ${BUILD_SOURCE_FILE})
set(BUILD_SOURCE_FILE_PREPARED ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${BUILD_SOURCE_FILENAME})
# copy source files
foreach(MODULE_SOURCE_FILE ${MODULE_SOURCE_FILES})
get_filename_component(MODULE_SOURCE_FILENAME ${MODULE_SOURCE_FILE} NAME)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_SOURCE_FILENAME}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${MODULE_SOURCE_FILE} ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}
DEPENDS ${MODULE_SOURCE_FILE})
set(MODULE_SOURCE_FILES_PREPARED ${MODULE_SOURCE_FILES_PREPARED}
${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_SOURCE_FILENAME})
endforeach()
# copy header files
foreach(MODULE_HEADER_FILE ${MODULE_HEADER_FILES})
get_filename_component(MODULE_HEADER_FILENAME ${MODULE_HEADER_FILE} NAME)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_HEADER_FILENAME}
COMMAND ${CMAKE_COMMAND} -E copy_if_different ${MODULE_HEADER_FILE} ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}
DEPENDS ${MODULE_HEADER_FILE})
set(MODULE_HEADER_FILES_PREPARED ${MODULE_HEADER_FILES_PREPARED}
${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_HEADER_FILENAME})
endforeach()
# check if module depends on another module
if(NOT ${ARGV7} STREQUAL "")
set(MODULE_EXTRA_SYMBOLS ${CMAKE_CURRENT_BINARY_DIR}/${ARGV7}/Module.symvers)
endif()
# define build command
set(MODULE_BUILD_COMMAND ${CMAKE_MAKE_PROGRAM} ${MODULE_MACRO}
-C ${KERNEL_BUILD_DIR}
M=${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME} modules
EXTRA_CFLAGS=${KERNEL_C_FLAGS}
KBUILD_EXTRA_SYMBOLS=${MODULE_EXTRA_SYMBOLS})
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_NAME}.ko
COMMAND ${MODULE_BUILD_COMMAND}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}
COMMENT "Build kernel module ${MODULE_NAME}"
DEPENDS ${BUILD_SOURCE_FILE_PREPARED} ${MODULE_HEADER_FILES_PREPARED} ${MODULE_SOURCE_FILES_PREPARED}
VERBATIM)
add_custom_target(${MODULE_NAME} ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_NAME}.ko ${ARGV7})
# install kernel module
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${MODULE_NAME}/${MODULE_NAME}.ko
DESTINATION ${KERNEL_INSTALL_DIR}
PERMISSIONS OWNER_READ OWNER_WRITE GROUP_READ WORLD_READ
COMPONENT kernel)
endmacro(add_kernel_module)
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