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Added linux kernel module

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This commit is contained in:
Mickey Malone
2021-02-06 11:59:39 -06:00
parent c64e6d5cc7
commit b076133178
4 changed files with 75 additions and 0 deletions
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2
CMakeLists.txt
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@@ -3,9 +3,11 @@ cmake_minimum_required(VERSION 3.13)
include(pico_sdk_import.cmake)
project(pico_rng C CXX ASM)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)
pico_sdk_init()
add_subdirectory(firmware)
add_subdirectory(driver)

49
driver/CMakeLists.txt Normal file
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@@ -0,0 +1,49 @@
cmake_minimum_required(VERSION 3.13)
project(pico_rng_driver LANGUAGES C)
set(CMAKE_C_STANDARD 11)
set(CMAKE_CXX_STANDARD 17)
# Find kernel headers
execute_process(
COMMAND uname -r
OUTPUT_VARIABLE KERNEL_RELEASE
OUTPUT_STRIP_TRAILING_WHITESPACE
)
# Find the headers
find_path(KERNELHEADERS_DIR
include/linux/user.h
PATHS /usr/src/linux-headers-${KERNEL_RELEASE}
)
message(STATUS "Kernel release: ${KERNEL_RELEASE}")
message(STATUS "Kernel headers: ${KERNELHEADERS_DIR}")
if (KERNELHEADERS_DIR)
set(KERNELHEADERS_INCLUDE_DIRS
${KERNELHEADERS_DIR}/include
${KERNELHEADERS_DIR}/arch/x86/include
CACHE PATH "Kernel headers include dirs"
)
set(KERNELHEADERS_FOUND 1 CACHE STRING "Set to 1 if kernel headers were found")
else (KERNELHEADERS_DIR)
set(KERNELHEADERS_FOUND 0 CACHE STRING "Set to 1 if kernel headers were found")
endif (KERNELHEADERS_DIR)
mark_as_advanced(KERNELHEADERS_FOUND)
#find_package(KernelHeaders REQUIRED)
include_directories(${KERNELHEADERS_INCLUDE_DIRS})
set(DRIVER_FILE pico_rng.ko)
set(KBUILD_CMD $(MAKE) -C ${KERNELHEADERS_DIR} modules M=${CMAKE_CURRENT_BINARY_DIR} src=${CMAKE_CURRENT_SOURCE_DIR})
#FILE(WRITE ${CMAKE_CURRENT_SOURCE_DIR}/Kbuild "obj-m := pico_rng.o")
add_custom_command(OUTPUT ${DRIVER_FILE}
COMMAND ${KBUILD_CMD}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
DEPENDS pico_rng.c VERBATIM)
add_custom_target(pico_rng_driver ALL DEPENDS ${DRIVER_FILE})

1
driver/Kbuild Normal file
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@@ -0,0 +1 @@
obj-m := pico_rng.o

23
driver/pico_rng.c Normal file
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@@ -0,0 +1,23 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mickey Malone");
MODULE_DESCRIPTION("Random number generator using a Raspberry Pi Pico");
MODULE_VERSION("1.0");
static int __init driver_init(void)
{
printk(KERN_INFO "Raspberry Pi Pico RNG\n");
return 0;
}
static void __exit driver_exit(void)
{
return;
}
module_init(driver_init);
module_exit(driver_exit);