mirror of
https://github.com/anrieff/libcpuid
synced 2024-12-16 16:35:45 +00:00
Add cpuid Linux kernel module for ARM CPUs
This commit is contained in:
parent
fb4abf78bb
commit
371a9648d6
9 changed files with 371 additions and 3 deletions
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@ -9,13 +9,16 @@ project(
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LANGUAGES C ASM_MASM
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VERSION ${VERSION})
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# CMake modules
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list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
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if(MSVC)
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set(LIBCPUID_SHARED OFF)
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else()
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set(LIBCPUID_SHARED ON)
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endif()
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option(BUILD_SHARED_LIBS "Build shared lib" ${LIBCPUID_SHARED})
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option(LIBCPUID_DRIVERS "Enable kernel drivers" ON)
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option(LIBCPUID_TESTS "Enable building tests" OFF)
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set(CMAKE_CXX_STANDARD 11)
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@ -47,8 +50,6 @@ elseif(${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD")
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endif()
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# Global variables
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list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")
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if(UNIX)
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include(GNUInstallDirs)
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set(prefix "${CMAKE_INSTALL_PREFIX}")
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@ -64,6 +65,9 @@ endif(UNIX)
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# Include subdirectories
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add_subdirectory(libcpuid)
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add_subdirectory(cpuid_tool)
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if(LIBCPUID_DRIVERS)
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add_subdirectory(drivers)
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endif()
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if(LIBCPUID_TESTS)
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add_subdirectory(tests)
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endif()
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24
cmake/FindLinuxKernelHeaders.cmake
Normal file
24
cmake/FindLinuxKernelHeaders.cmake
Normal file
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@ -0,0 +1,24 @@
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# Find the kernel release
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execute_process(
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COMMAND uname -r
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OUTPUT_VARIABLE KERNEL_RELEASE
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OUTPUT_STRIP_TRAILING_WHITESPACE
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)
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message(STATUS "Kernel release: ${KERNEL_RELEASE}")
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# Find the headers
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set(KERNELHEADERS_DIR "/usr/lib/modules/${KERNEL_RELEASE}/build")
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if(IS_DIRECTORY "${KERNELHEADERS_DIR}")
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message(STATUS "Kernel headers: ${KERNELHEADERS_DIR}")
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file(GLOB KERNELHEADERS_ARCH_INCLUDE_DIR LIST_DIRECTORIES true "${KERNELHEADERS_DIR}/arch/*/include")
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set(KERNELHEADERS_INCLUDE_DIRS
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"${KERNELHEADERS_DIR}/include"
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"${KERNELHEADERS_ARCH_INCLUDE_DIR}"
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CACHE PATH "Kernel headers include dirs"
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)
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set(KERNELHEADERS_FOUND 1 CACHE STRING "Set to 1 if kernel headers were found")
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else()
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set(KERNELHEADERS_FOUND 0 CACHE STRING "Set to 1 if kernel headers were found")
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endif()
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mark_as_advanced(KERNELHEADERS_FOUND)
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8
drivers/.gitignore
vendored
Normal file
8
drivers/.gitignore
vendored
Normal file
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@ -0,0 +1,8 @@
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!*/*/Makefile.in
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*.cmd
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*.o.d
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*.ko
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*.mod
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*.mod.c
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Module.symvers
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modules.order
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4
drivers/CMakeLists.txt
Normal file
4
drivers/CMakeLists.txt
Normal file
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@ -0,0 +1,4 @@
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# Include "arm" directory only for ARM CPUs
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if(("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "^armv.*") OR ("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "aarch64"))
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add_subdirectory(arm)
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endif()
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8
drivers/arm/CMakeLists.txt
Normal file
8
drivers/arm/CMakeLists.txt
Normal file
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@ -0,0 +1,8 @@
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option(LIBCPUID_DRIVER_DEBUG "Debug kernel module" OFF)
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if(LIBCPUID_DRIVER_DEBUG)
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add_definitions(-DLIBCPUID_DRIVER_DEBUG)
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endif(LIBCPUID_DRIVER_DEBUG)
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if("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
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add_subdirectory(linux)
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endif()
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38
drivers/arm/linux/CMakeLists.txt
Normal file
38
drivers/arm/linux/CMakeLists.txt
Normal file
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@ -0,0 +1,38 @@
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set(DRIVER_NAME "cpuid")
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option(LIBCPUID_DRIVER_ARM_LINUX_DKMS "Use DKMS for CPUID kernel module for ARM" ON)
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if(LIBCPUID_DRIVER_ARM_LINUX_DKMS)
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message(STATUS "Deploying DKMS configuration for CPUID kernel module...")
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set(LIBCPUID_SRC_DIR "/usr/src/${CMAKE_PROJECT_NAME}-${PROJECT_VERSION}")
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configure_file(dkms.conf.in "${CMAKE_CURRENT_BINARY_DIR}/dkms.conf")
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configure_file(Makefile.in "${CMAKE_CURRENT_BINARY_DIR}/Makefile_dkms")
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install(FILES
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cpuid.c
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"${CMAKE_SOURCE_DIR}/libcpuid/libcpuid_arm_driver.h"
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"${CMAKE_CURRENT_BINARY_DIR}/dkms.conf"
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DESTINATION "${LIBCPUID_SRC_DIR}/"
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)
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install(FILES
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"${CMAKE_CURRENT_BINARY_DIR}/Makefile_dkms"
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DESTINATION "${LIBCPUID_SRC_DIR}"
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RENAME "Makefile"
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)
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else(LIBCPUID_DRIVER_ARM_LINUX_DKMS)
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find_package(LinuxKernelHeaders REQUIRED)
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set(DRIVER_SOURCE "${DRIVER_NAME}.c")
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set(DRIVER_OBJECT "${DRIVER_NAME}.o")
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set(DRIVER_MODULE "${DRIVER_NAME}.ko")
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set(KBUILD_CMD "${CMAKE_MAKE_PROGRAM}" EXTRA_CFLAGS="-I${CMAKE_SOURCE_DIR}/libcpuid" -C "${KERNELHEADERS_DIR}" "src=${CMAKE_CURRENT_SOURCE_DIR}" "M=${CMAKE_CURRENT_BINARY_DIR}")
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add_custom_command(OUTPUT "${DRIVER_MODULE}"
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COMMAND ${KBUILD_CMD} modules
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WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
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DEPENDS "${DRIVER_SOURCE}"
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COMMENT "Building CPUID kernel module for ARM..."
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VERBATIM
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)
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add_custom_target(driver-arm-cpuid ALL DEPENDS "${DRIVER_MODULE}")
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endif(LIBCPUID_DRIVER_ARM_LINUX_DKMS)
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9
drivers/arm/linux/Makefile.in
Normal file
9
drivers/arm/linux/Makefile.in
Normal file
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@ -0,0 +1,9 @@
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obj-m += @DRIVER_NAME@.o
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all: modules
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modules:
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@$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
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clean:
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@$(MAKE) -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
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266
drivers/arm/linux/cpuid.c
Normal file
266
drivers/arm/linux/cpuid.c
Normal file
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@ -0,0 +1,266 @@
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/*
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* Copyright 2024 Veselin Georgiev,
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* anrieffNOSPAM @ mgail_DOT.com (convert to gmail)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This kernel module is inpired on msr: https://github.com/torvalds/linux/blob/master/arch/x86/kernel/msr.c */
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/smp.h>
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#include <linux/major.h>
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#include <linux/fs.h>
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <linux/version.h>
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#include "libcpuid_arm_driver.h"
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#ifdef LIBCPUID_DRIVER_DEBUG
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# define DPRINTF(format, ...) pr_info(format, __VA_ARGS__)
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#else
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# define DPRINTF(...)
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#endif
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#if defined(__arm__)
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# define cpuid_read_sysreg(aarch32, aarch64, value) asm volatile("mrc " aarch32 : "=r" (value))
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#elif defined(__aarch64__)
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# define cpuid_read_sysreg(aarch32, aarch64, value) asm volatile("mrs %0, " aarch64 : "=r" (value))
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#else
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# error This platform is not supported by this kernel module
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#endif
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static enum cpuhp_state cpuhp_cpuid_state;
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 2, 0))
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static char *cpuid_devnode(struct device *dev, umode_t *mode)
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#else
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static char *cpuid_devnode(const struct device *dev, umode_t *mode)
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#endif /* Linux 6.2 */
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{
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return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt));
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}
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0))
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static struct class *cpuid_class;
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#else
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static const struct class cpuid_class = {
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.name = "cpuid",
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.devnode = cpuid_devnode,
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};
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#endif /* Linux 6.6 */
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static void __read_reg_on_cpu(void *info)
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{
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struct read_reg_t *read_reg = info;
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DPRINTF("[cpuid,%d]: operating on request %d\n", __LINE__, read_reg->request);
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read_reg->value_64b = 0;
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switch(read_reg->request)
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{
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case REQ_MIDR: cpuid_read_sysreg("p15, 0, %0, c0, c0, 0", AARCH64_REG_MIDR_EL1, read_reg->value_64b); break;
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case REQ_MPIDR: cpuid_read_sysreg("p15, 0, %0, c0, c0, 5", AARCH64_REG_MPIDR_EL1, read_reg->value_64b); break;
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case REQ_REVIDR: cpuid_read_sysreg("p15, 0, %0, c0, c0, 6", AARCH64_REG_REVIDR_EL1, read_reg->value_64b); break;
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case REQ_ID_AFR0: cpuid_read_sysreg("p15, 0, %0, c0, c1, 3", AARCH64_REG_ID_AFR0, read_reg->value_32b); break;
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case REQ_ID_DFR0: cpuid_read_sysreg("p15, 0, %0, c0, c1, 2", AARCH64_REG_ID_DFR0, read_reg->value_32b); break;
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case REQ_ID_DFR1: cpuid_read_sysreg("p15, 0, %0, c0, c3, 5", AARCH64_REG_ID_DFR1, read_reg->value_32b); break;
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case REQ_ID_ISAR0: cpuid_read_sysreg("p15, 0, %0, c0, c2, 0", AARCH64_REG_ID_ISAR0, read_reg->value_32b); break;
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case REQ_ID_ISAR1: cpuid_read_sysreg("p15, 0, %0, c0, c2, 1", AARCH64_REG_ID_ISAR1, read_reg->value_32b); break;
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case REQ_ID_ISAR2: cpuid_read_sysreg("p15, 0, %0, c0, c2, 2", AARCH64_REG_ID_ISAR2, read_reg->value_32b); break;
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case REQ_ID_ISAR3: cpuid_read_sysreg("p15, 0, %0, c0, c2, 3", AARCH64_REG_ID_ISAR3, read_reg->value_32b); break;
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case REQ_ID_ISAR4: cpuid_read_sysreg("p15, 0, %0, c0, c2, 4", AARCH64_REG_ID_ISAR4, read_reg->value_32b); break;
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case REQ_ID_ISAR5: cpuid_read_sysreg("p15, 0, %0, c0, c2, 5", AARCH64_REG_ID_ISAR5, read_reg->value_32b); break;
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case REQ_ID_ISAR6: cpuid_read_sysreg("p15, 0, %0, c0, c2, 7", AARCH64_REG_ID_ISAR6, read_reg->value_32b); break;
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case REQ_ID_MMFR0: cpuid_read_sysreg("p15, 0, %0, c0, c1, 4", AARCH64_REG_ID_MMFR0, read_reg->value_32b); break;
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case REQ_ID_MMFR1: cpuid_read_sysreg("p15, 0, %0, c0, c1, 5", AARCH64_REG_ID_MMFR1, read_reg->value_32b); break;
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case REQ_ID_MMFR2: cpuid_read_sysreg("p15, 0, %0, c0, c1, 6", AARCH64_REG_ID_MMFR2, read_reg->value_32b); break;
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case REQ_ID_MMFR3: cpuid_read_sysreg("p15, 0, %0, c0, c1, 7", AARCH64_REG_ID_MMFR3, read_reg->value_32b); break;
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case REQ_ID_MMFR4: cpuid_read_sysreg("p15, 0, %0, c0, c2, 6", AARCH64_REG_ID_MMFR4, read_reg->value_32b); break;
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case REQ_ID_MMFR5: cpuid_read_sysreg("p15, 0, %0, c0, c3, 6", AARCH64_REG_ID_MMFR5, read_reg->value_32b); break;
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case REQ_ID_PFR0: cpuid_read_sysreg("p15, 0, %0, c0, c1, 0", AARCH64_REG_ID_PFR0, read_reg->value_32b); break;
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case REQ_ID_PFR1: cpuid_read_sysreg("p15, 0, %0, c0, c1, 1", AARCH64_REG_ID_PFR1, read_reg->value_32b); break;
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case REQ_ID_PFR2: cpuid_read_sysreg("p15, 0, %0, c0, c3, 4", AARCH64_REG_ID_PFR2, read_reg->value_32b); break;
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#if defined(__aarch64__)
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case REQ_ID_AA64AFR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64AFR0_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64AFR1: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64AFR1_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64DFR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64DFR0_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64DFR1: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64DFR1_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64ISAR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64ISAR0_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64ISAR1: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64ISAR1_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64ISAR2: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64ISAR2_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64MMFR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64MMFR0_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64MMFR1: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64MMFR1_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64MMFR2: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64MMFR2_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64MMFR3: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64MMFR3_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64MMFR4: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64MMFR4_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64PFR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64PFR0_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64PFR1: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64PFR1_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64PFR2: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64PFR2_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64SMFR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64SMFR0_EL1, read_reg->value_64b); break;
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case REQ_ID_AA64ZFR0: cpuid_read_sysreg(NULL, AARCH64_REG_ID_AA64ZFR0_EL1, read_reg->value_64b); break;
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#endif /* __aarch64__ */
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default:
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read_reg->request = REQ_INVALID;
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pr_warn("[cpuid,%d]: unknown operation requested: %d", __LINE__, read_reg->request);
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break;
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}
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DPRINTF("[cpuid,%d]: set value 0x%016llX\n", __LINE__, read_reg->value_64b);
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}
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static long cpuid_ioctl(struct file *file, unsigned int ioc, unsigned long arg)
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{
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u32 __user *uregs = (u32 __user *)arg;
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int err = 0;
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struct read_reg_t read_reg;
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const int cpu = iminor(file_inode(file));
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DPRINTF("[cpuid,%d]: received ioctl %u for cpu number %d\n", __LINE__, ioc, cpu);
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switch (ioc) {
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case ARM_IOC_READ_REG:
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if (!(file->f_mode & FMODE_READ)) {
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err = -EBADF;
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break;
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}
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if (copy_from_user(&read_reg, uregs, sizeof(read_reg))) {
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err = -EFAULT;
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break;
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}
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err = smp_call_function_single(cpu, __read_reg_on_cpu, &read_reg, 1);
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if (err)
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break;
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if (copy_to_user(uregs, &read_reg, sizeof(read_reg)))
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err = -EFAULT;
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break;
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default:
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err = -ENOTTY;
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break;
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}
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return err;
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}
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/*
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* File operations we support
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*/
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static const struct file_operations cpuid_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = cpuid_ioctl,
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.compat_ioctl = cpuid_ioctl,
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};
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static int cpuid_device_create(unsigned int cpu)
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{
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struct device *dev;
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0))
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dev = device_create(cpuid_class, NULL, MKDEV(CPUID_MAJOR, cpu), NULL, "cpuid%d", cpu);
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#else
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dev = device_create(&cpuid_class, NULL, MKDEV(CPUID_MAJOR, cpu), NULL, "cpuid%d", cpu);
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#endif /* Linux 6.6 */
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return PTR_ERR_OR_ZERO(dev);
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}
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static int cpuid_device_destroy(unsigned int cpu)
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{
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0))
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device_destroy(cpuid_class, MKDEV(CPUID_MAJOR, cpu));
|
||||
#else
|
||||
device_destroy(&cpuid_class, MKDEV(CPUID_MAJOR, cpu));
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init cpuid_init(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
DPRINTF("[cpuid,%d]: load module\n", __LINE__);
|
||||
if (__register_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid", &cpuid_fops)) {
|
||||
pr_err("unable to get major %d for cpuid\n", CPUID_MAJOR);
|
||||
return -EBUSY;
|
||||
}
|
||||
#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0))
|
||||
# if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 4, 0))
|
||||
cpuid_class = class_create(THIS_MODULE, "cpuid");
|
||||
# else
|
||||
cpuid_class = class_create("cpuid");
|
||||
# endif /* Linux 6.4 */
|
||||
if (IS_ERR(cpuid_class)) {
|
||||
err = PTR_ERR(cpuid_class);
|
||||
goto out_chrdev;
|
||||
}
|
||||
cpuid_class->devnode = cpuid_devnode;
|
||||
#else
|
||||
err = class_register(&cpuid_class);
|
||||
if (err)
|
||||
goto out_chrdev;
|
||||
#endif /* Linux 6.6 */
|
||||
|
||||
#if defined(__aarch64__)
|
||||
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm64/cpuid:online", cpuid_device_create, cpuid_device_destroy);
|
||||
#else
|
||||
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "arm/cpuid:online", cpuid_device_create, cpuid_device_destroy);
|
||||
#endif
|
||||
if (err < 0)
|
||||
goto out_class;
|
||||
cpuhp_cpuid_state = err;
|
||||
return 0;
|
||||
|
||||
out_class:
|
||||
#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0))
|
||||
class_destroy(cpuid_class);
|
||||
#else
|
||||
class_unregister(&cpuid_class);
|
||||
#endif /* Linux 6.6 */
|
||||
out_chrdev:
|
||||
__unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid");
|
||||
return err;
|
||||
}
|
||||
module_init(cpuid_init);
|
||||
|
||||
static void __exit cpuid_exit(void)
|
||||
{
|
||||
DPRINTF("[cpuid,%d]: unload module\n", __LINE__);
|
||||
cpuhp_remove_state(cpuhp_cpuid_state);
|
||||
#if (LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0))
|
||||
class_destroy(cpuid_class);
|
||||
#else
|
||||
class_unregister(&cpuid_class);
|
||||
#endif /* Linux 6.6 */
|
||||
__unregister_chrdev(CPUID_MAJOR, 0, NR_CPUS, "cpu/cpuid");
|
||||
}
|
||||
module_exit(cpuid_exit)
|
||||
|
||||
MODULE_AUTHOR("The Tumultuous Unicorn Of Darkness");
|
||||
MODULE_DESCRIPTION("ARM registers driver for libcpuid");
|
||||
MODULE_LICENSE("Dual BSD/GPL");
|
||||
MODULE_VERSION("0.1");
|
7
drivers/arm/linux/dkms.conf.in
Normal file
7
drivers/arm/linux/dkms.conf.in
Normal file
|
@ -0,0 +1,7 @@
|
|||
PACKAGE_NAME="@CMAKE_PROJECT_NAME@"
|
||||
PACKAGE_VERSION="@PROJECT_VERSION@"
|
||||
MAKE="make"
|
||||
CLEAN="make clean"
|
||||
BUILT_MODULE_NAME[0]="@DRIVER_NAME@"
|
||||
DEST_MODULE_LOCATION[0]="/kernel/drivers/misc/@DRIVER_NAME@"
|
||||
AUTOINSTALL="yes"
|
Loading…
Reference in a new issue