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Kernel: Introduce basic pre-kernel environment

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This implements a simple bootloader that is capable of loading ELF64
kernel images. It does this by using QEMU/GRUB to load the kernel image
from disk and pass it to our bootloader as a Multiboot module.

The bootloader then parses the ELF image and sets it up appropriately.
The kernel's entry point is a C++ function with architecture-native
code.

Co-authored-by: Liav A <liavalb@gmail.com>
This commit is contained in:
Gunnar Beutner 2021-07-18 14:47:32 +02:00 • committed by Andreas Kling
parent 357ddd393e
commit 7e94b090fe
30 changed files with 1207 additions and 181 deletions
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28
Kernel/CMakeLists.txt
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@ -130,6 +130,7 @@ set(KERNEL_SOURCES
KLexicalPath.cpp
KString.cpp
KSyms.cpp
MiniStdLib.cpp
Mutex.cpp
Net/E1000ENetworkAdapter.cpp
Net/E1000NetworkAdapter.cpp
@ -289,8 +290,6 @@ set(KERNEL_SOURCES
set(KERNEL_SOURCES
${KERNEL_SOURCES}
${CMAKE_CURRENT_SOURCE_DIR}/Arch/x86/common/ASM_wrapper.cpp
${CMAKE_CURRENT_SOURCE_DIR}/Arch/x86/common/Boot/boot.S
${CMAKE_CURRENT_SOURCE_DIR}/Arch/x86/common/Boot/multiboot.S
${CMAKE_CURRENT_SOURCE_DIR}/Arch/x86/common/CPU.cpp
${CMAKE_CURRENT_SOURCE_DIR}/Arch/x86/common/Interrupts.cpp
${CMAKE_CURRENT_SOURCE_DIR}/Arch/x86/common/Processor.cpp
@ -378,8 +377,6 @@ add_compile_definitions(KERNEL)
# It's needed because CLion doesn't understand the way we switch compilers mid-build.
add_compile_definitions(__serenity__)
add_link_options(LINKER:-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld -nostdlib)
add_library(kernel_heap STATIC ${KERNEL_HEAP_SOURCES})
if (${CMAKE_HOST_SYSTEM_NAME} MATCHES SerenityOS)
@ -394,28 +391,22 @@ else()
link_directories(${TOOLCHAIN_ROOT}/lib/gcc/${SERENITY_ARCH}-pc-serenity/${GCC_VERSION}/)
endif()
if ("${SERENITY_ARCH}" STREQUAL "i686")
set(KERNEL_TARGET Kernel32)
else()
set(KERNEL_TARGET Kernel64)
endif()
add_executable(Kernel ${SOURCES})
add_dependencies(Kernel generate_EscapeSequenceStateMachine.h)
add_executable(${KERNEL_TARGET} ${SOURCES})
add_dependencies(${KERNEL_TARGET} generate_EscapeSequenceStateMachine.h)
set_target_properties(${KERNEL_TARGET} PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
target_link_options(Kernel PRIVATE LINKER:-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld -nostdlib)
set_target_properties(Kernel PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
if (ENABLE_KERNEL_LTO)
include(CheckIPOSupported)
check_ipo_supported()
set_property(TARGET ${KERNEL_TARGET} PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
set_property(TARGET Kernel PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()
target_link_libraries(${KERNEL_TARGET} kernel_heap gcc)
add_dependencies(${KERNEL_TARGET} kernel_heap)
target_link_libraries(Kernel kernel_heap gcc)
add_dependencies(Kernel kernel_heap)
add_custom_command(
TARGET ${KERNEL_TARGET} POST_BUILD
COMMAND ${CMAKE_OBJCOPY} -O elf32-i386 ${CMAKE_CURRENT_BINARY_DIR}/${KERNEL_TARGET} ${CMAKE_CURRENT_BINARY_DIR}/Kernel
TARGET Kernel POST_BUILD
COMMAND sh ${CMAKE_CURRENT_SOURCE_DIR}/mkmap.sh
COMMAND ${CMAKE_COMMAND} -E env OBJCOPY=${CMAKE_OBJCOPY} sh ${CMAKE_CURRENT_SOURCE_DIR}/embedmap.sh
COMMAND ${CMAKE_OBJCOPY} --only-keep-debug Kernel Kernel.debug
@ -431,4 +422,5 @@ install(FILES "${CMAKE_CURRENT_BINARY_DIR}/kernel.map" DESTINATION res)
serenity_install_headers(Kernel)
serenity_install_sources(Kernel)
add_subdirectory(Prekernel)
add_subdirectory(Modules)