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Kernel/x86: Bake the Prekernel and the Kernel into one image

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The new baked image is a Prekernel and a Kernel baked together now, so
essentially we no longer need to pass the Prekernel as -kernel and the
actual  kernel image as -initrd to QEMU, leaving the option to pass an
actual initrd or initramfs module later on with multiboot.
This commit is contained in:
Liav A 2023-03-24 20:31:53 +03:00 • committed by Jelle Raaijmakers
parent 2a1e58f8cc
commit 897c4e5145
10 changed files with 81 additions and 50 deletions
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27
Kernel/CMakeLists.txt
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@ -720,7 +720,25 @@ elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang$")
target_link_libraries(Kernel PRIVATE kernel_heap clang_rt.builtins)
endif()
add_custom_command(
if ("${SERENITY_ARCH}" STREQUAL "x86_64")
set(KERNEL_ELF_OBJCOPY_TARGET "elf64-x86-64")
endif()
# In x86_64 the Kernel is linked to the Pre-kernel binary.
if ("${SERENITY_ARCH}" STREQUAL "x86_64")
add_custom_command(
TARGET Kernel POST_BUILD
COMMAND ${CMAKE_COMMAND} -E env NM=${CMAKE_NM} 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
COMMAND ${CMAKE_OBJCOPY} --strip-debug Kernel
COMMAND ${CMAKE_OBJCOPY} --add-gnu-debuglink=Kernel.debug Kernel
COMMAND ${CMAKE_OBJCOPY} --set-section-flags .heap=load Kernel Kernel_shared_object
COMMAND ${CMAKE_OBJCOPY} -I binary -O ${KERNEL_ELF_OBJCOPY_TARGET} --rename-section .data=.Kernel_image --set-section-alignment .Kernel_image=4096 Kernel_shared_object Kernel.o
BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/Kernel.o ${CMAKE_CURRENT_BINARY_DIR}/kernel.map
)
elseif ("${SERENITY_ARCH}" STREQUAL "aarch64")
add_custom_command(
TARGET Kernel POST_BUILD
COMMAND "${CMAKE_COMMAND}" -E env NM=${CMAKE_NM} sh ${CMAKE_CURRENT_SOURCE_DIR}/mkmap.sh
COMMAND "${CMAKE_COMMAND}" -E env OBJCOPY=${CMAKE_OBJCOPY} sh ${CMAKE_CURRENT_SOURCE_DIR}/embedmap.sh
@ -728,9 +746,14 @@ add_custom_command(
COMMAND ${CMAKE_OBJCOPY} --strip-debug Kernel
COMMAND ${CMAKE_OBJCOPY} --add-gnu-debuglink=Kernel.debug Kernel
BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/kernel.map
)
)
endif()
# Both architectures (x86_64, aarch64) share the same location in their respective architecture build folder.
# In x86_64 the Kernel is linked to the Pre-kernel binary and then generates the result Kernel binary.
# In aarch64 there's no Pre-kernel stage yet, so we immediately get a Kernel binary.
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/Kernel" DESTINATION boot)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/Kernel.debug" DESTINATION boot)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/kernel.map" DESTINATION res)