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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/Prekernel/CMakeLists.txt Normal file
View file

@ -0,0 +1,28 @@
set(SOURCES
boot.S
multiboot.S
init.cpp
UBSanitizer.cpp
../MiniStdLib.cpp
)
if ("${SERENITY_ARCH}" STREQUAL "i686")
set(PREKERNEL_TARGET Prekernel32)
else()
set(PREKERNEL_TARGET Prekernel64)
endif()
add_executable(${PREKERNEL_TARGET} ${SOURCES})
target_link_options(${PREKERNEL_TARGET} PRIVATE LINKER:-T ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld -nostdlib)
set_target_properties(${PREKERNEL_TARGET} PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
target_link_libraries(${PREKERNEL_TARGET} gcc supc++)
add_custom_command(
TARGET ${PREKERNEL_TARGET} POST_BUILD
COMMAND ${TOOLCHAIN_PREFIX}objcopy -O elf32-i386 ${CMAKE_CURRENT_BINARY_DIR}/${PREKERNEL_TARGET} ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/Prekernel
)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/Prekernel" DESTINATION boot)