wip: bare bones for C in kernel
This commit is contained in:
karina
+30
-169
@@ -1,182 +1,43 @@
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cmake_minimum_required(VERSION 3.20)
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project(ksOSKernel LANGUAGES ASM C)
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set(KERNEL_MODULE_NAME "Kernel")
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# Where to emit compile_commands.json for SourceKit-LSP. Empty: Kernel/
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# (ancestor of SWIFT_SOURCES). Override: -DKERNEL_COMPILE_COMMANDS_DIR=/path
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# or env KERNEL_COMPILE_COMMANDS_DIR.
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set(KERNEL_COMPILE_COMMANDS_DIR "" CACHE PATH
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"Directory for Swift compile_commands.json (SourceKit-LSP)")
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file(GLOB_RECURSE KERNEL_SOURCES CMAKE_CONFIGURE_DEPENDS
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${CMAKE_CURRENT_SOURCE_DIR}/Source/KernelMain.c
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${CMAKE_CURRENT_SOURCE_DIR}/Source/Arch/entry.S
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${CMAKE_CURRENT_SOURCE_DIR}/Source/**/*.c
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)
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# --- Locate Swift toolchain with Embedded Swift stdlib ---
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# Priority: cmake var > env var > auto-detect
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if(NOT SWIFT_TOOLCHAIN AND DEFINED ENV{SWIFT_TOOLCHAIN})
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set(SWIFT_TOOLCHAIN "$ENV{SWIFT_TOOLCHAIN}")
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endif()
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add_executable(Kernel ${KERNEL_SOURCES})
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target_include_directories(Kernel PRIVATE
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${CMAKE_CURRENT_SOURCE_DIR}/Include/
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${CMAKE_CURRENT_SOURCE_DIR}/../Common
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)
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if(SWIFT_TOOLCHAIN)
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set(SWIFTC "${SWIFT_TOOLCHAIN}/usr/bin/swiftc")
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set(SWIFT_RESOURCE_DIR "${SWIFT_TOOLCHAIN}/usr/lib/swift")
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elseif(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
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# Scan for a swift.org toolchain that ships the embedded stdlib.
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# APPLE is false here (target is Generic), so we check the HOST OS.
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file(GLOB _tc_candidates
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"$ENV{HOME}/Library/Developer/Toolchains/*.xctoolchain"
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"/Library/Developer/Toolchains/*.xctoolchain"
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)
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foreach(_tc ${_tc_candidates})
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if(EXISTS "${_tc}/usr/lib/swift/embedded")
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set(SWIFTC "${_tc}/usr/bin/swiftc")
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set(SWIFT_RESOURCE_DIR "${_tc}/usr/lib/swift")
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break()
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endif()
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endforeach()
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else()
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# Linux: find swiftc in PATH
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find_program(_SWIFTC_EXE swiftc)
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if(_SWIFTC_EXE)
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get_filename_component(_SWIFTC_BIN "${_SWIFTC_EXE}" DIRECTORY)
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get_filename_component(_SWIFTC_USR "${_SWIFTC_BIN}" DIRECTORY)
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if(EXISTS "${_SWIFTC_USR}/lib/swift/embedded")
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set(SWIFTC "${_SWIFTC_EXE}")
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set(SWIFT_RESOURCE_DIR "${_SWIFTC_USR}/lib/swift")
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elseif(EXISTS "${_SWIFTC_USR}/lib/swift/lib/swift/embedded")
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set(SWIFTC "${_SWIFTC_EXE}")
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set(SWIFT_RESOURCE_DIR "${_SWIFTC_USR}/lib/swift/lib/swift")
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endif()
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endif()
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endif()
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target_compile_options(Kernel PRIVATE
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$<$<COMPILE_LANGUAGE:C>:
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-ffreestanding
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-fno-stack-protector
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-fno-builtin
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-Wall -Wextra
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-g
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-mgeneral-regs-only
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>
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)
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if(NOT SWIFTC OR NOT EXISTS "${SWIFT_RESOURCE_DIR}/embedded")
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message(FATAL_ERROR
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"Swift toolchain with Embedded Swift not found.\n"
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"Install a swift.org toolchain and pass -DSWIFT_TOOLCHAIN=<root> "
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"or set the SWIFT_TOOLCHAIN env var.")
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endif()
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message(STATUS "Swift: ${SWIFTC}")
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message(STATUS "Swift resource dir: ${SWIFT_RESOURCE_DIR}")
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# Hint for SourceKit: VSCode must use this toolchain (same as compile_commands),
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# not Xcode's default; otherwise: "Loading the standard library failed" with Embedded.
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get_filename_component(_SWIFT_IDE_PATH "${SWIFTC}" DIRECTORY)
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set(_ide_hint
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"# If SourceKit reports \"Loading the standard library failed\", set the Swift
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# extension's swift.path to the directory on the line below and restart
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# \"Swift: Restart SourceKit LSP\". (Embedded Swift — must match this toolchain, not Xcode.)
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# Regenerated on each CMake configure.
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")
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string(APPEND _ide_hint "${_SWIFT_IDE_PATH}\n")
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file(WRITE "${CMAKE_CURRENT_SOURCE_DIR}/../ide-swift-toolchain.txt" "${_ide_hint}")
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# --- Build ---
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add_compile_options(-ffreestanding -nostdlib -O0 -g)
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set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
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add_link_options(
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-fuse-ld=lld
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target_link_options(Kernel PRIVATE
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-nostdlib
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-static
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-Wl,-T,${LINKER_SCRIPT}
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-no-pie
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-T "${CMAKE_CURRENT_SOURCE_DIR}/linker.ld"
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-z max-page-size=0x1000
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)
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set(SWIFT_SOURCES
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${CMAKE_CURRENT_SOURCE_DIR}/Source/Kernel.swift
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${CMAKE_CURRENT_SOURCE_DIR}/Source/Arch/DTB.swift
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${CMAKE_CURRENT_SOURCE_DIR}/Source/IO/UART.swift
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${CMAKE_CURRENT_SOURCE_DIR}/Source/Arch/ExceptionContext.swift
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${CMAKE_CURRENT_SOURCE_DIR}/Source/OS/panic.swift # idfk why but sourcekit-lsp dont see Panic.swift but see panic.swift perfectly
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)
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set(SWIFT_OBJ ${CMAKE_CURRENT_BINARY_DIR}/kernel_swift.o)
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add_custom_command(
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OUTPUT ${SWIFT_OBJ}
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COMMAND ${SWIFTC}
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-target aarch64-none-none-elf
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-enable-experimental-feature Embedded
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-parse-as-library
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-wmo
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-O
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-Xcc -fno-stack-protector
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-Xcc -I${CMAKE_CURRENT_SOURCE_DIR}/../Common
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-import-bridging-header ${CMAKE_CURRENT_SOURCE_DIR}/Source/Support/BridgingHeader.h
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-resource-dir ${SWIFT_RESOURCE_DIR}
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-c ${SWIFT_SOURCES}
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-o ${SWIFT_OBJ}
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COMMAND ${LLVM_OBJCOPY} --remove-section=.swift_modhash ${SWIFT_OBJ}
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DEPENDS ${SWIFT_SOURCES}
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COMMENT "Compiling Swift kernel"
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set_target_properties(Kernel PROPERTIES
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OUTPUT_NAME "Kernel.elf"
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RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}"
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)
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set_source_files_properties(${SWIFT_OBJ} PROPERTIES
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EXTERNAL_OBJECT TRUE
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GENERATED TRUE
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)
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add_executable(kernel.elf Source/Arch/entry.S Source/Support/stubs.c Source/Arch/vectors.S ${SWIFT_OBJ})
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add_custom_command(TARGET kernel.elf POST_BUILD
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COMMAND ${LLVM_OBJCOPY} -O binary kernel.elf kernel.bin
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)
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# --- SourceKit-LSP: generate compile_commands.json for Swift (Dynamic) ---
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set(_BRIDGING_HEADER "${CMAKE_CURRENT_SOURCE_DIR}/Source/Support/BridgingHeader.h")
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set(SWIFT_ARGS
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"\"${SWIFTC}\""
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"\"-target\"" "\"aarch64-none-none-elf\""
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"\"-enable-experimental-feature\"" "\"Embedded\""
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"\"-module-name\"" "\"${KERNEL_MODULE_NAME}\""
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"\"-parse-as-library\""
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"\"-wmo\""
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"\"-import-bridging-header\"" "\"${_BRIDGING_HEADER}\""
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"\"-Xcc\"" "\"-I${CMAKE_CURRENT_SOURCE_DIR}/../Common\""
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"\"-Xcc\"" "\"-fno-stack-protector\""
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"\"-resource-dir\"" "\"${SWIFT_RESOURCE_DIR}\""
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)
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foreach(_src IN LISTS SWIFT_SOURCES)
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list(APPEND SWIFT_ARGS "\"${_src}\"")
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endforeach()
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string(JOIN ", " SWIFT_ARGS_JSON ${SWIFT_ARGS})
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set(COMPDB_ENTRIES "")
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list(LENGTH SWIFT_SOURCES _src_count)
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math(EXPR _last_idx "${_src_count} - 1")
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set(_idx 0)
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foreach(_src IN LISTS SWIFT_SOURCES)
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set(_entry " {\n \"file\": \"${_src}\",\n \"directory\": \"${CMAKE_CURRENT_BINARY_DIR}\",\n \"arguments\": [${SWIFT_ARGS_JSON}]\n }")
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if(_idx LESS _last_idx)
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string(APPEND _entry ",\n")
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else()
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string(APPEND _entry "\n")
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endif()
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string(APPEND COMPDB_ENTRIES "${_entry}")
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math(EXPR _idx "${_idx} + 1")
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endforeach()
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# Precedence: CMake -D > env > Kernel/ (ancestor of all SWIFT_SOURCES).
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if(NOT KERNEL_COMPILE_COMMANDS_DIR STREQUAL "")
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set(COMPDB_OUTPUT_DIR "${KERNEL_COMPILE_COMMANDS_DIR}")
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elseif(DEFINED ENV{KERNEL_COMPILE_COMMANDS_DIR} AND NOT "$ENV{KERNEL_COMPILE_COMMANDS_DIR}" STREQUAL "")
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set(COMPDB_OUTPUT_DIR "$ENV{KERNEL_COMPILE_COMMANDS_DIR}")
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else()
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set(COMPDB_OUTPUT_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
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endif()
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# Same JSON twice: (1) optional Kernel/ or KERNEL_COMPILE_COMMANDS_DIR, (2) repo
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# root. SourceKit/Cursor/VSCode Swift extension resolve compile_commands at the
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# workspace root first; a DB only under Kernel/ often yields no language service
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# and broken cross-file resolution (WMO) even though the build works.
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set(KERNEL_COMPDB_CONTENT "[\n${COMPDB_ENTRIES}]\n")
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file(GENERATE OUTPUT "${COMPDB_OUTPUT_DIR}/compile_commands.json"
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CONTENT "${KERNEL_COMPDB_CONTENT}"
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)
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set(_REPO_COMPDB "${CMAKE_CURRENT_SOURCE_DIR}/../compile_commands.json")
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file(GENERATE OUTPUT "${_REPO_COMPDB}"
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CONTENT "${KERNEL_COMPDB_CONTENT}"
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add_custom_command(TARGET Kernel POST_BUILD
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COMMAND ${LLVM_OBJCOPY} -O binary ${CMAKE_BINARY_DIR}/Kernel.elf ${CMAKE_BINARY_DIR}/Kernel.bin
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COMMENT "Generating ksOSKernel.bin from Kernel.elf"
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)
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