## SPDX-License-Identifier: MIT OR Apache-2.0

##

## Copyright (c) 2018-2023 Andre Richter <andre.o.richter@gmail.com>

include ../common/docker.mk

include ../common/format.mk

include ../common/operating_system.mk

##--------------------------------------------------------------------------------------------------

## Optional, user-provided configuration values

##--------------------------------------------------------------------------------------------------

# Default to the RPi3.

BSP ?= rpi3

##--------------------------------------------------------------------------------------------------

## BSP-specific configuration values

##--------------------------------------------------------------------------------------------------

QEMU_MISSING_STRING = "This board is not yet supported for QEMU."

ifeq ($(BSP),rpi3)

TARGET = aarch64-unknown-none-softfloat

KERNEL_BIN = kernel8.img

QEMU_BINARY = qemu-system-aarch64

QEMU_MACHINE_TYPE = raspi3

QEMU_RELEASE_ARGS = -d in_asm -display none

OBJDUMP_BINARY = aarch64-none-elf-objdump

NM_BINARY = aarch64-none-elf-nm

READELF_BINARY = aarch64-none-elf-readelf

LD_SCRIPT_PATH = $(shell pwd)/src/bsp/raspberrypi

RUSTC_MISC_ARGS = -C target-cpu=cortex-a53

else ifeq ($(BSP),rpi4)

TARGET = aarch64-unknown-none-softfloat

KERNEL_BIN = kernel8.img

QEMU_BINARY = qemu-system-aarch64

QEMU_MACHINE_TYPE =

QEMU_RELEASE_ARGS = -d in_asm -display none

OBJDUMP_BINARY = aarch64-none-elf-objdump

NM_BINARY = aarch64-none-elf-nm

READELF_BINARY = aarch64-none-elf-readelf

LD_SCRIPT_PATH = $(shell pwd)/src/bsp/raspberrypi

RUSTC_MISC_ARGS = -C target-cpu=cortex-a72

endif

# Export for build.rs.

export LD_SCRIPT_PATH

##--------------------------------------------------------------------------------------------------

## Targets and Prerequisites

##--------------------------------------------------------------------------------------------------

KERNEL_MANIFEST = Cargo.toml

KERNEL_LINKER_SCRIPT = kernel.ld

LAST_BUILD_CONFIG = target/$(BSP).build_config

KERNEL_ELF = target/$(TARGET)/release/kernel

# This parses cargo's dep-info file.

# https://doc.rust-lang.org/cargo/guide/build-cache.html#dep-info-files

KERNEL_ELF_DEPS = $(filter-out %: ,$(file < $(KERNEL_ELF).d)) $(KERNEL_MANIFEST) $(LAST_BUILD_CONFIG)

##--------------------------------------------------------------------------------------------------

## Command building blocks

##--------------------------------------------------------------------------------------------------

RUSTFLAGS = $(RUSTC_MISC_ARGS) \

-C link-arg=--library-path=$(LD_SCRIPT_PATH) \

-C link-arg=--script=$(KERNEL_LINKER_SCRIPT)

RUSTFLAGS_PEDANTIC = $(RUSTFLAGS) \

-D warnings \

-D missing_docs

FEATURES = --features bsp_$(BSP)

COMPILER_ARGS = --target=$(TARGET) \

$(FEATURES) \

--release

RUSTC_CMD = cargo rustc $(COMPILER_ARGS)

DOC_CMD = cargo doc $(COMPILER_ARGS)

CLIPPY_CMD = cargo clippy $(COMPILER_ARGS)

OBJCOPY_CMD = rust-objcopy \

--strip-all \

-O binary

EXEC_QEMU = $(QEMU_BINARY) -M $(QEMU_MACHINE_TYPE)

##------------------------------------------------------------------------------

## Dockerization

##------------------------------------------------------------------------------

DOCKER_CMD = docker run -t --rm -v $(shell pwd):/work/tutorial -w /work/tutorial

DOCKER_CMD_INTERACT = $(DOCKER_CMD) -i

# DOCKER_IMAGE defined in include file (see top of this file).

DOCKER_QEMU = $(DOCKER_CMD_INTERACT) $(DOCKER_IMAGE)

DOCKER_TOOLS = $(DOCKER_CMD) $(DOCKER_IMAGE)

##--------------------------------------------------------------------------------------------------

## Targets

##--------------------------------------------------------------------------------------------------

.PHONY: all doc qemu clippy clean readelf objdump nm check

all: $(KERNEL_BIN)

##------------------------------------------------------------------------------

## Save the configuration as a file, so make understands if it changed.

##------------------------------------------------------------------------------

$(LAST_BUILD_CONFIG):

@rm -f target/*.build_config

@mkdir -p target

@touch $(LAST_BUILD_CONFIG)

##------------------------------------------------------------------------------

## Compile the kernel ELF

##------------------------------------------------------------------------------

$(KERNEL_ELF): $(KERNEL_ELF_DEPS)

$(call color_header, "Compiling kernel ELF - $(BSP)")

@RUSTFLAGS="$(RUSTFLAGS_PEDANTIC)" $(RUSTC_CMD)

##------------------------------------------------------------------------------

## Generate the stripped kernel binary

##------------------------------------------------------------------------------

$(KERNEL_BIN): $(KERNEL_ELF)

$(call color_header, "Generating stripped binary")

@$(OBJCOPY_CMD) $(KERNEL_ELF) $(KERNEL_BIN)

$(call color_progress_prefix, "Name")

@echo $(KERNEL_BIN)

$(call color_progress_prefix, "Size")

$(call disk_usage_KiB, $(KERNEL_BIN))

##------------------------------------------------------------------------------

## Generate the documentation

##------------------------------------------------------------------------------

doc:

$(call color_header, "Generating docs")

@$(DOC_CMD) --document-private-items --open

##------------------------------------------------------------------------------

## Run the kernel in QEMU

##------------------------------------------------------------------------------

ifeq ($(QEMU_MACHINE_TYPE),) # QEMU is not supported for the board.

qemu:

$(call color_header, "$(QEMU_MISSING_STRING)")

else # QEMU is supported.

qemu: $(KERNEL_BIN)

$(call color_header, "Launching QEMU")

@$(DOCKER_QEMU) $(EXEC_QEMU) $(QEMU_RELEASE_ARGS) -kernel $(KERNEL_BIN)

endif

##------------------------------------------------------------------------------

## Run clippy

##------------------------------------------------------------------------------

clippy:

@RUSTFLAGS="$(RUSTFLAGS_PEDANTIC)" $(CLIPPY_CMD)

##------------------------------------------------------------------------------

## Clean

##------------------------------------------------------------------------------

clean:

rm -rf target $(KERNEL_BIN)

##------------------------------------------------------------------------------

## Run readelf

##------------------------------------------------------------------------------

readelf: $(KERNEL_ELF)

$(call color_header, "Launching readelf")

@$(DOCKER_TOOLS) $(READELF_BINARY) --headers $(KERNEL_ELF)

##------------------------------------------------------------------------------

## Run objdump

##------------------------------------------------------------------------------

objdump: $(KERNEL_ELF)

$(call color_header, "Launching objdump")

@$(DOCKER_TOOLS) $(OBJDUMP_BINARY) --disassemble --demangle \

--section .text \

$(KERNEL_ELF) | rustfilt

##------------------------------------------------------------------------------

## Run nm

##------------------------------------------------------------------------------

nm: $(KERNEL_ELF)

$(call color_header, "Launching nm")

@$(DOCKER_TOOLS) $(NM_BINARY) --demangle --print-size $(KERNEL_ELF) | sort | rustfilt