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‎Makefile

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include build_scripts/config.mk
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.PHONY: all floppy_image kernel bootloader clean always tools_fat
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all: floppy_image tools_fat
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include build_scripts/toolchain.mk
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# Floppy image
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floppy_image: $(BUILD_DIR)/main_floppy.img
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$(BUILD_DIR)/main_floppy.img: bootloader kernel
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@dd if=/dev/zero of=$@ bs=512 count=2880 >/dev/null
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@mkfs.fat -F 12 -n "NBOS" $@ >/dev/null
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@dd if=$(BUILD_DIR)/stage1.bin of=$@ conv=notrunc >/dev/null
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@mcopy -i $@ $(BUILD_DIR)/stage2.bin "::stage2.bin"
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@mcopy -i $@ $(BUILD_DIR)/kernel.bin "::kernel.bin"
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@mmd -i $@ "::mydir"
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@echo "--> Created: " $@
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# Bootloader
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bootloader: stage1 stage2
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stage1: $(BUILD_DIR)/stage1.bin
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$(BUILD_DIR)/stage1.bin: always
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@$(MAKE) -C src/bootloader/stage1 BUILD_DIR=$(abspath $(BUILD_DIR))
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stage2: $(BUILD_DIR)/stage2.bin
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$(BUILD_DIR)/stage2.bin: always
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@$(MAKE) -C src/bootloader/stage2 BUILD_DIR=$(abspath $(BUILD_DIR))
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# Kernel
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kernel: $(BUILD_DIR)/kernel.bin
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$(BUILD_DIR)/kernel.bin: always
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@$(MAKE) -C src/kernel BUILD_DIR=$(abspath $(BUILD_DIR))
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# Tools
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tools_fat: $(BUILD_DIR)/tools/fat
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$(BUILD_DIR)/tools/fat: always tools/fat/fat.c
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@mkdir -p $(BUILD_DIR)/tools
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@$(MAKE) -C tools/fat BUILD_DIR=$(abspath $(BUILD_DIR))
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# Always
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always:
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@mkdir -p $(BUILD_DIR)
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# Clean
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clean:
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@$(MAKE) -C src/bootloader/stage1 BUILD_DIR=$(abspath $(BUILD_DIR)) clean
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@$(MAKE) -C src/bootloader/stage2 BUILD_DIR=$(abspath $(BUILD_DIR)) clean
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@$(MAKE) -C src/kernel BUILD_DIR=$(abspath $(BUILD_DIR)) clean
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@rm -rf $(BUILD_DIR)/*

‎bochs_config

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megs: 128
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romimage: file=/home/tibi/Downloads/bochs-2.7.pre1/bios/BIOS-bochs-latest
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vgaromimage: file=/home/tibi/Downloads/bochs-2.7.pre1/bios/VGABIOS-elpin-2.40
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floppya: 1_44=build/main_floppy.img, status=inserted
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boot: floppy
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mouse: enabled=0
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display_library: wx, options="gui_debug"

‎build_scripts/config.mk

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export CFLAGS = -std=c99 -g
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export ASMFLAGS =
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export CC = gcc
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export CXX = g++
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export LD = gcc
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export ASM = nasm
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export LINKFLAGS =
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export LIBS =
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export TARGET = i686-elf
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export TARGET_ASM = nasm
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export TARGET_ASMFLAGS =
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export TARGET_CFLAGS = -std=c99 -g #-O2
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export TARGET_CC = $(TARGET)-gcc
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export TARGET_CXX = $(TARGET)-g++
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export TARGET_LD = $(TARGET)-gcc
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export TARGET_LINKFLAGS =
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export TARGET_LIBS =
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export BUILD_DIR = $(abspath build)
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BINUTILS_VERSION = 2.39
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BINUTILS_URL = https://ftp.gnu.org/gnu/binutils/binutils-$(BINUTILS_VERSION).tar.xz
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GCC_VERSION = 11.2.0
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GCC_URL = https://ftp.gnu.org/gnu/gcc/gcc-$(GCC_VERSION)/gcc-$(GCC_VERSION).tar.xz

‎build_scripts/generate_isrs.sh

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#!/usr/bin/bash
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# exit on error
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set -e
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# print usage
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if [ $# -le 1 ]; then
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echo "Usage: generate_isrs.sh <isrs_gen.c> <isrs_gen.inc>"
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exit 1
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fi
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# vars
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ISRS_GEN_C=$1
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ISRS_GEN_ASM=$2
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ISRS_WITH_ERROR_CODE="8 10 11 12 13 14 17 21"
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#
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# Generate C file
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#
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echo "// !!! THIS FILE IS AUTOGENERATED !!!" > $ISRS_GEN_C
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echo "#include \"idt.h\"" >> $ISRS_GEN_C
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echo "#include \"gdt.h\"" >> $ISRS_GEN_C
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echo "" >> $ISRS_GEN_C
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for i in $(seq 0 255); do
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echo "void __attribute((cdecl)) i686_ISR${i}();" >> $ISRS_GEN_C
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done
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echo "" >> $ISRS_GEN_C
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echo "void i686_ISR_InitializeGates()" >> $ISRS_GEN_C
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echo "{" >> $ISRS_GEN_C
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for i in $(seq 0 255); do
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echo " i686_IDT_SetGate(${i}, i686_ISR${i}, i686_GDT_CODE_SEGMENT, IDT_FLAG_RING0 | IDT_FLAG_GATE_32BIT_INT);" >> $ISRS_GEN_C
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done
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echo "}" >> $ISRS_GEN_C
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#
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# Generate assembly file
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#
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echo "; !!! THIS FILE IS AUTOGENERATED !!!" > $ISRS_GEN_ASM
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for i in $(seq 0 255); do
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if echo "$ISRS_WITH_ERROR_CODE" | grep -q "\b${i}\b"; then
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echo "ISR_ERRORCODE ${i}" >> $ISRS_GEN_ASM
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else
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echo "ISR_NOERRORCODE ${i}" >> $ISRS_GEN_ASM
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fi
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done

‎build_scripts/toolchain.mk

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TOOLCHAIN_PREFIX = $(abspath toolchain/$(TARGET))
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export PATH := $(TOOLCHAIN_PREFIX)/bin:$(PATH)
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toolchain: toolchain_binutils toolchain_gcc
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BINUTILS_SRC = toolchain/binutils-$(BINUTILS_VERSION)
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BINUTILS_BUILD = toolchain/binutils-build-$(BINUTILS_VERSION)
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toolchain_binutils: $(TOOLCHAIN_PREFIX)/bin/i686-elf-ld
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$(TOOLCHAIN_PREFIX)/bin/i686-elf-ld: $(BINUTILS_SRC).tar.xz
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cd toolchain && tar -xf binutils-$(BINUTILS_VERSION).tar.xz
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mkdir $(BINUTILS_BUILD)
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cd $(BINUTILS_BUILD) && CFLAGS= ASMFLAGS= CC= CXX= LD= ASM= LINKFLAGS= LIBS= ../binutils-$(BINUTILS_VERSION)/configure \
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--prefix="$(TOOLCHAIN_PREFIX)" \
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--target=$(TARGET) \
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--with-sysroot \
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--disable-nls \
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--disable-werror
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$(MAKE) -j8 -C $(BINUTILS_BUILD)
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$(MAKE) -C $(BINUTILS_BUILD) install
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$(BINUTILS_SRC).tar.xz:
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mkdir -p toolchain
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cd toolchain && wget $(BINUTILS_URL)
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GCC_SRC = toolchain/gcc-$(GCC_VERSION)
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GCC_BUILD = toolchain/gcc-build-$(GCC_VERSION)
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toolchain_gcc: $(TOOLCHAIN_PREFIX)/bin/i686-elf-gcc
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$(TOOLCHAIN_PREFIX)/bin/i686-elf-gcc: $(TOOLCHAIN_PREFIX)/bin/i686-elf-ld $(GCC_SRC).tar.xz
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cd toolchain && tar -xf gcc-$(GCC_VERSION).tar.xz
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mkdir $(GCC_BUILD)
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cd $(GCC_BUILD) && CFLAGS= ASMFLAGS= CC= CXX= LD= ASM= LINKFLAGS= LIBS= ../gcc-$(GCC_VERSION)/configure \
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--prefix="$(TOOLCHAIN_PREFIX)" \
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--target=$(TARGET) \
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--disable-nls \
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--enable-languages=c,c++ \
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--without-headers
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$(MAKE) -j8 -C $(GCC_BUILD) all-gcc all-target-libgcc
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$(MAKE) -C $(GCC_BUILD) install-gcc install-target-libgcc
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$(GCC_SRC).tar.xz:
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mkdir -p toolchain
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cd toolchain && wget $(GCC_URL)
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#
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# Clean
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#
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clean-toolchain:
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rm -rf $(GCC_BUILD) $(GCC_SRC) $(BINUTILS_BUILD) $(BINUTILS_SRC)
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clean-toolchain-all:
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rm -rf toolchain/*
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.PHONY: toolchain toolchain_binutils toolchain_gcc clean-toolchain clean-toolchain-all

‎run.sh

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qemu-system-i386 -fda build/main_floppy.img

‎src/bootloader/stage1/Makefile

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BUILD_DIR?=build/
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ASM?=nasm
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.PHONY: all clean
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all: stage1
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stage1: $(BUILD_DIR)/stage1.bin
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$(BUILD_DIR)/stage1.bin: boot.asm
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@$(ASM) $< -f bin -o $@
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@echo "--> Created stage1.bin"
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clean:
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@rm -f $(BUILD_DIR)/stage1.bin

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