Create repository

.gitignore

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+**/*.o

Makefile

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+
+
+all:
+	@printf "Usage:\n"
+	@printf "%25s  %s\n" "Compile kernel:" "make kernel"
+
+qemu:
+	make -C src/
+	qemu-system-i386 -kernel src/bringelle
+

src/Makefile

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+EXEC := bringelle
+CC := gcc -c -m32 -fno-pie -fno-builtin
+
+UTILS_SRC := $(wildcard utils/*.c)
+
+all: $(EXEC)
+
+$(EXEC): boot.o utils.o bringelle.o
+	for obj in $^ ;\
+	do \
+		objcopy --remove-section .note.gnu.property $${obj} ; \
+	done
+	ld -Ttext=0x00100000 -melf_i386 -nostdlib --oformat=binary -o bringelle $^ 
+
+bringelle.o: bringelle.c
+	$(CC) $^
+
+utils.o: $(UTILS_SRC)
+	$(CC) $^ -o $@
+
+boot.o: ./boot/boot.S
+	as --32 -o $@ $^ -mx86-used-note=no
+
+clean:
+	- rm $(EXEC)
+	- rm ./*.o
+
+.PHONY: clean
+
+

src/boot/boot.S

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+.extern bringelle
+.globl  _start
+.text
+
+.set MB_MAGIC, 0x1BADB002
+.set MB_FLAGS, 0x00010000
+.set MB_CHECKSUM, -(MB_MAGIC+MB_FLAGS)
+.set MB_HEADER_ADDR, mb_header
+.set MB_LOAD_ADDR, mb_header
+.set MB_LOAD_END_ADDR, 0x0
+.set MB_BSS_END_ADDR, 0x0
+.set MB_ENTRY_ADDR, _start
+
+mb_header:
+.align 4
+.long MB_MAGIC
+.long MB_FLAGS
+.long MB_CHECKSUM
+.long MB_HEADER_ADDR
+.long MB_LOAD_ADDR
+.long MB_LOAD_END_ADDR
+.long MB_BSS_END_ADDR
+.long MB_ENTRY_ADDR
+
+_start:
+    call bringelle
+

src/bringelle.c

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+#include "utils/print.h"
+
+
+
+
+void bringelle(){
+  putchar('L');
+  putchar('L');
+
+  while(1);
+}

src/utils/print.c

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+#include "print.h"
+
+
+void putchar(char c){
+  char *video=(char *)0xB8000;
+  video[0]=c;
+}

src/utils/print.h

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+#ifndef PRINT_H
+#define PRINT_H
+
+
+void putchar(char);
+
+#endif

tools/gen_syslinux_floppy.sh

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+#!/usr/bin/env bash
+
+# Ensure to abort on error
+set -e
+
+wai=$(dirname $(readlink -f "$0")) # Current script directory
+outdir="${wai}/../"
+floppy="${outdir}/floppy.img"
+mountp="$(mktemp -d)" # Mount point (where the floppy will be mounted temporally
+sysbios="/usr/lib/syslinux/bios/" # Syslinux bios and ui locations
+
+check_for () {
+    command -v "$1" &>/dev/null || { echo "Command $1 not found!"; exit 1; }
+}
+
+check_for parted
+check_for losetup
+check_for extlinux
+check_for mkfs.ext4
+[ -d "$sysbios" ] || { echo "Syslinux bios \"$sysbios\" not found!"; exit 1; }
+
+# Create drive
+dd if=/dev/zero of=${floppy} bs=512 count=50000 # Change count to change floppy size :)
+parted -s $floppy mklabel gpt
+parted -s $floppy mkpart linux ext4 0 100%
+parted -s $floppy set 1 legacy_boot on # Require for syslinux according to https://wiki.gentoo.org/wiki/Syslinux#GPT
+
+# Initiate loop devices
+loop=$(sudo losetup -f)
+part="${loop}p1" # Disk partition
+sudo losetup -Pf $floppy
+
+# Prepare disk partition
+sudo mkfs.ext4 $part
+sudo mount $part "$mountp"
+sudo mkdir -p $mountp/boot/syslinux/
+
+# Configuring syslinux
+sudo chown -R loic $mountp/boot/
+cfg=$(mktemp)
+cat > "$cfg" <<EOF
+TIMEOUT 30
+UI vesamenu.c32
+
+MENU TITLE Syslinux
+ LABEL Bringelle
+ KERNEL /boot/bringelle.bs
+EOF
+mv "$cfg" "$mountp/boot/syslinux/syslinux.cfg"
+cp $sysbios/*.c32 $mountp/boot/syslinux/
+sudo extlinux --install $mountp/boot/syslinux
+
+# Umount floppy
+sync
+sudo umount "$mountp"
+rmdir "$mountp"
+
+# Install MBR
+sudo dd bs=440 count=1 conv=notrunc if=$sysbios/gptmbr.bin of=${loop}
+
+# Cleanup
+sudo losetup -D

tools/load_bringelle.sh

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+#!/usr/bin/env bash
+
+# Ensure to abort on error
+set -e
+
+wai=$(dirname $(readlink -f "$0")) # Current script directory
+outdir="${wai}/../"
+floppy="${outdir}/floppy.img"
+mountp="$(mktemp -d)" # Mount point (where the floppy will be mounted temporally
+kernel="${outdir}/src/bringelle"
+
+check_for () {
+    command -v "$1" &>/dev/null || { echo "Command $1 not found!"; exit 1; }
+}
+
+check_for losetup
+[ ! -e "$floppy" ] && { echo "Floppy drive \"$floppy\" not found!"; exit 1; }
+[ ! -e "$kernel" ] && { echo "Kernel \"$kernel\" not found!"; exit 1; }
+
+# Initiate loop devices
+loop=$(sudo losetup -f)
+part="${loop}p1" # Disk partition
+sudo losetup -Pf $floppy
+
+# Prepare disk partition
+sudo mount $part "$mountp"
+cp $kernel $mountp/boot/bringelle.bs
+
+# Umount floppy
+sync
+sudo umount "$mountp"
+rmdir "$mountp"
+
+# Cleanup
+sudo losetup -D
+