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#!/bin/sh
set -xe
function run
{
# 32 bit does NOT work, even if the kernel is obviously compiled
# for 32 bit, the binary could be broken, but I didn't manage to
# build qemu from source,
# pretty sure that riscv32-unknown-linux-gnu- works fine
qemu-system-riscv64 \
-machine virt \
-kernel "$BIN/$KERNEL" \
-initrd "$BIN/$INITFS" \
-append "console=ttyS0" -nographic \
-monitor none \
-serial stdio
}
function initramfs
{
IMG="$(pwd)/$BIN/$INITFS"
DIR="${IMG%.*}"
mkdir -p $DIR
# copy the program
cp $1 "$DIR/init"
# make image and delete folder
(cd $DIR; find . | cpio -H newc -o | gzip > $IMG)
rm -rf $DIR
}
function kernel
{
DIR="${KERNEL%.*}"
ARCHIVE="$DIR.tar.xz"
BACKUP="backup"
mkdir -p $BACKUP
if [[ -n $(find backup/ -type f -name "$KERNEL") ]]; then
cp $BACKUP/$KERNEL $BIN/
exit 0
fi
if [[ -n $(find backup/ -type f -name "$ARCHIVE") ]]; then
cp $BACKUP/$ARCHIVE $BIN/
else
wget -P $BIN https://cdn.kernel.org/pub/linux/kernel/v5.x/$ARCHIVE
cp $BIN/$ARCHIVE $BACKUP/
fi
tar -xf $BIN/$ARCHIVE -C $BIN/
rm $BIN/$ARCHIVE
# TOOLCHAIN in the Makefile
cd $BIN/$DIR
make ARCH=riscv CROSS_COMPILE=$TOOLCHAIN defconfig
make ARCH=riscv CROSS_COMPILE=$TOOLCHAIN -j $(nproc)
cd ../../
cp $BIN/$DIR/arch/riscv/boot/Image $BIN/$KERNEL
cp $BIN/$KERNEL $BACKUP
rm -rf $BIN/$DIR
}
$1 $2
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