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#!/usr/bin/env bash
set -e
# Enfore BUSYBOX_SRC and QEMU_KERNEL.
if [ -z "$BUSYBOX_SRC" ]; then
echo "run-riscv-qemu (error): you need to define BUSYBOX_SRC."
exit 1
fi
# If the $QEMU_KERNEL environment variable is not explicitely set, then guess
# one based on the current working directory.
if [ -z "$QEMU_KERNEL" ]; then
if [ ! -z "$ARCH" ]; then
if [ -f "arch/$ARCH/boot/Image" ]; then
QEMU_KERNEL=$(realpath "arch/$ARCH/boot/Image")
else
echo "run-riscv-qemu (error): you need to define QEMU_KERNEL with the Image to be used."
exit 1
fi
echo "run-riscv-qemu (info): using '$QEMU_KERNEL' as the Linux kernel Image."
else
echo "run-riscv-qemu (error): you need to define QEMU_KERNEL with the Image to be used."
exit 1
fi
fi
# Configurable variables.
QEMU_CPU=${QEMU_CPU:-max}
QEMU_SMP=${QEMU_SMP:-4}
EXTRA=${EXTRA:-}
# Cleanup older environments.
rm -rf "$BUSYBOX_SRC/initramfs/home"
while [[ $# -gt 0 ]]; do
case $1 in
-g | --gdb)
EXTRA="-s -S"
shift
;;
-h | --help)
SHOW_HELP=1
shift
;;
-*)
echo "run-riscv-qemu (error): unknown option '$1'."
exit 1
;;
*)
mkdir -p "$BUSYBOX_SRC/initramfs/home/$(whoami)"
cp "$1" "$BUSYBOX_SRC/initramfs/home/$(whoami)/"
shift # past argument
;;
esac
done
# Print the show message if needed.
if [ -n "$SHOW_HELP" ]; then
cat <<HERE
usage: run-riscv-qemu.sh [OPTIONS]
Run QEMU/KVM tailored to my needs for testing the Linux Kernel.
-g, --gdb Wait for a GDB connection.
-h, --help Show this message.
Environment variables that can be used the further configure the run:
- EXTRA: extra arguments to pass. Default: (empty).
- QEMU_CPU: CPU model to use (i.e. argument for '-cpu'). Default: 'max'.
- QEMU_SMP: number of cores (i.e. argument for '-smp'). Default: 4.
HERE
exit 0
fi
##
# Generate the initramfs.
pushd "$BUSYBOX_SRC/initramfs"
find . -print0 | cpio --null -o --format=newc | gzip -9 >../initramfs.cpio.gz
popd
##
# Actual run.
set -x
qemu-system-riscv64 -machine virt -nographic \
-cpu "$QEMU_CPU" \
-smp "$QEMU_SMP" \
-kernel "$QEMU_KERNEL" \
-initrd "$BUSYBOX_SRC/initramfs.cpio.gz" \
-append "root=/dev/ram" \
-append nokaslr \
-append ftrace_dump_on_oops \
-append sysctl.kernel.panic_on_rcu_stall=1 \
$EXTRA
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