add efi shell so that chainloading multiple items can be tested

hack/boot.sh

@@ -22,7 +22,19 @@ set -- "${@}" -smp 2 -m 4096
 if [ "${NO_GRAPHICAL_BOOT}" = "1" ]; then
 	set -- "${@}" -nographic
 else
-	set -- "${@}" -serial stdio -vga none -device "virtio-gpu,edid=on,xres=1024,yres=768"
+	set -- "${@}" \
+		-device virtio-serial-pci,id=vs0 \
+		-chardev stdio,id=stdio0 \
+		-device virtconsole,chardev=stdio0,id=console0
+
+	if [ "${TARGET_ARCH}" = "x86_64" ]; then
+		set -- "${@}" \
+			-vga std
+	else
+		set -- "${@}" \
+			-vga none \
+			-device "virtio-gpu,edid=on,xres=1024,yres=768"
+	fi
 fi
 
 rm -f "${FINAL_DIR}/ovmf-boot.fd"

hack/build.sh

@@ -73,6 +73,7 @@ if [ "${SKIP_VM_BUILD}" != "1" ]; then
 	echo "[vm build] ${TARGET_ARCH} ${RUST_PROFILE}"
 	docker build --platform="${DOCKER_TARGET}" -t "${DOCKER_PREFIX}/sprout-ovmf-${TARGET_ARCH}:${DOCKER_TAG}" -f vm/Dockerfile.ovmf "${FINAL_DIR}"
 	copy_from_image "${DOCKER_PREFIX}/sprout-ovmf-${TARGET_ARCH}" "ovmf.fd" "${FINAL_DIR}/ovmf.fd"
+	copy_from_image "${DOCKER_PREFIX}/sprout-ovmf-${TARGET_ARCH}" "shell.efi" "${FINAL_DIR}/shell.efi"
 fi
 
 if [ "${SKIP_SPROUT_BUILD}" != "1" ]; then
@@ -84,6 +85,9 @@ if [ "${SKIP_SPROUT_BUILD}" != "1" ]; then
 	if [ -f "${FINAL_DIR}/kernel.efi" ]; then
 		cp "${FINAL_DIR}/kernel.efi" "${FINAL_DIR}/efi/EFI/BOOT/KERNEL.EFI"
 	fi
+	if [ -f "${FINAL_DIR}/shell.efi" ]; then
+		cp "${FINAL_DIR}/shell.efi" "${FINAL_DIR}/efi/EFI/BOOT/SHELL.EFI"
+	fi
 	cp "hack/configs/kernel.sprout.toml" "${FINAL_DIR}/efi/SPROUT.TOML"
 fi
 

hack/configs/kernel.sprout.toml

@@ -1,2 +1,5 @@
 [[modules]]
-chainloader = { path = "\\EFI\\BOOT\\KERNEL.EFI" }
+chainloader = { path = "\\EFI\\BOOT\\SHELL.EFI" }
+
+[[modules]]
+chainloader = { path = "\\EFI\\BOOT\\KERNEL.EFI", options = ["tty=hvc0"] }