From 9a52fa1d1cd1780847e66b3120179c05c693b0b2 Mon Sep 17 00:00:00 2001
From: Alex Zenla <alex@edera.dev>
Date: Sun, 12 Oct 2025 18:54:24 -0700
Subject: [PATCH] add support for xen boot via standard chainload

---
 hack/dev/boot/Dockerfile            |  4 ++++
 hack/dev/build.sh                   | 14 ++++++++++++--
 hack/dev/configs/kernel.sprout.toml | 11 +++++++++--
 hack/dev/configs/xen.cfg            |  7 +++++++
 hack/dev/vm/Dockerfile.xen          |  6 ++++++
 5 files changed, 38 insertions(+), 4 deletions(-)
 create mode 100644 hack/dev/configs/xen.cfg
 create mode 100644 hack/dev/vm/Dockerfile.xen

diff --git a/hack/dev/boot/Dockerfile b/hack/dev/boot/Dockerfile
index aeb4be3..0c0b355 100644
--- a/hack/dev/boot/Dockerfile
+++ b/hack/dev/boot/Dockerfile
@@ -9,6 +9,8 @@ COPY sprout.efi /work/${EFI_NAME}.EFI
 COPY sprout.toml /work/SPROUT.TOML
 COPY kernel.efi /work/KERNEL.EFI
 COPY shell.efi /work/SHELL.EFI
+COPY xen.efi /work/XEN.EFI
+COPY xen.cfg /work/XEN.CFG
 COPY initramfs /work/INITRAMFS
 COPY edera-splash.png /work/EDERA-SPLASH.PNG
 RUN truncate -s128MiB sprout.img && \
@@ -21,6 +23,8 @@ RUN truncate -s128MiB sprout.img && \
     mcopy -i sprout.img ${EFI_NAME}.EFI ::/EFI/BOOT/ && \
     mcopy -i sprout.img KERNEL.EFI ::/EFI/BOOT/ && \
     mcopy -i sprout.img SHELL.EFI ::/EFI/BOOT/ && \
+    mcopy -i sprout.img XEN.EFI ::/EFI/BOOT/ && \
+    mcopy -i sprout.img XEN.CFG ::/EFI/BOOT/ && \
     mcopy -i sprout.img SPROUT.TOML ::/ && \
     mcopy -i sprout.img EDERA-SPLASH.PNG ::/ && \
     mcopy -i sprout.img INITRAMFS ::/ && \
diff --git a/hack/dev/build.sh b/hack/dev/build.sh
index 17ee58d..13bf237 100755
--- a/hack/dev/build.sh
+++ b/hack/dev/build.sh
@@ -68,8 +68,6 @@ if [ "${SKIP_KERNEL_BUILD}" != "1" ]; then
 	fi
 
 	copy_from_image "${DOCKER_PREFIX}/sprout-kernel-${TARGET_ARCH}" "kernel.efi" "${FINAL_DIR}/kernel.efi"
-	cp "hack/dev/configs/${SPROUT_CONFIG_NAME}.sprout.toml" "${FINAL_DIR}/sprout.toml"
-	cp "hack/dev/assets/edera-splash.png" "${FINAL_DIR}/edera-splash.png"
 fi
 
 if [ "${SKIP_VM_BUILD}" != "1" ]; then
@@ -79,6 +77,8 @@ if [ "${SKIP_VM_BUILD}" != "1" ]; then
 	copy_from_image "${DOCKER_PREFIX}/sprout-ovmf-${TARGET_ARCH}" "shell.efi" "${FINAL_DIR}/shell.efi"
 	docker build --platform="${DOCKER_TARGET}" -t "${DOCKER_PREFIX}/sprout-initramfs-${TARGET_ARCH}:${DOCKER_TAG}" -f hack/dev/vm/Dockerfile.initramfs "${FINAL_DIR}"
 	copy_from_image "${DOCKER_PREFIX}/sprout-initramfs-${TARGET_ARCH}" "initramfs" "${FINAL_DIR}/initramfs"
+	docker build --platform="${DOCKER_TARGET}" -t "${DOCKER_PREFIX}/sprout-xen-${TARGET_ARCH}:${DOCKER_TAG}" -f hack/dev/vm/Dockerfile.xen "${FINAL_DIR}"
+	copy_from_image "${DOCKER_PREFIX}/sprout-xen-${TARGET_ARCH}" "xen.efi" "${FINAL_DIR}/xen.efi"
 fi
 
 if [ "${SKIP_SPROUT_BUILD}" != "1" ]; then
@@ -92,6 +92,10 @@ if [ "${SKIP_SPROUT_BUILD}" != "1" ]; then
 		copy_from_image "${DOCKER_PREFIX}/sprout-${TARGET_ARCH}" "sprout.efi" "${FINAL_DIR}/sprout.efi"
 	fi
 
+	cp "hack/dev/configs/${SPROUT_CONFIG_NAME}.sprout.toml" "${FINAL_DIR}/sprout.toml"
+  cp "hack/dev/configs/xen.cfg" "${FINAL_DIR}/xen.cfg"
+  cp "hack/dev/assets/edera-splash.png" "${FINAL_DIR}/edera-splash.png"
+
 	mkdir -p "${FINAL_DIR}/efi/EFI/BOOT"
 	cp "${FINAL_DIR}/sprout.efi" "${FINAL_DIR}/efi/EFI/BOOT/${EFI_NAME}.EFI"
 	if [ -f "${FINAL_DIR}/kernel.efi" ]; then
@@ -100,6 +104,12 @@ if [ "${SKIP_SPROUT_BUILD}" != "1" ]; then
 	if [ -f "${FINAL_DIR}/shell.efi" ]; then
 		cp "${FINAL_DIR}/shell.efi" "${FINAL_DIR}/efi/EFI/BOOT/SHELL.EFI"
 	fi
+	if [ -f "${FINAL_DIR}/xen.efi" ]; then
+  	cp "${FINAL_DIR}/xen.efi" "${FINAL_DIR}/efi/EFI/BOOT/XEN.EFI"
+  fi
+	if [ -f "${FINAL_DIR}/xen.cfg" ]; then
+  	cp "${FINAL_DIR}/xen.cfg" "${FINAL_DIR}/efi/EFI/BOOT/XEN.CFG"
+  fi
 	cp "${FINAL_DIR}/sprout.toml" "${FINAL_DIR}/efi/SPROUT.TOML"
 	cp "${FINAL_DIR}/edera-splash.png" "${FINAL_DIR}/efi/EDERA-SPLASH.PNG"
 	cp "${FINAL_DIR}/initramfs" "${FINAL_DIR}/efi/INITRAMFS"
diff --git a/hack/dev/configs/kernel.sprout.toml b/hack/dev/configs/kernel.sprout.toml
index f7768f8..353efe3 100644
--- a/hack/dev/configs/kernel.sprout.toml
+++ b/hack/dev/configs/kernel.sprout.toml
@@ -17,11 +17,18 @@ chainload.options = ["$default-options"]
 [actions.chainload-shell]
 chainload.path = "\\EFI\\BOOT\\shell.efi"
 
+[actions.chainload-xen]
+chainload.path = "\\EFI\\BOOT\\xen.efi"
+
 [generators.kernels.matrix]
-entry.title = "Boot Kernel $name"
+entry.title = "Boot Linux $name"
 entry.values.path = "\\EFI\\BOOT\\$name"
 entry.actions = ["chainload-kernel"]
 values.name = ["kernel.efi"]
 
+#[entries.xen]
+#title = "Boot Xen"
+#actions = ["chainload-xen"]
+
 [[phases.startup]]
-actions = ["welcome", "splash"]
+actions = ["welcome"]
diff --git a/hack/dev/configs/xen.cfg b/hack/dev/configs/xen.cfg
new file mode 100644
index 0000000..ae0ee4e
--- /dev/null
+++ b/hack/dev/configs/xen.cfg
@@ -0,0 +1,7 @@
+[global]
+default=sprout
+
+[sprout]
+options=console=hvc0
+kernel=\EFI\BOOT\KERNEL.EFI
+ramdisk=\initramfs
diff --git a/hack/dev/vm/Dockerfile.xen b/hack/dev/vm/Dockerfile.xen
new file mode 100644
index 0000000..19d7afd
--- /dev/null
+++ b/hack/dev/vm/Dockerfile.xen
@@ -0,0 +1,6 @@
+FROM alpine:3.22@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1 AS build
+ARG TARGETPLATFORM
+RUN apk add --no-cache xen-hypervisor && cp /usr/lib/efi/xen.efi /xen.efi
+
+FROM scratch AS final
+COPY --from=build /xen.efi /xen.efi