From 41b51f692aa55954c59ba474166c6fcf159405e2 Mon Sep 17 00:00:00 2001
From: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Date: Sun, 1 Jun 2025 20:54:56 +0200
Subject: [PATCH] Add support for netboot

This includes building a tftp root and using it with qemu.
---
 Makefile   |  6 ++++++
 mk/disk.mk |  9 ++++++++-
 mk/qemu.mk | 14 ++++++++++++--
 redox.ipxe |  5 +++++
 4 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 redox.ipxe

diff --git a/Makefile b/Makefile
index e0de2def9..8af03f3ea 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,12 @@ live:
 	rm -f $(BUILD)/livedisk.iso
 	$(MAKE) $(BUILD)/livedisk.iso
 
+netboot:
+	-$(FUMOUNT) $(BUILD)/filesystem/ || true
+	-$(FUMOUNT) /tmp/redox_installer/ || true
+	rm -rf $(BUILD)/livedisk.iso $(BUILD)/tftproot
+	$(MAKE) $(BUILD)/tftproot
+
 popsicle: $(BUILD)/livedisk.iso
 	popsicle-gtk $(BUILD)/livedisk.iso
 
diff --git a/mk/disk.mk b/mk/disk.mk
index 39b3aa3e2..c23a72c3c 100644
--- a/mk/disk.mk
+++ b/mk/disk.mk
@@ -21,9 +21,16 @@ $(BUILD)/livedisk.iso: $(HOST_FSTOOLS) $(REPO_TAG)
 	FILESYSTEM_SIZE=$(shell $(INSTALLER) --filesystem-size -c $(FILESYSTEM_CONFIG)); \
 	fi && \
 	truncate -s "$$FILESYSTEM_SIZE"m $@.partial
-	umask 002 && $(INSTALLER) $(INSTALLER_OPTS) -c $(FILESYSTEM_CONFIG) --live $@.partial
+	umask 002 && $(INSTALLER) $(INSTALLER_OPTS) -c $(FILESYSTEM_CONFIG) --write-bootloader="$(BUILD)/bootloader-live.efi" --live $@.partial
 	mv $@.partial $@
 
+$(BUILD)/tftproot: $(HOST_FSTOOLS) $(REPO_TAG) $(BUILD)/livedisk.iso
+	rm -r $(BUILD)/tftproot || true
+	mkdir $(BUILD)/tftproot
+	cp $(BUILD)/bootloader-live.efi $(BUILD)/tftproot/bootloader-live.efi
+	ln -s ../livedisk.iso $(BUILD)/tftproot/redox-live.img
+	cp redox.ipxe $(BUILD)/tftproot/redox.ipxe
+
 $(BUILD)/filesystem.img: $(HOST_FSTOOLS) $(REPO_TAG)
 	mkdir -p $(BUILD)
 	-$(FUMOUNT) $(BUILD)/filesystem/ || true
diff --git a/mk/qemu.mk b/mk/qemu.mk
index 0a2a479a8..b91923f7b 100644
--- a/mk/qemu.mk
+++ b/mk/qemu.mk
@@ -2,6 +2,7 @@
 
 QEMU=SDL_VIDEO_X11_DGAMOUSE=0 qemu-system-$(QEMU_ARCH)
 QEMUFLAGS=-d guest_errors -name "Redox OS $(ARCH)"
+netboot?=no
 
 ifeq ($(ARCH),i686)
 	audio?=ac97
@@ -148,14 +149,19 @@ else
 		QEMUFLAGS+=-device e1000,netdev=net0,id=nic0
 	endif
 
+	EXTRANETARGS=
+	ifeq ($(netboot),yes)
+		EXTRANETARGS+=,tftp=$(BUILD)/tftproot,bootfile=redox.ipxe
+	endif
+
 	ifneq ($(bridge),)
 		QEMUFLAGS+=-netdev bridge,br=$(bridge),id=net0
 	else ifeq ($(net),redir)
 		# port 8080 and 8083 - webservers
 		# port 64126 - our gdbserver implementation
-		QEMUFLAGS+=-netdev user,id=net0,hostfwd=tcp::8080-:8080,hostfwd=tcp::8083-:8083,hostfwd=tcp::64126-:64126
+		QEMUFLAGS+=-netdev user,id=net0,hostfwd=tcp::8080-:8080,hostfwd=tcp::8083-:8083,hostfwd=tcp::64126-:64126$(EXTRANETARGS)
 	else
-		QEMUFLAGS+=-netdev user,id=net0 -object filter-dump,id=f1,netdev=net0,file=$(BUILD)/network.pcap
+		QEMUFLAGS+=-netdev user,id=net0$(EXTRANETARGS) -object filter-dump,id=f1,netdev=net0,file=$(BUILD)/network.pcap
 	endif
 endif
 
@@ -236,6 +242,10 @@ qemu-deps:$(FIRMWARE)
 
 qemu-deps:$(QEMU_KERNEL)
 
+ifeq ($(netboot),yes)
+qemu-deps: $(BUILD)/tftproot
+endif
+
 qemu-deps: $(PFLASH0)
 
 ifneq ($(PFLASH1),)
diff --git a/redox.ipxe b/redox.ipxe
new file mode 100644
index 000000000..f92772110
--- /dev/null
+++ b/redox.ipxe
@@ -0,0 +1,5 @@
+#!ipxe
+
+kernel bootloader-live.efi
+initrd redox-live.img
+boot