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RedBear-OS/mk/qemu.mk
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vasilito 50b731f1b7 Red Bear OS — microkernel OS in Rust, based on Redox 
Derivative of Redox OS (https://www.redox-os.org) adding:
- AMD GPU driver (amdgpu) via LinuxKPI compat layer
- ext4 filesystem support (ext4d scheme daemon)
- ACPI fixes for AMD bare metal (x2APIC, DMAR, IVRS, MCFG)
- Custom branding (hostname, os-release, boot identity)

Build system is full upstream Redox with RBOS overlay in local/.
Patches for kernel, base, and relibc are symlinked from local/patches/
and protected from make clean/distclean. Custom recipes live in
local/recipes/ with symlinks into the recipes/ search path.

Build:  make all CONFIG_NAME=redbear-full
Sync:   ./local/scripts/sync-upstream.sh
2026-04-12 19:05:00 +01:00

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# Configuration file for QEMU
QEMU=qemu-system-$(QEMU_ARCH)
QEMUFLAGS=-d guest_errors -name "Red Bear OS $(ARCH)"
netboot?=no
redoxer?=no
VGA_SUPPORTED=no
ifeq ($(ARCH),i586)
audio?=ac97
disk?=ata
gpu?=vga
uefi=no
VGA_SUPPORTED=yes
QEMU_ARCH=i386
QEMU_MACHINE?=pc
QEMU_CPU?=pentium2
QEMU_SMP?=1
QEMU_MEM?=1024
# Default to using kvm when arch is i586 and host is x86_64
ifeq ($(HOST_ARCH),x86_64)
kvm?=yes
endif
else ifeq ($(ARCH),x86_64)
gpu?=vga
uefi?=yes
VGA_SUPPORTED=yes
QEMU_ARCH=x86_64
QEMU_MACHINE?=q35
QEMU_CPU?=core2duo
QEMU_SMP?=4
QEMU_MEM?=2048
ifeq ($(uefi),yes)
FIRMWARE=$(firstword \
$(wildcard /usr/share/ovmf/OVMF.fd) \
$(wildcard /usr/share/OVMF/OVMF_CODE.fd) \
)
ifeq ($(FIRMWARE),)
PFLASH0=$(firstword \
$(wildcard /usr/share/qemu/edk2-x86_64-code.fd) \
$(wildcard /run/libvirt/nix-ovmf/edk2-x86_64-code.fd) \
$(wildcard /opt/homebrew/opt/qemu/share/qemu/edk2s-x86_64-code.fd) \
)
endif
endif
ifneq ($(usb),no)
QEMUFLAGS+=-device qemu-xhci
endif
else ifeq ($(ARCH),aarch64)
# Default to UEFI as U-Boot doesn't set up a framebuffer for us and we don't yet support
# setting up a framebuffer ourself.
uefi?=yes
live?=yes
gpu?=ramfb
QEMU_ARCH=aarch64
QEMU_MACHINE?=virt
QEMU_CPU=max
QEMU_SMP?=1
QEMU_MEM?=2048
ifeq ($(BOARD),raspi3bp)
QEMU_KERNEL=$(BUILD)/raspi3bp_uboot.rom
disk?=sdcard
gpu=none
QEMU_MACHINE:=raspi3b
QEMU_SMP:=4
QEMU_MEM:=1024
net:=usb-net
audio:=no
ifneq ($(usb),no)
QEMUFLAGS+=-usb -device usb-kbd -device usb-tablet
endif
else
ifeq ($(uefi),yes)
FIRMWARE=$(firstword \
$(wildcard /usr/share/AAVMF/AAVMF_CODE.fd) \
)
ifeq ($(FIRMWARE),)
PFLASH0=$(firstword \
$(wildcard /usr/share/qemu/edk2-aarch64-code.fd) \
$(wildcard /run/libvirt/nix-ovmf/edk2-aarch64-code.fd) \
$(wildcard /opt/homebrew/opt/qemu/share/qemu/edk2-aarch64-code.fd) \
)
endif
else
FIRMWARE=$(BUILD)/qemu_uboot.rom
endif
ifneq ($(usb),no)
QEMUFLAGS+=-device qemu-xhci -device usb-kbd -device usb-tablet
endif
endif
# Default to using HVF when host is MacOS Silicon
ifeq ($(HOST_ARCH),arm64)
kvm?=yes
endif
else ifeq ($(ARCH),riscv64gc)
live=no
audio=no
gpu?=ramfb
net=bridge
QEMU_ARCH=riscv64
# QEMU_MACHINE=virt for ACPI mode instead of DTB
QEMU_MACHINE=virt,acpi=off
# QEMU_MACHINE:=${QEMU_MACHINE},aclint=on
# QEMU_MACHINE:=${QEMU_MACHINE},aia=aplic
# QEMU_MACHINE:=${QEMU_MACHINE},aia=aplic-imsic
QEMU_SMP?=4
QEMU_MEM?=2048
QEMU_CPU=max
PFLASH0=$(firstword \
$(wildcard /usr/share/qemu-efi-riscv64/RISCV_VIRT_CODE.fd) \
$(wildcard /usr/share/edk2/riscv/RISCV_VIRT_CODE.fd) \
$(wildcard /usr/share/qemu/edk2-riscv-code.fd) \
$(wildcard /run/libvirt/nix-ovmf/edk2-riscv-code.fd) \
$(wildcard /opt/homebrew/opt/qemu/share/qemu/edk2-riscv-code.fd) \
)
PFLASH1=$(firstword \
$(wildcard /usr/share/qemu-efi-riscv64/RISCV_VIRT_VARS.fd) \
$(wildcard /usr/share/edk2/riscv/RISCV_VIRT_VARS.fd) \
$(wildcard /usr/share/qemu/edk2-riscv-vars.fd) \
$(wildcard /run/libvirt/nix-ovmf/edk2-riscv-vars.fd) \
$(wildcard /opt/homebrew/opt/qemu/share/qemu/edk2-riscv-vars.fd) \
)
ifneq ($(usb),no)
QEMUFLAGS+=-device qemu-xhci -device usb-kbd -device usb-tablet
endif
else
$(error Unsupported ARCH for QEMU "$(ARCH)"))
endif
QEMUFLAGS+=-smp $(QEMU_SMP) -m $(QEMU_MEM)
# If host and target arch do not match, disable kvm
# (unless overridden above or by environment)
ifneq ($(ARCH),$(HOST_ARCH))
kvm?=no
endif
# wsl2: run qemu on windows instead
ifeq ($(QEMU_ON_WINDOWS),1)
QEMU:=$(QEMU).exe
WINDOWS_DISK=/mnt/c/ProgramData/redox.img
disk=windows
net=windows
QEMU_MACHINE=pc
FIRMWARE=
QEMU_KERNEL=
QEMUFLAGS+=-device usb-tablet
endif
ifneq ($(FIRMWARE),)
QEMUFLAGS+=-bios $(FIRMWARE)
endif
ifneq ($(QEMU_KERNEL),)
QEMUFLAGS+=-kernel $(QEMU_KERNEL)
endif
ifeq ($(live),yes)
DISK=$(BUILD)/rbos-live.iso
else
DISK=$(BUILD)/harddrive.img
endif
ifeq ($(serial),no)
QEMUFLAGS+=-chardev stdio,id=debug -device isa-debugcon,iobase=0x402,chardev=debug
else
QEMUFLAGS+=-chardev stdio,id=debug,signal=off,mux=on,"$(if $(qemu_serial_logfile),logfile=$(qemu_serial_logfile))"
QEMUFLAGS+=-serial chardev:debug -mon chardev=debug
endif
# redoxer exit code: 51 => success, 53 => failure
ifeq ($(redoxer),yes)
ifeq ($(ARCH),x86_64)
QEMUFLAGS+=-device isa-debug-exit
else ifeq ($(ARCH),i586)
QEMUFLAGS+=-device isa-debug-exit
else ifeq ($(ARCH),aarch64)
QEMUFLAGS+=-semihosting-config enable=on,target=native,userspace=on
endif
endif
ifeq ($(iommu),yes)
QEMUFLAGS+=-machine $(QEMU_MACHINE),iommu=on
else
QEMUFLAGS+=-machine $(QEMU_MACHINE)
endif
ifeq ($(audio),no)
# No audio
else ifeq ($(audio),ac97)
# AC'97
QEMUFLAGS+=-device AC97
else
# Intel High Definition Audio
QEMUFLAGS+=-device ich9-intel-hda -device hda-output
endif
ifeq ($(net),no)
QEMUFLAGS+=-net none
else
ifeq ($(net),rtl8139) # RTL8139
QEMUFLAGS+=-device rtl8139,netdev=net0
else ifeq ($(net),virtio) # virtio-net
QEMUFLAGS+=-device virtio-net,netdev=net0
else ifeq ($(net),usb-net)
QEMUFLAGS+=-device usb-net,netdev=net0
else
QEMUFLAGS+=-device e1000,netdev=net0,id=nic0
endif
EXTRANETARGS=
ifeq ($(netboot),yes)
EXTRANETARGS+=,tftp=$(BUILD),bootfile=rbos.ipxe
QEMUFLAGS+=-kernel /usr/lib/ipxe/ipxe-amd64.efi
endif
ifneq ($(bridge),)
QEMUFLAGS+=-netdev bridge,br=$(bridge),id=net0
else ifeq ($(net),redir)
# port 8022 - ssh
# port 8080-8083 - webservers
# port 64126 - our gdbserver implementation
FWD_PORTS := 8081 8082 8083 64126
FWD_FLAGS := hostfwd=tcp::8022-:22,hostfwd=tcp::8080-:80
FWD_FLAGS2 := $(foreach p,$(FWD_PORTS),,hostfwd=tcp::$(p)-:$(p))
QEMUFLAGS += -netdev user,id=net0,$(FWD_FLAGS)$(subst $(eval ) ,,$(FWD_FLAGS2))$(EXTRANETARGS)
else ifeq ($(net),windows)
QEMUFLAGS+=-netdev user,id=net0$(EXTRANETARGS)
else
QEMUFLAGS+=-netdev user,id=net0$(EXTRANETARGS) -object filter-dump,id=f1,netdev=net0,file=$(BUILD)/network.pcap
endif
endif
ifeq ($(gpu),no)
QEMUFLAGS+=-nographic -vga none
else ifeq ($(gpu),vga)
ifeq ($(VGA_SUPPORTED),yes)
QEMUFLAGS+=-vga std
else
QEMUFLAGS+=-vga none -device secondary-vga
endif
else ifeq ($(gpu),ramfb)
QEMUFLAGS+=-vga none -device ramfb
else ifeq ($(gpu),multi)
ifeq ($(VGA_SUPPORTED),yes)
QEMUFLAGS+=-display sdl -vga none -device virtio-vga,max_outputs=2
else
QEMUFLAGS+=-display sdl -vga none -device virtio-gpu,max_outputs=2
endif
else ifeq ($(gpu),virtio)
ifeq ($(VGA_SUPPORTED),yes)
QEMUFLAGS+=-vga none -device virtio-vga
else
QEMUFLAGS+=-vga none -device virtio-gpu
endif
else ifeq ($(gpu),virtio-sdl)
ifeq ($(VGA_SUPPORTED),yes)
QEMUFLAGS+=-vga none -device virtio-vga -display sdl,show-cursor=on
else
QEMUFLAGS+=-vga none -device virtio-gpu -display sdl,show-cursor=on
endif
else ifeq ($(gpu),virtio-gl)
ifeq ($(VGA_SUPPORTED),yes)
QEMUFLAGS+=-display gtk,gl=on -vga none -device virtio-vga-gl
else
QEMUFLAGS+=-display gtk,gl=on -vga none -device virtio-gpu-gl
endif
endif
EXTRA_DISK=$(BUILD)/extra.img
disk?=nvme
ifeq ($(disk),ata)
# For i386, ata will use ided
# For aarch64 and x86_64, ata will use ahcid
QEMUFLAGS+= \
-drive file=$(DISK),format=raw \
-drive file=$(EXTRA_DISK),format=raw
else ifeq ($(disk),nvme)
QEMUFLAGS+= \
-drive file=$(DISK),format=raw,if=none,id=drv0 -device nvme,drive=drv0,serial=NVME_SERIAL \
-drive file=$(EXTRA_DISK),format=raw,if=none,id=drv1 -device nvme,drive=drv1,serial=NVME_EXTRA
else ifeq ($(disk),usb)
QEMUFLAGS+= \
-drive if=none,id=usbstick,format=raw,file=$(DISK) \
-device usb-storage,drive=usbstick
else ifeq ($(disk),virtio)
QEMUFLAGS+= \
-drive file=$(DISK),format=raw,if=virtio \
-drive file=$(EXTRA_DISK),format=raw,if=virtio
else ifeq ($(disk),cdrom)
QEMUFLAGS+= \
-boot d -cdrom $(DISK) \
-drive file=$(EXTRA_DISK),format=raw
else ifeq ($(disk),sdcard)
QEMUFLAGS+=-drive file=$(DISK),if=sd,format=raw
else ifeq ($(disk),windows)
QEMUFLAGS+=-drive file="$(shell wslpath -w $(WINDOWS_DISK))",format=raw,if=virtio
endif
ifeq ($(gdb),yes)
QEMUFLAGS+=-d cpu_reset -s -S
else ifeq ($(gdb),nonblock)
# Allow attaching gdb, but don't block for it
QEMUFLAGS+=-d cpu_reset -s
endif
ifeq ($(UNAME),Linux)
ifneq ($(kvm),no)
ifeq ($(QEMU_ON_WINDOWS),1)
QEMUFLAGS+=-accel whpx,kernel-irqchip=off -cpu Broadwell,x2apic=off
else
QEMUFLAGS+=-enable-kvm -cpu host
endif
else
QEMUFLAGS+=-cpu $(QEMU_CPU)
endif
endif
ifeq ($(UNAME),Darwin)
ifneq ($(kvm),no)
QEMUFLAGS+=-accel hvf -cpu max
else
QEMUFLAGS+=-cpu $(QEMU_CPU)
endif
endif
ifneq ($(PFLASH0),)
QEMUFLAGS+=-drive if=pflash,format=raw,unit=0,file=$(PFLASH0),readonly=on
endif
ifneq ($(PFLASH1),)
QEMUFLAGS+=-drive if=pflash,format=raw,unit=1,file=$(BUILD)/fw_vars.bin
endif
.PHONY: qemu-deps
qemu-deps: $(DISK)
ifeq ($(disk),usb)
else ifeq ($(disk),sdcard)
else ifeq ($(disk),windows)
qemu-deps: $(WINDOWS_DISK)
else
qemu-deps: $(EXTRA_DISK)
endif
qemu-deps:$(FIRMWARE)
qemu-deps:$(QEMU_KERNEL)
qemu-deps: $(PFLASH0)
ifneq ($(PFLASH1),)
qemu-deps: $(BUILD)/fw_vars.bin
.PRECIOUS: $(BUILD)/fw_vars.bin
$(BUILD)/fw_vars.bin: $(PFLASH1)
cp "$<" "$@"
endif
$(EXTRA_DISK):
truncate -s 1g $@
$(WINDOWS_DISK): $(BUILD)/harddrive.img
rm -f $@
mkdir -p $(shell dirname $@)
cp "$<" "$@"
$(BUILD)/raspi3bp_uboot.rom:
wget -O $@ https://gitlab.redox-os.org/Ivan/redox_firmware/-/raw/main/platform/raspberry_pi/rpi3/u-boot-rpi-3-b-plus.bin
$(BUILD)/qemu_uboot.rom:
wget -O $@ https://gitlab.redox-os.org/Ivan/redox_firmware/-/raw/main/platform/qemu/qemu_arm64/u-boot-qemu-arm64.bin
qemu: qemu-deps
$(QEMU) $(QEMUFLAGS)
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