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Makefile
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# RISCV should either be unset, or set to point to a directory that contains
# a toolchain install tree that was built via other means.
RISCV ?= $(CURDIR)/toolchain
PATH := $(RISCV)/bin:$(PATH)
ISA ?= rv64imafdc
ABI ?= lp64d
LINUX_VER ?= 5.8.1
LINUX_MIRROR ?= https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/linux-$(LINUX_VER).tar.gz
srcdir := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
srcdir := $(srcdir:/=)
confdir := $(srcdir)/conf
wrkdir := $(CURDIR)/work
toolchain_srcdir := $(srcdir)/riscv-gnu-toolchain
toolchain_wrkdir := $(wrkdir)/riscv-gnu-toolchain
toolchain_dest := $(CURDIR)/toolchain
buildroot_srcdir := $(srcdir)/buildroot
buildroot_initramfs_wrkdir := $(wrkdir)/buildroot_initramfs
buildroot_initramfs_tar := $(buildroot_initramfs_wrkdir)/images/rootfs.tar
buildroot_initramfs_config := $(confdir)/buildroot_initramfs_config
buildroot_initramfs_sysroot_stamp := $(wrkdir)/.buildroot_initramfs_sysroot
buildroot_initramfs_sysroot := $(wrkdir)/buildroot_initramfs_sysroot
linux_srcdir := $(srcdir)/linux
linux_wrkdir := $(wrkdir)/linux
linux_defconfig := $(confdir)/linux_defconfig
vmlinux := $(linux_wrkdir)/vmlinux
vmlinux_stripped := $(linux_wrkdir)/vmlinux-stripped
pk_srcdir := $(srcdir)/riscv-pk
pk_wrkdir := $(wrkdir)/riscv-pk
bbl := $(pk_wrkdir)/bbl
pk := $(pk_wrkdir)/pk
spike_srcdir := $(srcdir)/riscv-isa-sim
spike_wrkdir := $(wrkdir)/riscv-isa-sim
spike := $(toolchain_dest)/bin/spike
qemu_srcdir := $(srcdir)/riscv-gnu-toolchain/qemu
qemu_wrkdir := $(wrkdir)/qemu
qemu := $(qemu_wrkdir)/prefix/bin/qemu-system-riscv64
target_linux := riscv64-unknown-linux-gnu
target_newlib := riscv64-unknown-elf
.PHONY: all
all: sim
newlib: $(RISCV)/bin/$(target_newlib)-gcc
ifneq ($(RISCV),$(toolchain_dest))
$(RISCV)/bin/$(target_linux)-gcc:
$(error The RISCV environment variable was set, but is not pointing at a toolchain install tree)
endif
$(linux_srcdir):
curl $(LINUX_MIRROR) | tar zxf -
mv linux-$(LINUX_VER) linux
$(toolchain_dest)/bin/$(target_linux)-gcc: $(linux_srcdir) $(toolchain_srcdir)
mkdir -p $(toolchain_wrkdir)
$(MAKE) -C $(linux_srcdir) O=$(toolchain_wrkdir) ARCH=riscv INSTALL_HDR_PATH=$(abspath $(toolchain_srcdir)/linux-headers) headers_install
cd $(toolchain_wrkdir); $(toolchain_srcdir)/configure \
--prefix=$(toolchain_dest) \
--with-arch=$(ISA) \
--with-abi=$(ABI)
$(MAKE) -C $(toolchain_wrkdir) linux
# sed 's/^#define LINUX_VERSION_CODE.*/#define LINUX_VERSION_CODE 329226/' -i $(toolchain_dest)/sysroot/usr/include/linux/version.h
$(toolchain_dest)/bin/$(target_newlib)-gcc: $(toolchain_srcdir)
mkdir -p $(toolchain_wrkdir)
cd $(toolchain_wrkdir); $(toolchain_srcdir)/configure \
--prefix=$(toolchain_dest) \
--with-arch=$(ISA) \
--with-abi=$(ABI)
$(MAKE) -C $(toolchain_wrkdir)
$(buildroot_initramfs_wrkdir)/.config: $(buildroot_srcdir)
rm -rf $(dir $@)
mkdir -p $(dir $@)
cp $(buildroot_initramfs_config) $@
$(MAKE) -C $< RISCV=$(RISCV) PATH=$(PATH) O=$(buildroot_initramfs_wrkdir) olddefconfig CROSS_COMPILE=riscv64-unknown-linux-gnu-
$(buildroot_initramfs_tar): $(buildroot_srcdir) $(buildroot_initramfs_wrkdir)/.config $(RISCV)/bin/$(target_linux)-gcc $(buildroot_initramfs_config)
$(MAKE) -C $< RISCV=$(RISCV) PATH=$(PATH) O=$(buildroot_initramfs_wrkdir)
.PHONY: buildroot_initramfs-menuconfig
buildroot_initramfs-menuconfig: $(buildroot_initramfs_wrkdir)/.config $(buildroot_srcdir)
$(MAKE) -C $(dir $<) O=$(buildroot_initramfs_wrkdir) menuconfig
$(MAKE) -C $(dir $<) O=$(buildroot_initramfs_wrkdir) savedefconfig
cp $(dir $<)/defconfig conf/buildroot_initramfs_config
$(buildroot_initramfs_sysroot): $(buildroot_initramfs_tar)
mkdir -p $(buildroot_initramfs_sysroot)
tar -xpf $< -C $(buildroot_initramfs_sysroot) --exclude ./dev --exclude ./usr/share/locale
$(linux_wrkdir)/.config: $(linux_defconfig) $(linux_srcdir)
mkdir -p $(dir $@)
cp -p $< $@
$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
echo $(ISA)
echo $(filter rv32%,$(ISA))
ifeq (,$(filter rv%c,$(ISA)))
sed 's/^.*CONFIG_RISCV_ISA_C.*$$/CONFIG_RISCV_ISA_C=n/' -i $@
$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
endif
ifeq ($(ISA),$(filter rv32%,$(ISA)))
sed 's/^.*CONFIG_ARCH_RV32I.*$$/CONFIG_ARCH_RV32I=y/' -i $@
sed 's/^.*CONFIG_ARCH_RV64I.*$$/CONFIG_ARCH_RV64I=n/' -i $@
$(MAKE) -C $(linux_srcdir) O=$(linux_wrkdir) ARCH=riscv olddefconfig
endif
$(vmlinux): $(linux_srcdir) $(linux_wrkdir)/.config $(buildroot_initramfs_sysroot)
$(MAKE) -C $< O=$(linux_wrkdir) \
CONFIG_INITRAMFS_SOURCE="$(confdir)/initramfs.txt $(buildroot_initramfs_sysroot)" \
CONFIG_INITRAMFS_ROOT_UID=$(shell id -u) \
CONFIG_INITRAMFS_ROOT_GID=$(shell id -g) \
CROSS_COMPILE=riscv64-unknown-linux-gnu- \
ARCH=riscv V=1 \
vmlinux
$(vmlinux_stripped): $(vmlinux)
$(target_linux)-strip -o $@ $<
.PHONY: linux-menuconfig
linux-menuconfig: $(linux_wrkdir)/.config
$(MAKE) -C $(linux_srcdir) O=$(dir $<) ARCH=riscv menuconfig
$(MAKE) -C $(linux_srcdir) O=$(dir $<) ARCH=riscv savedefconfig
cp $(dir $<)/defconfig conf/linux_defconfig
$(bbl): $(pk_srcdir) $(vmlinux_stripped)
rm -rf $(pk_wrkdir)
mkdir -p $(pk_wrkdir)
cd $(pk_wrkdir) && $</configure \
--host=$(target_linux) \
--with-payload=$(vmlinux_stripped) \
--enable-logo \
--with-logo=$(abspath conf/logo.txt)
CFLAGS="-mabi=$(ABI) -march=$(ISA)" $(MAKE) -C $(pk_wrkdir)
$(pk): $(pk_srcdir) $(RISCV)/bin/$(target_newlib)-gcc
rm -rf $(pk_wrkdir)
mkdir -p $(pk_wrkdir)
cd $(pk_wrkdir) && $</configure \
--host=$(target_newlib) \
--prefix=$(abspath $(toolchain_dest))
CFLAGS="-mabi=$(ABI) -march=$(ISA)" $(MAKE) -C $(pk_wrkdir)
$(MAKE) -C $(pk_wrkdir) install
$(spike): $(spike_srcdir)
rm -rf $(spike_wrkdir)
mkdir -p $(spike_wrkdir)
mkdir -p $(dir $@)
cd $(spike_wrkdir) && $</configure \
--prefix=$(dir $(abspath $(dir $@)))
$(MAKE) -C $(spike_wrkdir)
$(MAKE) -C $(spike_wrkdir) install
touch -c $@
$(qemu): $(qemu_srcdir)
rm -rf $(qemu_wrkdir)
mkdir -p $(qemu_wrkdir)
mkdir -p $(dir $@)
cd $(qemu_wrkdir) && $</configure \
--prefix=$(dir $(abspath $(dir $@))) \
--target-list=riscv64-linux-user,riscv64-softmmu
$(MAKE) -C $(qemu_wrkdir)
$(MAKE) -C $(qemu_wrkdir) install
touch -c $@
.PHONY: buildroot_initramfs_sysroot vmlinux bbl
buildroot_initramfs_sysroot: $(buildroot_initramfs_sysroot)
vmlinux: $(vmlinux)
bbl: $(bbl)
.PHONY: clean
clean:
rm -rf -- $(wrkdir) $(toolchain_dest)
.PHONY: sim
sim: $(bbl) $(spike)
$(spike) --isa=$(ISA) -p4 $(bbl)
.PHONY: qemu
qemu: $(qemu) $(bbl)
$(qemu) -nographic -machine virt -kernel $(bbl) \
-netdev user,id=net0 -device virtio-net-device,netdev=net0