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Makefile
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modules :=
pwd := $(shell pwd)
packages := $(pwd)/packages
build := $(pwd)/build
config := $(pwd)/build
all:
include modules/*
all: $(modules)
define prefix =
$(foreach _, $2, $1$_)
endef
define outputs =
$(foreach m,$1,$(call prefix,$(build)/$($m_dir)/,$($m_output)))
endef
#
# Generate the targets for a module.
#
# Special variables like $@ must be written as $$@ to avoid
# expansion during the first evaluation.
#
define define_module =
# Fetch and verify the source tar file
$(packages)/$($1_tar):
wget -O "$$@" $($1_url)
$(packages)/.$1_verify: $(packages)/$($1_tar)
echo "$($1_hash) $$^" | sha256sum --check -
touch "$$@"
# Unpack the tar file and touch the canary so that we know
# that the files are all present
$(build)/$($1_dir)/.canary: $(packages)/.$1_verify
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tar -xf "$(packages)/$($1_tar)" -C "$(build)"
if [ -r patches/$1-$($1_version).patch ]; then \
( cd $(build)/$($1_dir) ; patch -p1 ) < patches/$1-$($1_version).patch; \
fi
touch "$$@"
# Copy our stored config file into the unpacked directory
$(build)/$($1_dir)/.config: config/$1.config $(build)/$($1_dir)/.canary
cp "$$<" "$$@"
# Use the module's configure variable to build itself
$(build)/$($1_dir)/.configured: \
$(build)/$($1_dir)/.canary \
$(build)/$($1_dir)/.config
cd "$(build)/$($1_dir)" ; $($1_configure)
touch "$$@"
# Build the target after any dependencies
$(call outputs,$1): \
$(build)/$($1_dir)/.configured \
$(call outputs,$($1_depends))
make -C "$(build)/$($1_dir)" $($1_target)
# Short hand target for the module
$1: $(call outputs,$1)
endef
$(foreach _, $(modules), $(eval $(call define_module,$_)))
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#
# Files that should be copied into the initrd
# THis should probably be done in a more scalable manner
#
define initrd_bin =
initrd/bin/$(notdir $1): $1
@if [ ! -d initrd/bin ]; then mkdir "initrd/bin"; fi
cmp --quiet "$$@" "$$^" || \
cp -a "$$^" "$$@"
initrd_bins += initrd/bin/$(notdir $1)
endef
$(foreach _, $(call outputs,kexec), $(eval $(call initrd_bin,$_)))
$(foreach _, $(call outputs,tpmtotp), $(eval $(call initrd_bin,$_)))
$(foreach _, $(call outputs,xen), $(eval $(call initrd_bin,$_)))
# hack to install busybox into the initrd
initrd_bins += initrd/bin/busybox
initrd/bin/busybox: $(build)/$(busybox_dir)/busybox
cmp --quiet "$@" "$^" || \
make \
-C $(build)/$(busybox_dir) \
CONFIG_PREFIX="$(pwd)/initrd" \
install
# hack to build cbmem from coreboot
initrd_bins += initrd/bin/cbmem
initrd/bin/cbmem: $(build)/$(coreboot_dir)/util/cbmem/cbmem
cmp --quiet "$^" "$@" \
|| cp "$^" "$@"
$(build)/$(coreboot_dir)/util/cbmem/cbmem: $(build)/$(coreboot_dir)/.canary
make -C "$(dir $@)"
# Update all of the libraries in the initrd based on the executables
# that were installed.
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initrd_libs: $(initrd_bins)
./populate-lib \
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./initrd/lib/x86_64-linux-gnu/ \
initrd/bin/* \
initrd/sbin/* \
#
# initrd image creation
#
# The initrd is constructed from various bits and pieces
# Note the touch and sort operation on the find output -- this
# ensures that the files always have the same timestamp and
# appear in the same order.
#
# If there is in /dev/console, initrd can't startup.
# We have to force it to be included into the cpio image.
#
#
initrd.cpio: $(initrd_bins) initrd_libs
find ./initrd -type f -print0 \
| xargs -0 touch -d "1970-01-01"
cd ./initrd ; \
( \
echo "/dev" ; \
echo "/dev/console"; \
find . \
) \
| sort \
| cpio --quiet -H newc -o \
> "../$@.tmp"
if ! cmp --quiet "$@" "$@.tmp"; then \
mv "$@.tmp" "$@"; \
else \
echo "$@: Unchanged"; \
rm "$@.tmp"; \
fi
# hack for the linux kernel to depend on the initrd image
# this will change once coreboot can link in the initrd separately
$(call outputs,linux): initrd.cpio
# hack for the coreboot to find the linux kernel
$(build)/$(coreboot_dir)/bzImage: $(call outputs,linux)
cmp --quiet "$@" "$^" || \
cp -a "$^" "$@"
$(call outputs,coreboot): $(build)/$(coreboot_dir)/bzImage