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152 lines
3.6 KiB
Makefile
152 lines
3.6 KiB
Makefile
modules :=
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pwd := $(shell pwd)
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packages := $(pwd)/packages
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build := $(pwd)/build
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config := $(pwd)/build
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all:
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include modules/*
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all: $(modules)
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define prefix =
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$(foreach _, $2, $1$_)
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endef
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define outputs =
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$(foreach m,$1,$(call prefix,$(build)/$($m_dir)/,$($m_output)))
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endef
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#
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# Generate the targets for a module.
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#
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# Special variables like $@ must be written as $$@ to avoid
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# expansion during the first evaluation.
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#
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define define_module =
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# Fetch and verify the source tar file
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$(packages)/$($1_tar):
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wget -O "$$@" $($1_url)
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$(packages)/.$1_verify: $(packages)/$($1_tar)
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echo "$($1_hash) $$^" | sha256sum --check -
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touch "$$@"
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# Unpack the tar file and touch the canary so that we know
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# that the files are all present
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$(build)/$($1_dir)/.canary: \
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$(packages)/.$1_verify \
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$(call outputs,$($1_depends))
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tar -xf "$(packages)/$($1_tar)" -C "$(build)"
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touch "$$@"
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# Copy our stored config file into the unpacked directory
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$(build)/$($1_dir)/.config: config/$1.config $(build)/$($1_dir)/.canary
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cp "$$<" "$$@"
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# Use the module's configure variable to build itself
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$(build)/$($1_dir)/.configured: \
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$(build)/$($1_dir)/.canary \
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$(build)/$($1_dir)/.config
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cd "$(build)/$($1_dir)" ; $($1_configure)
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touch "$$@"
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# Build the target after any dependencies
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$(call outputs,$1): \
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$(build)/$($1_dir)/.configured \
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$(call outputs,$($1_depends))
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make -C "$(build)/$($1_dir)" $($1_target)
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# Short hand target for the module
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$1: $(call outputs,$1)
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endef
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$(foreach _, $(modules), $(eval $(call define_module,$_)))
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#
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# Files that should be copied into the initrd
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# THis should probably be done in a more scalable manner
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#
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define initrd_bin =
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initrd/bin/$(notdir $1): $1
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@if [ ! -d initrd/bin ]; then mkdir "initrd/bin"; fi
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cmp --quiet "$$@" "$$^" || \
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cp -a "$$^" "$$@"
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initrd_bins += initrd/bin/$(notdir $1)
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endef
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$(foreach _, $(call outputs,kexec), $(eval $(call initrd_bin,$_)))
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$(foreach _, $(call outputs,tpmtotp), $(eval $(call initrd_bin,$_)))
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# hack to install busybox into the initrd
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initrd_bins += initrd/bin/busybox
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initrd/bin/busybox: $(build)/$(busybox_dir)/busybox
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cmp --quiet "$@" "$^" || \
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make \
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-C $(build)/$(busybox_dir) \
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CONFIG_PREFIX="$(pwd)/initrd" \
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install
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# Update all of the libraries in the initrd based on the executables
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# that were installed.
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initrd_libs: $(initrd_bins)
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./populate-lib \
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./initrd/lib/x86_64-linux-gnu/ \
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initrd/bin/* \
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initrd/sbin/* \
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#
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# We also have to include some real /dev files; the minimal
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# set should be determined.
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#
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initrd_devs += /dev/console
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initrd_devs += /dev/mem
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initrd_devs += /dev/null
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initrd_devs += /dev/tty
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initrd_devs += /dev/tty0
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initrd_devs += /dev/ttyS0
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#
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# initrd image creation
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#
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# The initrd is constructed from various bits and pieces
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# Note the touch and sort operation on the find output -- this
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# ensures that the files always have the same timestamp and
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# appear in the same order.
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#
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# This breaks on the files in /dev.
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#
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#
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initrd.cpio: $(initrd_bins) initrd_libs
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find ./initrd -type f -print0 \
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| xargs -0 touch -d "1970-01-01"
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cd ./initrd; \
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find . $(initrd_devs) \
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| sort \
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| cpio --quiet -H newc -o \
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> "../$@.tmp"
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if ! cmp --quiet "$@" "$@.tmp"; then \
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mv "$@.tmp" "$@"; \
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else \
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echo "$@: Unchanged"; \
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rm "$@.tmp"; \
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fi
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# hack for the linux kernel to depend on the initrd image
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# this will change once coreboot can link in the initrd separately
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$(call outputs,linux): initrd.cpio
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# hack for the coreboot to find the linux kernel
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$(build)/$(coreboot_dir)/bzImage: $(call outputs,linux)
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cmp --quiet "$@" "$^" || \
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cp -a "$^" "$@"
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$(call outputs,coreboot): $(build)/$(coreboot_dir)/bzImage
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