payloads/external/LinuxBoot/targets/linux.mk

   1 ## SPDX-License-Identifier: GPL-2.0-only
   2
   3 SHELL := /bin/sh
   4
   5 OBJCOPY:=$(CONFIG_LINUXBOOT_CROSS_COMPILE)objcopy
   6 KERNEL_MAKE_FLAGS = \
   7         CROSS_COMPILE=$(CONFIG_LINUXBOOT_CROSS_COMPILE) \
   8         ARCH=$(LINUX_ARCH-y) \
   9         KBUILD_BUILD_USER="coreboot" \
  10         KBUILD_BUILD_HOST="reproducible" \
  11         KBUILD_BUILD_TIMESTAMP="$(shell perl -e 'print scalar gmtime($(SOURCE_DATE_EPOCH))')" \
  12         KBUILD_BUILD_VERSION="0"
  13
  14 kernel_version = $(CONFIG_LINUXBOOT_KERNEL_VERSION)
  15 kernel_dir = build/kernel-$(subst .,_,$(kernel_version))
  16 kernel_tarball = linux-$(kernel_version).tar
  17 kernel_mirror  = https://mirrors.edge.kernel.org/pub/linux/kernel
  18
  19 ifeq ($(findstring x2.6.,x$(kernel_version)),x2.6.)
  20 kernel_mirror_path := $(kernel_mirror)/v2.6
  21 else ifeq ($(findstring x3.,x$(kernel_version)),x3.)
  22 kernel_mirror_path := $(kernel_mirror)/v3.x
  23 else ifeq ($(findstring x4.,x$(kernel_version)),x4.)
  24 kernel_mirror_path := $(kernel_mirror)/v4.x
  25 else ifeq ($(findstring x5.,x$(kernel_version)),x5.)
  26 kernel_mirror_path := $(kernel_mirror)/v5.x
  27 else ifeq ($(findstring x6.,x$(kernel_version)),x6.)
  28 kernel_mirror_path := $(kernel_mirror)/v6.x
  29 endif
  30
  31 build/$(kernel_tarball).xz: | build
  32         echo "    Test $(kernel_version)"
  33         echo "    WWW        $(kernel_mirror_path)/$(kernel_tarball).xz";
  34         curl -OLSs --output-dir build "$(kernel_mirror_path)/$(kernel_tarball).xz";
  35
  36 $(kernel_dir): build/$(kernel_tarball).xz
  37         echo "    XZ         $(kernel_tarball).xz";
  38         mkdir $(kernel_dir);
  39         tar xJf build/$(kernel_tarball).xz --strip 1 -C $(kernel_dir);
  40
  41 $(kernel_dir)/.config: $(CONFIG_LINUXBOOT_KERNEL_CONFIGFILE) | $(kernel_dir)
  42         @echo "    CONFIG     Linux $(kernel_version)"
  43         cp $(CONFIG_LINUXBOOT_KERNEL_CONFIGFILE) $(kernel_dir)/.config
  44         $(MAKE) -C $(kernel_dir) $(KERNEL_MAKE_FLAGS) olddefconfig
  45
  46 $(kernel_dir)/vmlinux : $(kernel_dir)/.config | $(kernel_dir)
  47         @echo "    MAKE       Linux $(kernel_version)"
  48         echo "$(MAKE) -j $(CPUS) -C $(kernel_dir) $(KERNEL_MAKE_FLAGS) vmlinux"
  49         $(MAKE) -j $(CPUS) -C $(kernel_dir) $(KERNEL_MAKE_FLAGS) vmlinux
  50
  51 build/vmlinux.bin: $(kernel_dir)/vmlinux | build
  52         $(OBJCOPY) -O binary $< $@
  53
  54 build/vmlinux.bin.lzma: build/vmlinux.bin
  55         xz -c -k -f --format=lzma --lzma1=dict=1MiB,lc=3,lp=0,pb=3 $< > $@
  56
  57 $(kernel_dir)/arch/x86/boot/bzImage: $(kernel_dir)/.config
  58         @echo "    MAKE       Linux $(kernel_version)"
  59         echo "$(MAKE) -C $(kernel_dir) $(KERNEL_MAKE_FLAGS) bzImage"
  60         $(MAKE) -C $(kernel_dir) $(KERNEL_MAKE_FLAGS) bzImage
  61
  62 .PHONY: kernel