# This file declares functions to install the kernel headers for linux

# Copyright 2007 Yann E. MORIN

# Licensed under the GPL v2. See COPYING in the root of this package

do_print_filename() {

    [ "${CT_KERNEL}" = "linux" ] || return 0

    case "${CT_KERNEL_LINUX_HEADERS_SANITISED}" in

        y)  echo "linux-libc-headers-${CT_KERNEL_VERSION}";;

        *)  echo "linux-${CT_KERNEL_VERSION}";;

    esac

}

# Download the kernel

do_kernel_get() {

    if [ "${CT_KERNEL_LINUX_HEADERS_USE_CUSTOM_DIR}" != "y" ]; then

        CT_GetFile "${CT_KERNEL_FILE}"                                                  \

                   {ftp,http}://ftp.kernel.org/pub/linux/kernel/v2.{6{,/testing},4,2}   \

                   http://ep09.pld-linux.org/~mmazur/linux-libc-headers

    fi

    return 0

}

# Extract kernel

do_kernel_extract() {

    if [ "${CT_KERNEL_LINUX_HEADERS_USE_CUSTOM_DIR}" != "y" ]; then

        CT_ExtractAndPatch "${CT_KERNEL_FILE}"

    fi

    return 0

}

# Check kernel configuration

do_kernel_check_config() {

    # Only the copied or sanitised headers need a config file.

    # Pre-existing headers as well as headers_install don't.

    if [ "${CT_KERNEL_LINUX_NEEDS_CONFIG}" = "y"        \

         -a \( -z "${CT_KERNEL_LINUX_CONFIG_FILE}"      \

               -o ! -r "${CT_KERNEL_LINUX_CONFIG_FILE}" \

            \)                                          \

       ]; then

        CT_DoLog WARN "You did not provide a kernel configuration file!"

        CT_DoLog WARN "I will try to generate one for you, but beware!"

        CT_DoStep INFO "Building a default configuration file for linux kernel"

        mkdir -p "${CT_BUILD_DIR}/build-kernel-defconfig"

        cd "${CT_BUILD_DIR}/build-kernel-defconfig"

        make -C "${CT_SRC_DIR}/${CT_KERNEL_FILE}" O=$(pwd)  \

             ARCH=${CT_KERNEL_ARCH} defconfig               2>&1 |CT_DoLog ALL

        CT_KERNEL_LINUX_CONFIG_FILE="$(pwd)/.config"

        CT_EndStep

    fi

}

# Wrapper to the actual headers install method

do_kernel_headers() {

    CT_DoStep INFO "Installing kernel headers"

    # Special case when using pre-installed headers

    if [ "${CT_KERNEL_LINUX_HEADERS_USE_CUSTOM_DIR}" = "y" ]; then

        do_kernel_preinstalled

    else

        # We need to enter this directory to find the kernel version strings

        cd "${CT_SRC_DIR}/${CT_KERNEL_FILE}"

        if [ "${CT_KERNEL_LINUX_HEADERS_SANITISED}" != "y" ]; then

            k_version=$(awk '/^VERSION =/ { print $3 }' Makefile)

            k_patchlevel=$(awk '/^PATCHLEVEL =/ { print $3 }' Makefile)

            k_sublevel=$(awk '/^SUBLEVEL =/ { print $3 }' Makefile)

            k_extraversion=$(awk '/^EXTRAVERSION =/ { print $3 }' Makefile)

        else

            k_version=$(echo "${CT_KERNEL_VERSION}." |cut -d . -f 1)

            k_patchlevel=$(echo "${CT_KERNEL_VERSION}." |cut -d . -f 2)

            k_sublevel=$(echo "${CT_KERNEL_VERSION}." |cut -d . -f 3)

            k_extraversion=$(echo "${CT_KERNEL_VERSION}." |cut -d . -f 4)

        fi

        case "${k_version}.${k_patchlevel}" in

            2.2|2.4|2.6) ;;

            *)  CT_Abort "Unsupported kernel version 'linux-${k_version}.${k_patchlevel}'.";;

        esac

        # Kernel version that support verbosity will use this, others will ignore it:

        V_OPT="V=${CT_KERNEL_LINUX_VERBOSE_LEVEL}"

        if [ "${CT_KERNEL_LINUX_HEADERS_INSTALL}" = "y" ]; then

            do_kernel_install

        elif [ "${CT_KERNEL_LINUX_HEADERS_SANITISED}" = "y" ]; then

            do_kernel_sanitised

        else [ "${CT_KERNEL_LINUX_HEADERS_COPY}" = "y" ];

            do_kernel_copy

        fi

    fi

    CT_EndStep

}

# Install kernel headers using headers_install from kernel sources.

do_kernel_install() {

    CT_DoLog DEBUG "Using kernel's headers_install"

    mkdir -p "${CT_BUILD_DIR}/build-kernel-headers"

    cd "${CT_BUILD_DIR}/build-kernel-headers"

    case "${k_version}.${k_patchlevel}" in

        2.6) [ ${k_sublevel} -ge 18 ] || CT_Abort "Kernel version >= 2.6.18 is needed to install kernel headers.";;

        *)   CT_Abort "Kernel version >= 2.6.18 is needed to install kernel headers.";;

    esac

    CT_DoLog EXTRA "Installing kernel headers"

    CT_DoExecLog ALL                                \

    make -C "${CT_SRC_DIR}/${CT_KERNEL_FILE}"       \

         O=$(pwd)                                   \

         ARCH=${CT_KERNEL_ARCH}                     \

         INSTALL_HDR_PATH="${CT_SYSROOT_DIR}/usr"   \

         ${V_OPT}                                   \

         headers_install

    if [ "${CT_KERNEL_LINUX_HEADERS_INSTALL_CHECK}" = "y" ]; then

        CT_DoLog EXTRA "Checking installed headers"

        CT_DoExecLog ALL                                \

        make -C "${CT_SRC_DIR}/${CT_KERNEL_FILE}"       \

             O=$(pwd)                                   \

             ARCH=${CT_KERNEL_ARCH}                     \

             INSTALL_HDR_PATH="${CT_SYSROOT_DIR}/usr"   \

             ${V_OPT}                                   \

             headers_check

        find "${CT_SYSROOT_DIR}" -type f -name '.check*' -exec rm {} \;

    fi

}

# Install kernel headers from oldish Mazur's sanitised headers.

do_kernel_sanitised() {

    CT_DoLog EXTRA "Copying sanitised headers"

    cd "${CT_SRC_DIR}/${CT_KERNEL_FILE}"

    cp -rv include/linux "${CT_HEADERS_DIR}" 2>&1 |CT_DoLog ALL

    cp -rv "include/asm-${CT_KERNEL_ARCH}" "${CT_HEADERS_DIR}/asm" 2>&1 |CT_DoLog ALL

}

# Install kernel headers by plain copy.

do_kernel_copy() {

    CT_DoLog DEBUG "Copying plain kernel headers"

    CT_DoLog WARN "You are using plain kernel headers. You really shouldn't do that."

    CT_DoLog WARN "You'd be better off by using installed headers (or sanitised headers)."

    # 2.2 and 2.4 don't support building out-of-tree. 2.6 does.

    CT_DoLog EXTRA "Preparing kernel headers"

    case "${k_version}.${k_patchlevel}" in

        2.2|2.4) cd "${CT_SRC_DIR}/${CT_KERNEL_FILE}"

                 cp "${CT_KERNEL_LINUX_CONFIG_FILE}" .config

                 CT_DoYes "" |make ARCH=${CT_KERNEL_ARCH} oldconfig

                 # 2.4 doesn't follow V=# for verbosity... :-(

                 make ARCH=${CT_KERNEL_ARCH} symlinks include/linux/version.h

                 ;;

        2.6)     mkdir -p "${CT_BUILD_DIR}/build-kernel-headers"

                 cd "${CT_BUILD_DIR}/build-kernel-headers"

                 cp "${CT_KERNEL_LINUX_CONFIG_FILE}" .config

                 CT_DoYes "" |make -C "${CT_SRC_DIR}/${CT_KERNEL_FILE}"         \

                                   O=$(pwd) ${V_OPT} ARCH=${CT_KERNEL_ARCH}     \

                                   oldconfig

                 case "${CT_KERNEL_ARCH}" in

                     sh*)        # sh does secret stuff in 'make prepare' that can't be

                                 # triggered separately, but happily, it doesn't use

                                 # target gcc, so we can use it.

                                 # Update: this fails on 2.6.11, as it installs

                                 # elfconfig.h, which requires target compiler :-(

                                 make ${PARALLELMFLAGS}                 \

                                      ARCH=${CT_KERNEL_ARCH} ${V_OPT}   \

                                      prepare include/linux/version.h

                                 ;;

                     arm*|cris*) make ${PARALLELMFLAGS}                     \

                                      ARCH=${CT_KERNEL_ARCH} ${V_OPT}       \

                                      include/asm include/linux/version.h   \

                                      include/asm-${CT_KERNEL_ARCH}/.arch

                                 ;;

                     mips*)      # for linux-2.6, 'make prepare' for mips doesn't 

                                 # actually create any symlinks.  Hope generic is ok.

                                 # Note that glibc ignores all -I flags passed in CFLAGS,

                                 # so you have to use -isystem.

                                 make ${PARALLELMFLAGS}                 \

                                      ARCH=${CT_KERNEL_ARCH} ${V_OPT}   \

                                      include/asm include/linux/version.h

                                 TARGET_CFLAGS="${TARGET_CFLAGS} -isystem ${LINUX_HEADER_DIR}/include/asm-mips/mach-generic"

                                 ;;

                     *)          make ${PARALLELMFLAGS}                 \

                                      ARCH=${CT_KERNEL_ARCH} ${V_OPT}   \

                                      include/asm include/linux/version.h

                                 ;;

                 esac

                 ;;

    esac 2>&1 |CT_DoLog ALL

    CT_DoLog EXTRA "Copying kernel headers"

    cp -rv include/asm-generic "${CT_HEADERS_DIR}/asm-generic" 2>&1 |CT_DoLog ALL

    cp -rv include/linux "${CT_HEADERS_DIR}" 2>&1 |CT_DoLog ALL

    cp -rv include/asm-${CT_KERNEL_ARCH} "${CT_HEADERS_DIR}/asm" 2>&1 |CT_DoLog ALL

}

# Use preinstalled headers (most probably by using make headers_install in a

# modified (read: customised) kernel tree). In this case, simply copy

# the headers in place

do_kernel_preinstalled() {

    CT_DoLog EXTRA "Copying preinstalled kernel headers"

    mkdir -p "${CT_SYSROOT_DIR}/usr"

    cd "${CT_KERNEL_LINUX_HEADERS_CUSTOM_DIR}"

    cp -rv include "${CT_SYSROOT_DIR}/usr" 2>&1 |CT_DoLog ALL

}