# 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

CT_DoKernelTupleValues() {

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

        CT_TARGET_KERNEL="linux"

    else

        # Some no-mmu linux targets requires a -uclinux tuple (like m68k/cf),

        # while others must have a -linux tuple (like bfin).  Other targets

        # should be added here when someone starts to care about them.

        case "${CT_ARCH}" in

            blackfin)   CT_TARGET_KERNEL="linux" ;;

            m68k)       CT_TARGET_KERNEL="uclinux" ;;

            *)          CT_Abort "Unsupported no-mmu arch '${CT_ARCH}'"

        esac

    fi

}

# Download the kernel

do_kernel_get() {

    local k_ver

    local custom_name

    local rel_dir

    local korg_base mirror_base

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

        return 0

    fi

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

        CT_GetCustom "linux" "${CT_KERNEL_VERSION}"     \

                     "${CT_KERNEL_LINUX_CUSTOM_LOCATION}"

    else # Not a custom tarball

        case "${CT_KERNEL_VERSION}" in

            2.6.*.*|3.*.*)

                # 4-part versions (for 2.6 stables and long-terms), and

                # 3-part versions (for 3.x.y stables and long-terms),

                # we need to trash the last digit

                k_ver="${CT_KERNEL_VERSION%.*}"

                ;;

            2.6.*|3.*)

                # 3-part version (for 2.6.x initial releases), and 2-part

                # versions (for 3.x initial releases), use all of it

                k_ver="${CT_KERNEL_VERSION}"

                ;;

        esac

        case "${CT_KERNEL_VERSION}" in

            2.6.*)  rel_dir=v2.6;;

            3.*)    rel_dir=v3.x;;

        esac

        korg_base="http://ftp.kernel.org/pub/linux/kernel/${rel_dir}"

        CT_GetFile "linux-${CT_KERNEL_VERSION}"         \

                   "${korg_base}"                       \

                   "${korg_base}/longterm/v${k_ver}"    \

                   "${korg_base}/longterm"

    fi

}

# Extract kernel

do_kernel_extract() {

    # If using a custom headers tree, nothing to do

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

        return 0

    fi

    # If using a custom directory location, nothing to do

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

         -a -d "${CT_SRC_DIR}/linux-${CT_KERNEL_VERSION}" ]; then

        return 0

    fi

    # Otherwise, we're using either a mainstream tarball, or a custom

    # tarball; in either case, we need to extract

    CT_Extract "linux-${CT_KERNEL_VERSION}"

    # If using a custom tarball, no need to patch

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

        return 0

    fi

    CT_Patch "linux" "${CT_KERNEL_VERSION}"

}

# Wrapper to the actual headers install method

do_kernel_headers() {

    CT_DoStep INFO "Installing kernel headers"

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

        do_kernel_custom

    else

        do_kernel_install

    fi

    CT_EndStep

}

# Install kernel headers using headers_install from kernel sources.

do_kernel_install() {

    local kernel_path

    local kernel_arch

    CT_DoLog DEBUG "Using kernel's headers_install"

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

    kernel_path="${CT_SRC_DIR}/linux-${CT_KERNEL_VERSION}"

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

        kernel_path="${CT_SRC_DIR}/linux-custom"

    fi

    V_OPT="V=${CT_KERNEL_LINUX_VERBOSE_LEVEL}"

    kernel_arch="${CT_ARCH}"

    case "${CT_ARCH}:${CT_ARCH_BITNESS}" in

        # ARM 64 (aka AArch64) is special

        arm:64) kernel_arch="arm64";;

    esac

    CT_DoLog EXTRA "Installing kernel headers"

    CT_DoExecLog ALL                                    \

    make -C "${kernel_path}"                            \

         O="${CT_BUILD_DIR}/build-kernel-headers"       \

         ARCH=${kernel_arch}                            \

         INSTALL_HDR_PATH="${CT_SYSROOT_DIR}/usr"       \

         ${V_OPT}                                       \

         headers_install

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

        CT_DoLog EXTRA "Checking installed headers"

        CT_DoExecLog ALL                                    \

        make -C "${kernel_path}"                            \

             O="${CT_BUILD_DIR}/build-kernel-headers"       \

             ARCH=${kernel_arch}                            \

             INSTALL_HDR_PATH="${CT_SYSROOT_DIR}/usr"       \

             ${V_OPT}                                       \

             headers_check

    fi

    # Cleanup

    find "${CT_SYSROOT_DIR}" -type f                        \

                             \(    -name '.install'         \

                                -o -name '..install.cmd'    \

                                -o -name '.check'           \

                                -o -name '..check.cmd'      \

                             \)                             \

                             -exec rm {} \;

}

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

# modified (read: customised) kernel tree, or using pre-2.6.18 headers, such

# as 2.4). In this case, simply copy the headers in place

do_kernel_custom() {

    local tar_opt

    CT_DoLog EXTRA "Installing custom kernel headers"

    mkdir -p "${CT_SYSROOT_DIR}/usr"

    cd "${CT_SYSROOT_DIR}/usr"

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

        case "${CT_KERNEL_LINUX_CUSTOM_PATH}" in

            *.tar)      ;;

            *.tgz)      tar_opt=--gzip;;

            *.tar.gz)   tar_opt=--gzip;;

            *.tar.bz2)  tar_opt=--bzip2;;

            *.tar.xz)   tar_opt=--xz;;

        esac

        CT_DoExecLog ALL tar x ${tar_opt} -vf ${CT_KERNEL_LINUX_CUSTOM_PATH}

    else

        CT_DoExecLog ALL cp -rv "${CT_KERNEL_LINUX_CUSTOM_PATH}/include" .

    fi

}