xref: /openbmc/openpower-pnor-code-mgmt/mmc/obmc-flash-bios (revision b9d864914c78667e83dc5e27ac7f8ee94c54be8b)

#!/bin/sh

bios_reset_if_needed() {
    resetval=$(fw_printenv -n rwreset 2>/dev/nell)
    if [ "$resetval" = "0" ] || [ "$resetval" = "1" ]; then
        varstore="/media/hostfw/reset-gpio-val"
        if [ -f "$varstore" ]; then
            if [ "$resetval" != "$(cat $varstore)" ]; then
                if busctl call org.open_power.Software.Host.Updater /xyz/openbmc_project/software xyz.openbmc_project.Common.FactoryReset Reset; then
                    echo "$resetval" > "$varstore"
                fi
            fi
        else
            echo "$resetval" > "$varstore"
        fi
    fi
}

mmc_get_primary_label() {
    # Get root device /dev/mmcblkpX
    rootmatch=" on / "
    root="$(mount | grep "${rootmatch}")"
    # shellcheck disable=SC2295
    root="${root%${rootmatch}*}"

    # Find the device label
    if [ "$(readlink -f /dev/disk/by-partlabel/rofs-a)" = "${root}" ]; then
        echo "a"
    elif [ "$(readlink -f /dev/disk/by-partlabel/rofs-b)" = "${root}" ]; then
        echo "b"
    else
        echo ""
    fi
}

mmc_init() {
    base_dir="/media/hostfw"
    ro_dir="${base_dir}/running-ro"
    running_dir="${base_dir}/running"
    prsv_dir="${base_dir}/prsv"
    staging_dir="${base_dir}/staging"
    nvram_dir="${base_dir}/nvram"

    if [ ! -d "${ro_dir}" ]; then
        mkdir -p "${ro_dir}"
    fi
    if [ ! -d "${running_dir}" ]; then
        mkdir -p ${running_dir}
    fi
    if [ ! -d "${prsv_dir}" ]; then
        mkdir -p "${prsv_dir}"
    fi
    if [ ! -d "${staging_dir}" ]; then
        mkdir -p "${staging_dir}"
    fi
    if [ ! -d "${nvram_dir}" ]; then
        mkdir -p "${nvram_dir}"
    fi

    # Mount the image that corresponds to the boot label as read-only to be used
    # to populate the running directory.
    boot_label="$(mmc_get_primary_label)"
    if ! grep -q "${ro_dir}" /proc/mounts; then
        mount ${base_dir}/hostfw-"${boot_label}" ${ro_dir} -o ro
    fi

    # Determine if the running dir contains the running version
    running_label=""
    running_label_file="${running_dir}/partlabel"
    if [ -f "${running_label_file}" ]; then
        running_label=$(cat ${running_label_file})
    fi
    if [ "${running_label}" != "${boot_label}" ]; then
        # Copy off the preserved partitions
        # A line in the pnor.toc (81e00994.lid) looks like this:
        # partition05=SECBOOT,0x00381000,0x003a5000,00,ECC,PRESERVED
        rm -f ${prsv_dir}/*
        if [ -f "${ro_dir}/81e00994.lid" ]; then
            prsvs=$(grep PRESERVED "${ro_dir}/81e00994.lid")
            for prsv in ${prsvs}; do
                prsv=${prsv##partition*=}
                prsv=$(echo "${prsv}" | cut -d "," -f 1)
                if [ -L "${running_dir}/${prsv}" ]; then
                    # Preserve the symlink target file
                    prsv="$(readlink "${running_dir}/${prsv}")"
                    if [ -f "${running_dir}/${prsv}" ] && [ -f "${ro_dir}/${prsv}" ]; then
                        runsize="$(stat -c '%s' "${running_dir}/${prsv}")"
                        rosize="$(stat -c '%s' "${ro_dir}/${prsv}")"
                        if [ "$runsize" != "$rosize" ]; then
                            # Partition size may have changed or became corrupted
                            # So it will not be copied to the preserved directory
                            # Log PEL to indicate such
                            busctl call xyz.openbmc_project.Logging \
                                /xyz/openbmc_project/logging \
                                xyz.openbmc_project.Logging.Create Create "ssa{ss}" \
                                xyz.openbmc_project.Software.Version.Error.HostFile \
                                xyz.openbmc_project.Logging.Entry.Level.Error 3 "FILE_NAME" \
                                "${prsv}" "CURRENT_FILE_SIZE" "${runsize}" "EXPECTED_FILE_SIZE" \
                                "${rosize}"
                            # Initiate dump
                            busctl call xyz.openbmc_project.Dump.Manager \
                                /xyz/openbmc_project/dump/bmc xyz.openbmc_project.Dump.Create \
                                CreateDump "a{sv}" 0
                        else
                            cp -p ${running_dir}/"${prsv}" ${prsv_dir}
                        fi
                    fi
                fi
            done
        fi

        # Copy lid contents of running image to running dir
        rm -f ${running_dir}/*
        cp -p ${ro_dir}/*.lid ${running_dir}/

        # Restore the preserved partitions. Ignore error, there may be none.
        cp -p ${prsv_dir}/* ${running_dir}/ 2>/dev/null || true
        rm -f "${prsv_dir:?}/"*

        # Clean up the staging dir in case of a failed update
        rm -rf "${staging_dir:?}/"*

        # Save the label
        echo "${boot_label}" > "${running_label_file}"

    fi

    # Mount alternate dir
    if [ "${boot_label}" = "a" ]; then
        alternate_label="b"
    else
        alternate_label="a"
    fi
    alternate_dir="${base_dir}/alternate"
    if [ ! -d "${alternate_dir}" ]; then
        mkdir -p ${alternate_dir}
    fi
    if ! grep -q "${alternate_dir}" /proc/mounts; then
        mount ${base_dir}/hostfw-${alternate_label} ${alternate_dir} -o ro
    fi
}

mmc_patch() {
    # Patching is disabled if field mode is set
    if [ "$(fw_printenv fieldmode 2>/dev/null)" = "fieldmode=true" ]; then
        return 0
    fi

    boot_label="$(mmc_get_primary_label)"
    if [ "${boot_label}" = "a" ]; then
        alternate_label="b"
    else
        alternate_label="a"
    fi

    # Create patch directories
    patch_dir="/media/hostfw/patch-"
    running_patch_dir="${patch_dir}${boot_label}"
    if [ ! -d "${running_patch_dir}" ]; then
        mkdir -p "${running_patch_dir}"
    fi
    alternate_patch_dir="${patch_dir}${alternate_label}"
    if [ ! -d "${alternate_patch_dir}" ]; then
        mkdir -p "${alternate_patch_dir}"
    fi

    # Create patch symlinks
    symlink_base="/usr/local/share"
    if [ ! -d "${symlink_base}" ]; then
        mkdir -p "${symlink_base}"
    fi
    hostfw_symlink_base="${symlink_base}/hostfw"
    if [ ! -d "${hostfw_symlink_base}" ]; then
        mkdir -p "${hostfw_symlink_base}"
    fi

    if [ "$(readlink -f "${symlink_base}/pnor")" != "${running_patch_dir}" ]; then
        ln -s "${running_patch_dir}" "${symlink_base}/pnor"
    fi
    if [ "$(readlink -f "${hostfw_symlink_base}/running")" != "${running_patch_dir}" ]; then
        ln -s "${running_patch_dir}" "${hostfw_symlink_base}/running"
    fi
    if [ "$(readlink -f "${hostfw_symlink_base}/alternate")" != "${alternate_patch_dir}" ]; then
        ln -s "${alternate_patch_dir}" "${hostfw_symlink_base}/alternate"
    fi
}

case "$1" in
    bios-reset-if-needed)
        bios_reset_if_needed
        ;;
    mmc-init)
        mmc_init
        ;;
    mmc-patch)
        mmc_patch
        ;;
    *)
        echo "Invalid argument: $1" >&2
        exit 1
        ;;
esac