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Diffstat (limited to 'scripts/gen-compat-autoconf.sh')
| -rwxr-xr-x | scripts/gen-compat-autoconf.sh | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/scripts/gen-compat-autoconf.sh b/scripts/gen-compat-autoconf.sh new file mode 100755 index 00000000..3ddf8df7 --- /dev/null +++ b/scripts/gen-compat-autoconf.sh @@ -0,0 +1,194 @@ +#!/bin/bash +# +# Copyright 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu> +# +# Use this to parse a small .config equivalent looking file to generate +# our own autoconf.h. This file has defines for each config option +# just like the kernels include/linux/autoconf.h +# +# XXX: consider using scripts/kconfig/confdata.c instead. +# On the downside this would require the user to have libc though. + +# This indicates which is the oldest kernel we support +# Update this if you are adding support for older kernels. +OLDEST_KERNEL_SUPPORTED="2.6.27" +COMPAT_RELEASE="compat-release" +KERNEL_RELEASE="git-describe" +MULT_DEP_FILE=".compat_pivot_dep" + +if [ $# -ne 1 ]; then + echo "Usage $0 config-file" + exit +fi + +COMPAT_CONFIG="$1" + +if [ ! -f $COMPAT_CONFIG ]; then + echo "File $1 is not a file" + exit +fi + +if [ ! -f $COMPAT_RELEASE -o ! -f $KERNEL_RELEASE ]; then + echo "Error: $COMPAT_RELEASE or $KERNEL_RELEASE file is missing" + exit +fi + +CREL=$(cat $COMPAT_RELEASE) +KREL=$(cat $KERNEL_RELEASE) +DATE=$(date) + +# Defines a CONFIG_ option if not defined yet, this helps respect +# linux/autoconf.h +function define_config { + VAR=$1 + VALUE=$2 + echo "#ifndef $VAR" + case $VALUE in + n) # Do nothing + ;; + y) + echo "#define $VAR 1" + ;; + m) + echo "#define $VAR 1" + ;; + *) # Assume string + # XXX: add better checks to make sure what was on + # the right was indeed a string + echo "#define $VAR \"$VALUE\"" + ;; + esac + echo "#endif /* $VAR */ " +} + +# This deals with core compat-wireless kernel requirements. +function define_config_req { + VAR=$1 + echo "#ifndef $VAR" + echo -n "#error Compat-wireless requirement: $VAR must be enabled " + echo "in your kernel" + echo "#endif /* $VAR */" +} + +# This handles modules which have dependencies from the kernel +# which compat-wireless isn't providing yet either because +# the dependency is not available as kernel module or +# the module simply isn't provided by compat-wireless. +function define_config_dep { + VAR=$1 + VALUE=$2 + DEP=$3 + WARN_VAR="COMPAT_WARN_$VAR" + echo "#ifdef $DEP" + define_config $VAR $VALUE + echo "#else" + # XXX: figure out a way to warn only once + # define only once in case user tried to enable config option + # twice in config.mk + echo "#ifndef $WARN_VAR" + # Lets skip these for now.. they might be too annoying + #echo "#warning Skipping $VAR as $DEP was needed... " + #echo "#warning This just means $VAR won't be built and is not fatal." + echo "#define $WARN_VAR" + echo "#endif /* $VAR */" + echo "#endif /* $WARN_VAR */" +} + +# This handles options which have *multiple* dependencies from the kernel +function define_config_multiple_deps { + VAR=$1 + VALUE=$2 + DEP_ARRAY=$3 + + # First, put all ifdefs + for i in $(cat $MULT_DEP_FILE); do + echo "#ifdef $i" + done + + # Now put our option in the middle + define_config $VAR $VALUE + + # Now close all ifdefs + # First, put all ifdefs + for i in $(cat $MULT_DEP_FILE); do + echo "#endif" + done + +} + +function kernel_version_req { + VERSION=$(echo $1 | sed -e 's/\./,/g') + echo "#if (LINUX_VERSION_CODE < KERNEL_VERSION($VERSION))" + echo "#error Compat-wireless requirement: Linux >= $VERSION" + echo "#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION($VERSION) */ " +} + +cat <<EOF +#ifndef COMPAT_AUTOCONF_INCLUDED +#define COMPAT_AUTOCONF_INCLUDED +/* + * Automatically generated C config: don't edit + * $DATE + * compat-wireless-2.6: $CREL + * linux-2.6: $KREL + */ +#define COMPAT_RELEASE "$CREL" +#define COMPAT_KERNEL_RELEASE "$KREL" +EOF + +# Checks user is compiling against a kernel we support +kernel_version_req $OLDEST_KERNEL_SUPPORTED + +# Handle core kernel wireless depenencies here +define_config_req CONFIG_WIRELESS_EXT + +# For each CONFIG_FOO=x option +for i in $(grep '^CONFIG_' $COMPAT_CONFIG); do + # Get the element on the left of the "=" + VAR=$(echo $i | cut -d"=" -f 1) + # Get the element on the right of the "=" + VALUE=$(echo $i | cut -d"=" -f 2) + + # skip vars that weren't actually set due to dependencies + #if [ "${!VAR}" = "" ] ; then + # continue + #fi + + # Handle core kernel module depenencies here. + case $VAR in + CONFIG_USB_NET_RNDIS_WLAN) + define_config_dep $VAR $VALUE CONFIG_USB_NET_CDCETHER + continue + ;; + CONFIG_USB_NET_RNDIS_HOST) + define_config_dep $VAR $VALUE CONFIG_USB_NET_CDCETHER + continue + ;; + # ignore this, we have a special hanlder for this at the botttom + # instead. We still need to keep this in config.mk to let Makefiles + # know its enabled so just ignore it here. + CONFIG_MAC80211_QOS) + continue + ;; + esac + # Any other module which can *definitely* be built as a module goes here + define_config $VAR $VALUE +done + +# Deal with special cases. CONFIG_MAC80211_QOS is such a case. +# We handle this specially for different kernels we support. +if [ -f $KLIB_BUILD/Makefile ]; then + SUBLEVEL=$(make -C $KLIB_BUILD kernelversion | sed -n 's/^2\.6\.\([0-9]\+\).*/\1/p') + if [ $SUBLEVEL -le 22 ]; then + define_config CONFIG_MAC80211_QOS y + else # kernel >= 2.6.23 + # CONFIG_MAC80211_QOS on these kernels requires + # CONFIG_NET_SCHED and CONFIG_NETDEVICES_MULTIQUEUE + rm -f $MULT_DEP_FILE + echo CONFIG_NET_SCHED >> $MULT_DEP_FILE + echo CONFIG_NETDEVICES_MULTIQUEUE >> $MULT_DEP_FILE + define_config_multiple_deps CONFIG_MAC80211_QOS y $ALL_DEPS + rm -f $MULT_DEP_FILE + fi +fi +echo "#endif /* COMPAT_AUTOCONF_INCLUDED */" |