# Copyright 1999-2003 Gentoo Technologies, Inc.
# Distributed under the terms of the GNU General Public License v2
# $Header: 

#IUSE="build supermount xfs acpi nforce2 bootsplash swapprefetch freqscal grsec aavm rmap pcmcia"
IUSE="build supermount xfs acpi nforce2 bootsplash swapprefetch freqscal rmap  aavm pcmcia"

ETYPE="sources"
inherit kernel || die

# OKV=original kernel version, KV=patched kernel version.
OKV="2.4.21"
KV="2.4.21-ck${PR/r/}"
S=${WORKDIR}/linux-${KV}
EXTRAVERSION="-ck${PR/r/}"

DESCRIPTION="Full sources for the Con Kolivas's high performance kernel and its optional features"
HOMEPAGE="http://members.optusnet.com.au/ckolivas/kernel"

### Below is a list of all the available patches:

## Performance enhancements (installed by default):
# Base ck contains the batch O(1) scheduler, preemptible, low latency:
# (this version is 
BASE_PATCH="1000_O1_PE_LL_0306190109_${OKV}.patch.bz2"
# Con Colivas autoregulation vm hacks:
# (will be dropped if "aavm" or "rmap" is in USE)
CKVM_PATCH="1010_CKVM_0306130018_${KV}.patch.bz2"
# Read Latency2:
RL2="1020_RL2_0305310042_${KV}.patch.bz2"
# Desktop Tuning 1:
DT1_PATCH="1021_DT1_030531616_${KV}.patch.bz2"
# Variable HZ setting:
# USE!=pcmcia (global)
VH_PATCH="1030_VH_0305310045_${KV}.patch.bz2"
# Desktop Tuning 2:
# USE!=pcmcia (global)
DT2_PATCH="1031_DT2_0305310048_${KV}.patch.bz2"
# Scheduler Tunables:
ST_PATCH="1040_ST_030619_${KV}.patch.bz2"

## Extra features:
# Supermount-NG v1.2.7:
# USE=supermount (local)
SM_PATCH="1050_SM1.2.7_0305310109_${KV}.patch.bz2"
# XFS file system:
# USE=xfs (local, but already used in gentoo-sources)
XFS_PATCH="1060_XFS1.3.0pre2_0306172109_${KV}.patch.bz2"
# ACPI 20030522:
# USE=acpi (global - should use "acpi4linux"?)
ACPI_PATCH="1070_ACPI_0305311044_${KV}.patch.bz2"
# Nvidia Nforce2 update:
# USE=nforce2 (local)
NF2_PATCH="1080_NF2_0305311048_${KV}.patch.bz2"
# Bootsplash:
# USE=bootsplash (local)
BS_PATCH="1090_BS_0306020027_${KV}.patch.bz2"

## Misc other patches:
# Swap prefetching:
# USE=swapprefetch (local) and USE!=rmap (local)
SP_PATCH="1011_SP_0306102217_${KV}.diff.bz2"
# CPU Frequency scaling for supported laptops:
# USE=freqscal (local)
CFS_PATCH="1100_CFS_0306161356_${KV}.patch.bz2"
# Grsec 1.9.9h (depends on 1010 and 1060): 
# USE=grsec (local) -- not available yet --
#GRS_PATCH="1161_GRS1.9.9h_0306081216_${KV}.patch.bz2"

## Alternative VMs:
# AAVM: 
# USE=aavm (local) 
AAVM_PATCH="1010_AAVM_030619_${KV}.patch.bz2"
# Rmap:
# USE=rmap (local)
RMAP_PATCH="1010_rmap15j_0306172008_${KV}.patch.bz2"


### Create the SRC_URI from USE flags.
CK_URL="http://members.optusnet.com.au/ckolivas/kernel"
TGL_URL="http://tdegreni.free.fr/gentoo"
SRC_URI="http://www.kernel.org/pub/linux/kernel/v2.4/linux-${OKV}.tar.bz2 \
		${CK_URL}/${BASE_PATCH} \
		${CK_URL}/${CKVM_PATCH} \
		${CK_URL}/${RL2} \
		${CK_URL}/${DT1_PATCH} \
		${CK_URL}/${VH_PATCH} \
		${CK_URL}/${DT2_PATCH} \
		${TGL_URL}/${ST_PATCH} \
		supermount? ( ${CK_URL}/${SM_PATCH} ) \
		xfs? ( ${CK_URL}/${XFS_PATCH} ) \
		acpi? ( ${CK_URL}/${ACPI_PATCH} ) \
		nforce2? ( ${CK_URL}/${NF2_PATCH} ) \
		bootsplash? ( ${CK_URL}/${BS_PATCH} ) \
		swapprefetch? ( ${CK_URL}/${SP_PATCH} ) \
		freqscal? ( ${CK_URL}/${CFS_PATCH} ) \
		rmap? ( ${CK_URL}/${RMAP_PATCH} ) \
		aavm? ( ${TGL_URL}/${AAVM_PATCH} )"
#GRSEC		grsec? ( ${CK_URL}/${XFS_PATCH} ) 
#GRSEC		grsec? ( ${CK_URL}/${GRS_PATCH} ) 

KEYWORDS="~x86 -ppc"
SLOT="${KV}"

src_unpack() {
	
	# Check for conflicts without obvious default choice:
	[ -n "`use rmap`" -a -n "`use xfs`" ] && \
	  die "Sorry, XFS and Rmap patches currently conflict."
#GRSEC	[ -n "`use rmap`" -a -n "`use grsec`" ] && \
#GRSEC	  die "Sorry, Grsecurity needs XFS, which currently conflict with Rmap patch."
	[ -n "`use rmap`" -a -n "`use aavm`" ] && \
	  die "You'll have to choose between AAVM and Rmap."
	
	# Warnings about missing patches:
	[ -n "`use grsec`" ] && ewarn "Sorry, Grsecurity patch is not available yet."
	
	# Symlink the main separate patches:
	for PATCH in ${BASE_PATCH} ${CKVM_PATCH} ${RL2} ${DT1_PATCH} ${ST_PATCH} 
	do
		ln -s ${DISTDIR}/${PATCH} || die
	done
	if [ -n "`use pcmcia`" ]; then
	  ewarn "PCMCIA is in use: \"Variable HZ setting\" and \"Desktop Tuning 2\" disabled."
	else	  
	  ( ln -s ${DISTDIR}/${VH_PATCH} || die )
	  ( ln -s ${DISTDIR}/${DT2_PATCH} || die )
	fi
	
	# Symlink optional patches:
	[ -n "`use supermount`" ] && ( ln -s ${DISTDIR}/${SM_PATCH} || die )
#GRSEC	[ -n "`use xfs`" -o -n "`use grsec`" ] && ( ln -s ${DISTDIR}/${XFS_PATCH} || die )
	[ -n "`use xfs`" ] && ( ln -s ${DISTDIR}/${XFS_PATCH} || die )
	[ -n "`use acpi`" ] && ( ln -s ${DISTDIR}/${ACPI_PATCH} || die )
	[ -n "`use nforce2`" ] && ( ln -s ${DISTDIR}/${NF2_PATCH} || die )
	[ -n "`use bootsplash`" ] && ( ln -s ${DISTDIR}/${BS_PATCH} || die )
	[ -n "`use swapprefetch`" ] && \
		if [ -n "`use rmap`" -o -n "`use aavm`" ]; then
			ewarn "A non-CKVM is in use: \"Swap prefetching\" disabled." 
		else
			( ln -s ${DISTDIR}/${SP_PATCH} || die )
		fi
	[ -n "`use freqscal`" ] && ( ln -s ${DISTDIR}/${CFS_PATCH} || die )
#GRSEC	[ -n "`use grsec`" ] && ( ln -s ${DISTDIR}/${GRS_PATCH} || die )
	[ -n "`use rmap`" ] && ( ln -s ${DISTDIR}/${RMAP_PATCH} && rm -f ${CKVM_PATCH} || die )
	[ -n "`use aavm`" ] && ( ln -s ${DISTDIR}/${AAVM_PATCH} && rm -f ${CKVM_PATCH} || die )

	# Unpack the vanilla sources
	unpack linux-${OKV}.tar.bz2
	
	# Apply the extra symlinked patches. (-p1)
	cd linux-${OKV}
	for PATCH in ../1*
	do
		einfo "Apply patch ${PATCH/\.\.\//}"
		bzcat ${PATCH} | patch -p1 || die "Patching with ${PATCH/\.\.\//} failed."
	done
	cd ..

	# Rename the kernel
	mv linux-${OKV} linux-${KV} || die
	
	# Do the usual cleanups
	cd linux-${KV}
	kernel_universal_unpack
}