#!/bin/sh

# my script to build my current kernel from scratch source
#
# start with kernel-source package installed in /usr/src
# hint:
#   upgradepkg --reinstall kernel-source-2.4.22-noarch-3.tgz
#   mv xfs-2.4.22 patches-2.4.22-not-applied
#   gzip -9 2.4.22.nat.diff; mv 2.4.22.nat.diff.gz patches-2.4.22

KVER=2.4.22
PLVL=ac2

cd /usr/src

if [ "$1" != "--package-only" ]; then \
shift

# patch kernel up to alan cox-2 (shouldn't be an old ac2 directory here)
(cd linux-$KVER; zcat ../patches-$KVER/patch-$KVER-$PLVL.gz \
 | patch -p1)
mv linux-$KVER linux-$KVER-$PLVL

# cp ACPI dsdt.hex into /tmp and apply Mike Hardy's Dell D-800 patch
zcat patches-$KVER/dsdt.hex.gz > /tmp/dsdt.hex
(cd linux-$KVER-$PLVL; zcat ../patches-$KVER/osl.diff.gz |patch -p2)

# apply slackware patch (only one except xfs filesystem stuff)
# -- This appears to have been already patched by ac2 ? --
#(cd linux-$KVER-$PLVL; \
# zcat ../patches-$KVER/2.4.22.nat.diff.gz |patch -p1)

# apply patch to orinoco_cs modules that allows scanning
# (makefile patch will fail, but it looks like all they did was add
#   -fno-strict-aliasing to CFLAGS and this appears to be on already
(cd linux-$KVER-$PLVL/drivers/net/wireless; \
 zcat ../../../../patches-$KVER/scanning-0.13d-v3.diff.gz|patch )

# apply patch for hostap drivers (allow prism card to act as access point)
(cd linux-$KVER-$PLVL; \
 zcat ../patches-$KVER/hostap-linux-2.4.20.patch.gz |patch -p1 )
(cd linux-$KVER-$PLVL; \
 tar zxvf ../drivers/hostap/hostap-drivers-0.0.4.tgz )

# copy last config into this dir
cp config linux-$KVER-$PLVL/.config
(cd linux-$KVER-$PLVL; make oldconfig)

# make dependencies
(cd linux-$KVER-$PLVL; make dep)

# Question: what are good CFLAGS for compiling kernel?
# seems like arch=i686 would be good (current looks like -O2 -march=i586)

# ready to rock and roll
(cd linux-$KVER-$PLVL; make clean)
(cd linux-$KVER-$PLVL; make bzImage > make.log 2>&1)
(cd linux-$KVER-$PLVL; make modules > make-modules.log 2>&1)

# make broadcomm module
ln -fs linux-$KVER-$PLVL linux
(cd /usr/src/drivers/bcm5700/6.2.17/Server/Linux/Driver/src; make )

fi

# make kernel package in temp directory
rm -fr tmp1
mkdir -p tmp1/boot/$KVER-$PLVL
cp linux-$KVER-$PLVL/arch/i386/boot/bzImage tmp1/boot/$KVER-$PLVL
cp linux-$KVER-$PLVL/System.map tmp1/boot/$KVER-$PLVL
gzip -9 tmp1/boot/$KVER-$PLVL/System.map
cp linux-$KVER-$PLVL/.config tmp1/boot/$KVER-$PLVL/config
mkdir -p tmp1/install
thisuser=`whoami`
thishost=`hostname`
thisdate=`date`
thisgcc=`gcc -v 2>&1 |tail -1`
cat > tmp1/install/slack-desc <<EOF
kernel-custom: kernel-custom (custom kernel linux-$KVER-$PLVL)
kernel-custom:
kernel-custom: This kernel was compiled for this machine
kernel-custom: by $thisuser@$thishost on $thisdate
kernel-custom: using $thisgcc.
kernel-custom:

EOF
(cd tmp1; makepkg -l y -c y "../kernel-custom-$KVER$PLVL-i586-1.tgz")

cp linux-$KVER-$PLVL/.config config

# Install the modules into another tmp directory
rm -fr tmp2
mkdir -p tmp2/lib/modules/$KVER-$PLVL
( cd linux-$KVER-$PLVL; \
  make modules_install INSTALL_MOD_PATH=/usr/src/tmp2 )

mkdir -p tmp2/install
cat > tmp2/install/slack-desc <<EOF
kernel-modules-custom: kernel-modules-custom (for linux-$KVER-$PLVL)
kernel-modules-custom:
kernel-modules-custom: Kernel modules compiled for linux-$KVER-$PLVL
kernel-modules-custom: by $thisuser@$thishost on $thisdate
kernel-modules-custom: using $thisgcc.
kernel-modules-custom:

EOF
cat > tmp2/install/doinst.sh <<EOF
#!/bin/sh
depmod -a
EOF

# copy broadcomm driver too
mkdir -p tmp2/lib/modules/$KVER-$PLVL/kernel/drivers/addon/net
(cd /usr/src/drivers/bcm5700/src; \
 cp bcm5700.o /usr/src/tmp2/lib/modules/$KVER-$PLVL/kernel/drivers/addon/net )

# copy in nvidia modules from current installation
mkdir tmp2/lib/modules/$KVER-$PLVL/kernel/drivers/addon/video
cp /lib/modules/$KVER-$PLVL/kernel/drivers/addon/video/nvidia.o \
  tmp2/lib/modules/$KVER-$PLVL/kernel/drivers/addon/video

(cd tmp2; makepkg -l y -c y "../kernel-custom-modules-$KVER$PLVL-i586-1.tgz")

# Tell the user some reminders
cat > bootsector.hint <<EOF


 You will need to run lilo after installing a new kernel.
 Make sure you've added a stanza for your new kernel in /etc/lilo.conf:
   image = /boot/$KVER-$PLVL/bzImage
   label = $KVER$PLVL
 And run lilo to write the boot sector to our /boot partition.

 Then, copy the boot sector to a file in your shared directory
   dd if=/dev/hda2 of=/export/d/boothda2.ldr.incoming bs=512 count=1

 Then, boot to Windows and copy the boot sector to where our
 NT bootloader expects it
   copy D:\boothda2.ldr.incoming C:\boothda2.ldr

EOF

cat bootsector.hint

# remake nvidia driver
cat > nvidia.hint <<EOF

 You'll also have to remake your nvidia video driver
 because its proprietary code and not in the kernel.

 To do this: 
    (cd /usr/src/drivers/nvidia; \ 
    sh NVIDIA-Linux-x86-1.0-4496-pkg2.run )
    mkdir -p /lib/modules/$KVER-$PLVL/kernel/drivers/addon/video/
    cp /lib/modules/$KVER-$PLVL/kernel/drivers/video/nvidia.o \ 
      /lib/modules/$KVER-$PLVL/kernel/drivers/addon/video/nvidia.o

EOF

cat nvidia.hint

# rm -r tmp1 tmp2