86 lines
2.5 KiB
Bash
86 lines
2.5 KiB
Bash
#!/bin/ksh
|
|
|
|
#
|
|
# File: patchfreq
|
|
# Author: Bryan Cantrill (bmc@eng.sun.com), Solaris Performance
|
|
# Modified: Sat Apr 26 04:00:59 PDT 1997
|
|
#
|
|
# This is a little script to patch a 5.5 or 5.5.1 kernel to get around
|
|
# the cpu_tick_freq inaccuracy. Before running this script, one must
|
|
# know the true frequency of one's CPU; this can be derived by NTP,
|
|
# or by observing the clock relative to the time-of-day chip over a
|
|
# long period of time (the TOD will pull system time when it drifts
|
|
# by more than two seconds).
|
|
#
|
|
# Patching a kernel can render a machine unbootable; do not run this
|
|
# script unless you are prepared to accept that possibility. It
|
|
# is advisable to have a backout path (e.g. net booting, an alternate
|
|
# boot disk, an installation CD) should your machine fail to boot.
|
|
#
|
|
# This is not a product of Sun Microsystems, and is provided "as is",
|
|
# without warranty of any kind expressed or implied including, but not
|
|
# limited to, the suitability of this script for any purpose.
|
|
#
|
|
|
|
if [ $# -eq 0 ]; then
|
|
echo "Usage: $0 cpu_tick_freq [ alternate_kernel ]"
|
|
exit 1
|
|
fi
|
|
|
|
cpu_tick_freq=$1
|
|
kernel=/platform/sun4u/kernel/unix
|
|
|
|
if [ $# -eq 2 ]; then
|
|
kernel=$2
|
|
fi
|
|
|
|
if [ ! -w $kernel ]; then
|
|
echo "$0: Cannot open $kernel for writing."
|
|
exit 1
|
|
fi
|
|
|
|
arch=`echo utsname+404?s | adb $kernel | cut -d: -f2`
|
|
|
|
if [ ! $arch = "sun4u" ]; then
|
|
echo "Patch only applies to sun4u"
|
|
exit 1
|
|
fi
|
|
|
|
rel=`echo utsname+202?s | adb $kernel | cut -d: -f2`
|
|
|
|
if [ ! $rel = "5.5" ] && [ ! $rel = "5.5.1" ]; then
|
|
echo "Patch only applies to 5.5 or 5.5.1..."
|
|
exit 1
|
|
fi
|
|
|
|
nop="1000000" # nop
|
|
store_mask="ffffe000" # mask out low 13 bits
|
|
store="da256000" # st %o5, [%l5 + offset]
|
|
|
|
instr=`echo setcpudelay+34?X | adb $kernel | cut -d: -f 2 | nawk '{ print $1 }'`
|
|
|
|
if [ $instr = $nop ]; then
|
|
echo "Instruction already patched..."
|
|
else
|
|
let masked="(16#$store_mask & 16#$instr) - 16#$store"
|
|
if [ $masked -ne 0 ]; then
|
|
echo "Couldn't find instruction to patch; aborting."
|
|
exit 1
|
|
fi
|
|
|
|
if ! echo setcpudelay+34?W $nop | adb -w $kernel 1> /dev/null
|
|
then
|
|
echo "adb returned an unexpected error; aborting."
|
|
fi
|
|
fi
|
|
|
|
echo "Patching cpu_tick_freq to $cpu_tick_freq..."
|
|
|
|
if ! echo cpu_tick_freq?W 0t$cpu_tick_freq | adb -w $kernel 1> /dev/null; then
|
|
echo "adb returned an unexpected error; aborting."
|
|
exit 1
|
|
fi
|
|
|
|
echo "$kernel successfully patched."
|
|
exit 0
|