1#!/bin/ksh 2 3# 4# File: patchfreq 5# Author: Bryan Cantrill (bmc@eng.sun.com), Solaris Performance 6# Modified: Sat Apr 26 04:00:59 PDT 1997 7# 8# This is a little script to patch a 5.5 or 5.5.1 kernel to get around 9# the cpu_tick_freq inaccuracy. Before running this script, one must 10# know the true frequency of one's CPU; this can be derived by NTP, 11# or by observing the clock relative to the time-of-day chip over a 12# long period of time (the TOD will pull system time when it drifts 13# by more than two seconds). 14# 15# Patching a kernel can render a machine unbootable; do not run this 16# script unless you are prepared to accept that possibility. It 17# is advisable to have a backout path (e.g. net booting, an alternate 18# boot disk, an installation CD) should your machine fail to boot. 19# 20# This is not a product of Sun Microsystems, and is provided "as is", 21# without warranty of any kind expressed or implied including, but not 22# limited to, the suitability of this script for any purpose. 23# 24 25if [ $# -eq 0 ]; then 26 echo "Usage: $0 cpu_tick_freq [ alternate_kernel ]" 27 exit 1 28fi 29 30cpu_tick_freq=$1 31kernel=/platform/sun4u/kernel/unix 32 33if [ $# -eq 2 ]; then 34 kernel=$2 35fi 36 37if [ ! -w $kernel ]; then 38 echo "$0: Cannot open $kernel for writing." 39 exit 1 40fi 41 42arch=`echo utsname+404?s | adb $kernel | cut -d: -f2` 43 44if [ ! $arch = "sun4u" ]; then 45 echo "Patch only applies to sun4u" 46 exit 1 47fi 48 49rel=`echo utsname+202?s | adb $kernel | cut -d: -f2` 50 51if [ ! $rel = "5.5" ] && [ ! $rel = "5.5.1" ]; then 52 echo "Patch only applies to 5.5 or 5.5.1..." 53 exit 1 54fi 55 56nop="1000000" # nop 57store_mask="ffffe000" # mask out low 13 bits 58store="da256000" # st %o5, [%l5 + offset] 59 60instr=`echo setcpudelay+34?X | adb $kernel | cut -d: -f 2 | nawk '{ print $1 }'` 61 62if [ $instr = $nop ]; then 63 echo "Instruction already patched..." 64else 65 let masked="(16#$store_mask & 16#$instr) - 16#$store" 66 if [ $masked -ne 0 ]; then 67 echo "Couldn't find instruction to patch; aborting." 68 exit 1 69 fi 70 71 if ! echo setcpudelay+34?W $nop | adb -w $kernel 1> /dev/null 72 then 73 echo "adb returned an unexpected error; aborting." 74 fi 75fi 76 77echo "Patching cpu_tick_freq to $cpu_tick_freq..." 78 79if ! echo cpu_tick_freq?W 0t$cpu_tick_freq | adb -w $kernel 1> /dev/null; then 80 echo "adb returned an unexpected error; aborting." 81 exit 1 82fi 83 84echo "$kernel successfully patched." 85exit 0 86