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ntp 4.2.6p5

    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: 
   25: if [ $# -eq 0 ]; then
   26:         echo "Usage:  $0 cpu_tick_freq [ alternate_kernel ]"
   27:         exit 1
   28: fi
   29: 
   30: cpu_tick_freq=$1
   31: kernel=/platform/sun4u/kernel/unix
   32: 
   33: if [ $# -eq 2 ]; then
   34:         kernel=$2
   35: fi
   36: 
   37: if [ ! -w $kernel ]; then
   38:         echo "$0:  Cannot open $kernel for writing."
   39:         exit 1
   40: fi
   41: 
   42: arch=`echo utsname+404?s | adb $kernel | cut -d: -f2`
   43: 
   44: if [ ! $arch = "sun4u" ]; then
   45:         echo "Patch only applies to sun4u"
   46:         exit 1
   47: fi
   48: 
   49: rel=`echo utsname+202?s | adb $kernel | cut -d: -f2`
   50: 
   51: if [ ! $rel = "5.5" ] && [ ! $rel = "5.5.1" ]; then
   52:         echo "Patch only applies to 5.5 or 5.5.1..."
   53:         exit 1
   54: fi
   55: 
   56: nop="1000000"           # nop
   57: store_mask="ffffe000"   # mask out low 13 bits
   58: store="da256000"        # st      %o5, [%l5 + offset]
   59: 
   60: instr=`echo setcpudelay+34?X | adb $kernel | cut -d: -f 2 | nawk '{ print $1 }'`
   61: 
   62: if [ $instr = $nop ]; then
   63:         echo "Instruction already patched..."
   64: else
   65:         let masked="(16#$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
   75: fi
   76: 
   77: echo "Patching cpu_tick_freq to $cpu_tick_freq..."
   78: 
   79: if ! echo cpu_tick_freq?W 0t$cpu_tick_freq | adb -w $kernel 1> /dev/null; then
   80:         echo "adb returned an unexpected error;  aborting."
   81:         exit 1
   82: fi
   83: 
   84: echo "$kernel successfully patched."
   85: exit 0