dist/ntp/html/build/hints/solaris.xtra.patchfreq

   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