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Annotation of embedaddon/ntp/html/hints/solaris.xtra.patchfreq, revision 1.1

1.1     ! misho       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