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