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UefiCpuPkg: Add ASSERT to handle local APIC not config properly 

When the local APIC is not configurated properly, function
GetApicTimerInitCount() in LocalApicLib may return zero, which will lead
to a divide by zero exception in SecPeiDxeTimerLibUefiCpu.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18594 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Hao Wu 2015-10-09 07:04:00 +00:00 committed by hwu1225
parent 53fa8748fd
commit f17e2f8c9e
1 changed files with 5 additions and 1 deletions
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6
UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/X86TimerLib.c
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@ -3,7 +3,7 @@
This library uses the local APIC library so that it supports x2APIC mode. This library uses the local APIC library so that it supports x2APIC mode.
Copyright (c) 2010 - 2013, Intel Corporation. All rights reserved.<BR> Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at which accompanies this distribution. The full text of the license may be found at
@ -45,6 +45,9 @@ InternalX86GetTimerFrequency (
Stalls the CPU for at least the given number of ticks. It's invoked by Stalls the CPU for at least the given number of ticks. It's invoked by
MicroSecondDelay() and NanoSecondDelay(). MicroSecondDelay() and NanoSecondDelay().
This function will ASSERT if the APIC timer intial count returned from
GetApicTimerInitCount() is zero.
@param Delay A period of time to delay in ticks. @param Delay A period of time to delay in ticks.
**/ **/
@ -67,6 +70,7 @@ InternalX86Delay (
// Delay and the Init Count. // Delay and the Init Count.
// //
InitCount = GetApicTimerInitCount (); InitCount = GetApicTimerInitCount ();
ASSERT (InitCount != 0);
Times = Delay / (InitCount / 2); Times = Delay / (InitCount / 2);
Delay = Delay % (InitCount / 2); Delay = Delay % (InitCount / 2);