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UefiCpuPkg BaseXApic(X2)Lib: Add ASSERT if local APIC not software enabled

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Add an ASSERT in GetApicTimerState() to check if the local APIC is
software enabled.

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@18595 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Hao Wu
2015-10-09 07:04:26 +00:00
committed by hwu1225
parent f17e2f8c9e
commit 6d72ff7d9d
2 changed files with 19 additions and 1 deletions
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9
UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c
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@@ -723,6 +723,8 @@ InitializeApicTimer (
/**
Get the state of the local APIC timer.
This function will ASSERT if the local APIC is not software enabled.
@param DivideValue Return the divide value for the DCR. It is one of 1,2,4,8,16,32,64,128.
@param PeriodicMode Return the timer mode. If TRUE, timer mode is peridoic. Othewise, timer mode is one-shot.
@param Vector Return the timer interrupt vector number.
@@ -739,6 +741,13 @@ GetApicTimerState (
LOCAL_APIC_DCR Dcr;
LOCAL_APIC_LVT_TIMER LvtTimer;
//
// Check the APIC Software Enable/Disable bit (bit 8) in Spurious-Interrupt
// Vector Register.
// This bit will be 1, if local APIC is software enabled.
//
ASSERT ((ReadLocalApicReg(XAPIC_SPURIOUS_VECTOR_OFFSET) & BIT8) != 0);
if (DivideValue != NULL) {
Dcr.Uint32 = ReadLocalApicReg (XAPIC_TIMER_DIVIDE_CONFIGURATION_OFFSET);
Divisor = Dcr.Bits.DivideValue1 | (Dcr.Bits.DivideValue2 << 2);