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UefiCpuPkg: LocalApicLib: Add API to set SoftwareEnable bit

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The LocalApicLib does not provide a function to manage the state of the
Local APIC SoftwareEnable bit in the Spurious Vector register.  There
are cases where this bit needs to be managed without side effects to.
other Local APIC registers.  One use case is in the DebugAgent in the
SourceLevelDebugPkg.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-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@18711 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Michael Kinney
2015-10-30 17:53:31 +00:00
committed by mdkinney
parent 0d4c1db81a
commit 14e4ca25c6
3 changed files with 83 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
UefiCpuPkg/Library/BaseXApicX2ApicLib/BaseXApicX2ApicLib.c
View File

@@ -658,6 +658,39 @@ SendInitSipiSipiAllExcludingSelf (
SendIpi (IcrLow.Uint32, 0);
}
/**
Initialize the state of the SoftwareEnable bit in the Local APIC
Spurious Interrupt Vector register.
@param Enable If TRUE, then set SoftwareEnable to 1
If FALSE, then set SoftwareEnable to 0.
**/
VOID
EFIAPI
InitializeLocalApicSoftwareEnable (
IN BOOLEAN Enable
)
{
LOCAL_APIC_SVR Svr;
//
// Set local APIC software-enabled bit.
//
Svr.Uint32 = ReadLocalApicReg (XAPIC_SPURIOUS_VECTOR_OFFSET);
if (Enable) {
if (Svr.Bits.SoftwareEnable == 0) {
Svr.Bits.SoftwareEnable = 1;
WriteLocalApicReg (XAPIC_SPURIOUS_VECTOR_OFFSET, Svr.Uint32);
}
} else {
if (Svr.Bits.SoftwareEnable == 1) {
Svr.Bits.SoftwareEnable = 0;
WriteLocalApicReg (XAPIC_SPURIOUS_VECTOR_OFFSET, Svr.Uint32);
}
}
}
/**
Programming Virtual Wire Mode.
@@ -774,7 +807,6 @@ InitializeApicTimer (
IN UINT8 Vector
)
{
LOCAL_APIC_SVR Svr;
LOCAL_APIC_DCR Dcr;
LOCAL_APIC_LVT_TIMER LvtTimer;
UINT32 Divisor;
@@ -782,9 +814,7 @@ InitializeApicTimer (
//
// Ensure local APIC is in software-enabled state.
//
Svr.Uint32 = ReadLocalApicReg (XAPIC_SPURIOUS_VECTOR_OFFSET);
Svr.Bits.SoftwareEnable = 1;
WriteLocalApicReg (XAPIC_SPURIOUS_VECTOR_OFFSET, Svr.Uint32);
InitializeLocalApicSoftwareEnable (TRUE);
//
// Program init-count register.