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| author | Michael Kinney <michael.d.kinney@intel.com> | 2015-10-30 17:53:31 +0000 |
|---|---|---|
| committer | mdkinney <mdkinney@Edk2> | 2015-10-30 17:53:31 +0000 |
| commit | 14e4ca25c6199fa29bda7066f31d919197840664 (patch) | |
| tree | c3ee9f1e84f5a400f54cbeb59b9fa374301000c7 /UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c | |
| parent | 0d4c1db81aab86963536deb8253f35546c4398ea (diff) | |
| download | edk2-14e4ca25c6199fa29bda7066f31d919197840664.tar.gz edk2-14e4ca25c6199fa29bda7066f31d919197840664.tar.bz2 edk2-14e4ca25c6199fa29bda7066f31d919197840664.zip | |
UefiCpuPkg: LocalApicLib: Add API to set SoftwareEnable bit
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
Diffstat (limited to 'UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c')
| -rw-r--r-- | UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c b/UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c index 6cf36cb8f4..1fca66ef1b 100644 --- a/UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c +++ b/UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.c @@ -564,6 +564,39 @@ SendInitSipiSipiAllExcludingSelf ( }
/**
+ 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.
This function programs the local APIC for virtual wire mode following
@@ -679,7 +712,6 @@ InitializeApicTimer ( IN UINT8 Vector
)
{
- LOCAL_APIC_SVR Svr;
LOCAL_APIC_DCR Dcr;
LOCAL_APIC_LVT_TIMER LvtTimer;
UINT32 Divisor;
@@ -687,9 +719,7 @@ 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.
|