Cc: Michael Kinney <[email protected]>
Cc: Feng Tian <[email protected]>
Cc: Giri P Mudusuru <[email protected]>
Cc: Laszlo Ersek <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <[email protected]>
---
UefiCpuPkg/Library/MpInitLib/MpLib.c | 39 +++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c
b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index 7ae6559..cbaeccc 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -956,6 +956,7 @@ MpInitLibWhoAmI (
{
return EFI_UNSUPPORTED;
}
+
/**
Retrieves the number of logical processor in the platform and the number of
those logical processors that are enabled on this boot. This service may only
@@ -983,9 +984,45 @@ MpInitLibGetNumberOfProcessors (
OUT UINTN *NumberOfEnabledProcessors OPTIONAL
)
{
- return EFI_UNSUPPORTED;
+ CPU_MP_DATA *CpuMpData;
+ UINTN CallerNumber;
+ UINTN ProcessorNumber;
+ UINTN EnabledProcessorNumber;
+ UINTN Index;
+
+ CpuMpData = GetCpuMpData ();
+
+ if ((NumberOfProcessors == NULL) && (NumberOfEnabledProcessors == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Check whether caller processor is BSP
+ //
+ MpInitLibWhoAmI (&CallerNumber);
+ if (CallerNumber != CpuMpData->BspNumber) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ ProcessorNumber = CpuMpData->CpuCount;
+ EnabledProcessorNumber = 0;
+ for (Index = 0; Index < ProcessorNumber; Index++) {
+ if (GetApState (&CpuMpData->CpuData[Index]) != CpuStateDisabled) {
+ EnabledProcessorNumber ++;
+ }
+ }
+
+ if (NumberOfProcessors != NULL) {
+ *NumberOfProcessors = ProcessorNumber;
+ }
+ if (NumberOfEnabledProcessors != NULL) {
+ *NumberOfEnabledProcessors = EnabledProcessorNumber;
+ }
+
+ return EFI_SUCCESS;
}
+
/**
Get pointer to CPU MP Data structure from GUIDed HOB.
--
2.7.4.windows.1
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