Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chen Fan <[email protected]>
---
UefiCpuPkg/CpuDxe/CpuMp.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++-
UefiCpuPkg/CpuDxe/CpuMp.h | 31 ++++++++++++++++++++++++++++
2 files changed, 81 insertions(+), 1 deletion(-)
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.c b/UefiCpuPkg/CpuDxe/CpuMp.c
index 6423bfa..6658a4c 100644
--- a/UefiCpuPkg/CpuDxe/CpuMp.c
+++ b/UefiCpuPkg/CpuDxe/CpuMp.c
@@ -33,10 +33,59 @@ EFI_MP_SERVICES_PROTOCOL mMpServicesTemplate = {
NULL, // StartupThisAP,
NULL, // SwitchBSP,
NULL, // EnableDisableAP,
- NULL // WhoAmI
+ WhoAmI
};
/**
+ This return the handle number for the calling processor. This service may be
+ called from the BSP and APs.
+
+ This service returns the processor handle number for the calling processor.
+ The returned value is in the range from 0 to the total number of logical
+ processors minus 1. The total number of logical processors can be retrieved
+ with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be
+ called from the BSP and APs. If ProcessorNumber is NULL, then
EFI_INVALID_PARAMETER
+ is returned. Otherwise, the current processors handle number is returned in
+ ProcessorNumber, and EFI_SUCCESS is returned.
+
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL
instance.
+ @param[out] ProcessorNumber The handle number of AP that is to become the
new
+ BSP. The range is from 0 to the total number of
+ logical processors minus 1. The total number of
+ logical processors can be retrieved by
+
EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
+
+ @retval EFI_SUCCESS The current processor handle number was
returned
+ in ProcessorNumber.
+ @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+WhoAmI (
+ IN EFI_MP_SERVICES_PROTOCOL *This,
+ OUT UINTN *ProcessorNumber
+ )
+{
+ UINTN Index;
+ UINT32 ProcessorId;
+
+ if (ProcessorNumber == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ ProcessorId = GetApicId ();
+ for (Index = 0; Index < mMpSystemData.NumberOfProcessors; Index++) {
+ if (mMpSystemData.CpuDatas[Index].Info.ProcessorId == ProcessorId) {
+ break;
+ }
+ }
+
+ *ProcessorNumber = Index;
+ return EFI_SUCCESS;
+}
+
+/**
Application Processor C code entry point.
**/
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.h b/UefiCpuPkg/CpuDxe/CpuMp.h
index 1b28d04..2a966a4 100644
--- a/UefiCpuPkg/CpuDxe/CpuMp.h
+++ b/UefiCpuPkg/CpuDxe/CpuMp.h
@@ -105,5 +105,36 @@ typedef struct {
UINTN NumberOfEnabledProcessors;
} MP_SYSTEM_DATA;
+/**
+ This return the handle number for the calling processor. This service may be
+ called from the BSP and APs.
+
+ This service returns the processor handle number for the calling processor.
+ The returned value is in the range from 0 to the total number of logical
+ processors minus 1. The total number of logical processors can be retrieved
+ with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be
+ called from the BSP and APs. If ProcessorNumber is NULL, then
EFI_INVALID_PARAMETER
+ is returned. Otherwise, the current processors handle number is returned in
+ ProcessorNumber, and EFI_SUCCESS is returned.
+
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL
instance.
+ @param[out] ProcessorNumber The handle number of AP that is to become the
new
+ BSP. The range is from 0 to the total number of
+ logical processors minus 1. The total number of
+ logical processors can be retrieved by
+
EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
+
+ @retval EFI_SUCCESS The current processor handle number was
returned
+ in ProcessorNumber.
+ @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+WhoAmI (
+ IN EFI_MP_SERVICES_PROTOCOL *This,
+ OUT UINTN *ProcessorNumber
+ );
+
#endif // _CPU_MP_H_
--
1.9.3
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