Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <[email protected]>
CC: Feng Tian <[email protected]>
CC: Jiewen Yao <[email protected]>
CC: Michael Kinney <[email protected]>
---
UefiCpuPkg/CpuMpPei/PeiMpServices.c | 82 +++++++++++++++++++++++++++++++++++++
UefiCpuPkg/CpuMpPei/PeiMpServices.h | 46 +++++++++++++++++++++
2 files changed, 128 insertions(+)
diff --git a/UefiCpuPkg/CpuMpPei/PeiMpServices.c
b/UefiCpuPkg/CpuMpPei/PeiMpServices.c
index c411b15..de3e6d8 100644
--- a/UefiCpuPkg/CpuMpPei/PeiMpServices.c
+++ b/UefiCpuPkg/CpuMpPei/PeiMpServices.c
@@ -44,6 +44,88 @@ GetProcessorNumber (
return EFI_NOT_FOUND;
}
+/**
+ This service 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 be called from the BSP.
+
+ This function is used to retrieve the following information:
+ - The number of logical processors that are present in the system.
+ - The number of enabled logical processors in the system at the instant
+ this call is made.
+
+ Because MP Service Ppi provides services to enable and disable processors
+ dynamically, the number of enabled logical processors may vary during the
+ course of a boot session.
+
+ If this service is called from an AP, then EFI_DEVICE_ERROR is returned.
+ If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then
+ EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors
+ is returned in NumberOfProcessors, the number of currently enabled processor
+ is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.
+
+ @param[in] PeiServices General purpose services available
to every PEIM.
+ @param[in] This A pointer to the
EFI_PEI_MP_SERVICES_PPI
+ instance.
+ @param[out] NumberOfProcessors Pointer to the total number of
logical
+ processors in the system, including
the BSP
+ and disabled APs.
+ @param[out] NumberOfEnabledProcessors Pointer to the number of enabled
logical
+ processors that exist in system,
including
+ the BSP.
+
+ @retval EFI_SUCCESS The number of logical processors and enabled
+ logical processors was retrieved.
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.
+ @retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.
+ @retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+PeiGetNumberOfProcessors (
+ IN CONST EFI_PEI_SERVICES **PeiServices,
+ IN EFI_PEI_MP_SERVICES_PPI *This,
+ OUT UINTN *NumberOfProcessors,
+ OUT UINTN *NumberOfEnabledProcessors
+ )
+{
+ PEI_CPU_MP_DATA *PeiCpuMpData;
+ UINTN CallerNumber;
+ UINTN ProcessorNumber;
+ UINTN EnabledProcessorNumber;
+ UINTN Index;
+
+ PeiCpuMpData = GetMpHobData ();
+ if (PeiCpuMpData == NULL) {
+ return EFI_NOT_FOUND;
+ }
+
+ if ((NumberOfProcessors == NULL) || (NumberOfEnabledProcessors == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Check whether caller processor is BSP
+ //
+ PeiWhoAmI (PeiServices, This, &CallerNumber);
+ if (CallerNumber != PeiCpuMpData->BspNumber) {
+ return EFI_DEVICE_ERROR;
+ }
+
+ ProcessorNumber = PeiCpuMpData->CpuCount;
+ EnabledProcessorNumber = 0;
+ for (Index = 0; Index < ProcessorNumber; Index++) {
+ if (PeiCpuMpData->CpuData[Index].State != CpuStateDisabled) {
+ EnabledProcessorNumber ++;
+ }
+ }
+
+ *NumberOfProcessors = ProcessorNumber;
+ *NumberOfEnabledProcessors = EnabledProcessorNumber;
+
+ return EFI_SUCCESS;
+}
/**
This return the handle number for the calling processor. This service may be
diff --git a/UefiCpuPkg/CpuMpPei/PeiMpServices.h
b/UefiCpuPkg/CpuMpPei/PeiMpServices.h
index 5958fd8..a2eb708 100644
--- a/UefiCpuPkg/CpuMpPei/PeiMpServices.h
+++ b/UefiCpuPkg/CpuMpPei/PeiMpServices.h
@@ -17,6 +17,52 @@
#include "CpuMpPei.h"
+/**
+ This service 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 be called from the BSP.
+
+ This function is used to retrieve the following information:
+ - The number of logical processors that are present in the system.
+ - The number of enabled logical processors in the system at the instant
+ this call is made.
+
+ Because MP Service Ppi provides services to enable and disable processors
+ dynamically, the number of enabled logical processors may vary during the
+ course of a boot session.
+
+ If this service is called from an AP, then EFI_DEVICE_ERROR is returned.
+ If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then
+ EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors
+ is returned in NumberOfProcessors, the number of currently enabled processor
+ is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.
+
+ @param[in] PeiServices General purpose services available
to every PEIM.
+ @param[in] This A pointer to the
EFI_PEI_MP_SERVICES_PPI
+ instance.
+ @param[out] NumberOfProcessors Pointer to the total number of
logical
+ processors in the system, including
the BSP
+ and disabled APs.
+ @param[out] NumberOfEnabledProcessors Pointer to the number of enabled
logical
+ processors that exist in system,
including
+ the BSP.
+
+ @retval EFI_SUCCESS The number of logical processors and enabled
+ logical processors was retrieved.
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.
+ @retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.
+ @retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+PeiGetNumberOfProcessors (
+ IN CONST EFI_PEI_SERVICES **PeiServices,
+ IN EFI_PEI_MP_SERVICES_PPI *This,
+ OUT UINTN *NumberOfProcessors,
+ OUT UINTN *NumberOfEnabledProcessors
+ );
+
/**
This return the handle number for the calling processor. This service may be
--
1.9.5.msysgit.0
------------------------------------------------------------------------------
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