Revision: 18006
http://sourceforge.net/p/edk2/code/18006
Author: vanjeff
Date: 2015-07-15 03:42:22 +0000 (Wed, 15 Jul 2015)
Log Message:
-----------
UefiCpuPkg/CpuMpPei: Implementation of PeiGetNumberOfProcessors ()
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <[email protected]>
Reviewed-by: Feng Tian <[email protected]>
Reviewed-by: Jiewen Yao <[email protected]>
Modified Paths:
--------------
trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.c
trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.h
Modified: trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.c
===================================================================
--- trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.c 2015-07-15 03:41:59 UTC
(rev 18005)
+++ trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.c 2015-07-15 03:42:22 UTC
(rev 18006)
@@ -44,7 +44,86 @@
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 An indirect pointer to the PEI Services Table
+ published by the PEI Foundation.
+ @param[in] This Pointer to this instance of the PPI.
+ @param[out] NumberOfProcessors Pointer to the total number of logical
processors in
+ the system, including the BSP and disabled
APs.
+ @param[out] NumberOfEnabledProcessors
+ Number of processors in the system that are
enabled.
+
+ @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.
+ 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
called from the BSP and APs.
Modified: trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.h
===================================================================
--- trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.h 2015-07-15 03:41:59 UTC
(rev 18005)
+++ trunk/edk2/UefiCpuPkg/CpuMpPei/PeiMpServices.h 2015-07-15 03:42:22 UTC
(rev 18006)
@@ -17,7 +17,50 @@
#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 An indirect pointer to the PEI Services Table
+ published by the PEI Foundation.
+ @param[in] This Pointer to this instance of the PPI.
+ @param[out] NumberOfProcessors Pointer to the total number of logical
processors in
+ the system, including the BSP and disabled
APs.
+ @param[out] NumberOfEnabledProcessors
+ Number of processors in the system that are
enabled.
+
+ @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.
+ 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
called from the BSP and APs.
------------------------------------------------------------------------------
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