UefiCpuPkg/CpuMpPei: Implementation of PeiWhoAmI ()

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18005 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 93 insertions, 0 deletions

diff --git a/UefiCpuPkg/CpuMpPei/PeiMpServices.c b/UefiCpuPkg/CpuMpPei/PeiMpServices.c
new file mode 100644
index 0000000000..e9d3fa1fe4
--- /dev/null
+++ b/UefiCpuPkg/CpuMpPei/PeiMpServices.c
@@ -0,0 +1,93 @@
+/** @file
+  Implementation of Multiple Processor PPI services.
+
+  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "PeiMpServices.h"
+
+
+
+/**
+  Find the current Processor number by APIC ID.
+
+  @param PeiCpuMpData        Pointer to PEI CPU MP Data
+  @param ProcessorNumber     Return the pocessor number found
+
+  @retval EFI_SUCCESS        ProcessorNumber is found and returned.
+  @retval EFI_NOT_FOUND      ProcessorNumber is not found.
+**/
+EFI_STATUS
+GetProcessorNumber (
+  IN PEI_CPU_MP_DATA         *PeiCpuMpData,
+  OUT UINTN                  *ProcessorNumber
+  )
+{
+  UINTN                   TotalProcessorNumber;
+  UINTN                   Index;
+
+  TotalProcessorNumber = PeiCpuMpData->CpuCount;
+  for (Index = 0; Index < TotalProcessorNumber; Index ++) {
+    if (PeiCpuMpData->CpuData[Index].ApicId == GetInitialApicId ()) {
+      *ProcessorNumber = Index;
+      return EFI_SUCCESS;
+    }
+  }
+  return EFI_NOT_FOUND;
+}
+
+
+/**
+  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_PEI_MP_SERVICES_PPI.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]  PeiServices         An indirect pointer to the PEI Services Table
+                                  published by the PEI Foundation.
+  @param[in]  This                A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
+  @param[out] ProcessorNumber     The handle number of the AP. 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_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
+
+  @retval EFI_SUCCESS             The current processor handle number was returned in
+                                  ProcessorNumber.
+  @retval EFI_INVALID_PARAMETER   ProcessorNumber is NULL.
+**/
+EFI_STATUS
+EFIAPI
+PeiWhoAmI (
+  IN  CONST EFI_PEI_SERVICES   **PeiServices,
+  IN  EFI_PEI_MP_SERVICES_PPI  *This,
+  OUT UINTN                    *ProcessorNumber
+  )
+{
+  PEI_CPU_MP_DATA         *PeiCpuMpData;
+
+  PeiCpuMpData = GetMpHobData ();
+  if (PeiCpuMpData == NULL) {
+    return EFI_NOT_FOUND;
+  }
+
+  if (ProcessorNumber == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  return GetProcessorNumber (PeiCpuMpData, ProcessorNumber);
+}
+