1 files changed, 50 insertions, 0 deletions
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.h b/UefiCpuPkg/CpuDxe/CpuMp.h
index d061bc4a61..e4adb3f0e1 100644
--- a/UefiCpuPkg/CpuDxe/CpuMp.h
+++ b/UefiCpuPkg/CpuDxe/CpuMp.h
@@ -203,6 +203,56 @@ GetProcessorInfo (
   );
 
 /**
+  This service lets the caller enable or disable an AP from this point onward.
+  This service may only be called from the BSP.
+
+  This service allows the caller enable or disable an AP from this point onward.
+  The caller can optionally specify the health status of the AP by Health. If
+  an AP is being disabled, then the state of the disabled AP is implementation
+  dependent. If an AP is enabled, then the implementation must guarantee that a
+  complete initialization sequence is performed on the AP, so the AP is in a state
+  that is compatible with an MP operating system. This service may not be supported
+  after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled.
+
+  If the enable or disable AP operation cannot be completed prior to the return
+  from this service, then EFI_UNSUPPORTED must be returned.
+
+  @param[in] This              A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
+  @param[in] 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().
+  @param[in] EnableAP          Specifies the new state for the processor for
+                               enabled, FALSE for disabled.
+  @param[in] HealthFlag        If not NULL, a pointer to a value that specifies
+                               the new health status of the AP. This flag
+                               corresponds to StatusFlag defined in
+                               EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only
+                               the PROCESSOR_HEALTH_STATUS_BIT is used. All other
+                               bits are ignored.  If it is NULL, this parameter
+                               is ignored.
+
+  @retval EFI_SUCCESS             The specified AP was enabled or disabled successfully.
+  @retval EFI_UNSUPPORTED         Enabling or disabling an AP cannot be completed
+                                  prior to this service returning.
+  @retval EFI_UNSUPPORTED         Enabling or disabling an AP is not supported.
+  @retval EFI_DEVICE_ERROR        The calling processor is an AP.
+  @retval EFI_NOT_FOUND           Processor with the handle specified by ProcessorNumber
+                                  does not exist.
+  @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP.
+
+**/
+EFI_STATUS
+EFIAPI
+EnableDisableAP (
+  IN  EFI_MP_SERVICES_PROTOCOL  *This,
+  IN  UINTN                     ProcessorNumber,
+  IN  BOOLEAN                   EnableAP,
+  IN  UINT32                    *HealthFlag OPTIONAL
+  );
+
+/**
   This return the handle number for the calling processor.  This service may be
   called from the BSP and APs.