UefiCpuPkg/MpInitLib: split wake up buffer into two parts

[mirror_edk2.git] / UefiCpuPkg / Library / MpInitLib / PeiMpLib.c

diff --git a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
index 9ee5aca57b2bb41aa8dd85793dc9434a247fd338..ad43bd33f5f820c0c00192c33b22966ce678f5d7 100644 (file)
--- a/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/PeiMpLib.c
@@ -188,39 +188,26 @@ GetWakeupBuffer (
 }\r
 \r
 /**\r
-  Allocate reset vector buffer.\r
+  Get available EfiBootServicesCode memory below 4GB by specified size.\r
 \r
-  @param[in, out]  CpuMpData  The pointer to CPU MP Data structure.\r
-**/\r
-VOID\r
-AllocateResetVector (\r
-  IN OUT CPU_MP_DATA          *CpuMpData\r
-  )\r
-{\r
-  UINTN           ApResetVectorSize;\r
+  This buffer is required to safely transfer AP from real address mode to\r
+  protected mode or long mode, due to the fact that the buffer returned by\r
+  GetWakeupBuffer() may be marked as non-executable.\r
 \r
-  if (CpuMpData->WakeupBuffer == (UINTN) -1) {\r
-    ApResetVectorSize = CpuMpData->AddressMap.RendezvousFunnelSize +\r
-                          sizeof (MP_CPU_EXCHANGE_INFO);\r
-\r
-    CpuMpData->WakeupBuffer      = GetWakeupBuffer (ApResetVectorSize);\r
-    CpuMpData->MpCpuExchangeInfo = (MP_CPU_EXCHANGE_INFO *) (UINTN)\r
-                    (CpuMpData->WakeupBuffer + CpuMpData->AddressMap.RendezvousFunnelSize);\r
-  }\r
-  BackupAndPrepareWakeupBuffer (CpuMpData);\r
-}\r
+  @param[in] BufferSize   Wakeup transition buffer size.\r
 \r
-/**\r
-  Free AP reset vector buffer.\r
-\r
-  @param[in]  CpuMpData  The pointer to CPU MP Data structure.\r
+  @retval other   Return wakeup transition buffer address below 4GB.\r
+  @retval 0       Cannot find free memory below 4GB.\r
 **/\r
-VOID\r
-FreeResetVector (\r
-  IN CPU_MP_DATA              *CpuMpData\r
+UINTN\r
+GetModeTransitionBuffer (\r
+  IN UINTN                BufferSize\r
   )\r
 {\r
-  RestoreWakeupBuffer (CpuMpData);\r
+  //\r
+  // PEI phase doesn't need to do such transition. So simply return 0.\r
+  //\r
+  return 0;\r
 }\r
 \r
 /**\r