1 /** @file
2   EBC-specific functionality for DxeLoad.
3 
4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
6 
7 **/
8 
9 #include "DxeIpl.h"
10 
11 
12 
13 /**
14    Transfers control to DxeCore.
15 
16    This function performs a CPU architecture specific operations to execute
17    the entry point of DxeCore with the parameters of HobList.
18    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
19 
20    @param DxeCoreEntryPoint         The entry point of DxeCore.
21    @param HobList                   The start of HobList passed to DxeCore.
22 
23 **/
24 VOID
HandOffToDxeCore(IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,IN EFI_PEI_HOB_POINTERS HobList)25 HandOffToDxeCore (
26   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
27   IN EFI_PEI_HOB_POINTERS   HobList
28   )
29 {
30   VOID                *BaseOfStack;
31   VOID                *TopOfStack;
32   EFI_STATUS          Status;
33 
34   //
35   // Allocate 128KB for the Stack
36   //
37   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
38   ASSERT (BaseOfStack != NULL);
39 
40   //
41   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
42   // for safety.
43   //
44   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
45   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
46 
47   //
48   // End of PEI phase signal
49   //
50   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
51   ASSERT_EFI_ERROR (Status);
52 
53   //
54   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
55   //
56   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
57 
58   //
59   // Transfer the control to the entry point of DxeCore.
60   //
61   SwitchStack (
62     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
63     HobList.Raw,
64     NULL,
65     TopOfStack
66     );
67 }
68