1 /** @file
2 EBC-specific functionality for DxeLoad.
3
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
9
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
12
13 **/
14
15 #include "DxeIpl.h"
16
17
18
19 /**
20 Transfers control to DxeCore.
21
22 This function performs a CPU architecture specific operations to execute
23 the entry point of DxeCore with the parameters of HobList.
24 It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
25
26 @param DxeCoreEntryPoint The entry point of DxeCore.
27 @param HobList The start of HobList passed to DxeCore.
28
29 **/
30 VOID
HandOffToDxeCore(IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,IN EFI_PEI_HOB_POINTERS HobList)31 HandOffToDxeCore (
32 IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,
33 IN EFI_PEI_HOB_POINTERS HobList
34 )
35 {
36 VOID *BaseOfStack;
37 VOID *TopOfStack;
38 EFI_STATUS Status;
39
40 //
41 // Allocate 128KB for the Stack
42 //
43 BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
44 ASSERT (BaseOfStack != NULL);
45
46 //
47 // Compute the top of the stack we were allocated. Pre-allocate a UINTN
48 // for safety.
49 //
50 TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
51 TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
52
53 //
54 // End of PEI phase signal
55 //
56 Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
57 ASSERT_EFI_ERROR (Status);
58
59 //
60 // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
61 //
62 UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
63
64 //
65 // Transfer the control to the entry point of DxeCore.
66 //
67 SwitchStack (
68 (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
69 HobList.Raw,
70 NULL,
71 TopOfStack
72 );
73 }
74