1 /** @file
2 ARM specifc functionality for DxeLoad.
3
4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
5 Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
6
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
11
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14
15 **/
16
17 #include "DxeIpl.h"
18
19 #include <Library/ArmLib.h>
20
21 /**
22 Transfers control to DxeCore.
23
24 This function performs a CPU architecture specific operations to execute
25 the entry point of DxeCore with the parameters of HobList.
26 It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
27
28 @param DxeCoreEntryPoint The entry point of DxeCore.
29 @param HobList The start of HobList passed to DxeCore.
30
31 **/
32 VOID
HandOffToDxeCore(IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,IN EFI_PEI_HOB_POINTERS HobList)33 HandOffToDxeCore (
34 IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,
35 IN EFI_PEI_HOB_POINTERS HobList
36 )
37 {
38 VOID *BaseOfStack;
39 VOID *TopOfStack;
40 EFI_STATUS Status;
41
42 //
43 // Allocate 128KB for the Stack
44 //
45 BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
46 ASSERT (BaseOfStack != NULL);
47
48 if (PcdGetBool (PcdSetNxForStack)) {
49 Status = ArmSetMemoryRegionNoExec ((UINTN)BaseOfStack, STACK_SIZE);
50 ASSERT_EFI_ERROR (Status);
51 }
52
53 //
54 // Compute the top of the stack we were allocated. Pre-allocate a UINTN
55 // for safety.
56 //
57 TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
58 TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
59
60 //
61 // End of PEI phase singal
62 //
63 Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
64 ASSERT_EFI_ERROR (Status);
65
66 //
67 // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
68 //
69 UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
70
71 SwitchStack (
72 (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
73 HobList.Raw,
74 NULL,
75 TopOfStack
76 );
77 }
78