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git.proxmox.com Git - mirror_edk2.git/blob - MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointer.c
2 PEI Services Table Pointer Library for IA-32 and X64.
4 Copyright (c) 2006 - 2007, Intel Corporation.<BR>
5 All rights reserved. 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
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.
15 #include "InternalPeiServicesTablePointer.h"
19 The function returns the pointer to PeiServicee following
22 For IA32, the four-bytes field immediately prior to new IDT
23 base addres is used to save the EFI_PEI_SERVICES**.
24 For x64, the eight-bytes field immediately prior to new IDT
25 base addres is used to save the EFI_PEI_SERVICES**
26 @retval The pointer to PeiServices.
31 GetPeiServicesTablePointer (
35 EFI_PEI_SERVICES
**PeiServices
;
39 PeiServices
= (EFI_PEI_SERVICES
**) (*(UINTN
*)(Idtr
.Base
- 4));
40 ASSERT (PeiServices
!= NULL
);
46 The function returns the pointer to PeiServicee following
49 For IA32, the four-bytes field immediately prior to new IDT
50 base addres is used to save the EFI_PEI_SERVICES**.
51 For x64, the eight-bytes field immediately prior to new IDT
52 base addres is used to save the EFI_PEI_SERVICES**
53 @retval The pointer to PeiServices.
58 SetPeiServicesTablePointer (
59 EFI_PEI_SERVICES
** PeiServicesTablePointer
65 (*(UINTN
*)(Idtr
.Base
- 4)) = (UINTN
)PeiServicesTablePointer
;
69 After memory initialization in PEI phase, the IDT table in temporary memory should
70 be migrated to memory, and the address of PeiServicesPointer also need to be updated
71 immediately preceding the new IDT table.
73 @param PeiServices The address of PeiServices pointer.
77 IN EFI_PEI_SERVICES
**PeiServices
87 Size
= sizeof(UINTN
) + (Idtr
.Limit
+ 1);
89 Status
= PeiServicesAllocatePool (Size
, &NewBase
);
90 ASSERT_EFI_ERROR (Status
);
92 CopyMem ((VOID
*)((UINTN
)NewBase
+ sizeof(UINTN
)), (VOID
*)Idtr
.Base
, (Idtr
.Limit
+ 1));
94 Idtr
.Base
= (UINTN
)NewBase
+ sizeof(UINTN
);
96 SetPeiServicesTablePointer(PeiServices
);