1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2014 - 2015, Intel Corporation. All rights reserved.<BR> 4 ; This program and the accompanying materials 5 ; are licensed and made available under the terms and conditions of the BSD License 6 ; which accompanies this distribution. The full text of the license may be found at 7 ; http://opensource.org/licenses/bsd-license.php. 8 ; 9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 ; 12 ; Abstract: 13 ; 14 ; Switch the stack from temporary memory to permenent memory. 15 ; 16 ;------------------------------------------------------------------------------ 17 18 .586p 19 .model flat,C 20 .code 21 22 ;------------------------------------------------------------------------------ 23 ; UINT32 24 ; EFIAPI 25 ; Pei2LoaderSwitchStack ( 26 ; VOID 27 ; ) 28 ;------------------------------------------------------------------------------ 29 EXTERNDEF C MeasurePoint:PROC 30 Pei2LoaderSwitchStack PROC C PUBLIC 31 xor eax, eax 32 jmp FspSwitchStack 33 Pei2LoaderSwitchStack ENDP 34 35 ;------------------------------------------------------------------------------ 36 ; UINT32 37 ; EFIAPI 38 ; Loader2PeiSwitchStack ( 39 ; VOID 40 ; ) 41 ;------------------------------------------------------------------------------ 42 Loader2PeiSwitchStack PROC C PUBLIC 43 jmp FspSwitchStack 44 Loader2PeiSwitchStack ENDP 45 46 ;------------------------------------------------------------------------------ 47 ; UINT32 48 ; EFIAPI 49 ; FspSwitchStack ( 50 ; VOID 51 ; ) 52 ;------------------------------------------------------------------------------ 53 EXTERNDEF C SwapStack:PROC 54 FspSwitchStack PROC C PUBLIC 55 ; Save current contexts 56 push eax 57 pushfd 58 cli 59 pushad 60 sub esp, 8 61 sidt fword ptr [esp] 62 63 ; Load new stack 64 push esp 65 call SwapStack 66 mov esp, eax 67 68 ; Restore previous contexts 69 lidt fword ptr [esp] 70 add esp, 8 71 popad 72 popfd 73 add esp, 4 74 ret 75 FspSwitchStack ENDP 76 77 END 78
