1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2016, 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 SECTION .text 19 20 extern ASM_PFX(SwapStack) 21 22 ;------------------------------------------------------------------------------ 23 ; UINT32 24 ; EFIAPI 25 ; Pei2LoaderSwitchStack ( 26 ; VOID 27 ; ) 28 ;------------------------------------------------------------------------------ 29 global ASM_PFX(Pei2LoaderSwitchStack) 30 ASM_PFX(Pei2LoaderSwitchStack): 31 xor eax, eax 32 jmp ASM_PFX(FspSwitchStack) 33 34 ;------------------------------------------------------------------------------ 35 ; UINT32 36 ; EFIAPI 37 ; Loader2PeiSwitchStack ( 38 ; VOID 39 ; ) 40 ;------------------------------------------------------------------------------ 41 global ASM_PFX(Loader2PeiSwitchStack) 42 ASM_PFX(Loader2PeiSwitchStack): 43 jmp ASM_PFX(FspSwitchStack) 44 45 ;------------------------------------------------------------------------------ 46 ; UINT32 47 ; EFIAPI 48 ; FspSwitchStack ( 49 ; VOID 50 ; ) 51 ;------------------------------------------------------------------------------ 52 global ASM_PFX(FspSwitchStack) 53 ASM_PFX(FspSwitchStack): 54 ; Save current contexts 55 push eax 56 pushfd 57 cli 58 pushad 59 sub esp, 8 60 sidt [esp] 61 62 ; Load new stack 63 push esp 64 call ASM_PFX(SwapStack) 65 mov esp, eax 66 67 ; Restore previous contexts 68 lidt [esp] 69 add esp, 8 70 popad 71 popfd 72 add esp, 4 73 ret 74 75
