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 20extern ASM_PFX(SwapStack) 21 22;------------------------------------------------------------------------------ 23; UINT32 24; EFIAPI 25; Pei2LoaderSwitchStack ( 26; VOID 27; ) 28;------------------------------------------------------------------------------ 29global ASM_PFX(Pei2LoaderSwitchStack) 30ASM_PFX(Pei2LoaderSwitchStack): 31 xor eax, eax 32 jmp ASM_PFX(FspSwitchStack) 33 34;------------------------------------------------------------------------------ 35; UINT32 36; EFIAPI 37; Loader2PeiSwitchStack ( 38; VOID 39; ) 40;------------------------------------------------------------------------------ 41global ASM_PFX(Loader2PeiSwitchStack) 42ASM_PFX(Loader2PeiSwitchStack): 43 jmp ASM_PFX(FspSwitchStack) 44 45;------------------------------------------------------------------------------ 46; UINT32 47; EFIAPI 48; FspSwitchStack ( 49; VOID 50; ) 51;------------------------------------------------------------------------------ 52global ASM_PFX(FspSwitchStack) 53ASM_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