;------------------------------------------------------------------------------ ; ; Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.
; SPDX-License-Identifier: BSD-2-Clause-Patent ; ; Abstract: ; ; Switch the stack from temporary memory to permanent memory. ; ;------------------------------------------------------------------------------ SECTION .text extern ASM_PFX(SwapStack) ;------------------------------------------------------------------------------ ; UINT32 ; EFIAPI ; Pei2LoaderSwitchStack ( ; VOID ; ) ;------------------------------------------------------------------------------ global ASM_PFX(Pei2LoaderSwitchStack) ASM_PFX(Pei2LoaderSwitchStack): xor eax, eax jmp ASM_PFX(FspSwitchStack) ;------------------------------------------------------------------------------ ; UINT32 ; EFIAPI ; Loader2PeiSwitchStack ( ; VOID ; ) ;------------------------------------------------------------------------------ global ASM_PFX(Loader2PeiSwitchStack) ASM_PFX(Loader2PeiSwitchStack): jmp ASM_PFX(FspSwitchStack) ;------------------------------------------------------------------------------ ; UINT32 ; EFIAPI ; FspSwitchStack ( ; VOID ; ) ;------------------------------------------------------------------------------ global ASM_PFX(FspSwitchStack) ASM_PFX(FspSwitchStack): ; Save current contexts push eax pushfd cli pushad sub esp, 8 sidt [esp] ; Load new stack push esp call ASM_PFX(SwapStack) mov esp, eax ; Restore previous contexts lidt [esp] add esp, 8 popad popfd add esp, 4 ret