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;------------------------------------------------------------------------------
;
; Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Abstract:
;
; Switch the stack from temporary memory to permanent memory.
;
;------------------------------------------------------------------------------
SECTION .text
%include "PushPopRegsNasm.inc"
extern ASM_PFX(SwapStack)
;------------------------------------------------------------------------------
; UINT32
; EFIAPI
; Pei2LoaderSwitchStack (
; VOID
; )
;------------------------------------------------------------------------------
global ASM_PFX(Pei2LoaderSwitchStack)
ASM_PFX(Pei2LoaderSwitchStack):
xor rax, rax
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 rdx ; ApiParam2
push rcx ; ApiParam1
push rax ; FspInfoHeader
pushfq
cli
PUSHA_64
sub rsp, 16
sidt [rsp]
; Load new stack
mov rcx, rsp
call ASM_PFX(SwapStack)
mov rsp, rax
; Restore previous contexts
lidt [rsp]
add rsp, 16
POPA_64
popfq
add rsp, 24 ; FspInfoHeader + ApiParam[2]
ret
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