CloverBootloader/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm

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NASM
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;------------------------------------------------------------------------------
;*
;* Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
;* SPDX-License-Identifier: BSD-2-Clause-Patent
;*
;* CpuAsm.nasm
;*
;* Abstract:
;*
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; VOID
; SetCodeSelector (
; UINT16 Selector
; );
;------------------------------------------------------------------------------
global ASM_PFX(SetCodeSelector)
ASM_PFX(SetCodeSelector):
sub rsp, 0x10
lea rax, [setCodeSelectorLongJump]
mov [rsp], rax
mov [rsp+4], cx
jmp dword far [rsp]
setCodeSelectorLongJump:
add rsp, 0x10
ret
;------------------------------------------------------------------------------
; VOID
; SetDataSelectors (
; UINT16 Selector
; );
;------------------------------------------------------------------------------
global ASM_PFX(SetDataSelectors)
ASM_PFX(SetDataSelectors):
o16 mov ss, cx
o16 mov ds, cx
o16 mov es, cx
o16 mov fs, cx
o16 mov gs, cx
ret