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; $Id$
;; @file
; IPRT - ASMWrMsr().
;
;
; Copyright (C) 2013-2022 Oracle and/or its affiliates.
;
; This file is part of VirtualBox base platform packages, as
; available from https://www.virtualbox.org.
;
; This program is free software; you can redistribute it and/or
; modify it under the terms of the GNU General Public License
; as published by the Free Software Foundation, in version 3 of the
; License.
;
; This program is distributed in the hope that it will be useful, but
; WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, see <https://www.gnu.org/licenses>.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
; in the VirtualBox distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
;
;*******************************************************************************
;* Header Files *
;*******************************************************************************
%include "iprt/asmdefs.mac"
BEGINCODE
;;
; Special version of ASMRdMsr that allow specifying the rdi value.
;
; @param uMsr msc=rcx, gcc=rdi, x86=[ebp+8] The MSR to read.
; @param uValue msc=rdx, gcc=rsi, x86=[ebp+12] The 64-bit value to write.
;
RT_BEGINPROC ASMWrMsr
%ifdef ASM_CALL64_MSC
mov rdi, rdx
mov eax, edx
shr rdx, 32
wrmsr
ret
%elifdef ASM_CALL64_GCC
mov ecx, edi
mov eax, esi
mov rdx, rsi
shr edx, 32
wrmsr
ret
%elif ARCH_BITS == 32
push ebp
mov ebp, esp
push edi
mov ecx, [ebp + 8]
mov eax, [ebp + 12]
mov edx, [ebp + 16]
wrmsr
pop edi
leave
ret
%elif ARCH_BITS == 16
push bp
mov bp, sp
push eax
push ecx
push edx
mov ecx, [bp + 04h]
mov eax, [bp + 08h]
mov edx, [bp + 0ch]
wrmsr
pop edx
pop ecx
pop eax
leave
ret
%else
%error "Undefined arch?"
%endif
ENDPROC ASMWrMsr
|
