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/* $Id: bs3-cmn-ExtCtxGetAbridgedFtw.c $ */
/** @file
* BS3Kit - Bs3ExtCtxGetAbridgedFtw
*/
/*
* Copyright (C) 2007-2023 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 "bs3kit-template-header.h"
#undef Bs3ExtCtxGetAbridgedFtw
BS3_CMN_DEF(uint16_t, Bs3ExtCtxGetAbridgedFtw,(PCBS3EXTCTX pExtCtx))
{
AssertCompileMembersAtSameOffset(BS3EXTCTX, Ctx.x87.FTW, BS3EXTCTX, Ctx.x.x87.FTW);
switch (pExtCtx->enmMethod)
{
case BS3EXTCTXMETHOD_FXSAVE:
case BS3EXTCTXMETHOD_XSAVE:
return pExtCtx->Ctx.x87.FTW;
case BS3EXTCTXMETHOD_ANCIENT:
{
/* iemFpuCompressFtw: */
uint16_t u16FullFtw = pExtCtx->Ctx.Ancient.FTW;
uint8_t u8Ftw = 0;
unsigned i;
for (i = 0; i < 8; i++)
{
if ((u16FullFtw & 3) != 3 /*empty*/)
u8Ftw |= RT_BIT(i);
u16FullFtw >>= 2;
}
return u8Ftw;
}
}
return 0;
}
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