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/* $Id: bs3-cmn-ExtCtxInit.c $ */
/** @file
* BS3Kit - Bs3ExtCtxInit
*/
/*
* 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"
#include <iprt/asm-amd64-x86.h>
#undef Bs3ExtCtxInit
BS3_CMN_DEF(PBS3EXTCTX, Bs3ExtCtxInit,(PBS3EXTCTX pExtCtx, uint16_t cbExtCtx, uint64_t fFlags))
{
Bs3MemSet(pExtCtx, 0, cbExtCtx);
if (cbExtCtx >= RT_UOFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FXSTATE) + sizeof(X86XSAVEHDR))
{
BS3_ASSERT(fFlags & XSAVE_C_X87);
pExtCtx->enmMethod = BS3EXTCTXMETHOD_XSAVE;
pExtCtx->Ctx.x.Hdr.bmXState = fFlags;
/* Setting bit 6 (0x40) here as it kept sneaking in when loading/saving state in 16-bit and v8086 mode. */
pExtCtx->Ctx.x.x87.FCW = X86_FCW_RC_NEAREST | X86_FCW_PC_64 /* go figure:*/ | RT_BIT(6);
pExtCtx->Ctx.x.x87.MXCSR = X86_MXCSR_RC_NEAREST;
pExtCtx->Ctx.x.x87.MXCSR_MASK = 0xffff;
}
else if (cbExtCtx >= RT_UOFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FXSTATE))
{
BS3_ASSERT(fFlags == 0);
pExtCtx->enmMethod = BS3EXTCTXMETHOD_FXSAVE;
pExtCtx->Ctx.x87.FCW = X86_FCW_RC_NEAREST | X86_FCW_PC_64 /* go figure:*/ | RT_BIT(6);
pExtCtx->Ctx.x87.MXCSR = X86_MXCSR_RC_NEAREST;
pExtCtx->Ctx.x87.MXCSR_MASK = 0xffff;
}
else
{
BS3_ASSERT(fFlags == 0);
BS3_ASSERT(cbExtCtx >= RT_UOFFSETOF(BS3EXTCTX, Ctx) + sizeof(X86FPUSTATE));
pExtCtx->enmMethod = BS3EXTCTXMETHOD_ANCIENT;
pExtCtx->Ctx.Ancient.FCW = X86_FCW_RC_NEAREST | X86_FCW_PC_64 /* go figure:*/ | RT_BIT(6);
pExtCtx->Ctx.Ancient.FTW = UINT16_MAX; /* all registers empty */
}
pExtCtx->cb = cbExtCtx;
pExtCtx->u16Magic = BS3EXTCTX_MAGIC;
pExtCtx->fXcr0Nominal = fFlags;
pExtCtx->fXcr0Saved = fFlags;
return pExtCtx;
}
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