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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxInit.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxInit.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxInit.c new file mode 100644 index 00000000..944f6d45 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-ExtCtxInit.c @@ -0,0 +1,84 @@ +/* $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; +} + |