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/* $Id: bs3-cmn-RegCtxGetRspSsAsCurPtr.c $ */
/** @file
* BS3Kit - Bs3RegCtxGetRspSsAsCurPtr
*/
/*
* Copyright (C) 2007-2022 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 "bs3kit-template-header.h"
#undef Bs3RegCtxGetRspSsAsCurPtr
BS3_CMN_DEF(void BS3_FAR *, Bs3RegCtxGetRspSsAsCurPtr,(PBS3REGCTX pRegCtx))
{
uint64_t uFlat;
if (BS3_MODE_IS_RM_OR_V86(pRegCtx->bMode))
{
#if ARCH_BITS == 16
if (BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode))
return BS3_FP_MAKE(pRegCtx->ss, pRegCtx->rsp.u16);
#endif
uFlat = ((uint32_t)pRegCtx->ss << 4) + pRegCtx->rsp.u16;
}
else if (!BS3_MODE_IS_64BIT_CODE(pRegCtx->bMode))
uFlat = Bs3SelFar32ToFlat32(pRegCtx->rsp.u32, pRegCtx->ss);
else
uFlat = pRegCtx->rsp.u64;
#if ARCH_BITS == 16
if (uFlat >= (BS3_MODE_IS_RM_OR_V86(g_bBs3CurrentMode) ? _1M : BS3_SEL_TILED_AREA_SIZE))
return NULL;
return BS3_FP_MAKE(Bs3Sel16HighFlatPtrToSelector((uint32_t)uFlat >> 16), (uint16_t)uFlat);
#else
/* Typically no need to check limit in 32-bit mode, because 64-bit mode
just repeats the first 4GB for the rest of the address space. */
return (void *)(uintptr_t)uFlat;
#endif
}
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