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/* $Id: bs3-cmn-Trap32Init.c $ */
/** @file
* BS3Kit - Bs3Trap32Init
*/
/*
* 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"
/*********************************************************************************************************************************
* External Symbols *
*********************************************************************************************************************************/
#define g_Bs3Trap32DoubleFaultHandlerFlatAddr BS3_DATA_NM(g_Bs3Trap32DoubleFaultHandlerFlatAddr)
extern uint32_t g_Bs3Trap32DoubleFaultHandlerFlatAddr;
#undef Bs3Trap32Init
BS3_CMN_DEF(void, Bs3Trap32Init,(void))
{
X86TSS32 BS3_FAR *pTss;
unsigned iIdt;
/*
* IDT entries, except the system call gate.
*/
for (iIdt = 0; iIdt < BS3_TRAP_SYSCALL; iIdt++)
Bs3Trap32SetGate(iIdt, X86_SEL_TYPE_SYS_386_INT_GATE, 0 /*bDpl*/,
BS3_SEL_R0_CS32, g_Bs3Trap32GenericEntriesFlatAddr + iIdt * 10, 0 /*cParams*/);
for (iIdt = BS3_TRAP_SYSCALL + 1; iIdt < 256; iIdt++)
Bs3Trap32SetGate(iIdt, X86_SEL_TYPE_SYS_386_INT_GATE, 0 /*bDpl*/,
BS3_SEL_R0_CS32, g_Bs3Trap32GenericEntriesFlatAddr + iIdt * 10, 0 /*cParams*/);
/*
* Initialize the normal TSS so we can do ring transitions via the IDT.
*/
pTss = &Bs3Tss32;
Bs3MemZero(pTss, sizeof(*pTss));
pTss->esp0 = BS3_ADDR_STACK_R0;
pTss->ss0 = BS3_SEL_R0_SS32;
pTss->esp1 = BS3_ADDR_STACK_R1;
pTss->ss1 = BS3_SEL_R1_SS32 | 1;
pTss->esp2 = BS3_ADDR_STACK_R2;
pTss->ss2 = BS3_SEL_R2_SS32 | 2;
/*
* Initialize the double fault TSS.
* cr3 is filled in by switcher code, when needed.
*/
pTss = &Bs3Tss32DoubleFault;
Bs3MemZero(pTss, sizeof(*pTss));
pTss->esp0 = BS3_ADDR_STACK_R0;
pTss->ss0 = BS3_SEL_R0_SS32;
pTss->esp1 = BS3_ADDR_STACK_R1;
pTss->ss1 = BS3_SEL_R1_SS32 | 1;
pTss->esp2 = BS3_ADDR_STACK_R2;
pTss->ss2 = BS3_SEL_R2_SS32 | 2;
pTss->eip = g_Bs3Trap32DoubleFaultHandlerFlatAddr;
pTss->eflags = X86_EFL_1;
pTss->esp = BS3_ADDR_STACK_R0_IST1;
pTss->es = BS3_SEL_R0_DS32;
pTss->ds = BS3_SEL_R0_DS32;
pTss->cs = BS3_SEL_R0_CS32;
pTss->ss = BS3_SEL_R0_SS32;
Bs3Trap32SetGate(X86_XCPT_DF, X86_SEL_TYPE_SYS_TASK_GATE, 0 /*bDpl*/, BS3_SEL_TSS32_DF, 0, 0 /*cParams*/);
}
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