| 1 | /* $Id: bs3-cmn-Trap32Init.c 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3Trap32Init
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include "bs3kit-template-header.h"
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| 42 |
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| 43 |
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| 44 | /*********************************************************************************************************************************
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| 45 | * External Symbols *
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| 46 | *********************************************************************************************************************************/
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| 47 | #define g_Bs3Trap32DoubleFaultHandlerFlatAddr BS3_DATA_NM(g_Bs3Trap32DoubleFaultHandlerFlatAddr)
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| 48 | extern uint32_t g_Bs3Trap32DoubleFaultHandlerFlatAddr;
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| 49 |
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| 50 |
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| 51 | #undef Bs3Trap32Init
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| 52 | BS3_CMN_DEF(void, Bs3Trap32Init,(void))
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| 53 | {
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| 54 | X86TSS32 BS3_FAR *pTss;
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| 55 | unsigned iIdt;
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| 56 |
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| 57 | /*
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| 58 | * IDT entries, except the system call gate.
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| 59 | */
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| 60 | for (iIdt = 0; iIdt < BS3_TRAP_SYSCALL; iIdt++)
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| 61 | Bs3Trap32SetGate(iIdt, X86_SEL_TYPE_SYS_386_INT_GATE, 0 /*bDpl*/,
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| 62 | BS3_SEL_R0_CS32, g_Bs3Trap32GenericEntriesFlatAddr + iIdt * 10, 0 /*cParams*/);
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| 63 | for (iIdt = BS3_TRAP_SYSCALL + 1; iIdt < 256; iIdt++)
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| 64 | Bs3Trap32SetGate(iIdt, X86_SEL_TYPE_SYS_386_INT_GATE, 0 /*bDpl*/,
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| 65 | BS3_SEL_R0_CS32, g_Bs3Trap32GenericEntriesFlatAddr + iIdt * 10, 0 /*cParams*/);
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| 66 |
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| 67 | /*
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| 68 | * Initialize the normal TSS so we can do ring transitions via the IDT.
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| 69 | */
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| 70 | pTss = &Bs3Tss32;
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| 71 | Bs3MemZero(pTss, sizeof(*pTss));
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| 72 | pTss->esp0 = BS3_ADDR_STACK_R0;
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| 73 | pTss->ss0 = BS3_SEL_R0_SS32;
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| 74 | pTss->esp1 = BS3_ADDR_STACK_R1;
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| 75 | pTss->ss1 = BS3_SEL_R1_SS32 | 1;
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| 76 | pTss->esp2 = BS3_ADDR_STACK_R2;
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| 77 | pTss->ss2 = BS3_SEL_R2_SS32 | 2;
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| 78 |
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| 79 | /*
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| 80 | * Initialize the double fault TSS.
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| 81 | * cr3 is filled in by switcher code, when needed.
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| 82 | */
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| 83 | pTss = &Bs3Tss32DoubleFault;
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| 84 | Bs3MemZero(pTss, sizeof(*pTss));
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| 85 | pTss->esp0 = BS3_ADDR_STACK_R0;
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| 86 | pTss->ss0 = BS3_SEL_R0_SS32;
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| 87 | pTss->esp1 = BS3_ADDR_STACK_R1;
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| 88 | pTss->ss1 = BS3_SEL_R1_SS32 | 1;
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| 89 | pTss->esp2 = BS3_ADDR_STACK_R2;
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| 90 | pTss->ss2 = BS3_SEL_R2_SS32 | 2;
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| 91 | pTss->eip = g_Bs3Trap32DoubleFaultHandlerFlatAddr;
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| 92 | pTss->eflags = X86_EFL_1;
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| 93 | pTss->esp = BS3_ADDR_STACK_R0_IST1;
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| 94 | pTss->es = BS3_SEL_R0_DS32;
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| 95 | pTss->ds = BS3_SEL_R0_DS32;
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| 96 | pTss->cs = BS3_SEL_R0_CS32;
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| 97 | pTss->ss = BS3_SEL_R0_SS32;
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| 98 |
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| 99 | Bs3Trap32SetGate(X86_XCPT_DF, X86_SEL_TYPE_SYS_TASK_GATE, 0 /*bDpl*/, BS3_SEL_TSS32_DF, 0, 0 /*cParams*/);
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| 100 | }
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| 101 |
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