| 1 | /* $Id: bs3-cmn-Trap16Init.c 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3Trap16Init
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "bs3kit-template-header.h"
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| 32 |
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| 33 |
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| 34 | /*********************************************************************************************************************************
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| 35 | * Global Variables *
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| 36 | *********************************************************************************************************************************/
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| 37 | /* We ASSUME that BS3CLASS16CODE is 64KB aligned, so the low 16-bit of the
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| 38 | flat address matches. Also, these symbols are defined both with
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| 39 | and without underscore prefixes. */
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| 40 | extern BS3_DECL(void) BS3_FAR_CODE Bs3Trap16DoubleFaultHandler80386(void);
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| 41 | extern BS3_DECL(void) BS3_FAR_CODE Bs3Trap16DoubleFaultHandler80286(void);
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| 42 | extern BS3_DECL(void) BS3_FAR_CODE Bs3Trap16GenericEntries(void);
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| 43 |
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| 44 | /* These two are ugly. Need data access for patching purposes. */
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| 45 | extern uint8_t BS3_FAR_DATA bs3Trap16GenericTrapOrInt[];
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| 46 |
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| 47 |
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| 48 | #undef Bs3Trap16InitEx
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| 49 | BS3_CMN_DEF(void, Bs3Trap16InitEx,(bool f386Plus))
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| 50 | {
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| 51 | X86TSS16 BS3_FAR *pTss;
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| 52 | unsigned iIdt;
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| 53 |
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| 54 | /*
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| 55 | * If 386 or later, patch the trap handler code to not jump to the 80286
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| 56 | * code but continue with the next instruction (the 386+ code).
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| 57 | */
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| 58 | if (f386Plus)
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| 59 | {
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| 60 | uint8_t BS3_FAR_DATA *pbFunction = &bs3Trap16GenericTrapOrInt[0];
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| 61 | #if ARCH_BITS == 16
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| 62 | if (g_bBs3CurrentMode != BS3_MODE_RM)
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| 63 | pbFunction = (uint8_t BS3_FAR_DATA *)BS3_FP_MAKE(BS3_SEL_TILED + 1, BS3_FP_OFF(pbFunction));
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| 64 | #endif
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| 65 | pbFunction[1] = 0;
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| 66 | pbFunction[2] = 0;
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| 67 | }
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| 68 |
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| 69 | /*
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| 70 | * IDT entries, except the system call gate.
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| 71 | */
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| 72 | for (iIdt = 0; iIdt < 256; iIdt++)
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| 73 | if (iIdt != BS3_TRAP_SYSCALL)
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| 74 | Bs3Trap16SetGate(iIdt, X86_SEL_TYPE_SYS_286_INT_GATE, 0 /*bDpl*/,
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| 75 | BS3_SEL_R0_CS16, (uint16_t)(uintptr_t)Bs3Trap16GenericEntries + iIdt * 8, 0 /*cParams*/);
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| 76 |
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| 77 | /*
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| 78 | * Initialize the normal TSS so we can do ring transitions via the IDT.
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| 79 | */
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| 80 | pTss = &Bs3Tss16;
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| 81 | Bs3MemZero(pTss, sizeof(*pTss));
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| 82 | pTss->sp0 = BS3_ADDR_STACK_R0;
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| 83 | pTss->ss0 = BS3_SEL_R0_SS16;
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| 84 | pTss->sp1 = BS3_ADDR_STACK_R1;
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| 85 | pTss->ss1 = BS3_SEL_R1_SS16 | 1;
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| 86 | pTss->sp2 = BS3_ADDR_STACK_R2;
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| 87 | pTss->ss2 = BS3_SEL_R2_SS16 | 2;
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| 88 |
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| 89 | /*
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| 90 | * Initialize the double fault TSS.
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| 91 | * cr3 is filled in by switcher code, when needed.
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| 92 | */
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| 93 | pTss = &Bs3Tss16DoubleFault;
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| 94 | Bs3MemZero(pTss, sizeof(*pTss));
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| 95 | pTss->sp0 = BS3_ADDR_STACK_R0;
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| 96 | pTss->ss0 = BS3_SEL_R0_SS16;
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| 97 | pTss->sp1 = BS3_ADDR_STACK_R1;
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| 98 | pTss->ss1 = BS3_SEL_R1_SS16 | 1;
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| 99 | pTss->sp2 = BS3_ADDR_STACK_R2;
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| 100 | pTss->ss2 = BS3_SEL_R2_SS16 | 2;
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| 101 | pTss->ip = (uint16_t)(uintptr_t)(f386Plus ? &Bs3Trap16DoubleFaultHandler80386 : &Bs3Trap16DoubleFaultHandler80286);
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| 102 | pTss->flags = X86_EFL_1;
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| 103 | pTss->sp = BS3_ADDR_STACK_R0_IST1;
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| 104 | pTss->es = BS3_SEL_R0_DS16;
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| 105 | pTss->ds = BS3_SEL_R0_DS16;
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| 106 | pTss->cs = BS3_SEL_R0_CS16;
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| 107 | pTss->ss = BS3_SEL_R0_SS16;
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| 108 | pTss->dx = f386Plus;
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| 109 |
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| 110 | Bs3Trap16SetGate(X86_XCPT_DF, X86_SEL_TYPE_SYS_TASK_GATE, 0 /*bDpl*/, BS3_SEL_TSS16_DF, 0, 0 /*cParams*/);
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| 111 | }
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| 112 |
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| 113 |
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| 114 | #undef Bs3Trap16Init
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| 115 | BS3_CMN_DEF(void, Bs3Trap16Init,(void))
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| 116 | {
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| 117 | BS3_CMN_NM(Bs3Trap16InitEx)((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386);
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| 118 | }
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| 119 |
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