| 1 | /* $Id: CPUMR0.cpp 2981 2007-06-01 16:01:28Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * CPUM - Host Context Ring 0.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 innotek GmbH
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License as published by the Free Software Foundation,
|
|---|
| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
|
|---|
| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
|
|---|
| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * If you received this file as part of a commercial VirtualBox
|
|---|
| 18 | * distribution, then only the terms of your commercial VirtualBox
|
|---|
| 19 | * license agreement apply instead of the previous paragraph.
|
|---|
| 20 | */
|
|---|
| 21 |
|
|---|
| 22 |
|
|---|
| 23 | /*******************************************************************************
|
|---|
| 24 | * Header Files *
|
|---|
| 25 | *******************************************************************************/
|
|---|
| 26 | #define LOG_GROUP LOG_GROUP_CPUM
|
|---|
| 27 | #include <VBox/cpum.h>
|
|---|
| 28 | #include "CPUMInternal.h"
|
|---|
| 29 | #include <VBox/vm.h>
|
|---|
| 30 | #include <VBox/x86.h>
|
|---|
| 31 | #include <VBox/err.h>
|
|---|
| 32 | #include <VBox/log.h>
|
|---|
| 33 | #include <iprt/assert.h>
|
|---|
| 34 | #include <iprt/asm.h>
|
|---|
| 35 |
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 |
|
|---|
| 39 | /**
|
|---|
| 40 | * Does Ring-0 CPUM initialization.
|
|---|
| 41 | *
|
|---|
| 42 | * This is mainly to check that the Host CPU mode is compatible
|
|---|
| 43 | * with VBox.
|
|---|
| 44 | *
|
|---|
| 45 | * @returns VBox status code.
|
|---|
| 46 | * @param pVM The VM to operate on.
|
|---|
| 47 | */
|
|---|
| 48 | CPUMR0DECL(int) CPUMR0Init(PVM pVM)
|
|---|
| 49 | {
|
|---|
| 50 | LogComFlow(("CPUMR0Init: %p\n", pVM));
|
|---|
| 51 |
|
|---|
| 52 | /*
|
|---|
| 53 | * Check CR0 & CR4 flags.
|
|---|
| 54 | */
|
|---|
| 55 | uint32_t u32CR0 = ASMGetCR0();
|
|---|
| 56 | if ((u32CR0 & (X86_CR0_PE | X86_CR0_PG)) != (X86_CR0_PE | X86_CR0_PG)) /* a bit paranoid perhaps.. */
|
|---|
| 57 | {
|
|---|
| 58 | LogCom(("CPUMR0Init: PE or PG not set. cr0=%#x\n", u32CR0));
|
|---|
| 59 | return VERR_UNSUPPORTED_CPU_MODE;
|
|---|
| 60 | }
|
|---|
| 61 |
|
|---|
| 62 | /*
|
|---|
| 63 | * Check for sysenter if it's used.
|
|---|
| 64 | */
|
|---|
| 65 | if (ASMHasCpuId())
|
|---|
| 66 | {
|
|---|
| 67 | uint32_t u32CpuVersion;
|
|---|
| 68 | uint32_t u32Dummy;
|
|---|
| 69 | uint32_t u32Features;
|
|---|
| 70 | ASMCpuId(1, &u32CpuVersion, &u32Dummy, &u32Dummy, &u32Features);
|
|---|
| 71 | uint32_t u32Family = u32CpuVersion >> 8;
|
|---|
| 72 | uint32_t u32Model = (u32CpuVersion >> 4) & 0xF;
|
|---|
| 73 | uint32_t u32Stepping = u32CpuVersion & 0xF;
|
|---|
| 74 |
|
|---|
| 75 | /*
|
|---|
| 76 | * Intel docs claim you should test both the flag and family, model & stepping.
|
|---|
| 77 | * Some Pentium Pro cpus have the SEP cpuid flag set, but don't support it.
|
|---|
| 78 | */
|
|---|
| 79 | if ( (u32Features & X86_CPUID_FEATURE_EDX_SEP)
|
|---|
| 80 | && !(u32Family == 6 && u32Model < 3 && u32Stepping < 3))
|
|---|
| 81 | {
|
|---|
| 82 | /*
|
|---|
| 83 | * Read the MSR and see if it's in use or not.
|
|---|
| 84 | */
|
|---|
| 85 | uint32_t u32 = ASMRdMsr_Low(MSR_IA32_SYSENTER_CS);
|
|---|
| 86 | if (u32)
|
|---|
| 87 | {
|
|---|
| 88 | pVM->cpum.s.fUseFlags |= CPUM_USE_SYSENTER;
|
|---|
| 89 | LogCom(("CPUMR0Init: host uses sysenter cs=%08x%08x\n", ASMRdMsr_High(MSR_IA32_SYSENTER_CS), u32));
|
|---|
| 90 | }
|
|---|
| 91 | }
|
|---|
| 92 |
|
|---|
| 93 | /** @todo check for AMD and syscall!!!!!! */
|
|---|
| 94 | }
|
|---|
| 95 |
|
|---|
| 96 |
|
|---|
| 97 | /*
|
|---|
| 98 | * Check if debug registers are armed.
|
|---|
| 99 | */
|
|---|
| 100 | uint32_t u32DR7 = ASMGetDR7();
|
|---|
| 101 | if (u32DR7 & X86_DR7_ENABLED_MASK)
|
|---|
| 102 | {
|
|---|
| 103 | pVM->cpum.s.fUseFlags |= CPUM_USE_DEBUG_REGS_HOST;
|
|---|
| 104 | LogCom(("CPUMR0Init: host uses debug registers (dr7=%x)\n", u32DR7));
|
|---|
| 105 | }
|
|---|
| 106 |
|
|---|
| 107 | return VINF_SUCCESS;
|
|---|
| 108 | }
|
|---|
| 109 |
|
|---|
| 110 |
|
|---|
