VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMR0/CPUMR0.cpp@ 847

Last change on this file since 847 was 23, checked in by vboxsync, 18 years ago

string.h & stdio.h + header cleanups.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.3 KB
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1/* $Id: CPUMR0.cpp 23 2007-01-15 14:08:28Z vboxsync $ */
2/** @file
3 * CPUM - Host Context Ring 0.
4 */
5
6/*
7 * Copyright (C) 2006 InnoTek Systemberatung 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 */
48CPUMR0DECL(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
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