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/* $Id: bs3-apic-1.c $ */
/** @file
* BS3Kit - bs3-apic-1, 16-bit C code.
*/
/*
* 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.h>
#include <iprt/asm-amd64-x86.h>
#include <iprt/x86.h>
/*********************************************************************************************************************************
* Internal Functions *
*********************************************************************************************************************************/
BS3_DECL_CALLBACK(void) ProtModeApicTests(void);
BS3_DECL(void) Main_rm()
{
Bs3InitAll_rm();
Bs3TestInit("bs3-apic-1");
Bs3TestPrintf("g_uBs3CpuDetected=%#x\n", g_uBs3CpuDetected);
Bs3TestSub("real-mode");
/*
* Check that there is an APIC
*/
if (!(g_uBs3CpuDetected & BS3CPU_F_CPUID))
Bs3TestFailed("CPUID not supported");
else if (!(ASMCpuId_EDX(1) & X86_CPUID_FEATURE_EDX_MSR))
Bs3TestFailed("No APIC: RDMSR/WRMSR not supported!");
else if (!(ASMCpuId_EDX(1) & X86_CPUID_FEATURE_EDX_APIC))
Bs3TestFailed("No APIC: CPUID(1) does not have EDX_APIC set!\n");
else
{
uint64_t uApicBase2;
uint64_t uApicBase = ASMRdMsr(MSR_IA32_APICBASE);
Bs3TestPrintf("MSR_IA32_APICBASE=%#RX64 %s, %s cpu%s\n",
uApicBase,
uApicBase & MSR_IA32_APICBASE_EN ? "enabled" : "disabled",
uApicBase & MSR_IA32_APICBASE_BSP ? "bootstrap" : "slave",
uApicBase & MSR_IA32_APICBASE_EXTD ? ", x2apic" : "",
(uApicBase & X86_PAGE_4K_BASE_MASK) == MSR_IA32_APICBASE_ADDR ? ", !non-default address!" : "");
/* Disable the APIC (according to wiki.osdev.org/APIC, disabling the
APIC could require a CPU reset to re-enable it, but it works for us): */
ASMWrMsr(MSR_IA32_APICBASE, uApicBase & ~(uint64_t)MSR_IA32_APICBASE_EN);
uApicBase2 = ASMRdMsr(MSR_IA32_APICBASE);
if (uApicBase2 == (uApicBase & ~(uint64_t)MSR_IA32_APICBASE_EN))
Bs3TestPrintf("Disabling worked.\n");
else
Bs3TestFailedF("Disabling the APIC did not work (%#RX64)", uApicBase2);
/* Enabling the APIC: */
ASMWrMsr(MSR_IA32_APICBASE, uApicBase | MSR_IA32_APICBASE_EN);
uApicBase2 = ASMRdMsr(MSR_IA32_APICBASE);
if (uApicBase2 == (uApicBase | MSR_IA32_APICBASE_EN))
{
Bs3TestPrintf("Enabling worked.\n");
/*
* Do the rest of the testing in protected mode since we cannot
* (easily) access the APIC address from real mode.
*/
Bs3SwitchTo32BitAndCallC_rm(ProtModeApicTests, 0);
}
else
Bs3TestFailedF("Enabling the APIC did not work (%#RX64)", uApicBase2);
}
Bs3TestTerm();
Bs3Shutdown();
}
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