90 lines
3.1 KiB
C#
90 lines
3.1 KiB
C#
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///////////////////////////////////////////////////////////////////////////////
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//
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// Microsoft Research Singularity
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// File: HalDevicesFactory.cs
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//
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// Constructs the correct HAL implementation based on system configuation.
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//
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using System;
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using System.Collections;
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using System.Diagnostics;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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using System.Threading;
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using Microsoft.Singularity;
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using Microsoft.Singularity.Hal;
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using Microsoft.Singularity.Io;
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using Microsoft.Singularity.Isal;
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namespace Microsoft.Singularity.Hal
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{
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[CLSCompliant(false)]
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public sealed class HalDevicesFactory
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{
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public static HalDevices devices = null;
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public static bool apic = false; // True if APIC is present
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public static object Initialize(Processor processor)
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{
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if (processor.Id == 0) {
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// We have hardware PICS, determine which kind
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//
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// Detect if an APIC is present on the CPU
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//
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// From 8.4.2 Presence of the Local APIC on page 337 of the
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// Intel 64 and IA-32 Architectures Software Developers Manual
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//
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// function (1) -> eax
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// cpuid
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// eax -> p0
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// ebx -> p1
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// ecx -> p2
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// edx -> p3 Bit 9 set if APIC present
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//
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//
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// Note: It has been noted that some older motherboards
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// may have an APIC capable processor, but a chipset
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// that does not properly support the APIC interrupt
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// protocol. These motherboards will remove the APIC
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// hardware tables from the ACPI tables as an indication
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// that the APIC present on the processor should not
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// be used. Of course these are uni-processor only
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// motherboards without hyperthreading or multiple-cores.
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//
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uint p0, p1, p2, p3;
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Isa.ReadCpuid((uint)1, out p0, out p1, out p2, out p3);
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if (((p3 >> 9) & 0x1) != 0) {
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apic = true;
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DebugStub.Print("HalDevices: CPUID says APIC present\n");
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}
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else {
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apic = false;
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DebugStub.Print("HalDevices: CPUID says APIC NOT present\n");
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}
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// Dynamically select the proper hardware support drivers
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if (apic) {
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devices = HalDevicesApic.Create();
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}
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else {
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devices = HalDevicesLegacyPC.Create();
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}
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}
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// This happens for all processors
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devices.Initialize(processor);
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return devices;
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}
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}
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}
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