89 lines
2.4 KiB
C#
89 lines
2.4 KiB
C#
///////////////////////////////////////////////////////////////////////////////
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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: Rsdt.cs
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//
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// Note:
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// Page 93 of ACPI 3.0 Spec.
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namespace Microsoft.Singularity.Hal.Acpi
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{
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using System;
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using Microsoft.Singularity.Io;
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public class Rsdt
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{
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protected IoMemory region;
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private SystemTableHeader header;
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protected Rsdt(IoMemory region, SystemTableHeader header)
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{
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this.region = region;
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this.header = header;
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}
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public virtual int EntryCount { get { return region.Length / 4; } }
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public virtual ulong GetEntry(int index)
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{
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index *= 4;
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if (index > region.Length)
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return 0;
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return region.Read32(index);
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}
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public SystemTableHeader GetTableHeader(int index)
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{
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ulong address = GetEntry(index);
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if (address == 0)
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return null;
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return SystemTableHeader.Create(address);
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}
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public static Rsdt Create(SystemTableHeader header)
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{
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DebugStub.Assert(header.Signature == "RSDT");
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return new Rsdt(
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IoMemory.MapPhysicalMemory(
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header.PostHeaderAddress, header.PostHeaderLength,
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true, false
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),
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header
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);
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}
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}
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public class Xsdt : Rsdt
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{
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private Xsdt(IoMemory region, SystemTableHeader header)
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: base(region, header)
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{
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// Nothing to do
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}
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public override int EntryCount { get { return region.Length / 8; } }
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public override ulong GetEntry(int index)
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{
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index *= 8;
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if (index > region.Length)
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return 0;
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return region.Read64(index);
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}
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public new static Xsdt Create(SystemTableHeader header)
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{
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DebugStub.Assert(header.Signature == "XSDT");
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return new Xsdt(
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IoMemory.MapPhysicalMemory(
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header.PostHeaderAddress, header.PostHeaderLength,
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true, false
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),
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header
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);
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}
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}
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}
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