123 lines
4.7 KiB
C#
123 lines
4.7 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: Gdt.cs
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//
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// Note:
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//
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namespace Microsoft.Singularity.X86
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{
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using System;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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// A lgdt pointer to the tables
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//
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[CLSCompliant(false)]
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[AccessedByRuntime("referenced from c++")]
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internal struct GDTP
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{
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[AccessedByRuntime("referenced from c++")]
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internal ushort pad;
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[AccessedByRuntime("referenced from c++")]
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internal ushort limit;
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[AccessedByRuntime("referenced from c++")]
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internal uint addr;
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};
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/////////////////////////////////////////////// Segment Descriptor Tables.
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//
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// An entry in the Global Descriptor Table
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//
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[AccessedByRuntime("referenced from c++")]
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[CLSCompliant(false)]
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internal struct GDTE
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{
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[AccessedByRuntime("referenced from c++")]
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internal ushort limit;
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[AccessedByRuntime("referenced from c++")]
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internal ushort base0_15;
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[AccessedByRuntime("referenced from c++")]
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internal byte base16_23;
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[AccessedByRuntime("referenced from c++")]
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internal byte access;
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[AccessedByRuntime("referenced from c++")]
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internal byte granularity;
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[AccessedByRuntime("referenced from c++")]
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internal byte base24_31;
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// granularity bits
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[AccessedByRuntime("referenced from c++")]
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internal const uint PAGES = 0x80;
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[AccessedByRuntime("referenced from c++")]
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internal const uint IS32BIT = 0x40;
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[AccessedByRuntime("referenced from c++")]
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internal const uint IS64BIT = 0x20;
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[AccessedByRuntime("referenced from c++")]
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internal const uint LIMIT20 = 0x0f;
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// access bits
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[AccessedByRuntime("referenced from c++")]
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internal const uint PRESENT = 0x80;
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[AccessedByRuntime("referenced from c++")]
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internal const uint RING3 = 0x60;
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[AccessedByRuntime("referenced from c++")]
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internal const uint RING2 = 0x40;
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[AccessedByRuntime("referenced from c++")]
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internal const uint RING1 = 0x20;
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[AccessedByRuntime("referenced from c++")]
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internal const uint RING0 = 0x00;
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[AccessedByRuntime("referenced from c++")]
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internal const uint USER = 0x10;
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[AccessedByRuntime("referenced from c++")]
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internal const uint CODE = 0x08;
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[AccessedByRuntime("referenced from c++")]
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internal const uint CONFORMING = 0x04;
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[AccessedByRuntime("referenced from c++")]
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internal const uint EXPANDDOWN = 0x04; // Data
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[AccessedByRuntime("referenced from c++")]
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internal const uint READABLE = 0x02;
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[AccessedByRuntime("referenced from c++")]
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internal const uint WRITEABLE = 0x02; // Data
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[AccessedByRuntime("referenced from c++")]
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internal const uint ACCESSED = 0x01;
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// Non-user types:
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[AccessedByRuntime("referenced from c++")]
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internal const uint Tss16Free = 0x01;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Ldt = 0x02;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Tss16Busy = 0x03;
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[AccessedByRuntime("referenced from c++")]
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internal const uint CallGate16 = 0x04;
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[AccessedByRuntime("referenced from c++")]
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internal const uint TaskGate = 0x05;
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[AccessedByRuntime("referenced from c++")]
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internal const uint IntGate16 = 0x06;
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[AccessedByRuntime("referenced from c++")]
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internal const uint TrapGate16 = 0x07;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Reserved8 = 0x08;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Tss32Free = 0x09;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Reserved10 = 0x0a;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Tss32Busy = 0x0b;
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[AccessedByRuntime("referenced from c++")]
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internal const uint CallGate32 = 0x0c;
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[AccessedByRuntime("referenced from c++")]
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internal const uint Reserved13 = 0x0d;
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[AccessedByRuntime("referenced from c++")]
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internal const uint IntGate32 = 0x0e;
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[AccessedByRuntime("referenced from c++")]
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internal const uint TrapGate32 = 0x0f;
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}
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}
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