93 lines
2.7 KiB
C#
93 lines
2.7 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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using System;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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namespace Microsoft.Singularity.Isal.IX
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{
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[NoCCtor]
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[AccessedByRuntime("referenced in c++")]
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[CLSCompliant(false)]
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[StructAlign(16)]
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[StructLayout(LayoutKind.Sequential, Pack=1,
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#if ISA_IX86
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Size=256*8 // sizeof(Idte)
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#else
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Size=256*16 // sizeof(Idte)
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#endif
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)]
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public struct InterruptTable
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{
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// Dispatcher is an opaque declaration of a code fragment which normalizes
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// the stack with the interrupt id, then dispatches to the centralized dispatch routine.
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[AccessedByRuntime("referenced in asm")]
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[StructLayout(LayoutKind.Sequential, Pack=1, Size=16)]
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private struct Dispatcher
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{
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byte first;
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}
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// There are a total of 256 entries; this is controled by the StructLayout attribute above.
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Idte entry0;
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unsafe Idte *GetStart()
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{
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fixed (Idte *p = &entry0)
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return p;
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}
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unsafe Idte *GetEnd()
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{
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fixed (Idte *p = &entry0)
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return p+256;
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}
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[AccessedByRuntime("defined in idt.asm")]
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[MethodImpl(MethodImplOptions.InternalCall)]
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[GCAnnotation(GCOption.NOGC)]
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[StackBound(16)]
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[NoHeapAllocation]
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private extern unsafe static Dispatcher *GetDispatchers();
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[NoHeapAllocation]
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public void Initialize()
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{
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unsafe {
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Dispatcher *d = GetDispatchers();
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fixed (Idte *first = &entry0) {
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Idte *p = first;
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Idte *pEnd = p + 256;
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while (p < pEnd) {
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InitializeEntry(ref *p, (UIntPtr) d);
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p++;
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d++;
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}
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}
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}
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}
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[NoHeapAllocation]
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public static void InitializeEntry(ref Idte entry, UIntPtr address)
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{
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entry.offset_0_15 = (ushort) address;
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entry.offset_16_31 = (ushort) (((uint) address) >> 16);
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#if ISA_IX64
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entry.offset_32_63 = (uint) (((ulong)address) >> 32);
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#endif
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entry.selector = (ushort) Isa.GetCs();
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entry.flags = 0;
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entry.access = (byte) (Idte.PRESENT | Idte.DPL_RING0 | Idte.INT_GATE);
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}
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}
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}
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