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78 lines
1.4 KiB
78 lines
1.4 KiB
// TITLE("Jazz I/O Interrupt Dispatch")
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//++
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//
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// Copyright (c) 1990 Microsoft Corporation
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//
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// Module Name:
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//
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// jxdmadsp.s
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//
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// Abstract:
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//
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// This module implements the code necessary to do the second level dispatch
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// for I/O interrupts on Jazz.
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//
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// Author:
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//
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// David N. Cutler (davec) 12-May-1990
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//
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// Environment:
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//
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// Kernel mode only.
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//
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// Revision History:
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//
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//--
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#include "halmips.h"
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#if defined(_DUO_)
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#include "duodef.h"
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#endif
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#if defined(_JAZZ_)
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#include "jazzdef.h"
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#endif
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SBTTL("Local Device First Level Dispatch")
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//++
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//
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// Routine Description:
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//
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// This routine is entered as the result of an interrupt being generated
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// for a local device.
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//
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// Arguments:
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//
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// s8 - Supplies a pointer to a trap frame.
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//
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// Return Value:
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//
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// None.
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//
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//--
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LEAF_ENTRY(HalpDmaDispatch)
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#if defined(_DUO_)
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lbu t0,DMA_VIRTUAL_BASE + 0x48 // get interrupt source vector
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#endif
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#if defined(_JAZZ_)
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lbu t0,INTERRUPT_VIRTUAL_BASE + 0x0 // get interrupt source vector
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#endif
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lw a0,KiPcr + PcInterruptRoutine + (DEVICE_VECTORS * 4)(t0) //
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lw t1,InDispatchAddress - InDispatchCode(a0) // get dispatch address
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subu a0,a0,InDispatchCode // compute address of interrupt object
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j t1 // transfer control to interrupt routine
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.end HalpDmaDispatch
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