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110 lines
2.2 KiB
110 lines
2.2 KiB
// TITLE("Halt Interrupt Support")
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//++
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//
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// Copyright (c) 1992 Digital Equipment Corporation
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// Copyright (c) 1993 Digital Equipment Corporation
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//
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// Module Name:
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//
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// haltsup.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 field halt button
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// interrupts.
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//
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// Author:
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//
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// Joe Notarangelo 18-Dec-1992
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//
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// Environment:
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//
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// Kernel mode only, IRQL halt synchronization level.
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//
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// Revision History:
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//
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//--
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#if !(DBG)
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//
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// Boolean value that controls whether to break or not for a halt button
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// interrupt on a free build. The default value is zero and must be set
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// in the debugger to a non-zero value to trigger the breakpoint action
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// when the halt button is pressed.
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//
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.data
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.globl HalpHaltButtonBreak
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HalpHaltButtonBreak:
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.long 0 : 1
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#endif //!DBG
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#include "halalpha.h"
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SBTTL("Halt Interrupt Support")
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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 a halt interrupt caused by
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// a human pushing the halt switch on the system box. This routine is
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// connected directly into the IDT. The halt interrupt is mechanical and
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// does not require an interrupt acknowledge.
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//
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// Arguments:
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//
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// s6/fp - 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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.struct 0
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HaltRa: .space 8 // saved return address
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.space 8 // fill for alignment
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HaltFrameLength:
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NESTED_ENTRY(HalpHaltInterrupt, ExceptionFrameLength, zero)
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lda sp, -HaltFrameLength(sp) // allocate stack frame
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stq ra, HaltRa(sp) // save ra
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PROLOGUE_END
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#if DBG
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//
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// Always stop in the debugger if this is a checked build.
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//
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BREAK_DEBUG_STOP // stop in the debugger
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#else
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//
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// If this is a free build then check the variable HalpHaltButtonBreak,
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// if it is non-zero then take the breakpoint, otherwise ignore it.
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//
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lda t0, HalpHaltButtonBreak // get the address of the boolean
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ldl t0, 0(t0) // read the boolean
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beq t0, 10f // if eq, don't stop
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BREAK_DEBUG_STOP // stop in the debugger
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10:
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#endif //DBG
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ldq ra, HaltRa(sp) // save ra
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lda sp, HaltFrameLength(sp) // deallocate stack frame
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ret zero, (ra) // interrupt is dismissed
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.end HalpHaltInterrupt
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