83 lines
3.4 KiB
ArmAsm
83 lines
3.4 KiB
ArmAsm
/* intboiexit.s - VxMicro spurious interrupt support for IA-32 architecture */
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/*
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* Copyright (c) 2010-2014 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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This module implements the single interrupt handling routine _IntBoiExit().
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This routine is used by some interrupt controller drivers (e.g. the Intel
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8259A driver) to short circuit the execution of normal interrupt stub
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processing when a spurious interrupt is detected.
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When a spurious interrupt condition is detected by the interrupt controller's
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"beginning of interrupt" (BOI) handler it forces a return to _IntBoiExit()
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rather than returning back to the interrupt stub. The _IntBoiExit() routine
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then pops the parameter passed to the BOI handler and branches to _IntExit(),
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thereby circumventing execution of the "application" ISR and the interrupt
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controller driver's "end of interrupt" (EOI) handler (if present).
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\INTERNAL
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The _IntBoiExit() routine is provided in a separate module so that it gets
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included in the final image only if an interrupt controller driver utilizing
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_IntBoiExit() is present.
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*/
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#define _ASMLANGUAGE
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#include <arch/x86/asm.h>
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#include <offsets.h> /* nanokernel structure offset definitions */
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/* exports (internal APIs) */
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GTEXT(_IntBoiExit)
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/* externs */
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GTEXT(_IntExit)
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/*******************************************************************************
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*
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* _IntBoiExit - exit interrupt handler stub without invoking ISR
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*
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* This routine exits an interrupt handler stub without invoking the associated
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* ISR handler (or the EOI handler, if present). It should only be jumped to
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* by an interrupt controller driver's BOI routine, and only if the BOI routine
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* is passed a single parameter by the interrupt stub.
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*
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* \INTERNAL
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* A BOI routine that has no parameters can jump directly to _IntExit().
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*/
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SECTION_FUNC(TEXT, _IntBoiExit)
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addl $4, %esp /* pop off the $BoiParameter */
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jmp FUNC(_IntExit) /* exit via kernel */
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