src/arch/xtensa/up/xtos/int-vector.S

// int-vector.S  -  Interrupt Vector Template (for levels > 1)
// $Id: //depot/rel/Eaglenest/Xtensa/OS/xtos/int-vector.S#2 $

// Copyright (c) 2003-2004, 2006, 2010 Tensilica Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


// To use this template file, define a macro called _INTERRUPT_LEVEL
// to be the interrupt level of the vector, include "xtos-internal.h",
// then include this file.  We use the same template for both high-level
// and medium-level interrupts, but not debug level.


#define _ASMLANGUAGE
#include "xtos-internal.h"
#include <xtensa/coreasm.h>
#include <xtensa/config/system.h>


#if XCHAL_HAVE_INTERRUPTS && (_INTERRUPT_LEVEL <= XCHAL_NUM_INTLEVELS) && (_INTERRUPT_LEVEL != XCHAL_DEBUGLEVEL)

	.begin	literal_prefix	LABEL(.Level,InterruptVector)
	.section		LABEL(.Level,InterruptVector.text), "ax"
	.align 4
	.global	LABEL(_Level,Vector)
LABEL(_Level,Vector):
	//  Medium and high priority interrupt vector:

	isync_erratum453
# if HAVE_XSR
	//  With XSR, we can use this vector which has the advantage of being ROMable
	//  without requiring the handler to also be in ROM; however, it requires
	//  initializing the EXCSAVEn register (see ResetEpilog.S) and a slightly
	//  different save/restore sequence in the handler:
	xsr	a2, EXCSAVE_LEVEL
	jx	a2

	//  Pull-in the real handler by reference, to ensure the reset epilog gets it:
	.global	LABEL(_Level,FromVector)

# else
	wsr	a2, EXCSAVE_LEVEL
	movi	a2, LABEL(_Level,FromVector)
	jx	a2
# endif

	.size	LABEL(_Level,Vector), . - LABEL(_Level,Vector)
	.text
	.end	literal_prefix

#endif /* interrupt at that level */