/* mduLib.c - LSI CW4000 MDU support *//* Copyright 1984-2001 Wind River Systems, Inc. */#include "copyright_wrs.h"/* * This file has been developed or significantly modified by the * MIPS Center of Excellence Dedicated Engineering Staff. * This notice is as per the MIPS Center of Excellence Master Partner * Agreement, do not remove this notice without checking first with * WR/Platforms MIPS Center of Excellence engineering management. *//*modification history--------------------01c,16jul01,ros  add CofE comment01b,07may97,mem changed return type of mduProbe() to int; 		moved decl of mdu_present to gccMathALib.s.01a,11apr96,mem written.*//*DESCRIPTIONSEE ALSO: gccMathALib*//* includes */#include "vxWorks.h"#include "iv.h"#include "intLib.h"#include "taskLib.h"#include "intLib.h"#include "setjmp.h"#include "private/funcBindP.h"/* externs */IMPORT	BOOL	_mdu_present;/* locals */LOCAL	jmp_buf	_mduJmpbuf;/* forward declarations */IMPORT	int	__mduProbe (void);LOCAL	void	mduProbeTrap (void);/******************************************************************************** mduProbeTrap - return from failed mdu probe** RETURNS: N/A*/LOCAL void mduProbeTrap ()    {    _func_excBaseHook = 0;    longjmp (_mduJmpbuf, 1);    }/******************************************************************************** mduProbe - determine if the MDU module is present.** RETURNS:* TRUE if the MDU is present in the system, and FALSE otherwise.*/int mduProbe()    {    volatile int lvl;    volatile FUNCPTR oldHook;    lvl = intLock ();    oldHook = _func_excBaseHook;    if (setjmp (_mduJmpbuf) != 0)	{	/* an exception occured - no MDU present */	_mdu_present = FALSE;	}    else	{	/* Install our exception handler. */	_func_excBaseHook = (FUNCPTR) mduProbeTrap;	/* do the actual probe */	__mduProbe();	/* If we got this far, the MDU is present */	_mdu_present = TRUE;	}    /* Restore the old exception handler and return. */    _func_excBaseHook = oldHook;    intUnlock (lvl);    return (_mdu_present == TRUE) ? 1 : 0;}