83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*
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* control_w.h
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*
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*
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* Copyright (C) 1992, 1993 W. Metzenthen, 22 Parker St, Ormond,
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* Vic 3163, Australia.
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* E-mail apm233m@vaxc.cc.monash.edu.au
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* All rights reserved.
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*
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* This copyright notice covers the redistribution and use of the
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* FPU emulator developed by W. Metzenthen. It covers only its use
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* in the 386BSD operating system. Any other use is not permitted
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* under this copyright.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must include information specifying
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* that source code for the emulator is freely available and include
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* either:
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* a) an offer to provide the source code for a nominal distribution
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* fee, or
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* b) list at least two alternative methods whereby the source
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* can be obtained, e.g. a publically accessible bulletin board
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* and an anonymous ftp site from which the software can be
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* downloaded.
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* 3. All advertising materials specifically mentioning features or use of
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* this emulator must acknowledge that it was developed by W. Metzenthen.
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* 4. The name of W. Metzenthen may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _CONTROLW_H_
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#define _CONTROLW_H_
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#ifdef LOCORE
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#define _Const_(x) $/**/x
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#else
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#define _Const_(x) x
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#endif
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#define CW_RC _Const_(0x0C00) /* rounding control */
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#define CW_PC _Const_(0x0300) /* precision control */
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#define CW_Precision Const_(0x0020) /* loss of precision mask */
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#define CW_Underflow Const_(0x0010) /* underflow mask */
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#define CW_Overflow Const_(0x0008) /* overflow mask */
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#define CW_ZeroDiv Const_(0x0004) /* divide by zero mask */
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#define CW_Denormal Const_(0x0002) /* denormalized operand mask */
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#define CW_Invalid Const_(0x0001) /* invalid operation mask */
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#define CW_Exceptions _Const_(0x003f) /* all masks */
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#define RC_RND _Const_(0x0000)
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#define RC_DOWN _Const_(0x0400)
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#define RC_UP _Const_(0x0800)
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#define RC_CHOP _Const_(0x0C00)
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/* p 15-5: Precision control bits affect only the following:
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ADD, SUB(R), MUL, DIV(R), and SQRT */
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#define PR_24_BITS _Const_(0x000)
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#define PR_53_BITS _Const_(0x200)
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#define PR_64_BITS _Const_(0x300)
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/* FULL_PRECISION simulates all exceptions masked */
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#define FULL_PRECISION (PR_64_BITS | RC_RND | 0x3f)
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#endif /* _CONTROLW_H_ */
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