xref: /linux/arch/x86/math-emu/control_w.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*---------------------------------------------------------------------------+
3  |  control_w.h                                                              |
4  |                                                                           |
5  | Copyright (C) 1992,1993                                                   |
6  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
7  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
8  |                                                                           |
9  +---------------------------------------------------------------------------*/
10 
11 #ifndef _CONTROLW_H_
12 #define _CONTROLW_H_
13 
14 #ifdef __ASSEMBLY__
15 #define	_Const_(x)	$##x
16 #else
17 #define	_Const_(x)	x
18 #endif
19 
20 #define CW_RC		_Const_(0x0C00)	/* rounding control */
21 #define CW_PC		_Const_(0x0300)	/* precision control */
22 
23 #define CW_Precision	Const_(0x0020)	/* loss of precision mask */
24 #define CW_Underflow	Const_(0x0010)	/* underflow mask */
25 #define CW_Overflow	Const_(0x0008)	/* overflow mask */
26 #define CW_ZeroDiv	Const_(0x0004)	/* divide by zero mask */
27 #define CW_Denormal	Const_(0x0002)	/* denormalized operand mask */
28 #define CW_Invalid	Const_(0x0001)	/* invalid operation mask */
29 
30 #define CW_Exceptions  	_Const_(0x003f)	/* all masks */
31 
32 #define RC_RND		_Const_(0x0000)
33 #define RC_DOWN		_Const_(0x0400)
34 #define RC_UP		_Const_(0x0800)
35 #define RC_CHOP		_Const_(0x0C00)
36 
37 /* p 15-5: Precision control bits affect only the following:
38    ADD, SUB(R), MUL, DIV(R), and SQRT */
39 #define PR_24_BITS        _Const_(0x000)
40 #define PR_53_BITS        _Const_(0x200)
41 #define PR_64_BITS        _Const_(0x300)
42 #define PR_RESERVED_BITS  _Const_(0x100)
43 /* FULL_PRECISION simulates all exceptions masked */
44 #define FULL_PRECISION  (PR_64_BITS | RC_RND | 0x3f)
45 
46 #endif /* _CONTROLW_H_ */
47