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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*---------------------------------------------------------------------------+
2 | status_w.h |
3 | |
4 | Copyright (C) 1992,1993 |
5 | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
6 | Australia. E-mail billm@vaxc.cc.monash.edu.au |
7 | |
8 +---------------------------------------------------------------------------*/
9
10#ifndef _STATUS_H_
11#define _STATUS_H_
12
Ingo Molnar3d0d14f2008-01-30 13:30:11 +010013#include "fpu_emu.h" /* for definition of PECULIAR_486 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#ifdef __ASSEMBLY__
16#define Const__(x) $##x
17#else
18#define Const__(x) x
19#endif
20
21#define SW_Backward Const__(0x8000) /* backward compatibility */
22#define SW_C3 Const__(0x4000) /* condition bit 3 */
23#define SW_Top Const__(0x3800) /* top of stack */
24#define SW_Top_Shift Const__(11) /* shift for top of stack bits */
25#define SW_C2 Const__(0x0400) /* condition bit 2 */
26#define SW_C1 Const__(0x0200) /* condition bit 1 */
27#define SW_C0 Const__(0x0100) /* condition bit 0 */
28#define SW_Summary Const__(0x0080) /* exception summary */
29#define SW_Stack_Fault Const__(0x0040) /* stack fault */
30#define SW_Precision Const__(0x0020) /* loss of precision */
31#define SW_Underflow Const__(0x0010) /* underflow */
32#define SW_Overflow Const__(0x0008) /* overflow */
33#define SW_Zero_Div Const__(0x0004) /* divide by zero */
34#define SW_Denorm_Op Const__(0x0002) /* denormalized operand */
35#define SW_Invalid Const__(0x0001) /* invalid operation */
36
Ingo Molnar3d0d14f2008-01-30 13:30:11 +010037#define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#ifndef __ASSEMBLY__
40
41#define COMP_A_gt_B 1
42#define COMP_A_eq_B 2
43#define COMP_A_lt_B 3
44#define COMP_No_Comp 4
45#define COMP_Denormal 0x20
46#define COMP_NaN 0x40
47#define COMP_SNaN 0x80
48
49#define status_word() \
50 ((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))
Randy Dunlap31016732007-02-13 13:26:24 +010051static inline void setcc(int cc)
52{
Ingo Molnar3d0d14f2008-01-30 13:30:11 +010053 partial_status &= ~(SW_C0 | SW_C1 | SW_C2 | SW_C3);
54 partial_status |= (cc) & (SW_C0 | SW_C1 | SW_C2 | SW_C3);
Randy Dunlap31016732007-02-13 13:26:24 +010055}
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57#ifdef PECULIAR_486
58 /* Default, this conveys no information, but an 80486 does it. */
59 /* Clear the SW_C1 bit, "other bits undefined". */
60# define clear_C1() { partial_status &= ~SW_C1; }
61# else
62# define clear_C1()
63#endif /* PECULIAR_486 */
64
65#endif /* __ASSEMBLY__ */
66
67#endif /* _STATUS_H_ */