File: /usr/src/linux/include/asm-ia64/fpu.h

1     #ifndef _ASM_IA64_FPU_H
2     #define _ASM_IA64_FPU_H
3     
4     /*
5      * Copyright (C) 1998, 1999 Hewlett-Packard Co
6      * Copyright (C) 1998, 1999 David Mosberger-Tang <davidm@hpl.hp.com>
7      */
8     
9     #include <asm/types.h>
10     
11     /* floating point status register: */
12     #define FPSR_TRAP_VD	(1 << 0)	/* invalid op trap disabled */
13     #define FPSR_TRAP_DD	(1 << 1)	/* denormal trap disabled */
14     #define FPSR_TRAP_ZD	(1 << 2)	/* zero-divide trap disabled */
15     #define FPSR_TRAP_OD	(1 << 3)	/* overflow trap disabled */
16     #define FPSR_TRAP_UD	(1 << 4)	/* underflow trap disabled */
17     #define FPSR_TRAP_ID	(1 << 5)	/* inexact trap disabled */
18     #define FPSR_S0(x)	((x) <<  6)
19     #define FPSR_S1(x)	((x) << 19)
20     #define FPSR_S2(x)	(__IA64_UL(x) << 32)
21     #define FPSR_S3(x)	(__IA64_UL(x) << 45)
22     
23     /* floating-point status field controls: */
24     #define FPSF_FTZ	(1 << 0)		/* flush-to-zero */
25     #define FPSF_WRE	(1 << 1)		/* widest-range exponent */
26     #define FPSF_PC(x)	(((x) & 0x3) << 2)	/* precision control */
27     #define FPSF_RC(x)	(((x) & 0x3) << 4)	/* rounding control */
28     #define FPSF_TD		(1 << 6)		/* trap disabled */
29     
30     /* floating-point status field flags: */
31     #define FPSF_V		(1 <<  7)		/* invalid operation flag */
32     #define FPSF_D		(1 <<  8)		/* denormal/unnormal operand flag */
33     #define FPSF_Z		(1 <<  9)		/* zero divide (IEEE) flag */
34     #define FPSF_O		(1 << 10)		/* overflow (IEEE) flag */
35     #define FPSF_U		(1 << 11)		/* underflow (IEEE) flag */
36     #define FPSF_I		(1 << 12)		/* inexact (IEEE) flag) */
37     
38     /* floating-point rounding control: */
39     #define FPRC_NEAREST	0x0
40     #define FPRC_NEGINF	0x1
41     #define FPRC_POSINF	0x2
42     #define FPRC_TRUNC	0x3
43     
44     #define FPSF_DEFAULT	(FPSF_PC (0x3) | FPSF_RC (FPRC_NEAREST))
45     
46     /* This default value is the same as HP-UX uses.  Don't change it
47        without a very good reason.  */
48     #define FPSR_DEFAULT	(FPSR_TRAP_VD | FPSR_TRAP_DD | FPSR_TRAP_ZD	\
49     			 | FPSR_TRAP_OD | FPSR_TRAP_UD | FPSR_TRAP_ID	\
50     			 | FPSR_S0 (FPSF_DEFAULT)			\
51     			 | FPSR_S1 (FPSF_DEFAULT | FPSF_TD | FPSF_WRE)	\
52     			 | FPSR_S2 (FPSF_DEFAULT | FPSF_TD)		\
53     			 | FPSR_S3 (FPSF_DEFAULT | FPSF_TD))
54     
55     # ifndef __ASSEMBLY__
56     
57     struct ia64_fpreg {
58     	union {
59     		unsigned long bits[2];
60     	} u;
61     } __attribute__ ((aligned (16)));
62     
63     # endif /* __ASSEMBLY__ */
64     
65     #endif /* _ASM_IA64_FPU_H */
66