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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 NetWinder Floating Point Emulator
4 (c) Rebel.com, 1998-1999
5
6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
7
8*/
9
10#ifndef __FPSR_H__
11#define __FPSR_H__
12
13/*
14The FPSR is a 32 bit register consisting of 4 parts, each exactly
15one byte.
16
17 SYSTEM ID
18 EXCEPTION TRAP ENABLE BYTE
19 SYSTEM CONTROL BYTE
20 CUMULATIVE EXCEPTION FLAGS BYTE
21
22The FPCR is a 32 bit register consisting of bit flags.
23*/
24
25/* SYSTEM ID
26------------
27Note: the system id byte is read only */
28
29typedef unsigned int FPSR; /* type for floating point status register */
30typedef unsigned int FPCR; /* type for floating point control register */
31
32#define MASK_SYSID 0xff000000
33#define BIT_HARDWARE 0x80000000
34#define FP_EMULATOR 0x01000000 /* System ID for emulator */
35#define FP_ACCELERATOR 0x81000000 /* System ID for FPA11 */
36
37/* EXCEPTION TRAP ENABLE BYTE
38----------------------------- */
39
40#define MASK_TRAP_ENABLE 0x00ff0000
41#define MASK_TRAP_ENABLE_STRICT 0x001f0000
42#define BIT_IXE 0x00100000 /* inexact exception enable */
43#define BIT_UFE 0x00080000 /* underflow exception enable */
44#define BIT_OFE 0x00040000 /* overflow exception enable */
45#define BIT_DZE 0x00020000 /* divide by zero exception enable */
46#define BIT_IOE 0x00010000 /* invalid operation exception enable */
47
48/* SYSTEM CONTROL BYTE
49---------------------- */
50
51#define MASK_SYSTEM_CONTROL 0x0000ff00
52#define MASK_TRAP_STRICT 0x00001f00
53
54#define BIT_AC 0x00001000 /* use alternative C-flag definition
55 for compares */
56#define BIT_EP 0x00000800 /* use expanded packed decimal format */
57#define BIT_SO 0x00000400 /* select synchronous operation of FPA */
58#define BIT_NE 0x00000200 /* NaN exception bit */
59#define BIT_ND 0x00000100 /* no denormalized numbers bit */
60
61/* CUMULATIVE EXCEPTION FLAGS BYTE
62---------------------------------- */
63
64#define MASK_EXCEPTION_FLAGS 0x000000ff
65#define MASK_EXCEPTION_FLAGS_STRICT 0x0000001f
66
67#define BIT_IXC 0x00000010 /* inexact exception flag */
68#define BIT_UFC 0x00000008 /* underflow exception flag */
69#define BIT_OFC 0x00000004 /* overfloat exception flag */
70#define BIT_DZC 0x00000002 /* divide by zero exception flag */
71#define BIT_IOC 0x00000001 /* invalid operation exception flag */
72
73/* Floating Point Control Register
74----------------------------------*/
75
76#define BIT_RU 0x80000000 /* rounded up bit */
77#define BIT_IE 0x10000000 /* inexact bit */
78#define BIT_MO 0x08000000 /* mantissa overflow bit */
79#define BIT_EO 0x04000000 /* exponent overflow bit */
80#define BIT_SB 0x00000800 /* store bounce */
81#define BIT_AB 0x00000400 /* arithmetic bounce */
82#define BIT_RE 0x00000200 /* rounding exception */
83#define BIT_DA 0x00000100 /* disable FPA */
84
85#define MASK_OP 0x00f08010 /* AU operation code */
86#define MASK_PR 0x00080080 /* AU precision */
87#define MASK_S1 0x00070000 /* AU source register 1 */
88#define MASK_S2 0x00000007 /* AU source register 2 */
89#define MASK_DS 0x00007000 /* AU destination register */
90#define MASK_RM 0x00000060 /* AU rounding mode */
91#define MASK_ALU 0x9cfff2ff /* only ALU can write these bits */
92#define MASK_RESET 0x00000d00 /* bits set on reset, all others cleared */
93#define MASK_WFC MASK_RESET
94#define MASK_RFC ~MASK_RESET
95
96#endif
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 NetWinder Floating Point Emulator
4 (c) Rebel.com, 1998-1999
5
6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
7
8*/
9
10#ifndef __FPSR_H__
11#define __FPSR_H__
12
13/*
14The FPSR is a 32 bit register consisting of 4 parts, each exactly
15one byte.
16
17 SYSTEM ID
18 EXCEPTION TRAP ENABLE BYTE
19 SYSTEM CONTROL BYTE
20 CUMULATIVE EXCEPTION FLAGS BYTE
21
22The FPCR is a 32 bit register consisting of bit flags.
23*/
24
25/* SYSTEM ID
26------------
27Note: the system id byte is read only */
28
29typedef unsigned int FPSR; /* type for floating point status register */
30typedef unsigned int FPCR; /* type for floating point control register */
31
32#define MASK_SYSID 0xff000000
33#define BIT_HARDWARE 0x80000000
34#define FP_EMULATOR 0x01000000 /* System ID for emulator */
35#define FP_ACCELERATOR 0x81000000 /* System ID for FPA11 */
36
37/* EXCEPTION TRAP ENABLE BYTE
38----------------------------- */
39
40#define MASK_TRAP_ENABLE 0x00ff0000
41#define MASK_TRAP_ENABLE_STRICT 0x001f0000
42#define BIT_IXE 0x00100000 /* inexact exception enable */
43#define BIT_UFE 0x00080000 /* underflow exception enable */
44#define BIT_OFE 0x00040000 /* overflow exception enable */
45#define BIT_DZE 0x00020000 /* divide by zero exception enable */
46#define BIT_IOE 0x00010000 /* invalid operation exception enable */
47
48/* SYSTEM CONTROL BYTE
49---------------------- */
50
51#define MASK_SYSTEM_CONTROL 0x0000ff00
52#define MASK_TRAP_STRICT 0x00001f00
53
54#define BIT_AC 0x00001000 /* use alternative C-flag definition
55 for compares */
56#define BIT_EP 0x00000800 /* use expanded packed decimal format */
57#define BIT_SO 0x00000400 /* select synchronous operation of FPA */
58#define BIT_NE 0x00000200 /* NaN exception bit */
59#define BIT_ND 0x00000100 /* no denormalized numbers bit */
60
61/* CUMULATIVE EXCEPTION FLAGS BYTE
62---------------------------------- */
63
64#define MASK_EXCEPTION_FLAGS 0x000000ff
65#define MASK_EXCEPTION_FLAGS_STRICT 0x0000001f
66
67#define BIT_IXC 0x00000010 /* inexact exception flag */
68#define BIT_UFC 0x00000008 /* underflow exception flag */
69#define BIT_OFC 0x00000004 /* overfloat exception flag */
70#define BIT_DZC 0x00000002 /* divide by zero exception flag */
71#define BIT_IOC 0x00000001 /* invalid operation exception flag */
72
73/* Floating Point Control Register
74----------------------------------*/
75
76#define BIT_RU 0x80000000 /* rounded up bit */
77#define BIT_IE 0x10000000 /* inexact bit */
78#define BIT_MO 0x08000000 /* mantissa overflow bit */
79#define BIT_EO 0x04000000 /* exponent overflow bit */
80#define BIT_SB 0x00000800 /* store bounce */
81#define BIT_AB 0x00000400 /* arithmetic bounce */
82#define BIT_RE 0x00000200 /* rounding exception */
83#define BIT_DA 0x00000100 /* disable FPA */
84
85#define MASK_OP 0x00f08010 /* AU operation code */
86#define MASK_PR 0x00080080 /* AU precision */
87#define MASK_S1 0x00070000 /* AU source register 1 */
88#define MASK_S2 0x00000007 /* AU source register 2 */
89#define MASK_DS 0x00007000 /* AU destination register */
90#define MASK_RM 0x00000060 /* AU rounding mode */
91#define MASK_ALU 0x9cfff2ff /* only ALU can write these bits */
92#define MASK_RESET 0x00000d00 /* bits set on reset, all others cleared */
93#define MASK_WFC MASK_RESET
94#define MASK_RFC ~MASK_RESET
95
96#endif