[apple/xnu.git] / EXTERNAL_HEADERS / architecture / i386 / fpu.h

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1992 NeXT Computer, Inc.
 *
 * Intel386 Family:	Floating Point unit.
 *
 * HISTORY
 *
 * 5 October 1992 ? at NeXT
 *	Added names to previously unamed fields in the mantissa.
 *
 * 5 April 1992 ? at NeXT
 *	Created.
 */

/*
 * Data register.
 */

typedef struct fp_data_reg {
    unsigned short		mant;
    unsigned short		mant1	:16,
				mant2	:16,
				mant3	:16;
    unsigned short		exp	:15,
			    	sign	:1;
} fp_data_reg_t;

/*
 * Data register stack.
 */

typedef struct fp_stack {
    fp_data_reg_t		ST[8];
} fp_stack_t;

/*
 * Register stack tag word.
 */

typedef struct fp_tag {
    unsigned short		tag0	:2,
    				tag1	:2,
				tag2	:2,
				tag3	:2,
    				tag4	:2,
				tag5	:2,
				tag6	:2,
				tag7	:2;
#define FP_TAG_VALID		0
#define FP_TAG_ZERO		1
#define FP_TAG_SPEC		2
#define FP_TAG_EMPTY		3
} fp_tag_t;

/*
 * Status word.
 */

typedef struct fp_status {
    unsigned short		invalid	:1,
    				denorm	:1,
				zdiv	:1,
				ovrfl	:1,
				undfl	:1,
				precis	:1,
				stkflt	:1,
				errsumm	:1,
				c0	:1,
				c1	:1,
				c2	:1,
				tos	:3,
				c3	:1,
				busy	:1;
} fp_status_t;

/*
 * Control word.
 */

typedef struct fp_control {
    unsigned short		invalid	:1,
    				denorm	:1,
				zdiv	:1,
				ovrfl	:1,
				undfl	:1,
				precis	:1,
					:2,
				pc	:2,
#define FP_PREC_24B		0
#define	FP_PREC_53B		2
#define FP_PREC_64B		3
				rc	:2,
#define FP_RND_NEAR		0
#define FP_RND_DOWN		1
#define FP_RND_UP		2
#define FP_CHOP			3
				/*inf*/	:1,
					:3;
} fp_control_t;

#include <architecture/i386/sel.h>

/*
 * Floating point 'environment'
 * used by FSTENV/FLDENV instructions.
 */

typedef struct fp_env {
    fp_control_t		control;
    unsigned short			:16;
    fp_status_t			status;
    unsigned short			:16;
    fp_tag_t			tag;
    unsigned short			:16;
    unsigned int		ip;
    sel_t			cs;
    unsigned short		opcode;
    unsigned int		dp;
    sel_t			ds;
    unsigned short			:16;
} fp_env_t;

/*
 * Floating point state
 * used by FSAVE/FRSTOR instructions.
 */
 
typedef struct fp_state {
    fp_env_t			environ;
    fp_stack_t			stack;
} fp_state_t;
Commit	Line	Data
21362eb3 A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* Copyright (c) 1992 NeXT Computer, Inc.
	30	*
	31	* Intel386 Family: Floating Point unit.
	32	*
	33	* HISTORY
	34	*
	35	* 5 October 1992 ? at NeXT
	36	* Added names to previously unamed fields in the mantissa.
	37	*
	38	* 5 April 1992 ? at NeXT
	39	* Created.
	40	*/
	41
	42	/*
	43	* Data register.
	44	*/
	45
	46	typedef struct fp_data_reg {
	47	unsigned short mant;
	48	unsigned short mant1 :16,
	49	mant2 :16,
	50	mant3 :16;
	51	unsigned short exp :15,
	52	sign :1;
	53	} fp_data_reg_t;
	54
	55	/*
	56	* Data register stack.
	57	*/
	58
	59	typedef struct fp_stack {
	60	fp_data_reg_t ST[8];
	61	} fp_stack_t;
	62
	63	/*
	64	* Register stack tag word.
65	*/
66
67	typedef struct fp_tag {
68	unsigned short tag0 :2,
69	tag1 :2,
70	tag2 :2,
71	tag3 :2,
72	tag4 :2,
73	tag5 :2,
74	tag6 :2,
75	tag7 :2;
76	#define FP_TAG_VALID 0
77	#define FP_TAG_ZERO 1
78	#define FP_TAG_SPEC 2
79	#define FP_TAG_EMPTY 3
80	} fp_tag_t;
81
82	/*
83	* Status word.
84	*/
85
86	typedef struct fp_status {
87	unsigned short invalid :1,
88	denorm :1,
89	zdiv :1,
90	ovrfl :1,
91	undfl :1,
92	precis :1,
93	stkflt :1,
94	errsumm :1,
95	c0 :1,
96	c1 :1,
97	c2 :1,
98	tos :3,
99	c3 :1,
100	busy :1;
101	} fp_status_t;
102
103	/*
104	* Control word.
105	*/
106
107	typedef struct fp_control {
108	unsigned short invalid :1,
109	denorm :1,
110	zdiv :1,
111	ovrfl :1,
112	undfl :1,
113	precis :1,
114	:2,
115	pc :2,
116	#define FP_PREC_24B 0
117	#define FP_PREC_53B 2
118	#define FP_PREC_64B 3
119	rc :2,
120	#define FP_RND_NEAR 0
121	#define FP_RND_DOWN 1
122	#define FP_RND_UP 2
123	#define FP_CHOP 3
124	/inf/ :1,
125	:3;
126	} fp_control_t;
127
128	#include <architecture/i386/sel.h>
129
130	/*
131	* Floating point 'environment'
132	* used by FSTENV/FLDENV instructions.
133	*/
134
135	typedef struct fp_env {
136	fp_control_t control;
137	unsigned short :16;
138	fp_status_t status;
139	unsigned short :16;
140	fp_tag_t tag;
141	unsigned short :16;
142	unsigned int ip;
143	sel_t cs;
144	unsigned short opcode;
145	unsigned int dp;
146	sel_t ds;
147	unsigned short :16;
148	} fp_env_t;
149
150	/*
151	* Floating point state
152	* used by FSAVE/FRSTOR instructions.
153	*/
154
155	typedef struct fp_state {
156	fp_env_t environ;
157	fp_stack_t stack;
158	} fp_state_t;