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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*
	26	* Copyright (c) 1992 NeXT Computer, Inc.
	27	*
	28	* Intel386 Family: Floating Point unit.
	29	*
	30	* HISTORY
	31	*
	32	* 5 October 1992 ? at NeXT
	33	* Added names to previously unamed fields in the mantissa.
	34	*
	35	* 5 April 1992 ? at NeXT
	36	* Created.
	37	*/
	38
	39	/*
	40	* Data register.
	41	*/
	42
	43	typedef struct fp_data_reg {
	44	unsigned short mant;
	45	unsigned short mant1 :16,
	46	mant2 :16,
	47	mant3 :16;
	48	unsigned short exp :15,
	49	sign :1;
	50	} fp_data_reg_t;
	51
	52	/*
	53	* Data register stack.
	54	*/
	55
	56	typedef struct fp_stack {
	57	fp_data_reg_t ST[8];
	58	} fp_stack_t;
	59
	60	/*
	61	* Register stack tag word.
	62	*/
	63
	64	typedef struct fp_tag {
	65	unsigned short tag0 :2,
	66	tag1 :2,
	67	tag2 :2,
	68	tag3 :2,
	69	tag4 :2,
	70	tag5 :2,
	71	tag6 :2,
	72	tag7 :2;
	73	#define FP_TAG_VALID 0
	74	#define FP_TAG_ZERO 1
	75	#define FP_TAG_SPEC 2
	76	#define FP_TAG_EMPTY 3
	77	} fp_tag_t;
	78
	79	/*
	80	* Status word.
	81	*/
	82
	83	typedef struct fp_status {
	84	unsigned short invalid :1,
	85	denorm :1,
86	zdiv :1,
87	ovrfl :1,
88	undfl :1,
89	precis :1,
90	stkflt :1,
91	errsumm :1,
92	c0 :1,
93	c1 :1,
94	c2 :1,
95	tos :3,
96	c3 :1,
97	busy :1;
98	} fp_status_t;
99
100	/*
101	* Control word.
102	*/
103
104	typedef struct fp_control {
105	unsigned short invalid :1,
106	denorm :1,
107	zdiv :1,
108	ovrfl :1,
109	undfl :1,
110	precis :1,
111	:2,
112	pc :2,
113	#define FP_PREC_24B 0
114	#define FP_PREC_53B 2
115	#define FP_PREC_64B 3
116	rc :2,
117	#define FP_RND_NEAR 0
118	#define FP_RND_DOWN 1
119	#define FP_RND_UP 2
120	#define FP_CHOP 3
121	/inf/ :1,
122	:3;
123	} fp_control_t;
124
125	#include <architecture/i386/sel.h>
126
127	/*
128	* Floating point 'environment'
129	* used by FSTENV/FLDENV instructions.
130	*/
131
132	typedef struct fp_env {
133	fp_control_t control;
134	unsigned short :16;
135	fp_status_t status;
136	unsigned short :16;
137	fp_tag_t tag;
138	unsigned short :16;
139	unsigned int ip;
140	sel_t cs;
141	unsigned short opcode;
142	unsigned int dp;
143	sel_t ds;
144	unsigned short :16;
145	} fp_env_t;
146
147	/*
148	* Floating point state
149	* used by FSAVE/FRSTOR instructions.
150	*/
151
152	typedef struct fp_state {
153	fp_env_t environ;
154	fp_stack_t stack;
155	} fp_state_t;