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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 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	*
e5568f75 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
e5568f75 A	12	* This Original Code and all software distributed under the License are
e5568f75 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
e5568f75 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1992 NeXT Computer, Inc.
	24	*
	25	* Intel386 Family: Floating Point unit.
	26	*
	27	* HISTORY
	28	*
	29	* 5 October 1992 ? at NeXT
	30	* Added names to previously unamed fields in the mantissa.
	31	*
	32	* 5 April 1992 ? at NeXT
	33	* Created.
	34	*/
	35
	36	/*
	37	* Data register.
	38	*/
	39
	40	typedef struct fp_data_reg {
	41	unsigned short mant;
	42	unsigned short mant1 :16,
	43	mant2 :16,
	44	mant3 :16;
	45	unsigned short exp :15,
	46	sign :1;
	47	} fp_data_reg_t;
	48
	49	/*
	50	* Data register stack.
	51	*/
	52
	53	typedef struct fp_stack {
	54	fp_data_reg_t ST[8];
	55	} fp_stack_t;
	56
	57	/*
	58	* Register stack tag word.
	59	*/
	60
	61	typedef struct fp_tag {
	62	unsigned short tag0 :2,
	63	tag1 :2,
	64	tag2 :2,
	65	tag3 :2,
	66	tag4 :2,
	67	tag5 :2,
	68	tag6 :2,
	69	tag7 :2;
	70	#define FP_TAG_VALID 0
	71	#define FP_TAG_ZERO 1
	72	#define FP_TAG_SPEC 2
	73	#define FP_TAG_EMPTY 3
	74	} fp_tag_t;
	75
	76	/*
	77	* Status word.
	78	*/
	79
	80	typedef struct fp_status {
	81	unsigned short invalid :1,
	82	denorm :1,
83	zdiv :1,
84	ovrfl :1,
85	undfl :1,
86	precis :1,
87	stkflt :1,
88	errsumm :1,
89	c0 :1,
90	c1 :1,
91	c2 :1,
92	tos :3,
93	c3 :1,
94	busy :1;
95	} fp_status_t;
96
97	/*
98	* Control word.
99	*/
100
101	typedef struct fp_control {
102	unsigned short invalid :1,
103	denorm :1,
104	zdiv :1,
105	ovrfl :1,
106	undfl :1,
107	precis :1,
108	:2,
109	pc :2,
110	#define FP_PREC_24B 0
111	#define FP_PREC_53B 2
112	#define FP_PREC_64B 3
113	rc :2,
114	#define FP_RND_NEAR 0
115	#define FP_RND_DOWN 1
116	#define FP_RND_UP 2
117	#define FP_CHOP 3
118	/inf/ :1,
119	:3;
120	} fp_control_t;
121
122	#include <architecture/i386/sel.h>
123
124	/*
125	* Floating point 'environment'
126	* used by FSTENV/FLDENV instructions.
127	*/
128
129	typedef struct fp_env {
130	fp_control_t control;
131	unsigned short :16;
132	fp_status_t status;
133	unsigned short :16;
134	fp_tag_t tag;
135	unsigned short :16;
136	unsigned int ip;
137	sel_t cs;
138	unsigned short opcode;
139	unsigned int dp;
140	sel_t ds;
141	unsigned short :16;
142	} fp_env_t;
143
144	/*
145	* Floating point state
146	* used by FSAVE/FRSTOR instructions.
147	*/
148
149	typedef struct fp_state {
150	fp_env_t environ;
151	fp_stack_t stack;
152	} fp_state_t;