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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
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.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * @OSF_COPYRIGHT@
24: */
25: /*
26: * Mach Operating System
27: * Copyright (c) 1991 Carnegie Mellon University
28: * All Rights Reserved.
29: *
30: * Permission to use, copy, modify and distribute this software and its
31: * documentation is hereby granted, provided that both the copyright
32: * notice and this permission notice appear in all copies of the
33: * software, derivative works or modified versions, and any portions
34: * thereof, and that both notices appear in supporting documentation.
35: *
36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39: *
40: * Carnegie Mellon requests users of this software to return to
41: *
42: * Software Distribution Coordinator or [email protected]
43: * School of Computer Science
44: * Carnegie Mellon University
45: * Pittsburgh PA 15213-3890
46: *
47: * any improvements or extensions that they make and grant Carnegie Mellon
48: * the rights to redistribute these changes.
49: */
50:
51: /*
52: */
53:
54: #ifndef _I386_FPU_H_
55: #define _I386_FPU_H_
56:
57: /*
58: * Macro definitions for routines to manipulate the
59: * floating-point processor.
60: */
61:
62: #include <cpus.h>
63: #include <i386/proc_reg.h>
64: #include <i386/thread.h>
65: #include <kern/kern_types.h>
66: #include <mach/i386/kern_return.h>
67: #include <mach/i386/thread_status.h>
68:
69: /*
70: * FPU instructions.
71: */
72: #define fninit() \
73: __asm__ volatile("fninit")
74:
75: #define fnstcw(control) \
76: __asm__("fnstcw %0" : "=m" (*(unsigned short *)(control)))
77:
78: #define fldcw(control) \
79: __asm__ volatile("fldcw %0" : : "m" (*(unsigned short *) &(control)) )
80:
81: extern unsigned short fnstsw(void);
82:
83: extern __inline__ unsigned short fnstsw(void)
84: {
85: unsigned short status;
86: __asm__ volatile("fnstsw %0" : "=ma" (status));
87: return(status);
88: }
89:
90: #define fnclex() \
91: __asm__ volatile("fnclex")
92:
93: #define fnsave(state) \
94: __asm__ volatile("fnsave %0" : "=m" (*state))
95:
96: #define frstor(state) \
97: __asm__ volatile("frstor %0" : : "m" (state))
98:
99: #define fwait() \
100: __asm__("fwait");
101:
102:
103: #define fpu_load_context(pcb)
104:
105: /*
106: * Save thread`s FPU context.
107: * If only one CPU, we just set the task-switched bit,
108: * to keep the new thread from using the coprocessor.
109: * If multiple CPUs, we save the entire state.
110: */
111: #if NCPUS > 1
112: #define fpu_save_context(thread) \
113: { \
114: register struct i386_fpsave_state *ifps; \
115: ifps = (thread)->top_act->mact.pcb->ims.ifps; \
116: if (ifps != 0 && !ifps->fp_valid) { \
117: /* registers are in FPU - save to memory */ \
118: ifps->fp_valid = TRUE; \
119: fnsave(&ifps->fp_save_state); \
120: } \
121: set_ts(); \
122: }
123:
124: #else /* NCPUS == 1 */
125: #define fpu_save_context(thread) \
126: { \
127: set_ts(); \
128: }
129:
130: #endif /* NCPUS == 1 */
131:
132:
133: extern int fp_kind;
134:
135: extern void init_fpu(void);
136: extern void fpu_module_init(void);
137: extern void fp_free(
138: struct i386_fpsave_state * fps);
139: extern kern_return_t fpu_set_state(
140: thread_act_t thr_act,
141: struct i386_float_state * st);
142: extern kern_return_t fpu_get_state(
143: thread_act_t thr_act,
144: struct i386_float_state * st);
145: extern void fpnoextflt(void);
146: extern void fpextovrflt(void);
147: extern void fpexterrflt(void);
148: extern void fp_state_alloc(void);
149: extern void fpintr(void);
150: extern void fpflush(thread_act_t);
151:
152: #endif /* _I386_FPU_H_ */
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