osfmk/i386/fpu.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   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
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  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.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53
  54 /*
  55  */
  56
  57 #ifndef _I386_FPU_H_
  58 #define _I386_FPU_H_
  59
  60 /*
  61  * Macro definitions for routines to manipulate the
  62  * floating-point processor.
  63  */
  64
  65 #include <cpus.h>
  66 #include <i386/proc_reg.h>
  67 #include <i386/thread.h>
  68 #include <kern/kern_types.h>
  69 #include <mach/i386/kern_return.h>
  70 #include <mach/i386/thread_status.h>
  71
  72 /*
  73  * FPU instructions.
  74  */
  75 #define fninit() \
  76         __asm__ volatile("fninit")
  77
  78 #define fnstcw(control) \
  79         __asm__("fnstcw %0" : "=m" (*(unsigned short *)(control)))
  80
  81 #define fldcw(control) \
  82         __asm__ volatile("fldcw %0" : : "m" (*(unsigned short *) &(control)) )
  83
  84 extern unsigned short           fnstsw(void);
  85
  86 extern __inline__ unsigned short fnstsw(void)
  87 {
  88         unsigned short status;
  89         __asm__ volatile("fnstsw %0" : "=ma" (status));
  90         return(status);
  91 }
  92
  93 #define fnclex() \
  94         __asm__ volatile("fnclex")
  95
  96 #define fnsave(state) \
  97         __asm__ volatile("fnsave %0" : "=m" (*state))
  98
  99 #define frstor(state) \
 100         __asm__ volatile("frstor %0" : : "m" (state))
 101
 102 #define fwait() \
 103         __asm__("fwait");
 104
 105
 106 #define fpu_load_context(pcb)
 107
 108 /*
 109  * Save thread`s FPU context.
 110  * If only one CPU, we just set the task-switched bit,
 111  * to keep the new thread from using the coprocessor.
 112  * If multiple CPUs, we save the entire state.
 113  */
 114 #if     NCPUS > 1
 115 #define fpu_save_context(thread) \
 116     { \
 117         register struct i386_fpsave_state *ifps; \
 118         ifps = (thread)->top_act->mact.pcb->ims.ifps; \
 119         if (ifps != 0 && !ifps->fp_valid) { \
 120             /* registers are in FPU - save to memory */ \
 121             ifps->fp_valid = TRUE; \
 122             fnsave(&ifps->fp_save_state); \
 123         } \
 124         set_ts(); \
 125     }
 126
 127 #else   /* NCPUS == 1 */
 128 #define fpu_save_context(thread) \
 129     { \
 130             set_ts(); \
 131     }
 132
 133 #endif  /* NCPUS == 1 */
 134
 135
 136 extern int      fp_kind;
 137
 138 extern void             init_fpu(void);
 139 extern void             fpu_module_init(void);
 140 extern void             fp_free(
 141                                 struct i386_fpsave_state        * fps);
 142 extern kern_return_t    fpu_set_state(
 143                                 thread_act_t                    thr_act,
 144                                 struct i386_float_state         * st);
 145 extern kern_return_t    fpu_get_state(
 146                                 thread_act_t                    thr_act,
 147                                 struct i386_float_state         * st);
 148 extern void             fpnoextflt(void);
 149 extern void             fpextovrflt(void);
 150 extern void             fpexterrflt(void);
 151 extern void             fp_state_alloc(void);
 152 extern void             fpintr(void);
 153 extern void             fpflush(thread_act_t);
 154
 155 #endif  /* _I386_FPU_H_ */