osfmk/i386/fpu.h

   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  Software.Distribution@CS.CMU.EDU
  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_ */