osfmk/i386/fpu.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56
  57 /*
  58  */
  59
  60 #ifndef _I386_FPU_H_
  61 #define _I386_FPU_H_
  62
  63 /*
  64  * Macro definitions for routines to manipulate the
  65  * floating-point processor.
  66  */
  67
  68 #include <i386/proc_reg.h>
  69 #include <i386/thread.h>
  70 #include <kern/kern_types.h>
  71 #include <mach/i386/kern_return.h>
  72 #include <mach/i386/thread_status.h>
  73
  74 /*
  75  * FPU instructions.
  76  */
  77 #define fninit() \
  78         __asm__ volatile("fninit")
  79
  80 #define fnstcw(control) \
  81         __asm__("fnstcw %0" : "=m" (*(unsigned short *)(control)))
  82
  83 #define fldcw(control) \
  84         __asm__ volatile("fldcw %0" : : "m" (*(unsigned short *) &(control)) )
  85
  86 extern unsigned short           fnstsw(void);
  87
  88 extern __inline__ unsigned short fnstsw(void)
  89 {
  90         unsigned short status;
  91         __asm__ volatile("fnstsw %0" : "=ma" (status));
  92         return(status);
  93 }
  94
  95 #define fnclex() \
  96         __asm__ volatile("fnclex")
  97
  98 #define fnsave(state)  \
  99         __asm__ volatile("fnsave %0" : "=m" (*state))
 100
 101 #define frstor(state) \
 102         __asm__ volatile("frstor %0" : : "m" (state))
 103
 104 #define fwait() \
 105         __asm__("fwait");
 106
 107 #define fxrstor(addr)           __asm("fxrstor %0" : : "m" (*(addr)))
 108 #define fxsave(addr)            __asm __volatile("fxsave %0" : "=m" (*(addr)))
 109
 110 #define FXSAFE() (fp_kind == FP_FXSR)
 111
 112 #define fpu_load_context(pcb)
 113
 114 /*
 115  * Save thread`s FPU context.
 116  * If only one CPU, we just set the task-switched bit,
 117  * to keep the new thread from using the coprocessor.
 118  * If multiple CPUs, we save the entire state.
 119  * NOTE: in order to provide backwards compatible support in the kernel. When saving SSE2 state, we also save the
 120  * FP state in it's old location. Otherwise fpu_get_state() and fpu_set_state() will stop working
 121  */
 122 #define fpu_save_context(thread) \
 123     { \
 124         register struct i386_fpsave_state *ifps; \
 125         ifps = (thread)->machine.pcb->ims.ifps; \
 126         if (ifps != 0 && !ifps->fp_valid) { \
 127             /* registers are in FPU - save to memory */ \
 128             ifps->fp_valid = TRUE; \
 129             ifps->fp_save_flavor = FP_387; \
 130             if (FXSAFE()) { \
 131                 fxsave(&ifps->fx_save_state); \
 132                 ifps->fp_save_flavor = FP_FXSR; \
 133             } \
 134             fnsave(&ifps->fp_save_state); \
 135         } \
 136         set_ts(); \
 137     }
 138
 139
 140
 141 extern int      fp_kind;
 142
 143 extern void             init_fpu(void);
 144 extern void             fpu_module_init(void);
 145 extern void             fpu_free(
 146                                 struct i386_fpsave_state        * fps);
 147 extern kern_return_t    fpu_set_state(
 148                                 thread_t                        thr_act,
 149                                 struct i386_float_state         * st);
 150 extern kern_return_t    fpu_get_state(
 151                                 thread_t                        thr_act,
 152                                 struct i386_float_state         * st);
 153 extern kern_return_t    fpu_set_fxstate(
 154                                 thread_t                        thr_act,
 155                                 struct i386_float_state         * st);
 156 extern kern_return_t    fpu_get_fxstate(
 157                                 thread_t                        thr_act,
 158                                 struct i386_float_state         * st);
 159 extern void             fpnoextflt(void);
 160 extern void             fpextovrflt(void);
 161 extern void             fpexterrflt(void);
 162 extern void             fp_state_alloc(void);
 163 extern void             fpintr(void);
 164 extern void             fpflush(thread_t);
 165
 166 #endif  /* _I386_FPU_H_ */