FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/fpu.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    /* 
     * Mach Operating System
     * Copyright (c) 1991 Carnegie Mellon University
     * All Rights Reserved.
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon 
     * the rights to redistribute these changes.
     */
    
    /*
     */
    
    #ifndef _I386_FPU_H_
    #define _I386_FPU_H_
    
    /*
     * Macro definitions for routines to manipulate the
     * floating-point processor.
     */
    
    #include <cpus.h>
    #include <i386/proc_reg.h>
    #include <i386/thread.h>
    #include <kern/kern_types.h>
    #include <mach/i386/kern_return.h>
    #include <mach/i386/thread_status.h>
    
    /*
     * FPU instructions.
     */
    #define fninit() \
            __asm__ volatile("fninit")
    
    #define fnstcw(control) \
            __asm__("fnstcw %0" : "=m" (*(unsigned short *)(control)))
    
    #define fldcw(control) \
            __asm__ volatile("fldcw %0" : : "m" (*(unsigned short *) &(control)) )
    
    extern unsigned short           fnstsw(void);
    
    extern __inline__ unsigned short fnstsw(void)
    {
            unsigned short status;
            __asm__ volatile("fnstsw %0" : "=ma" (status));
            return(status);
    }
    
    #define fnclex() \
            __asm__ volatile("fnclex")
    
    #define fnsave(state)  \
            __asm__ volatile("fnsave %0" : "=m" (*state))
    
    #define frstor(state) \
           __asm__ volatile("frstor %0" : : "m" (state))
   
   #define fwait() \
           __asm__("fwait");
   
   #define fxrstor(addr)           __asm("fxrstor %0" : : "m" (*(addr)))     
   #define fxsave(addr)            __asm __volatile("fxsave %0" : "=m" (*(addr)))
   
   #define FXSAFE() (fp_kind == FP_FXSR)
   
   #define fpu_load_context(pcb)
   
   /*
    * Save thread`s FPU context.
    * If only one CPU, we just set the task-switched bit,
    * to keep the new thread from using the coprocessor.
    * If multiple CPUs, we save the entire state.
    * NOTE: in order to provide backwards compatible support in the kernel. When saving SSE2 state, we also save the
    * FP state in it's old location. Otherwise fpu_get_state() and fpu_set_state() will stop working
    */
   #if     NCPUS > 1
   #define fpu_save_context(thread) \
       { \
           register struct i386_fpsave_state *ifps; \
           ifps = (thread)->top_act->mact.pcb->ims.ifps; \
           if (ifps != 0 && !ifps->fp_valid) { \
               /* registers are in FPU - save to memory */ \
               ifps->fp_valid = TRUE; \
               ifps->fp_save_flavor = FP_387; \
               if (FXSAFE()) { \
                   fxsave(&ifps->fx_save_state); \
                   ifps->fp_save_flavor = FP_FXSR; \
               } \
               fnsave(&ifps->fp_save_state); \
           } \
           set_ts(); \
       }
               
   #else   /* NCPUS == 1 */
   #define fpu_save_context(thread) \
       { \
               set_ts(); \
       }
   
   #endif  /* NCPUS == 1 */
   
   
   extern int      fp_kind;
   
   extern void             init_fpu(void);
   extern void             fpu_module_init(void);
   extern void             fp_free(
                                   struct i386_fpsave_state        * fps);
   extern kern_return_t    fpu_set_state(
                                   thread_act_t                    thr_act,
                                   struct i386_float_state         * st);
   extern kern_return_t    fpu_get_state(
                                   thread_act_t                    thr_act,
                                   struct i386_float_state         * st);
   /* extern kern_return_t fpu_set_fxstate(
                                   thread_act_t                    thr_act,
                                   struct i386_float_state         * st);
   extern kern_return_t    fpu_get_fxstate(
                                   thread_act_t                    thr_act,
                                   struct i386_float_state         * st); */
   extern void             fpnoextflt(void);
   extern void             fpextovrflt(void);
   extern void             fpexterrflt(void);
   extern void             fp_state_alloc(void);
   extern void             fpintr(void);
   extern void             fpflush(thread_act_t);
   
   #endif  /* _I386_FPU_H_ */

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