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Annotation of kernel/machdep/i386/fp_inline.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  * Copyright (c) 1992 NeXT Computer, Inc.
                     27:  *
                     28:  * Intel386 Family:    Floating point maintenance support.
                     29:  *
                     30:  * HISTORY
                     31:  *
                     32:  * 7 April 1992 ? at NeXT
                     33:  *     Created.
                     34:  */
                     35: 
                     36: #import <architecture/i386/fpu.h>
                     37: 
                     38: /*
                     39:  * Reinitialize the floating
                     40:  * point unit.
                     41:  */
                     42: 
                     43: static inline
                     44: void
                     45: fninit(
                     46:     void
                     47: )
                     48: {
                     49:     asm volatile("
                     50:        fninit");
                     51: }
                     52: 
                     53: /*
                     54:  * Save the entire state of
                     55:  * the floating point unit.
                     56:  * The task switched flag
                     57:  * is cleared before the save
                     58:  * so that we are guaranteed
                     59:  * not to get an INT 7.  Also
                     60:  * wait until the state save is
                     61:  * completed before returning.
                     62:  */
                     63: 
                     64: static inline
                     65: void
                     66: fnsave(
                     67:     fp_state_t *       state
                     68: )
                     69: {
                     70:     asm volatile("
                     71:        clts;
                     72:        fnsave %0;
                     73:        fwait"
                     74:            :
                     75:            : "m" (*state));
                     76: }
                     77: 
                     78: /*
                     79:  * Restore the entire state of
                     80:  * the floating point unit.  The
                     81:  * task switched flags is cleared
                     82:  * before the restore so that we
                     83:  * are guaranteed not to get an
                     84:  * INT 7.
                     85:  */
                     86: 
                     87: static inline
                     88: void
                     89: frstor(
                     90:     fp_state_t *       state
                     91: )
                     92: {
                     93:     asm volatile("
                     94:        clts;
                     95:        frstor %0"
                     96:            :
                     97:            : "m" (*state));
                     98: }

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