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