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Annotation of XNU/osfmk/mach/i386/fp_reg.h, revision 1.1

1.1     ! root        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:  * HISTORY
        !            27:  * 
        !            28:  * Revision 1.1.1.1  1998/09/22 21:05:31  wsanchez
        !            29:  * Import of Mac OS X kernel (~semeria)
        !            30:  *
        !            31:  * Revision 1.1.1.1  1998/03/07 02:25:47  wsanchez
        !            32:  * Import of OSF Mach kernel (~mburg)
        !            33:  *
        !            34:  * Revision 1.2.6.1  1994/09/23  02:37:03  ezf
        !            35:  *     change marker to not FREE
        !            36:  *     [1994/09/22  21:39:57  ezf]
        !            37:  *
        !            38:  * Revision 1.2.2.2  1993/06/09  02:40:30  gm
        !            39:  *     Added to OSF/1 R1.3 from NMK15.0.
        !            40:  *     [1993/06/02  21:16:11  jeffc]
        !            41:  * 
        !            42:  * Revision 1.2  1993/04/19  16:33:51  devrcs
        !            43:  *     ansi C conformance changes
        !            44:  *     [1993/02/02  18:56:01  david]
        !            45:  * 
        !            46:  * Revision 1.1  1992/09/30  02:30:43  robert
        !            47:  *     Initial revision
        !            48:  * 
        !            49:  * $EndLog$
        !            50:  */
        !            51: /* CMU_HIST */
        !            52: /*
        !            53:  * Revision 2.1.1.1.2.1  92/03/03  16:21:23  jeffreyh
        !            54:  *     Merged up to Trunk
        !            55:  *     [92/02/26            jeffreyh]
        !            56:  * 
        !            57:  * Revision 2.4  92/02/26  13:10:29  elf
        !            58:  *     Added stupid alaises to make i386/fpu.c compile. RVB will fix.
        !            59:  *      
        !            60:  *     [92/02/26            elf]
        !            61:  * 
        !            62:  * Revision 2.3  92/02/26  12:47:46  elf
        !            63:  *     Installed from i386 directory.
        !            64:  *     [92/02/26            danner]
        !            65:  * 
        !            66:  * 
        !            67:  * Revision 2.2  92/01/03  20:19:47  dbg
        !            68:  *     Move this file to mach/i386.  Add FP_NO..FP_387 codes for
        !            69:  *     floating-point processor status.  Error bits in control
        !            70:  *     register are masks, not enables.
        !            71:  *     [91/10/19            dbg]
        !            72:  * 
        !            73:  */
        !            74: /* CMU_ENDHIST */
        !            75: /* 
        !            76:  * Mach Operating System
        !            77:  * Copyright (c) 1992-1989 Carnegie Mellon University
        !            78:  * All Rights Reserved.
        !            79:  * 
        !            80:  * Permission to use, copy, modify and distribute this software and its
        !            81:  * documentation is hereby granted, provided that both the copyright
        !            82:  * notice and this permission notice appear in all copies of the
        !            83:  * software, derivative works or modified versions, and any portions
        !            84:  * thereof, and that both notices appear in supporting documentation.
        !            85:  * 
        !            86:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            87:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            88:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            89:  * 
        !            90:  * Carnegie Mellon requests users of this software to return to
        !            91:  * 
        !            92:  *  Software Distribution Coordinator  or  [email protected]
        !            93:  *  School of Computer Science
        !            94:  *  Carnegie Mellon University
        !            95:  *  Pittsburgh PA 15213-3890
        !            96:  * 
        !            97:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            98:  * the rights to redistribute these changes.
        !            99:  */
        !           100: /*
        !           101:  */
        !           102: 
        !           103: #ifndef        _I386_FP_SAVE_H_
        !           104: #define        _I386_FP_SAVE_H_
        !           105: /*
        !           106:  *     Floating point registers and status, as saved
        !           107:  *     and restored by FP save/restore instructions.
        !           108:  */
        !           109: struct i386_fp_save    {
        !           110:        unsigned short  fp_control;     /* control */
        !           111:        unsigned short  fp_unused_1;
        !           112:        unsigned short  fp_status;      /* status */
        !           113:        unsigned short  fp_unused_2;
        !           114:        unsigned short  fp_tag;         /* register tags */
        !           115:        unsigned short  fp_unused_3;
        !           116:        unsigned int    fp_eip;         /* eip at failed instruction */
        !           117:        unsigned short  fp_cs;          /* cs at failed instruction */
        !           118:        unsigned short  fp_opcode;      /* opcode of failed instruction */
        !           119:        unsigned int    fp_dp;          /* data address */
        !           120:        unsigned short  fp_ds;          /* data segment */
        !           121:        unsigned short  fp_unused_4;
        !           122: };
        !           123: 
        !           124: struct i386_fp_regs {
        !           125:        unsigned short  fp_reg_word[5][8];
        !           126:                                        /* space for 8 80-bit FP registers */
        !           127: };
        !           128: 
        !           129: /*
        !           130:  * Control register
        !           131:  */
        !           132: #define        FPC_IE          0x0001          /* enable invalid operation
        !           133:                                           exception */
        !           134: #define FPC_IM         FPC_IE
        !           135: #define        FPC_DE          0x0002          /* enable denormalized operation
        !           136:                                           exception */
        !           137: #define FPC_DM         FPC_DE
        !           138: #define        FPC_ZE          0x0004          /* enable zero-divide exception */
        !           139: #define FPC_ZM         FPC_ZE
        !           140: #define        FPC_OE          0x0008          /* enable overflow exception */
        !           141: #define FPC_OM         FPC_OE
        !           142: #define        FPC_UE          0x0010          /* enable underflow exception */
        !           143: #define        FPC_PE          0x0020          /* enable precision exception */
        !           144: #define        FPC_PC          0x0300          /* precision control: */
        !           145: #define        FPC_PC_24       0x0000                  /* 24 bits */
        !           146: #define        FPC_PC_53       0x0200                  /* 53 bits */
        !           147: #define        FPC_PC_64       0x0300                  /* 64 bits */
        !           148: #define        FPC_RC          0x0c00          /* rounding control: */
        !           149: #define        FPC_RC_RN       0x0000                  /* round to nearest or even */
        !           150: #define        FPC_RC_RD       0x0400                  /* round down */
        !           151: #define        FPC_RC_RU       0x0800                  /* round up */
        !           152: #define        FPC_RC_CHOP     0x0c00                  /* chop */
        !           153: #define        FPC_IC          0x1000          /* infinity control (obsolete) */
        !           154: #define        FPC_IC_PROJ     0x0000                  /* projective infinity */
        !           155: #define        FPC_IC_AFF      0x1000                  /* affine infinity (std) */
        !           156: 
        !           157: /*
        !           158:  * Status register
        !           159:  */
        !           160: #define        FPS_IE          0x0001          /* invalid operation */
        !           161: #define        FPS_DE          0x0002          /* denormalized operand */
        !           162: #define        FPS_ZE          0x0004          /* divide by zero */
        !           163: #define        FPS_OE          0x0008          /* overflow */
        !           164: #define        FPS_UE          0x0010          /* underflow */
        !           165: #define        FPS_PE          0x0020          /* precision */
        !           166: #define        FPS_SF          0x0040          /* stack flag */
        !           167: #define        FPS_ES          0x0080          /* error summary */
        !           168: #define        FPS_C0          0x0100          /* condition code bit 0 */
        !           169: #define        FPS_C1          0x0200          /* condition code bit 1 */
        !           170: #define        FPS_C2          0x0400          /* condition code bit 2 */
        !           171: #define        FPS_TOS         0x3800          /* top-of-stack pointer */
        !           172: #define        FPS_TOS_SHIFT   11
        !           173: #define        FPS_C3          0x4000          /* condition code bit 3 */
        !           174: #define        FPS_BUSY        0x8000          /* FPU busy */
        !           175: 
        !           176: /*
        !           177:  * Kind of floating-point support provided by kernel.
        !           178:  */
        !           179: #define        FP_NO           0               /* no floating point */
        !           180: #define        FP_SOFT         1               /* software FP emulator */
        !           181: #define        FP_287          2               /* 80287 */
        !           182: #define        FP_387          3               /* 80387 or 80486 */
        !           183: 
        !           184: #endif /* _I386_FP_SAVE_H_ */

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