osfmk/mach/i386/fp_reg.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,
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  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) 1992-1989 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 #ifndef _I386_FP_SAVE_H_
  60 #define _I386_FP_SAVE_H_
  61
  62
  63 /* note when allocating this data structure, it must be 16 byte aligned. */
  64 struct x86_fx_save {
  65         unsigned short  fx_control;     /* control */
  66         unsigned short  fx_status;      /* status */
  67         unsigned char   fx_tag;         /* register tags */
  68         unsigned char   fx_bbz1;        /* better be zero when calling fxrtstor */
  69         unsigned short  fx_opcode;
  70         unsigned int    fx_eip;         /* eip  instruction */
  71         unsigned short  fx_cs;          /* cs instruction */
  72         unsigned short  fx_bbz2;        /* better be zero when calling fxrtstor */
  73         unsigned int    fx_dp;          /* data address */
  74         unsigned short  fx_ds;          /* data segment */
  75         unsigned short  fx_bbz3;        /* better be zero when calling fxrtstor */
  76         unsigned int    fx_MXCSR;
  77         unsigned int    fx_MXCSR_MASK;
  78         unsigned short  fx_reg_word[8][8];      /* STx/MMx registers */
  79         unsigned short  fx_XMM_reg[8][16];      /* XMM0-XMM15 on 64 bit processors */
  80                                                 /* XMM0-XMM7  on 32 bit processors... unused storage reserved */
  81         unsigned char   fx_reserved[16*6];      /* reserved by intel for future expansion */
  82 };
  83
  84
  85 /*
  86  * Control register
  87  */
  88 #define FPC_IE          0x0001          /* enable invalid operation
  89                                            exception */
  90 #define FPC_IM          FPC_IE
  91 #define FPC_DE          0x0002          /* enable denormalized operation
  92                                            exception */
  93 #define FPC_DM          FPC_DE
  94 #define FPC_ZE          0x0004          /* enable zero-divide exception */
  95 #define FPC_ZM          FPC_ZE
  96 #define FPC_OE          0x0008          /* enable overflow exception */
  97 #define FPC_OM          FPC_OE
  98 #define FPC_UE          0x0010          /* enable underflow exception */
  99 #define FPC_PE          0x0020          /* enable precision exception */
 100 #define FPC_PC          0x0300          /* precision control: */
 101 #define FPC_PC_24       0x0000                  /* 24 bits */
 102 #define FPC_PC_53       0x0200                  /* 53 bits */
 103 #define FPC_PC_64       0x0300                  /* 64 bits */
 104 #define FPC_RC          0x0c00          /* rounding control: */
 105 #define FPC_RC_RN       0x0000                  /* round to nearest or even */
 106 #define FPC_RC_RD       0x0400                  /* round down */
 107 #define FPC_RC_RU       0x0800                  /* round up */
 108 #define FPC_RC_CHOP     0x0c00                  /* chop */
 109 #define FPC_IC          0x1000          /* infinity control (obsolete) */
 110 #define FPC_IC_PROJ     0x0000                  /* projective infinity */
 111 #define FPC_IC_AFF      0x1000                  /* affine infinity (std) */
 112
 113 /*
 114  * Status register
 115  */
 116 #define FPS_IE          0x0001          /* invalid operation */
 117 #define FPS_DE          0x0002          /* denormalized operand */
 118 #define FPS_ZE          0x0004          /* divide by zero */
 119 #define FPS_OE          0x0008          /* overflow */
 120 #define FPS_UE          0x0010          /* underflow */
 121 #define FPS_PE          0x0020          /* precision */
 122 #define FPS_SF          0x0040          /* stack flag */
 123 #define FPS_ES          0x0080          /* error summary */
 124 #define FPS_C0          0x0100          /* condition code bit 0 */
 125 #define FPS_C1          0x0200          /* condition code bit 1 */
 126 #define FPS_C2          0x0400          /* condition code bit 2 */
 127 #define FPS_TOS         0x3800          /* top-of-stack pointer */
 128 #define FPS_TOS_SHIFT   11
 129 #define FPS_C3          0x4000          /* condition code bit 3 */
 130 #define FPS_BUSY        0x8000          /* FPU busy */
 131
 132 /*
 133  * Kind of floating-point support provided by kernel.
 134  */
 135 #define FP_NO           0               /* no floating point */
 136 #define FP_SOFT         1               /* software FP emulator */
 137 #define FP_287          2               /* 80287 */
 138 #define FP_387          3               /* 80387 or 80486 */
 139 #define FP_FXSR         4               /* Fast save/restore SIMD Extension */
 140
 141 #endif  /* _I386_FP_SAVE_H_ */