The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/npx.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)npx.h 5.3 (Berkeley) 1/18/91
   33  * $FreeBSD: releng/9.2/sys/i386/include/npx.h 239995 2012-09-01 15:57:12Z kib $
   34  */
   35 
   36 /*
   37  * 287/387 NPX Coprocessor Data Structures and Constants
   38  * W. Jolitz 1/90
   39  */
   40 
   41 #ifndef _MACHINE_NPX_H_
   42 #define _MACHINE_NPX_H_
   43 
   44 /* Environment information of floating point unit */
   45 struct env87 {
   46         long    en_cw;          /* control word (16bits) */
   47         long    en_sw;          /* status word (16bits) */
   48         long    en_tw;          /* tag word (16bits) */
   49         long    en_fip;         /* floating point instruction pointer */
   50         u_short en_fcs;         /* floating code segment selector */
   51         u_short en_opcode;      /* opcode last executed (11 bits ) */
   52         long    en_foo;         /* floating operand offset */
   53         long    en_fos;         /* floating operand segment selector */
   54 };
   55 
   56 /* Contents of each floating point accumulator */
   57 struct fpacc87 {
   58 #ifdef dontdef /* too unportable */
   59         u_long  fp_mantlo;      /* mantissa low (31:0) */
   60         u_long  fp_manthi;      /* mantissa high (63:32) */
   61         int     fp_exp:15;      /* exponent */
   62         int     fp_sgn:1;       /* mantissa sign */
   63 #else
   64         u_char  fp_bytes[10];
   65 #endif
   66 };
   67 
   68 /* Floating point context */
   69 struct save87 {
   70         struct  env87 sv_env;   /* floating point control/status */
   71         struct  fpacc87 sv_ac[8];       /* accumulator contents, 0-7 */
   72         u_char  sv_pad0[4];     /* padding for (now unused) saved status word */
   73         /*
   74          * Bogus padding for emulators.  Emulators should use their own
   75          * struct and arrange to store into this struct (ending here)
   76          * before it is inspected for ptracing or for core dumps.  Some
   77          * emulators overwrite the whole struct.  We have no good way of
   78          * knowing how much padding to leave.  Leave just enough for the
   79          * GPL emulator's i387_union (176 bytes total).
   80          */
   81         u_char  sv_pad[64];     /* padding; used by emulators */
   82 };
   83 
   84 struct  envxmm {
   85         u_int16_t       en_cw;          /* control word (16bits) */
   86         u_int16_t       en_sw;          /* status word (16bits) */
   87         u_int16_t       en_tw;          /* tag word (16bits) */
   88         u_int16_t       en_opcode;      /* opcode last executed (11 bits ) */
   89         u_int32_t       en_fip;         /* floating point instruction pointer */
   90         u_int16_t       en_fcs;         /* floating code segment selector */
   91         u_int16_t       en_pad0;        /* padding */
   92         u_int32_t       en_foo;         /* floating operand offset */
   93         u_int16_t       en_fos;         /* floating operand segment selector */
   94         u_int16_t       en_pad1;        /* padding */
   95         u_int32_t       en_mxcsr;       /* SSE control/status register */
   96         u_int32_t       en_mxcsr_mask;  /* valid bits in mxcsr */
   97 };
   98 
   99 /* Contents of each SSE extended accumulator */
  100 struct  xmmacc {
  101         u_char  xmm_bytes[16];
  102 };
  103 
  104 /* Contents of the upper 16 bytes of each AVX extended accumulator */
  105 struct  ymmacc {
  106         uint8_t  ymm_bytes[16];
  107 };
  108 
  109 struct  savexmm {
  110         struct  envxmm  sv_env;
  111         struct {
  112                 struct fpacc87  fp_acc;
  113                 u_char          fp_pad[6];      /* padding */
  114         } sv_fp[8];
  115         struct xmmacc   sv_xmm[8];
  116         u_char sv_pad[224];
  117 } __aligned(16);
  118 
  119 union   savefpu {
  120         struct  save87  sv_87;
  121         struct  savexmm sv_xmm;
  122 };
  123 
  124 struct xstate_hdr {
  125         uint64_t xstate_bv;
  126         uint8_t xstate_rsrv0[16];
  127         uint8_t xstate_rsrv[40];
  128 };
  129 
  130 struct savexmm_xstate {
  131         struct xstate_hdr sx_hd;
  132         struct ymmacc   sx_ymm[16];
  133 };
  134 
  135 struct savexmm_ymm {
  136         struct  envxmm  sv_env;
  137         struct {
  138                 struct fpacc87  fp_acc;
  139                 int8_t          fp_pad[6];      /* padding */
  140         } sv_fp[8];
  141         struct xmmacc   sv_xmm[16];
  142         uint8_t sv_pad[96];
  143         struct savexmm_xstate sv_xstate;
  144 } __aligned(64);
  145 
  146 /*
  147  * The hardware default control word for i387's and later coprocessors is
  148  * 0x37F, giving:
  149  *
  150  *      round to nearest
  151  *      64-bit precision
  152  *      all exceptions masked.
  153  *
  154  * We modify the affine mode bit and precision bits in this to give:
  155  *
  156  *      affine mode for 287's (if they work at all) (1 in bitfield 1<<12)
  157  *      53-bit precision (2 in bitfield 3<<8)
  158  *
  159  * 64-bit precision often gives bad results with high level languages
  160  * because it makes the results of calculations depend on whether
  161  * intermediate values are stored in memory or in FPU registers.
  162  */
  163 #define __INITIAL_NPXCW__       0x127F
  164 #define __INITIAL_MXCSR__       0x1F80
  165 
  166 #ifdef _KERNEL
  167 
  168 #define PCB_USER_FPU(pcb) (((pcb)->pcb_flags & PCB_KERNNPX) == 0)
  169 
  170 int     npxdna(void);
  171 void    npxdrop(void);
  172 void    npxexit(struct thread *td);
  173 int     npxformat(void);
  174 int     npxgetregs(struct thread *td);
  175 void    npxinit(void);
  176 void    npxsave(union savefpu *addr);
  177 void    npxsetregs(struct thread *td, union savefpu *addr);
  178 int     npxtrap_x87(void);
  179 int     npxtrap_sse(void);
  180 void    npxuserinited(struct thread *);
  181 struct fpu_kern_ctx *fpu_kern_alloc_ctx(u_int flags);
  182 void    fpu_kern_free_ctx(struct fpu_kern_ctx *ctx);
  183 int     fpu_kern_enter(struct thread *td, struct fpu_kern_ctx *ctx,
  184             u_int flags);
  185 int     fpu_kern_leave(struct thread *td, struct fpu_kern_ctx *ctx);
  186 int     fpu_kern_thread(u_int flags);
  187 int     is_fpu_kern_thread(u_int flags);
  188 
  189 /*
  190  * Flags for fpu_kern_enter() and fpu_kern_thread().
  191  */
  192 #define FPU_KERN_NORMAL 0x0000
  193 #define FPU_KERN_NOWAIT 0x0001
  194 
  195 #endif
  196 
  197 #endif /* !_MACHINE_NPX_H_ */

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