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/powerpc/powerpc/fpu.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (C) 1996 Wolfgang Solfrank.
    5  * Copyright (C) 1996 TooLs GmbH.
    6  * All rights reserved.
    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  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by TooLs GmbH.
   19  * 4. The name of TooLs GmbH may not be used to endorse or promote products
   20  *    derived from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
   23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32  *
   33  *      $NetBSD: fpu.c,v 1.5 2001/07/22 11:29:46 wiz Exp $
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD$");
   38 
   39 #include <sys/param.h>
   40 #include <sys/proc.h>
   41 #include <sys/systm.h>
   42 #include <sys/limits.h>
   43 
   44 #include <machine/fpu.h>
   45 #include <machine/pcb.h>
   46 #include <machine/psl.h>
   47 
   48 static void
   49 save_fpu_int(struct thread *td)
   50 {
   51         int     msr;
   52         struct  pcb *pcb;
   53 
   54         pcb = td->td_pcb;
   55 
   56         /*
   57          * Temporarily re-enable floating-point during the save
   58          */
   59         msr = mfmsr();
   60         if (pcb->pcb_flags & PCB_VSX)
   61                 mtmsr(msr | PSL_FP | PSL_VSX);
   62         else
   63                 mtmsr(msr | PSL_FP);
   64 
   65         /*
   66          * Save the floating-point registers and FPSCR to the PCB
   67          */
   68         if (pcb->pcb_flags & PCB_VSX) {
   69         #define SFP(n)   __asm ("stxvw4x " #n ", 0,%0" \
   70                         :: "b"(&pcb->pcb_fpu.fpr[n]));
   71                 SFP(0);         SFP(1);         SFP(2);         SFP(3);
   72                 SFP(4);         SFP(5);         SFP(6);         SFP(7);
   73                 SFP(8);         SFP(9);         SFP(10);        SFP(11);
   74                 SFP(12);        SFP(13);        SFP(14);        SFP(15);
   75                 SFP(16);        SFP(17);        SFP(18);        SFP(19);
   76                 SFP(20);        SFP(21);        SFP(22);        SFP(23);
   77                 SFP(24);        SFP(25);        SFP(26);        SFP(27);
   78                 SFP(28);        SFP(29);        SFP(30);        SFP(31);
   79         #undef SFP
   80         } else {
   81         #define SFP(n)   __asm ("stfd " #n ", 0(%0)" \
   82                         :: "b"(&pcb->pcb_fpu.fpr[n]));
   83                 SFP(0);         SFP(1);         SFP(2);         SFP(3);
   84                 SFP(4);         SFP(5);         SFP(6);         SFP(7);
   85                 SFP(8);         SFP(9);         SFP(10);        SFP(11);
   86                 SFP(12);        SFP(13);        SFP(14);        SFP(15);
   87                 SFP(16);        SFP(17);        SFP(18);        SFP(19);
   88                 SFP(20);        SFP(21);        SFP(22);        SFP(23);
   89                 SFP(24);        SFP(25);        SFP(26);        SFP(27);
   90                 SFP(28);        SFP(29);        SFP(30);        SFP(31);
   91         #undef SFP
   92         }
   93         __asm __volatile ("mffs 0; stfd 0,0(%0)" :: "b"(&pcb->pcb_fpu.fpscr));
   94 
   95         /*
   96          * Disable floating-point again
   97          */
   98         isync();
   99         mtmsr(msr);
  100 }
  101 
  102 void
  103 enable_fpu(struct thread *td)
  104 {
  105         int     msr;
  106         struct  pcb *pcb;
  107         struct  trapframe *tf;
  108 
  109         pcb = td->td_pcb;
  110         tf = trapframe(td);
  111 
  112         /*
  113          * Save the thread's FPU CPU number, and set the CPU's current
  114          * FPU thread
  115          */
  116         td->td_pcb->pcb_fpcpu = PCPU_GET(cpuid);
  117         PCPU_SET(fputhread, td);
  118 
  119         /*
  120          * Enable the FPU for when the thread returns from the exception.
  121          * If this is the first time the FPU has been used by the thread,
  122          * initialise the FPU registers and FPSCR to 0, and set the flag
  123          * to indicate that the FPU is in use.
  124          */
  125         pcb->pcb_flags |= PCB_FPU;
  126         if (pcb->pcb_flags & PCB_VSX)
  127                 tf->srr1 |= PSL_FP | PSL_VSX;
  128         else
  129                 tf->srr1 |= PSL_FP;
  130         if (!(pcb->pcb_flags & PCB_FPREGS)) {
  131                 memset(&pcb->pcb_fpu, 0, sizeof pcb->pcb_fpu);
  132                 pcb->pcb_flags |= PCB_FPREGS;
  133         }
  134 
  135         /*
  136          * Temporarily enable floating-point so the registers
  137          * can be restored.
  138          */
  139         msr = mfmsr();
  140         if (pcb->pcb_flags & PCB_VSX)
  141                 mtmsr(msr | PSL_FP | PSL_VSX);
  142         else
  143                 mtmsr(msr | PSL_FP);
  144 
  145         /*
  146          * Load the floating point registers and FPSCR from the PCB.
  147          * (A value of 0xff for mtfsf specifies that all 8 4-bit fields
  148          * of the saved FPSCR are to be loaded from the FPU reg).
  149          */
  150         __asm __volatile ("lfd 0,0(%0); mtfsf 0xff,0"
  151                           :: "b"(&pcb->pcb_fpu.fpscr));
  152 
  153         if (pcb->pcb_flags & PCB_VSX) {
  154         #define LFP(n)   __asm ("lxvw4x " #n ", 0,%0" \
  155                         :: "b"(&pcb->pcb_fpu.fpr[n]));
  156                 LFP(0);         LFP(1);         LFP(2);         LFP(3);
  157                 LFP(4);         LFP(5);         LFP(6);         LFP(7);
  158                 LFP(8);         LFP(9);         LFP(10);        LFP(11);
  159                 LFP(12);        LFP(13);        LFP(14);        LFP(15);
  160                 LFP(16);        LFP(17);        LFP(18);        LFP(19);
  161                 LFP(20);        LFP(21);        LFP(22);        LFP(23);
  162                 LFP(24);        LFP(25);        LFP(26);        LFP(27);
  163                 LFP(28);        LFP(29);        LFP(30);        LFP(31);
  164         #undef LFP
  165         } else {
  166         #define LFP(n)   __asm ("lfd " #n ", 0(%0)" \
  167                         :: "b"(&pcb->pcb_fpu.fpr[n]));
  168                 LFP(0);         LFP(1);         LFP(2);         LFP(3);
  169                 LFP(4);         LFP(5);         LFP(6);         LFP(7);
  170                 LFP(8);         LFP(9);         LFP(10);        LFP(11);
  171                 LFP(12);        LFP(13);        LFP(14);        LFP(15);
  172                 LFP(16);        LFP(17);        LFP(18);        LFP(19);
  173                 LFP(20);        LFP(21);        LFP(22);        LFP(23);
  174                 LFP(24);        LFP(25);        LFP(26);        LFP(27);
  175                 LFP(28);        LFP(29);        LFP(30);        LFP(31);
  176         #undef LFP
  177         }
  178 
  179         isync();
  180         mtmsr(msr);
  181 }
  182 
  183 void
  184 save_fpu(struct thread *td)
  185 {
  186         struct  pcb *pcb;
  187 
  188         pcb = td->td_pcb;
  189 
  190         save_fpu_int(td);
  191 
  192         /*
  193          * Clear the current fp thread and pcb's CPU id
  194          * XXX should this be left clear to allow lazy save/restore ?
  195          */
  196         pcb->pcb_fpcpu = INT_MAX;
  197         PCPU_SET(fputhread, NULL);
  198 }
  199 
  200 /*
  201  * Save fpu state without dropping ownership.  This will only save state if
  202  * the current fpu thread is `td'.
  203  */
  204 void
  205 save_fpu_nodrop(struct thread *td)
  206 {
  207         struct thread *ftd;
  208 
  209         ftd = PCPU_GET(fputhread);
  210         if (td != ftd) {
  211                 return;
  212         }
  213 
  214         save_fpu_int(td);
  215 }

Cache object: 424458e26fcfecaa9a1f6e991bb47782


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