arch/mips/math-emu/kernel_linkage.c

   1 /*
   2  *  Kevin D. Kissell, kevink@mips and Carsten Langgaard, carstenl@mips.com
   3  *  Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
   4  *
   5  *  This program is free software; you can distribute it and/or modify it
   6  *  under the terms of the GNU General Public License (Version 2) as
   7  *  published by the Free Software Foundation.
   8  *
   9  *  This program is distributed in the hope it will be useful, but WITHOUT
  10  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  *  for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License along
  15  *  with this program; if not, write to the Free Software Foundation, Inc.,
  16  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  17  *
  18  * Routines corresponding to Linux kernel FP context
  19  * manipulation primitives for the Algorithmics MIPS
  20  * FPU Emulator
  21  */
  22 #include <linux/sched.h>
  23 #include <asm/processor.h>
  24 #include <asm/signal.h>
  25 #include <asm/uaccess.h>
  26
  27 #include <asm/fpu.h>
  28 #include <asm/fpu_emulator.h>
  29
  30 #define SIGNALLING_NAN 0x7ff800007ff80000LL
  31
  32 void fpu_emulator_init_fpu(void)
  33 {
  34         static int first = 1;
  35         int i;
  36
  37         if (first) {
  38                 first = 0;
  39                 printk("Algorithmics/MIPS FPU Emulator v1.5\n");
  40         }
  41
  42         current->thread.fpu.fcr31 = 0;
  43         for (i = 0; i < 32; i++)
  44                 set_fpr64(&current->thread.fpu.fpr[i], 0, SIGNALLING_NAN);
  45 }