arch/powerpc/math-emu/mcrfs.c

   1 #include <linux/types.h>
   2 #include <linux/errno.h>
   3 #include <asm/uaccess.h>
   4
   5 #include <asm/sfp-machine.h>
   6 #include <math-emu/soft-fp.h>
   7
   8 int
   9 mcrfs(u32 *ccr, u32 crfD, u32 crfS)
  10 {
  11         u32 value, clear;
  12
  13 #ifdef DEBUG
  14         printk("%s: %p (%08x) %d %d\n", __func__, ccr, *ccr, crfD, crfS);
  15 #endif
  16
  17         clear = 15 << ((7 - crfS) << 2);
  18         if (!crfS)
  19                 clear = 0x90000000;
  20
  21         value = (__FPU_FPSCR >> ((7 - crfS) << 2)) & 15;
  22         __FPU_FPSCR &= ~(clear);
  23
  24         *ccr &= ~(15 << ((7 - crfD) << 2));
  25         *ccr |= (value << ((7 - crfD) << 2));
  26
  27 #ifdef DEBUG
  28         printk("CR: %08x\n", __func__, *ccr);
  29 #endif
  30
  31         return 0;
  32 }