arch/powerpc/math-emu/mcrfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/errno.h>
   4 #include <linux/uaccess.h>
   5
   6 #include <asm/sfp-machine.h>
   7 #include <math-emu/soft-fp.h>
   8
   9 int
  10 mcrfs(u32 *ccr, u32 crfD, u32 crfS)
  11 {
  12         u32 value, clear;
  13
  14 #ifdef DEBUG
  15         printk("%s: %p (%08x) %d %d\n", __func__, ccr, *ccr, crfD, crfS);
  16 #endif
  17
  18         clear = 15 << ((7 - crfS) << 2);
  19         if (!crfS)
  20                 clear = 0x90000000;
  21
  22         value = (__FPU_FPSCR >> ((7 - crfS) << 2)) & 15;
  23         __FPU_FPSCR &= ~(clear);
  24
  25         *ccr &= ~(15 << ((7 - crfD) << 2));
  26         *ccr |= (value << ((7 - crfD) << 2));
  27
  28 #ifdef DEBUG
  29         printk("CR: %08x\n", __func__, *ccr);
  30 #endif
  31
  32         return 0;
  33 }