LXR linux/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
   9int
  10mcrfs(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}
  34