arch/powerpc/math-emu/mtfsf.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 mtfsf(unsigned int FM, u32 *frB)
  10 {
  11         u32 mask;
  12         u32 fpscr;
  13
  14         if (likely(FM == 1))
  15                 mask = 0x0f;
  16         else if (likely(FM == 0xff))
  17                 mask = ~0;
  18         else {
  19                 mask = ((FM & 1) |
  20                                 ((FM << 3) & 0x10) |
  21                                 ((FM << 6) & 0x100) |
  22                                 ((FM << 9) & 0x1000) |
  23                                 ((FM << 12) & 0x10000) |
  24                                 ((FM << 15) & 0x100000) |
  25                                 ((FM << 18) & 0x1000000) |
  26                                 ((FM << 21) & 0x10000000)) * 15;
  27         }
  28
  29         fpscr = ((__FPU_FPSCR & ~mask) | (frB[1] & mask)) &
  30                 ~(FPSCR_VX | FPSCR_FEX | 0x800);
  31
  32         if (fpscr & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
  33                      FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
  34                      FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
  35                 fpscr |= FPSCR_VX;
  36
  37         /* The bit order of exception enables and exception status
  38          * is the same. Simply shift and mask to check for enabled
  39          * exceptions.
  40          */
  41         if (fpscr & (fpscr >> 22) &  0xf8)
  42                 fpscr |= FPSCR_FEX;
  43
  44         __FPU_FPSCR = fpscr;
  45
  46 #ifdef DEBUG
  47         printk("%s: %02x %p: %08lx\n", __func__, FM, frB, __FPU_FPSCR);
  48 #endif
  49
  50         return 0;
  51 }