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Linux/arch/powerpc/math-emu/mtfsf.c

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  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 mtfsf(unsigned int FM, u32 *frB)
 11 {
 12         u32 mask;
 13         u32 fpscr;
 14 
 15         if (likely(FM == 1))
 16                 mask = 0x0f;
 17         else if (likely(FM == 0xff))
 18                 mask = ~0;
 19         else {
 20                 mask = ((FM & 1) |
 21                                 ((FM << 3) & 0x10) |
 22                                 ((FM << 6) & 0x100) |
 23                                 ((FM << 9) & 0x1000) |
 24                                 ((FM << 12) & 0x10000) |
 25                                 ((FM << 15) & 0x100000) |
 26                                 ((FM << 18) & 0x1000000) |
 27                                 ((FM << 21) & 0x10000000)) * 15;
 28         }
 29 
 30         fpscr = ((__FPU_FPSCR & ~mask) | (frB[1] & mask)) &
 31                 ~(FPSCR_VX | FPSCR_FEX | 0x800);
 32 
 33         if (fpscr & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
 34                      FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
 35                      FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
 36                 fpscr |= FPSCR_VX;
 37 
 38         /* The bit order of exception enables and exception status
 39          * is the same. Simply shift and mask to check for enabled
 40          * exceptions.
 41          */
 42         if (fpscr & (fpscr >> 22) &  0xf8)
 43                 fpscr |= FPSCR_FEX;
 44 
 45         __FPU_FPSCR = fpscr;
 46 
 47 #ifdef DEBUG
 48         printk("%s: %02x %p: %08lx\n", __func__, FM, frB, __FPU_FPSCR);
 49 #endif
 50 
 51         return 0;
 52 }
 53 

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