mtfsf.c
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#include <linux/types.h>
#include <linux/errno.h>
#include <asm/uaccess.h>
#include <asm/sfp-machine.h>
#include <math-emu/soft-fp.h>
int
mtfsf(unsigned int FM, u32 *frB)
{
u32 mask;
u32 fpscr;
if (likely(FM == 1))
mask = 0x0f;
else if (likely(FM == 0xff))
mask = ~0;
else {
mask = ((FM & 1) |
((FM << 3) & 0x10) |
((FM << 6) & 0x100) |
((FM << 9) & 0x1000) |
((FM << 12) & 0x10000) |
((FM << 15) & 0x100000) |
((FM << 18) & 0x1000000) |
((FM << 21) & 0x10000000)) * 15;
}
fpscr = ((__FPU_FPSCR & ~mask) | (frB[1] & mask)) &
~(FPSCR_VX | FPSCR_FEX | 0x800);
if (fpscr & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
fpscr |= FPSCR_VX;
/* The bit order of exception enables and exception status
* is the same. Simply shift and mask to check for enabled
* exceptions.
*/
if (fpscr & (fpscr >> 22) & 0xf8)
fpscr |= FPSCR_FEX;
__FPU_FPSCR = fpscr;
#ifdef DEBUG
printk("%s: %02x %p: %08lx\n", __func__, FM, frB, __FPU_FPSCR);
#endif
return 0;
}