diff options
Diffstat (limited to 'arch/powerpc/math-emu/mtfsf.c')
| -rw-r--r-- | arch/powerpc/math-emu/mtfsf.c | 56 |
1 files changed, 31 insertions, 25 deletions
diff --git a/arch/powerpc/math-emu/mtfsf.c b/arch/powerpc/math-emu/mtfsf.c index 48014d8e3af..44b0fc8214f 100644 --- a/arch/powerpc/math-emu/mtfsf.c +++ b/arch/powerpc/math-emu/mtfsf.c @@ -2,40 +2,46 @@ #include <linux/errno.h> #include <asm/uaccess.h> -#include "soft-fp.h" +#include <asm/sfp-machine.h> +#include <math-emu/soft-fp.h> int mtfsf(unsigned int FM, u32 *frB) { u32 mask; + u32 fpscr; - if (FM == 0) - return 0; - - if (FM == 0xff) - mask = 0x9fffffff; + if (likely(FM == 1)) + mask = 0x0f; + else if (likely(FM == 0xff)) + mask = ~0; else { - mask = 0; - if (FM & (1 << 0)) - mask |= 0x90000000; - if (FM & (1 << 1)) - mask |= 0x0f000000; - if (FM & (1 << 2)) - mask |= 0x00f00000; - if (FM & (1 << 3)) - mask |= 0x000f0000; - if (FM & (1 << 4)) - mask |= 0x0000f000; - if (FM & (1 << 5)) - mask |= 0x00000f00; - if (FM & (1 << 6)) - mask |= 0x000000f0; - if (FM & (1 << 7)) - mask |= 0x0000000f; + 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; } - __FPU_FPSCR &= ~(mask); - __FPU_FPSCR |= (frB[1] & mask); + 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); |