mtfsf.c

Go to the documentation of this file.

#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 (FM == 0)
        return 0;

    if (FM == 0xff)
        mask = 0x9fffffff;
    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;
    }

    __FPU_FPSCR &= ~(mask);
    __FPU_FPSCR |= (frB[1] & mask);

    __FPU_FPSCR &= ~(FPSCR_VX);
    if (__FPU_FPSCR & (FPSCR_VXSNAN | FPSCR_VXISI | FPSCR_VXIDI |
             FPSCR_VXZDZ | FPSCR_VXIMZ | FPSCR_VXVC |
             FPSCR_VXSOFT | FPSCR_VXSQRT | FPSCR_VXCVI))
        __FPU_FPSCR |= FPSCR_VX;

    fpscr = __FPU_FPSCR;
    fpscr &= ~(FPSCR_FEX);
    if (((fpscr & FPSCR_VX) && (fpscr & FPSCR_VE)) ||
        ((fpscr & FPSCR_OX) && (fpscr & FPSCR_OE)) ||
        ((fpscr & FPSCR_UX) && (fpscr & FPSCR_UE)) ||
        ((fpscr & FPSCR_ZX) && (fpscr & FPSCR_ZE)) ||
        ((fpscr & FPSCR_XX) && (fpscr & FPSCR_XE)))
        fpscr |= FPSCR_FEX;
    __FPU_FPSCR = fpscr;

#ifdef DEBUG
    printk("%s: %02x %p: %08lx\n", __func__, FM, frB, __FPU_FPSCR);
#endif

    return 0;
}