// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/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;
}