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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