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 | |