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1 | /* | |
2 | * Based on arch/arm/lib/bitops.h | |
3 | * | |
4 | * Copyright (C) 2013 ARM Ltd. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <linux/linkage.h> | |
20 | #include <asm/assembler.h> | |
21 | ||
22 | /* | |
23 | * x0: bits 5:0 bit offset | |
24 | * bits 31:6 word offset | |
25 | * x1: address | |
26 | */ | |
27 | .macro bitop, name, instr | |
28 | ENTRY( \name ) | |
29 | and w3, w0, #63 // Get bit offset | |
30 | eor w0, w0, w3 // Clear low bits | |
31 | mov x2, #1 | |
32 | add x1, x1, x0, lsr #3 // Get word offset | |
33 | lsl x3, x2, x3 // Create mask | |
34 | 1: ldxr x2, [x1] | |
35 | \instr x2, x2, x3 | |
36 | stxr w0, x2, [x1] | |
37 | cbnz w0, 1b | |
38 | ret | |
39 | ENDPROC(\name ) | |
40 | .endm | |
41 | ||
42 | .macro testop, name, instr | |
43 | ENTRY( \name ) | |
44 | and w3, w0, #63 // Get bit offset | |
45 | eor w0, w0, w3 // Clear low bits | |
46 | mov x2, #1 | |
47 | add x1, x1, x0, lsr #3 // Get word offset | |
48 | lsl x4, x2, x3 // Create mask | |
49 | 1: ldxr x2, [x1] | |
50 | lsr x0, x2, x3 // Save old value of bit | |
51 | \instr x2, x2, x4 // toggle bit | |
52 | stlxr w5, x2, [x1] | |
53 | cbnz w5, 1b | |
54 | dmb ish | |
55 | and x0, x0, #1 | |
56 | 3: ret | |
57 | ENDPROC(\name ) | |
58 | .endm | |
59 | ||
60 | /* | |
61 | * Atomic bit operations. | |
62 | */ | |
63 | bitop change_bit, eor | |
64 | bitop clear_bit, bic | |
65 | bitop set_bit, orr | |
66 | ||
67 | testop test_and_change_bit, eor | |
68 | testop test_and_clear_bit, bic | |
69 | testop test_and_set_bit, orr |