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65a792e8 ZL |
1 | /* |
2 | * Copyright 2015 Tilera Corporation. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation, version 2. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
11 | * NON INFRINGEMENT. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * jump label TILE-Gx support | |
15 | */ | |
16 | ||
17 | #include <linux/jump_label.h> | |
18 | #include <linux/memory.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/cpu.h> | |
22 | ||
23 | #include <asm/cacheflush.h> | |
24 | #include <asm/insn.h> | |
25 | ||
26 | #ifdef HAVE_JUMP_LABEL | |
27 | ||
28 | static void __jump_label_transform(struct jump_entry *e, | |
29 | enum jump_label_type type) | |
30 | { | |
31 | tilegx_bundle_bits opcode; | |
32 | /* Operate on writable kernel text mapping. */ | |
33 | unsigned long pc_wr = ktext_writable_addr(e->code); | |
34 | ||
35 | if (type == JUMP_LABEL_JMP) | |
36 | opcode = tilegx_gen_branch(e->code, e->target, false); | |
37 | else | |
38 | opcode = NOP(); | |
39 | ||
40 | *(tilegx_bundle_bits *)pc_wr = opcode; | |
41 | /* Make sure that above mem writes were issued towards the memory. */ | |
42 | smp_wmb(); | |
43 | } | |
44 | ||
45 | void arch_jump_label_transform(struct jump_entry *e, | |
46 | enum jump_label_type type) | |
47 | { | |
48 | get_online_cpus(); | |
49 | mutex_lock(&text_mutex); | |
50 | ||
51 | __jump_label_transform(e, type); | |
52 | flush_icache_range(e->code, e->code + sizeof(tilegx_bundle_bits)); | |
53 | ||
54 | mutex_unlock(&text_mutex); | |
55 | put_online_cpus(); | |
56 | } | |
57 | ||
58 | __init_or_module void arch_jump_label_transform_static(struct jump_entry *e, | |
59 | enum jump_label_type type) | |
60 | { | |
61 | __jump_label_transform(e, type); | |
62 | } | |
63 | ||
64 | #endif /* HAVE_JUMP_LABEL */ |