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
28static 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
45void 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 */