1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (c) 2010 Cavium Networks, Inc.
 7 */
 8
 9#include <linux/jump_label.h>
10#include <linux/kernel.h>
11#include <linux/memory.h>
12#include <linux/mutex.h>
13#include <linux/types.h>
14#include <linux/cpu.h>
15
16#include <asm/cacheflush.h>
17#include <asm/inst.h>
18
19#ifdef HAVE_JUMP_LABEL
20
21#define J_RANGE_MASK ((1ul << 28) - 1)
22
23void arch_jump_label_transform(struct jump_entry *e,
24			       enum jump_label_type type)
25{
26	union mips_instruction insn;
27	union mips_instruction *insn_p =
28		(union mips_instruction *)(unsigned long)e->code;
29
30	/* Jump only works within a 256MB aligned region. */
31	BUG_ON((e->target & ~J_RANGE_MASK) != (e->code & ~J_RANGE_MASK));
32
33	/* Target must have 4 byte alignment. */
34	BUG_ON((e->target & 3) != 0);
35
36	if (type == JUMP_LABEL_ENABLE) {
37		insn.j_format.opcode = j_op;
38		insn.j_format.target = (e->target & J_RANGE_MASK) >> 2;
39	} else {
40		insn.word = 0; /* nop */
41	}
42
43	get_online_cpus();
44	mutex_lock(&text_mutex);
45	*insn_p = insn;
46
47	flush_icache_range((unsigned long)insn_p,
48			   (unsigned long)insn_p + sizeof(*insn_p));
49
50	mutex_unlock(&text_mutex);
51	put_online_cpus();
52}
53
54#endif /* HAVE_JUMP_LABEL */

 1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (c) 2010 Cavium Networks, Inc.
 7 */
 8
 9#include <linux/jump_label.h>
10#include <linux/kernel.h>
11#include <linux/memory.h>
12#include <linux/mutex.h>
13#include <linux/types.h>
14#include <linux/cpu.h>
15
16#include <asm/cacheflush.h>
17#include <asm/inst.h>
18
19#ifdef HAVE_JUMP_LABEL
20
21#define J_RANGE_MASK ((1ul << 28) - 1)
22
23void arch_jump_label_transform(struct jump_entry *e,
24			       enum jump_label_type type)
25{
26	union mips_instruction insn;
27	union mips_instruction *insn_p =
28		(union mips_instruction *)(unsigned long)e->code;
29
30	/* Jump only works within a 256MB aligned region. */
31	BUG_ON((e->target & ~J_RANGE_MASK) != (e->code & ~J_RANGE_MASK));
32
33	/* Target must have 4 byte alignment. */
34	BUG_ON((e->target & 3) != 0);
35
36	if (type == JUMP_LABEL_ENABLE) {
37		insn.j_format.opcode = j_op;
38		insn.j_format.target = (e->target & J_RANGE_MASK) >> 2;
39	} else {
40		insn.word = 0; /* nop */
41	}
42
43	get_online_cpus();
44	mutex_lock(&text_mutex);
45	*insn_p = insn;
46
47	flush_icache_range((unsigned long)insn_p,
48			   (unsigned long)insn_p + sizeof(*insn_p));
49
50	mutex_unlock(&text_mutex);
51	put_online_cpus();
52}
53
54#endif /* HAVE_JUMP_LABEL */