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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#ifndef _ASM_MIPS_JUMP_LABEL_H
9#define _ASM_MIPS_JUMP_LABEL_H
10
11#ifndef __ASSEMBLY__
12
13#include <linux/types.h>
14
15#define JUMP_LABEL_NOP_SIZE 4
16
17#ifdef CONFIG_64BIT
18#define WORD_INSN ".dword"
19#else
20#define WORD_INSN ".word"
21#endif
22
23#ifdef CONFIG_CPU_MICROMIPS
24#define NOP_INSN "nop32"
25#else
26#define NOP_INSN "nop"
27#endif
28
29static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
30{
31 asm_volatile_goto("1:\t" NOP_INSN "\n\t"
32 "nop\n\t"
33 ".pushsection __jump_table, \"aw\"\n\t"
34 WORD_INSN " 1b, %l[l_yes], %0\n\t"
35 ".popsection\n\t"
36 : : "i" (&((char *)key)[branch]) : : l_yes);
37
38 return false;
39l_yes:
40 return true;
41}
42
43static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
44{
45 asm_volatile_goto("1:\tj %l[l_yes]\n\t"
46 "nop\n\t"
47 ".pushsection __jump_table, \"aw\"\n\t"
48 WORD_INSN " 1b, %l[l_yes], %0\n\t"
49 ".popsection\n\t"
50 : : "i" (&((char *)key)[branch]) : : l_yes);
51
52 return false;
53l_yes:
54 return true;
55}
56
57#ifdef CONFIG_64BIT
58typedef u64 jump_label_t;
59#else
60typedef u32 jump_label_t;
61#endif
62
63struct jump_entry {
64 jump_label_t code;
65 jump_label_t target;
66 jump_label_t key;
67};
68
69#endif /* __ASSEMBLY__ */
70#endif /* _ASM_MIPS_JUMP_LABEL_H */