1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2023 Loongson Technology Corporation Limited
4 *
5 * Based on arch/arm64/include/asm/jump_label.h
6 */
7#ifndef __ASM_JUMP_LABEL_H
8#define __ASM_JUMP_LABEL_H
9
10#ifndef __ASSEMBLY__
11
12#include <linux/types.h>
13
14#define JUMP_LABEL_NOP_SIZE	4
15
16#define JUMP_TABLE_ENTRY				\
17	 ".pushsection	__jump_table, \"aw\"	\n\t"	\
18	 ".align	3			\n\t"	\
19	 ".long		1b - ., %l[l_yes] - .	\n\t"	\
20	 ".quad		%0 - .			\n\t"	\
21	 ".popsection				\n\t"
22
23static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch)
24{
25	asm goto(
26		"1:	nop			\n\t"
27		JUMP_TABLE_ENTRY
28		:  :  "i"(&((char *)key)[branch]) :  : l_yes);
29
30	return false;
31
32l_yes:
33	return true;
34}
35
36static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch)
37{
38	asm goto(
39		"1:	b	%l[l_yes]	\n\t"
40		JUMP_TABLE_ENTRY
41		:  :  "i"(&((char *)key)[branch]) :  : l_yes);
42
43	return false;
44
45l_yes:
46	return true;
47}
48
49#endif  /* __ASSEMBLY__ */
50#endif	/* __ASM_JUMP_LABEL_H */
51