tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2013 Huawei Ltd.
3 * Author: Jiang Liu <liuj97@gmail.com>
4 *
5 * Based on arch/arm/include/asm/jump_label.h
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef __ASM_JUMP_LABEL_H
20#define __ASM_JUMP_LABEL_H
21#include <linux/types.h>
22#include <asm/insn.h>
23
24#ifdef __KERNEL__
25
26#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
27
28static __always_inline bool arch_static_branch(struct static_key *key)
29{
30 asm goto("1: nop\n\t"
31 ".pushsection __jump_table, \"aw\"\n\t"
32 ".align 3\n\t"
33 ".quad 1b, %l[l_yes], %c0\n\t"
34 ".popsection\n\t"
35 : : "i"(key) : : l_yes);
36
37 return false;
38l_yes:
39 return true;
40}
41
42#endif /* __KERNEL__ */
43
44typedef u64 jump_label_t;
45
46struct jump_entry {
47 jump_label_t code;
48 jump_label_t target;
49 jump_label_t key;
50};
51
52#endif /* __ASM_JUMP_LABEL_H */