tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/types.h>
12
13#ifdef __KERNEL__
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)
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" (key) : : l_yes);
37 return false;
38l_yes:
39 return true;
40}
41
42#endif /* __KERNEL__ */
43
44#ifdef CONFIG_64BIT
45typedef u64 jump_label_t;
46#else
47typedef u32 jump_label_t;
48#endif
49
50struct jump_entry {
51 jump_label_t code;
52 jump_label_t target;
53 jump_label_t key;
54};
55
56#endif /* _ASM_MIPS_JUMP_LABEL_H */