summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/jump_label.h
blob: f016bb699b5f6200268d3b8e5bf4e2bd003dbbf7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
#ifndef _ASM_POWERPC_JUMP_LABEL_H
#define _ASM_POWERPC_JUMP_LABEL_H

/*
 * Copyright 2010 Michael Ellerman, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/types.h>

#include <asm/feature-fixups.h>

#define JUMP_ENTRY_TYPE		stringify_in_c(FTR_ENTRY_LONG)
#define JUMP_LABEL_NOP_SIZE	4

static __always_inline bool arch_static_branch(struct static_key *key)
{
	asm_volatile_goto("1:\n\t"
		 "nop\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
		 ".popsection \n\t"
		 : :  "i" (key) : : l_yes);
	return false;
l_yes:
	return true;
}

#ifdef CONFIG_PPC64
typedef u64 jump_label_t;
#else
typedef u32 jump_label_t;
#endif

struct jump_entry {
	jump_label_t code;
	jump_label_t target;
	jump_label_t key;
};

#endif /* _ASM_POWERPC_JUMP_LABEL_H */