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Linux kernel mirror (for testing)
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1#ifndef _ASM_POWERPC_JUMP_LABEL_H
2#define _ASM_POWERPC_JUMP_LABEL_H
3
4/*
5 * Copyright 2010 Michael Ellerman, IBM Corp.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#ifndef __ASSEMBLY__
14#include <linux/types.h>
15
16#include <asm/feature-fixups.h>
17
18#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
19#define JUMP_LABEL_NOP_SIZE 4
20
21static __always_inline bool arch_static_branch(struct static_key *key)
22{
23 asm_volatile_goto("1:\n\t"
24 "nop\n\t"
25 ".pushsection __jump_table, \"aw\"\n\t"
26 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
27 ".popsection \n\t"
28 : : "i" (key) : : l_yes);
29 return false;
30l_yes:
31 return true;
32}
33
34#ifdef CONFIG_PPC64
35typedef u64 jump_label_t;
36#else
37typedef u32 jump_label_t;
38#endif
39
40struct jump_entry {
41 jump_label_t code;
42 jump_label_t target;
43 jump_label_t key;
44};
45
46#else
47#define ARCH_STATIC_BRANCH(LABEL, KEY) \
481098: nop; \
49 .pushsection __jump_table, "aw"; \
50 FTR_ENTRY_LONG 1098b, LABEL, KEY; \
51 .popsection
52#endif
53
54#endif /* _ASM_POWERPC_JUMP_LABEL_H */