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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#include <asm/asm-compat.h>
18
19#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
20#define JUMP_LABEL_NOP_SIZE 4
21
22static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
23{
24 asm_volatile_goto("1:\n\t"
25 "nop # arch_static_branch\n\t"
26 ".pushsection __jump_table, \"aw\"\n\t"
27 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
28 ".popsection \n\t"
29 : : "i" (&((char *)key)[branch]) : : l_yes);
30
31 return false;
32l_yes:
33 return true;
34}
35
36static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
37{
38 asm_volatile_goto("1:\n\t"
39 "b %l[l_yes] # arch_static_branch_jump\n\t"
40 ".pushsection __jump_table, \"aw\"\n\t"
41 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
42 ".popsection \n\t"
43 : : "i" (&((char *)key)[branch]) : : l_yes);
44
45 return false;
46l_yes:
47 return true;
48}
49
50#ifdef CONFIG_PPC64
51typedef u64 jump_label_t;
52#else
53typedef u32 jump_label_t;
54#endif
55
56struct jump_entry {
57 jump_label_t code;
58 jump_label_t target;
59 jump_label_t key;
60};
61
62#else
63#define ARCH_STATIC_BRANCH(LABEL, KEY) \
641098: nop; \
65 .pushsection __jump_table, "aw"; \
66 FTR_ENTRY_LONG 1098b, LABEL, KEY; \
67 .popsection
68#endif
69
70#endif /* _ASM_POWERPC_JUMP_LABEL_H */