| Jiang Liu | 9732caf | 2014-01-07 22:17:13 +0800 | [diff] [blame] | 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 | |
| 28 | static __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; |
| 38 | l_yes: |
| 39 | return true; |
| 40 | } |
| 41 | |
| 42 | #endif /* __KERNEL__ */ |
| 43 | |
| 44 | typedef u64 jump_label_t; |
| 45 | |
| 46 | struct 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 */ |