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 static __always_inline bool arch_static_branch(struct static_key *key) 24 { 25 asm_volatile_goto("1:\tnop\n\t" 26 "nop\n\t" 27 ".pushsection __jump_table, \"aw\"\n\t" 28 WORD_INSN " 1b, %l[l_yes], %0\n\t" 29 ".popsection\n\t" 30 : : "i" (key) : : l_yes); 31 return false; 32 l_yes: 33 return true; 34 } 35 36 #endif /* __KERNEL__ */ 37 38 #ifdef CONFIG_64BIT 39 typedef u64 jump_label_t; 40 #else 41 typedef u32 jump_label_t; 42 #endif 43 44 struct jump_entry { 45 jump_label_t code; 46 jump_label_t target; 47 jump_label_t key; 48 }; 49 50 #endif /* _ASM_MIPS_JUMP_LABEL_H */ 51