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 #include <linux/types.h> 14 15 #include <asm/feature-fixups.h> 16 17 #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) 18 #define JUMP_LABEL_NOP_SIZE 4 19 20 static __always_inline bool arch_static_branch(struct jump_label_key *key) 21 { 22 asm goto("1:\n\t" 23 "nop\n\t" 24 ".pushsection __jump_table, \"aw\"\n\t" 25 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 26 ".popsection \n\t" 27 : : "i" (key) : : l_yes); 28 return false; 29 l_yes: 30 return true; 31 } 32 33 #ifdef CONFIG_PPC64 34 typedef u64 jump_label_t; 35 #else 36 typedef u32 jump_label_t; 37 #endif 38 39 struct jump_entry { 40 jump_label_t code; 41 jump_label_t target; 42 jump_label_t key; 43 }; 44 45 #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 46