1ac5f89c7SMichael Ellerman #ifndef _ASM_POWERPC_JUMP_LABEL_H 2ac5f89c7SMichael Ellerman #define _ASM_POWERPC_JUMP_LABEL_H 3ac5f89c7SMichael Ellerman 4ac5f89c7SMichael Ellerman /* 5ac5f89c7SMichael Ellerman * Copyright 2010 Michael Ellerman, IBM Corp. 6ac5f89c7SMichael Ellerman * 7ac5f89c7SMichael Ellerman * This program is free software; you can redistribute it and/or 8ac5f89c7SMichael Ellerman * modify it under the terms of the GNU General Public License 9ac5f89c7SMichael Ellerman * as published by the Free Software Foundation; either version 10ac5f89c7SMichael Ellerman * 2 of the License, or (at your option) any later version. 11ac5f89c7SMichael Ellerman */ 12ac5f89c7SMichael Ellerman 13ac5f89c7SMichael Ellerman #include <linux/types.h> 14ac5f89c7SMichael Ellerman 15ac5f89c7SMichael Ellerman #include <asm/feature-fixups.h> 16ac5f89c7SMichael Ellerman 17ac5f89c7SMichael Ellerman #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) 18ac5f89c7SMichael Ellerman #define JUMP_LABEL_NOP_SIZE 4 19ac5f89c7SMichael Ellerman 20c5905afbSIngo Molnar static __always_inline bool arch_static_branch(struct static_key *key) 21ac5f89c7SMichael Ellerman { 22*3f0116c3SIngo Molnar asm_volatile_goto("1:\n\t" 23ac5f89c7SMichael Ellerman "nop\n\t" 24ac5f89c7SMichael Ellerman ".pushsection __jump_table, \"aw\"\n\t" 25ac5f89c7SMichael Ellerman JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 26ac5f89c7SMichael Ellerman ".popsection \n\t" 27ac5f89c7SMichael Ellerman : : "i" (key) : : l_yes); 28ac5f89c7SMichael Ellerman return false; 29ac5f89c7SMichael Ellerman l_yes: 30ac5f89c7SMichael Ellerman return true; 31ac5f89c7SMichael Ellerman } 32ac5f89c7SMichael Ellerman 33ac5f89c7SMichael Ellerman #ifdef CONFIG_PPC64 34ac5f89c7SMichael Ellerman typedef u64 jump_label_t; 35ac5f89c7SMichael Ellerman #else 36ac5f89c7SMichael Ellerman typedef u32 jump_label_t; 37ac5f89c7SMichael Ellerman #endif 38ac5f89c7SMichael Ellerman 39ac5f89c7SMichael Ellerman struct jump_entry { 40ac5f89c7SMichael Ellerman jump_label_t code; 41ac5f89c7SMichael Ellerman jump_label_t target; 42ac5f89c7SMichael Ellerman jump_label_t key; 43ac5f89c7SMichael Ellerman }; 44ac5f89c7SMichael Ellerman 45ac5f89c7SMichael Ellerman #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 46