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 18 #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) 19 #define JUMP_LABEL_NOP_SIZE 4 20 21 static __always_inline bool arch_static_branch(struct static_key *key, bool branch) 22 { 23 asm_volatile_goto("1:\n\t" 24 "nop\n\t" 25 ".pushsection __jump_table, \"aw\"\n\t" 26 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 27 ".popsection \n\t" 28 : : "i" (&((char *)key)[branch]) : : l_yes); 29 30 return false; 31 l_yes: 32 return true; 33 } 34 35 static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) 36 { 37 asm_volatile_goto("1:\n\t" 38 "b %l[l_yes]\n\t" 39 ".pushsection __jump_table, \"aw\"\n\t" 40 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" 41 ".popsection \n\t" 42 : : "i" (&((char *)key)[branch]) : : l_yes); 43 44 return false; 45 l_yes: 46 return true; 47 } 48 49 #ifdef CONFIG_PPC64 50 typedef u64 jump_label_t; 51 #else 52 typedef u32 jump_label_t; 53 #endif 54 55 struct jump_entry { 56 jump_label_t code; 57 jump_label_t target; 58 jump_label_t key; 59 }; 60 61 #else 62 #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 63 1098: nop; \ 64 .pushsection __jump_table, "aw"; \ 65 FTR_ENTRY_LONG 1098b, LABEL, KEY; \ 66 .popsection 67 #endif 68 69 #endif /* _ASM_POWERPC_JUMP_LABEL_H */ 70