projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ac5f89c7 ME |
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 | ||
| cc1adb5f | 13 | #ifndef __ASSEMBLY__ |
| ac5f89c7 ME |
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 | ||
| 11276d53 | 21 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
| ac5f89c7 | 22 | { |
| 3f0116c3 | 23 | asm_volatile_goto("1:\n\t" |
| ac5f89c7 ME |
24 | "nop\n\t" |
| 25 | ".pushsection __jump_table, \"aw\"\n\t" | |
| ac5f89c7 ME |
26 | JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t" |
| 27 | ".popsection \n\t" | |
| 11276d53 PZ |
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 | ||
| ac5f89c7 ME |
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; | |
| ac5f89c7 ME |
59 | }; |
| 60 | ||
| cc1adb5f AB |
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 | ||
| ac5f89c7 | 69 | #endif /* _ASM_POWERPC_JUMP_LABEL_H */ |