diff options
Diffstat (limited to 'arch/mn10300/include/asm/rwlock.h')
| -rw-r--r-- | arch/mn10300/include/asm/rwlock.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/mn10300/include/asm/rwlock.h b/arch/mn10300/include/asm/rwlock.h new file mode 100644 index 000000000000..6d594d4a0e10 --- /dev/null +++ b/arch/mn10300/include/asm/rwlock.h | |||
| @@ -0,0 +1,125 @@ | |||
| 1 | /* | ||
| 2 | * Helpers used by both rw spinlocks and rw semaphores. | ||
| 3 | * | ||
| 4 | * Based in part on code from semaphore.h and | ||
| 5 | * spinlock.h Copyright 1996 Linus Torvalds. | ||
| 6 | * | ||
| 7 | * Copyright 1999 Red Hat, Inc. | ||
| 8 | * | ||
| 9 | * Written by Benjamin LaHaise. | ||
| 10 | * | ||
| 11 | * Modified by Matsushita Electric Industrial Co., Ltd. | ||
| 12 | * Modifications: | ||
| 13 | * 13-Nov-2006 MEI Temporarily delete lock functions for SMP support. | ||
| 14 | * | ||
| 15 | * This program is free software; you can redistribute it and/or modify it | ||
| 16 | * under the terms of the GNU General Public License as published by the Free | ||
| 17 | * Software Foundation; either version 2 of the License, or (at your option) | ||
| 18 | * any later version. | ||
| 19 | */ | ||
| 20 | #ifndef _ASM_RWLOCK_H | ||
| 21 | #define _ASM_RWLOCK_H | ||
| 22 | |||
| 23 | #define RW_LOCK_BIAS 0x01000000 | ||
| 24 | |||
| 25 | #ifndef CONFIG_SMP | ||
| 26 | |||
| 27 | typedef struct { unsigned long a[100]; } __dummy_lock_t; | ||
| 28 | #define __dummy_lock(lock) (*(__dummy_lock_t *)(lock)) | ||
| 29 | |||
| 30 | #define RW_LOCK_BIAS_STR "0x01000000" | ||
| 31 | |||
| 32 | #define __build_read_lock_ptr(rw, helper) \ | ||
| 33 | do { \ | ||
| 34 | asm volatile( \ | ||
| 35 | " mov (%0),d3 \n" \ | ||
| 36 | " sub 1,d3 \n" \ | ||
| 37 | " mov d3,(%0) \n" \ | ||
| 38 | " blt 1f \n" \ | ||
| 39 | " bra 2f \n" \ | ||
| 40 | "1: jmp 3f \n" \ | ||
| 41 | "2: \n" \ | ||
| 42 | " .section .text.lock,\"ax\" \n" \ | ||
| 43 | "3: call "helper"[],0 \n" \ | ||
| 44 | " jmp 2b \n" \ | ||
| 45 | " .previous" \ | ||
| 46 | : \ | ||
| 47 | : "d" (rw) \ | ||
| 48 | : "memory", "d3", "cc"); \ | ||
| 49 | } while (0) | ||
| 50 | |||
| 51 | #define __build_read_lock_const(rw, helper) \ | ||
| 52 | do { \ | ||
| 53 | asm volatile( \ | ||
| 54 | " mov (%0),d3 \n" \ | ||
| 55 | " sub 1,d3 \n" \ | ||
| 56 | " mov d3,(%0) \n" \ | ||
| 57 | " blt 1f \n" \ | ||
| 58 | " bra 2f \n" \ | ||
| 59 | "1: jmp 3f \n" \ | ||
| 60 | "2: \n" \ | ||
| 61 | " .section .text.lock,\"ax\" \n" \ | ||
| 62 | "3: call "helper"[],0 \n" \ | ||
| 63 | " jmp 2b \n" \ | ||
| 64 | " .previous" \ | ||
| 65 | : \ | ||
| 66 | : "d" (rw) \ | ||
| 67 | : "memory", "d3", "cc"); \ | ||
| 68 | } while (0) | ||
| 69 | |||
| 70 | #define __build_read_lock(rw, helper) \ | ||
| 71 | do { \ | ||
| 72 | if (__builtin_constant_p(rw)) \ | ||
| 73 | __build_read_lock_const(rw, helper); \ | ||
| 74 | else \ | ||
| 75 | __build_read_lock_ptr(rw, helper); \ | ||
| 76 | } while (0) | ||
| 77 | |||
| 78 | #define __build_write_lock_ptr(rw, helper) \ | ||
| 79 | do { \ | ||
| 80 | asm volatile( \ | ||
| 81 | " mov (%0),d3 \n" \ | ||
| 82 | " sub 1,d3 \n" \ | ||
| 83 | " mov d3,(%0) \n" \ | ||
| 84 | " blt 1f \n" \ | ||
| 85 | " bra 2f \n" \ | ||
| 86 | "1: jmp 3f \n" \ | ||
| 87 | "2: \n" \ | ||
| 88 | " .section .text.lock,\"ax\" \n" \ | ||
| 89 | "3: call "helper"[],0 \n" \ | ||
| 90 | " jmp 2b \n" \ | ||
| 91 | " .previous" \ | ||
| 92 | : \ | ||
| 93 | : "d" (rw) \ | ||
| 94 | : "memory", "d3", "cc"); \ | ||
| 95 | } while (0) | ||
| 96 | |||
| 97 | #define __build_write_lock_const(rw, helper) \ | ||
| 98 | do { \ | ||
| 99 | asm volatile( \ | ||
| 100 | " mov (%0),d3 \n" \ | ||
| 101 | " sub 1,d3 \n" \ | ||
| 102 | " mov d3,(%0) \n" \ | ||
| 103 | " blt 1f \n" \ | ||
| 104 | " bra 2f \n" \ | ||
| 105 | "1: jmp 3f \n" \ | ||
| 106 | "2: \n" \ | ||
| 107 | " .section .text.lock,\"ax\" \n" \ | ||
| 108 | "3: call "helper"[],0 \n" \ | ||
| 109 | " jmp 2b \n" \ | ||
| 110 | " .previous" \ | ||
| 111 | : \ | ||
| 112 | : "d" (rw) \ | ||
| 113 | : "memory", "d3", "cc"); \ | ||
| 114 | } while (0) | ||
| 115 | |||
| 116 | #define __build_write_lock(rw, helper) \ | ||
| 117 | do { \ | ||
| 118 | if (__builtin_constant_p(rw)) \ | ||
| 119 | __build_write_lock_const(rw, helper); \ | ||
| 120 | else \ | ||
| 121 | __build_write_lock_ptr(rw, helper); \ | ||
| 122 | } while (0) | ||
| 123 | |||
| 124 | #endif /* CONFIG_SMP */ | ||
| 125 | #endif /* _ASM_RWLOCK_H */ | ||