Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/include/asm-arm/locks.h |
| 3 | * |
| 4 | * Copyright (C) 2000 Russell King |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * Interrupt safe locking assembler. |
| 11 | */ |
| 12 | #ifndef __ASM_PROC_LOCKS_H |
| 13 | #define __ASM_PROC_LOCKS_H |
| 14 | |
| 15 | #if __LINUX_ARM_ARCH__ >= 6 |
| 16 | |
| 17 | #define __down_op(ptr,fail) \ |
| 18 | ({ \ |
| 19 | __asm__ __volatile__( \ |
| 20 | "@ down_op\n" \ |
| 21 | "1: ldrex lr, [%0]\n" \ |
| 22 | " sub lr, lr, %1\n" \ |
| 23 | " strex ip, lr, [%0]\n" \ |
| 24 | " teq ip, #0\n" \ |
| 25 | " bne 1b\n" \ |
| 26 | " teq lr, #0\n" \ |
| 27 | " movmi ip, %0\n" \ |
| 28 | " blmi " #fail \ |
| 29 | : \ |
| 30 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 31 | : "ip", "lr", "cc"); \ |
| 32 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | }) |
| 34 | |
| 35 | #define __down_op_ret(ptr,fail) \ |
| 36 | ({ \ |
| 37 | unsigned int ret; \ |
| 38 | __asm__ __volatile__( \ |
| 39 | "@ down_op_ret\n" \ |
| 40 | "1: ldrex lr, [%1]\n" \ |
| 41 | " sub lr, lr, %2\n" \ |
| 42 | " strex ip, lr, [%1]\n" \ |
| 43 | " teq ip, #0\n" \ |
| 44 | " bne 1b\n" \ |
| 45 | " teq lr, #0\n" \ |
| 46 | " movmi ip, %1\n" \ |
| 47 | " movpl ip, #0\n" \ |
| 48 | " blmi " #fail "\n" \ |
| 49 | " mov %0, ip" \ |
| 50 | : "=&r" (ret) \ |
| 51 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 52 | : "ip", "lr", "cc"); \ |
| 53 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | ret; \ |
| 55 | }) |
| 56 | |
| 57 | #define __up_op(ptr,wake) \ |
| 58 | ({ \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 59 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | __asm__ __volatile__( \ |
| 61 | "@ up_op\n" \ |
| 62 | "1: ldrex lr, [%0]\n" \ |
| 63 | " add lr, lr, %1\n" \ |
| 64 | " strex ip, lr, [%0]\n" \ |
| 65 | " teq ip, #0\n" \ |
| 66 | " bne 1b\n" \ |
Russell King | 4e8fd22 | 2005-07-24 12:13:40 +0100 | [diff] [blame] | 67 | " cmp lr, #0\n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | " movle ip, %0\n" \ |
| 69 | " blle " #wake \ |
| 70 | : \ |
| 71 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 72 | : "ip", "lr", "cc"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | }) |
| 74 | |
| 75 | /* |
| 76 | * The value 0x01000000 supports up to 128 processors and |
| 77 | * lots of processes. BIAS must be chosen such that sub'ing |
| 78 | * BIAS once per CPU will result in the long remaining |
| 79 | * negative. |
| 80 | */ |
| 81 | #define RW_LOCK_BIAS 0x01000000 |
| 82 | #define RW_LOCK_BIAS_STR "0x01000000" |
| 83 | |
| 84 | #define __down_op_write(ptr,fail) \ |
| 85 | ({ \ |
| 86 | __asm__ __volatile__( \ |
| 87 | "@ down_op_write\n" \ |
| 88 | "1: ldrex lr, [%0]\n" \ |
| 89 | " sub lr, lr, %1\n" \ |
| 90 | " strex ip, lr, [%0]\n" \ |
| 91 | " teq ip, #0\n" \ |
| 92 | " bne 1b\n" \ |
| 93 | " teq lr, #0\n" \ |
| 94 | " movne ip, %0\n" \ |
| 95 | " blne " #fail \ |
| 96 | : \ |
| 97 | : "r" (ptr), "I" (RW_LOCK_BIAS) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 98 | : "ip", "lr", "cc"); \ |
| 99 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | }) |
| 101 | |
| 102 | #define __up_op_write(ptr,wake) \ |
| 103 | ({ \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 104 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | __asm__ __volatile__( \ |
Nicolas Pitre | 9b15c6c | 2005-10-18 07:51:34 +0100 | [diff] [blame^] | 106 | "@ up_op_write\n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | "1: ldrex lr, [%0]\n" \ |
Russell King | 4e8fd22 | 2005-07-24 12:13:40 +0100 | [diff] [blame] | 108 | " adds lr, lr, %1\n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | " strex ip, lr, [%0]\n" \ |
| 110 | " teq ip, #0\n" \ |
| 111 | " bne 1b\n" \ |
| 112 | " movcs ip, %0\n" \ |
| 113 | " blcs " #wake \ |
| 114 | : \ |
| 115 | : "r" (ptr), "I" (RW_LOCK_BIAS) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 116 | : "ip", "lr", "cc"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | }) |
| 118 | |
| 119 | #define __down_op_read(ptr,fail) \ |
| 120 | __down_op(ptr, fail) |
| 121 | |
| 122 | #define __up_op_read(ptr,wake) \ |
| 123 | ({ \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 124 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | __asm__ __volatile__( \ |
| 126 | "@ up_op_read\n" \ |
| 127 | "1: ldrex lr, [%0]\n" \ |
| 128 | " add lr, lr, %1\n" \ |
| 129 | " strex ip, lr, [%0]\n" \ |
| 130 | " teq ip, #0\n" \ |
| 131 | " bne 1b\n" \ |
| 132 | " teq lr, #0\n" \ |
| 133 | " moveq ip, %0\n" \ |
| 134 | " bleq " #wake \ |
| 135 | : \ |
| 136 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 137 | : "ip", "lr", "cc"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | }) |
| 139 | |
| 140 | #else |
| 141 | |
| 142 | #define __down_op(ptr,fail) \ |
| 143 | ({ \ |
| 144 | __asm__ __volatile__( \ |
| 145 | "@ down_op\n" \ |
| 146 | " mrs ip, cpsr\n" \ |
| 147 | " orr lr, ip, #128\n" \ |
| 148 | " msr cpsr_c, lr\n" \ |
| 149 | " ldr lr, [%0]\n" \ |
| 150 | " subs lr, lr, %1\n" \ |
| 151 | " str lr, [%0]\n" \ |
| 152 | " msr cpsr_c, ip\n" \ |
| 153 | " movmi ip, %0\n" \ |
| 154 | " blmi " #fail \ |
| 155 | : \ |
| 156 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 157 | : "ip", "lr", "cc"); \ |
| 158 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | }) |
| 160 | |
| 161 | #define __down_op_ret(ptr,fail) \ |
| 162 | ({ \ |
| 163 | unsigned int ret; \ |
| 164 | __asm__ __volatile__( \ |
| 165 | "@ down_op_ret\n" \ |
| 166 | " mrs ip, cpsr\n" \ |
| 167 | " orr lr, ip, #128\n" \ |
| 168 | " msr cpsr_c, lr\n" \ |
| 169 | " ldr lr, [%1]\n" \ |
| 170 | " subs lr, lr, %2\n" \ |
| 171 | " str lr, [%1]\n" \ |
| 172 | " msr cpsr_c, ip\n" \ |
| 173 | " movmi ip, %1\n" \ |
| 174 | " movpl ip, #0\n" \ |
| 175 | " blmi " #fail "\n" \ |
| 176 | " mov %0, ip" \ |
| 177 | : "=&r" (ret) \ |
| 178 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 179 | : "ip", "lr", "cc"); \ |
| 180 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | ret; \ |
| 182 | }) |
| 183 | |
| 184 | #define __up_op(ptr,wake) \ |
| 185 | ({ \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 186 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | __asm__ __volatile__( \ |
| 188 | "@ up_op\n" \ |
| 189 | " mrs ip, cpsr\n" \ |
| 190 | " orr lr, ip, #128\n" \ |
| 191 | " msr cpsr_c, lr\n" \ |
| 192 | " ldr lr, [%0]\n" \ |
| 193 | " adds lr, lr, %1\n" \ |
| 194 | " str lr, [%0]\n" \ |
| 195 | " msr cpsr_c, ip\n" \ |
| 196 | " movle ip, %0\n" \ |
| 197 | " blle " #wake \ |
| 198 | : \ |
| 199 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 200 | : "ip", "lr", "cc"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | }) |
| 202 | |
| 203 | /* |
| 204 | * The value 0x01000000 supports up to 128 processors and |
| 205 | * lots of processes. BIAS must be chosen such that sub'ing |
| 206 | * BIAS once per CPU will result in the long remaining |
| 207 | * negative. |
| 208 | */ |
| 209 | #define RW_LOCK_BIAS 0x01000000 |
| 210 | #define RW_LOCK_BIAS_STR "0x01000000" |
| 211 | |
| 212 | #define __down_op_write(ptr,fail) \ |
| 213 | ({ \ |
| 214 | __asm__ __volatile__( \ |
| 215 | "@ down_op_write\n" \ |
| 216 | " mrs ip, cpsr\n" \ |
| 217 | " orr lr, ip, #128\n" \ |
| 218 | " msr cpsr_c, lr\n" \ |
| 219 | " ldr lr, [%0]\n" \ |
| 220 | " subs lr, lr, %1\n" \ |
| 221 | " str lr, [%0]\n" \ |
| 222 | " msr cpsr_c, ip\n" \ |
| 223 | " movne ip, %0\n" \ |
| 224 | " blne " #fail \ |
| 225 | : \ |
| 226 | : "r" (ptr), "I" (RW_LOCK_BIAS) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 227 | : "ip", "lr", "cc"); \ |
| 228 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | }) |
| 230 | |
| 231 | #define __up_op_write(ptr,wake) \ |
| 232 | ({ \ |
| 233 | __asm__ __volatile__( \ |
Nicolas Pitre | 9b15c6c | 2005-10-18 07:51:34 +0100 | [diff] [blame^] | 234 | "@ up_op_write\n" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | " mrs ip, cpsr\n" \ |
| 236 | " orr lr, ip, #128\n" \ |
| 237 | " msr cpsr_c, lr\n" \ |
| 238 | " ldr lr, [%0]\n" \ |
| 239 | " adds lr, lr, %1\n" \ |
| 240 | " str lr, [%0]\n" \ |
| 241 | " msr cpsr_c, ip\n" \ |
| 242 | " movcs ip, %0\n" \ |
| 243 | " blcs " #wake \ |
| 244 | : \ |
| 245 | : "r" (ptr), "I" (RW_LOCK_BIAS) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 246 | : "ip", "lr", "cc"); \ |
| 247 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | }) |
| 249 | |
| 250 | #define __down_op_read(ptr,fail) \ |
| 251 | __down_op(ptr, fail) |
| 252 | |
| 253 | #define __up_op_read(ptr,wake) \ |
| 254 | ({ \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 255 | smp_mb(); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | __asm__ __volatile__( \ |
| 257 | "@ up_op_read\n" \ |
| 258 | " mrs ip, cpsr\n" \ |
| 259 | " orr lr, ip, #128\n" \ |
| 260 | " msr cpsr_c, lr\n" \ |
| 261 | " ldr lr, [%0]\n" \ |
| 262 | " adds lr, lr, %1\n" \ |
| 263 | " str lr, [%0]\n" \ |
| 264 | " msr cpsr_c, ip\n" \ |
| 265 | " moveq ip, %0\n" \ |
| 266 | " bleq " #wake \ |
| 267 | : \ |
| 268 | : "r" (ptr), "I" (1) \ |
Russell King | 6d9b37a | 2005-07-26 19:44:26 +0100 | [diff] [blame] | 269 | : "ip", "lr", "cc"); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | }) |
| 271 | |
| 272 | #endif |
| 273 | |
| 274 | #endif |