diff options
Diffstat (limited to 'include/asm-arm26/locks.h')
| -rw-r--r-- | include/asm-arm26/locks.h | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/include/asm-arm26/locks.h b/include/asm-arm26/locks.h new file mode 100644 index 000000000000..81b3bda2ed00 --- /dev/null +++ b/include/asm-arm26/locks.h | |||
| @@ -0,0 +1,161 @@ | |||
| 1 | /* | ||
| 2 | * linux/include/asm-arm/proc-armo/locks.h | ||
| 3 | * | ||
| 4 | * Copyright (C) 2000 Russell King | ||
| 5 | * Fixes for 26 bit machines, (C) 2000 Dave Gilbert | ||
| 6 | * | ||
| 7 | * This program is free software; you can redistribute it and/or modify | ||
| 8 | * it under the terms of the GNU General Public License version 2 as | ||
| 9 | * published by the Free Software Foundation. | ||
| 10 | * | ||
| 11 | * Interrupt safe locking assembler. | ||
| 12 | */ | ||
| 13 | #ifndef __ASM_PROC_LOCKS_H | ||
| 14 | #define __ASM_PROC_LOCKS_H | ||
| 15 | |||
| 16 | /* Decrements by 1, fails if value < 0 */ | ||
| 17 | #define __down_op(ptr,fail) \ | ||
| 18 | ({ \ | ||
| 19 | __asm__ __volatile__ ( \ | ||
| 20 | "@ atomic down operation\n" \ | ||
| 21 | " mov ip, pc\n" \ | ||
| 22 | " orr lr, ip, #0x08000000\n" \ | ||
| 23 | " teqp lr, #0\n" \ | ||
| 24 | " ldr lr, [%0]\n" \ | ||
| 25 | " and ip, ip, #0x0c000003\n" \ | ||
| 26 | " subs lr, lr, #1\n" \ | ||
| 27 | " str lr, [%0]\n" \ | ||
| 28 | " orrmi ip, ip, #0x80000000 @ set N\n" \ | ||
| 29 | " teqp ip, #0\n" \ | ||
| 30 | " movmi ip, %0\n" \ | ||
| 31 | " blmi " #fail \ | ||
| 32 | : \ | ||
| 33 | : "r" (ptr) \ | ||
| 34 | : "ip", "lr", "cc"); \ | ||
| 35 | }) | ||
| 36 | |||
| 37 | #define __down_op_ret(ptr,fail) \ | ||
| 38 | ({ \ | ||
| 39 | unsigned int result; \ | ||
| 40 | __asm__ __volatile__ ( \ | ||
| 41 | " @ down_op_ret\n" \ | ||
| 42 | " mov ip, pc\n" \ | ||
| 43 | " orr lr, ip, #0x08000000\n" \ | ||
| 44 | " teqp lr, #0\n" \ | ||
| 45 | " ldr lr, [%1]\n" \ | ||
| 46 | " and ip, ip, #0x0c000003\n" \ | ||
| 47 | " subs lr, lr, #1\n" \ | ||
| 48 | " str lr, [%1]\n" \ | ||
| 49 | " orrmi ip, ip, #0x80000000 @ set N\n" \ | ||
| 50 | " teqp ip, #0\n" \ | ||
| 51 | " movmi ip, %1\n" \ | ||
| 52 | " movpl ip, #0\n" \ | ||
| 53 | " blmi " #fail "\n" \ | ||
| 54 | " mov %0, ip" \ | ||
| 55 | : "=&r" (result) \ | ||
| 56 | : "r" (ptr) \ | ||
| 57 | : "ip", "lr", "cc"); \ | ||
| 58 | result; \ | ||
| 59 | }) | ||
| 60 | |||
| 61 | #define __up_op(ptr,wake) \ | ||
| 62 | ({ \ | ||
| 63 | __asm__ __volatile__ ( \ | ||
| 64 | "@ up_op\n" \ | ||
| 65 | " mov ip, pc\n" \ | ||
| 66 | " orr lr, ip, #0x08000000\n" \ | ||
| 67 | " teqp lr, #0\n" \ | ||
| 68 | " ldr lr, [%0]\n" \ | ||
| 69 | " and ip, ip, #0x0c000003\n" \ | ||
| 70 | " adds lr, lr, #1\n" \ | ||
| 71 | " str lr, [%0]\n" \ | ||
| 72 | " orrle ip, ip, #0x80000000 @ set N - should this be mi ??? DAG ! \n" \ | ||
| 73 | " teqp ip, #0\n" \ | ||
| 74 | " movmi ip, %0\n" \ | ||
| 75 | " blmi " #wake \ | ||
| 76 | : \ | ||
| 77 | : "r" (ptr) \ | ||
| 78 | : "ip", "lr", "cc"); \ | ||
| 79 | }) | ||
| 80 | |||
| 81 | /* | ||
| 82 | * The value 0x01000000 supports up to 128 processors and | ||
| 83 | * lots of processes. BIAS must be chosen such that sub'ing | ||
| 84 | * BIAS once per CPU will result in the long remaining | ||
| 85 | * negative. | ||
| 86 | */ | ||
| 87 | #define RW_LOCK_BIAS 0x01000000 | ||
| 88 | #define RW_LOCK_BIAS_STR "0x01000000" | ||
| 89 | |||
| 90 | /* Decrements by RW_LOCK_BIAS rather than 1, fails if value != 0 */ | ||
| 91 | #define __down_op_write(ptr,fail) \ | ||
| 92 | ({ \ | ||
| 93 | __asm__ __volatile__( \ | ||
| 94 | "@ down_op_write\n" \ | ||
| 95 | " mov ip, pc\n" \ | ||
| 96 | " orr lr, ip, #0x08000000\n" \ | ||
| 97 | " teqp lr, #0\n" \ | ||
| 98 | " and ip, ip, #0x0c000003\n" \ | ||
| 99 | \ | ||
| 100 | " ldr lr, [%0]\n" \ | ||
| 101 | " subs lr, lr, %1\n" \ | ||
| 102 | " str lr, [%0]\n" \ | ||
| 103 | \ | ||
| 104 | " orreq ip, ip, #0x40000000 @ set Z \n"\ | ||
| 105 | " teqp ip, #0\n" \ | ||
| 106 | " movne ip, %0\n" \ | ||
| 107 | " blne " #fail \ | ||
| 108 | : \ | ||
| 109 | : "r" (ptr), "I" (RW_LOCK_BIAS) \ | ||
| 110 | : "ip", "lr", "cc"); \ | ||
| 111 | }) | ||
| 112 | |||
| 113 | /* Increments by RW_LOCK_BIAS, wakes if value >= 0 */ | ||
| 114 | #define __up_op_write(ptr,wake) \ | ||
| 115 | ({ \ | ||
| 116 | __asm__ __volatile__( \ | ||
| 117 | "@ up_op_read\n" \ | ||
| 118 | " mov ip, pc\n" \ | ||
| 119 | " orr lr, ip, #0x08000000\n" \ | ||
| 120 | " teqp lr, #0\n" \ | ||
| 121 | \ | ||
| 122 | " ldr lr, [%0]\n" \ | ||
| 123 | " and ip, ip, #0x0c000003\n" \ | ||
| 124 | " adds lr, lr, %1\n" \ | ||
| 125 | " str lr, [%0]\n" \ | ||
| 126 | \ | ||
| 127 | " orrcs ip, ip, #0x20000000 @ set C\n" \ | ||
| 128 | " teqp ip, #0\n" \ | ||
| 129 | " movcs ip, %0\n" \ | ||
| 130 | " blcs " #wake \ | ||
| 131 | : \ | ||
| 132 | : "r" (ptr), "I" (RW_LOCK_BIAS) \ | ||
| 133 | : "ip", "lr", "cc"); \ | ||
| 134 | }) | ||
| 135 | |||
| 136 | #define __down_op_read(ptr,fail) \ | ||
| 137 | __down_op(ptr, fail) | ||
| 138 | |||
| 139 | #define __up_op_read(ptr,wake) \ | ||
| 140 | ({ \ | ||
| 141 | __asm__ __volatile__( \ | ||
| 142 | "@ up_op_read\n" \ | ||
| 143 | " mov ip, pc\n" \ | ||
| 144 | " orr lr, ip, #0x08000000\n" \ | ||
| 145 | " teqp lr, #0\n" \ | ||
| 146 | \ | ||
| 147 | " ldr lr, [%0]\n" \ | ||
| 148 | " and ip, ip, #0x0c000003\n" \ | ||
| 149 | " adds lr, lr, %1\n" \ | ||
| 150 | " str lr, [%0]\n" \ | ||
| 151 | \ | ||
| 152 | " orreq ip, ip, #0x40000000 @ Set Z \n" \ | ||
| 153 | " teqp ip, #0\n" \ | ||
| 154 | " moveq ip, %0\n" \ | ||
| 155 | " bleq " #wake \ | ||
| 156 | : \ | ||
| 157 | : "r" (ptr), "I" (1) \ | ||
| 158 | : "ip", "lr", "cc"); \ | ||
| 159 | }) | ||
| 160 | |||
| 161 | #endif | ||