diff options
Diffstat (limited to 'include/asm-arm26/locks.h')
| -rw-r--r-- | include/asm-arm26/locks.h | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/include/asm-arm26/locks.h b/include/asm-arm26/locks.h deleted file mode 100644 index 81b3bda..0000000 --- a/include/asm-arm26/locks.h +++ /dev/null @@ -1,161 +0,0 @@ -/* - * linux/include/asm-arm/proc-armo/locks.h - * - * Copyright (C) 2000 Russell King - * Fixes for 26 bit machines, (C) 2000 Dave Gilbert - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Interrupt safe locking assembler. - */ -#ifndef __ASM_PROC_LOCKS_H -#define __ASM_PROC_LOCKS_H - -/* Decrements by 1, fails if value < 0 */ -#define __down_op(ptr,fail) \ - ({ \ - __asm__ __volatile__ ( \ - "@ atomic down operation\n" \ -" mov ip, pc\n" \ -" orr lr, ip, #0x08000000\n" \ -" teqp lr, #0\n" \ -" ldr lr, [%0]\n" \ -" and ip, ip, #0x0c000003\n" \ -" subs lr, lr, #1\n" \ -" str lr, [%0]\n" \ -" orrmi ip, ip, #0x80000000 @ set N\n" \ -" teqp ip, #0\n" \ -" movmi ip, %0\n" \ -" blmi " #fail \ - : \ - : "r" (ptr) \ - : "ip", "lr", "cc"); \ - }) - -#define __down_op_ret(ptr,fail) \ - ({ \ - unsigned int result; \ - __asm__ __volatile__ ( \ -" @ down_op_ret\n" \ -" mov ip, pc\n" \ -" orr lr, ip, #0x08000000\n" \ -" teqp lr, #0\n" \ -" ldr lr, [%1]\n" \ -" and ip, ip, #0x0c000003\n" \ -" subs lr, lr, #1\n" \ -" str lr, [%1]\n" \ -" orrmi ip, ip, #0x80000000 @ set N\n" \ -" teqp ip, #0\n" \ -" movmi ip, %1\n" \ -" movpl ip, #0\n" \ -" blmi " #fail "\n" \ -" mov %0, ip" \ - : "=&r" (result) \ - : "r" (ptr) \ - : "ip", "lr", "cc"); \ - result; \ - }) - -#define __up_op(ptr,wake) \ - ({ \ - __asm__ __volatile__ ( \ - "@ up_op\n" \ -" mov ip, pc\n" \ -" orr lr, ip, #0x08000000\n" \ -" teqp lr, #0\n" \ -" ldr lr, [%0]\n" \ -" and ip, ip, #0x0c000003\n" \ -" adds lr, lr, #1\n" \ -" str lr, [%0]\n" \ -" orrle ip, ip, #0x80000000 @ set N - should this be mi ??? DAG ! \n" \ -" teqp ip, #0\n" \ -" movmi ip, %0\n" \ -" blmi " #wake \ - : \ - : "r" (ptr) \ - : "ip", "lr", "cc"); \ - }) - -/* - * The value 0x01000000 supports up to 128 processors and - * lots of processes. BIAS must be chosen such that sub'ing - * BIAS once per CPU will result in the long remaining - * negative. - */ -#define RW_LOCK_BIAS 0x01000000 -#define RW_LOCK_BIAS_STR "0x01000000" - -/* Decrements by RW_LOCK_BIAS rather than 1, fails if value != 0 */ -#define __down_op_write(ptr,fail) \ - ({ \ - __asm__ __volatile__( \ - "@ down_op_write\n" \ -" mov ip, pc\n" \ -" orr lr, ip, #0x08000000\n" \ -" teqp lr, #0\n" \ -" and ip, ip, #0x0c000003\n" \ -\ -" ldr lr, [%0]\n" \ -" subs lr, lr, %1\n" \ -" str lr, [%0]\n" \ -\ -" orreq ip, ip, #0x40000000 @ set Z \n"\ -" teqp ip, #0\n" \ -" movne ip, %0\n" \ -" blne " #fail \ - : \ - : "r" (ptr), "I" (RW_LOCK_BIAS) \ - : "ip", "lr", "cc"); \ - }) - -/* Increments by RW_LOCK_BIAS, wakes if value >= 0 */ -#define __up_op_write(ptr,wake) \ - ({ \ - __asm__ __volatile__( \ - "@ up_op_read\n" \ -" mov ip, pc\n" \ -" orr lr, ip, #0x08000000\n" \ -" teqp lr, #0\n" \ -\ -" ldr lr, [%0]\n" \ -" and ip, ip, #0x0c000003\n" \ -" adds lr, lr, %1\n" \ -" str lr, [%0]\n" \ -\ -" orrcs ip, ip, #0x20000000 @ set C\n" \ -" teqp ip, #0\n" \ -" movcs ip, %0\n" \ -" blcs " #wake \ - : \ - : "r" (ptr), "I" (RW_LOCK_BIAS) \ - : "ip", "lr", "cc"); \ - }) - -#define __down_op_read(ptr,fail) \ - __down_op(ptr, fail) - -#define __up_op_read(ptr,wake) \ - ({ \ - __asm__ __volatile__( \ - "@ up_op_read\n" \ -" mov ip, pc\n" \ -" orr lr, ip, #0x08000000\n" \ -" teqp lr, #0\n" \ -\ -" ldr lr, [%0]\n" \ -" and ip, ip, #0x0c000003\n" \ -" adds lr, lr, %1\n" \ -" str lr, [%0]\n" \ -\ -" orreq ip, ip, #0x40000000 @ Set Z \n" \ -" teqp ip, #0\n" \ -" moveq ip, %0\n" \ -" bleq " #wake \ - : \ - : "r" (ptr), "I" (1) \ - : "ip", "lr", "cc"); \ - }) - -#endif |
