You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
161 lines
3.6 KiB
161 lines
3.6 KiB
/*
|
|
* 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
|
|
|