mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-19 17:14:40 +08:00
a0ae62806f
This patch adds atomic, cmpxchg, spinlock files. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Andrea Parri <andrea.parri@amarulasolutions.com> Cc: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Peter Zijlstra <peterz@infradead.org>
88 lines
1.2 KiB
ArmAsm
88 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
|
|
#include <linux/linkage.h>
|
|
#include <abi/entry.h>
|
|
|
|
.text
|
|
|
|
/*
|
|
* int csky_cmpxchg(int oldval, int newval, int *ptr)
|
|
*
|
|
* If *ptr != oldval && return 1,
|
|
* else *ptr = newval return 0.
|
|
*/
|
|
#ifdef CONFIG_CPU_HAS_LDSTEX
|
|
ENTRY(csky_cmpxchg)
|
|
USPTOKSP
|
|
mfcr a3, epc
|
|
INCTRAP a3
|
|
|
|
subi sp, 8
|
|
stw a3, (sp, 0)
|
|
mfcr a3, epsr
|
|
stw a3, (sp, 4)
|
|
|
|
psrset ee
|
|
1:
|
|
ldex a3, (a2)
|
|
cmpne a0, a3
|
|
bt16 2f
|
|
mov a3, a1
|
|
stex a3, (a2)
|
|
bez a3, 1b
|
|
2:
|
|
sync.is
|
|
mvc a0
|
|
ldw a3, (sp, 0)
|
|
mtcr a3, epc
|
|
ldw a3, (sp, 4)
|
|
mtcr a3, epsr
|
|
addi sp, 8
|
|
KSPTOUSP
|
|
rte
|
|
END(csky_cmpxchg)
|
|
#else
|
|
ENTRY(csky_cmpxchg)
|
|
USPTOKSP
|
|
mfcr a3, epc
|
|
INCTRAP a3
|
|
|
|
subi sp, 8
|
|
stw a3, (sp, 0)
|
|
mfcr a3, epsr
|
|
stw a3, (sp, 4)
|
|
|
|
psrset ee
|
|
1:
|
|
ldw a3, (a2)
|
|
cmpne a0, a3
|
|
bt16 3f
|
|
2:
|
|
stw a1, (a2)
|
|
3:
|
|
mvc a0
|
|
ldw a3, (sp, 0)
|
|
mtcr a3, epc
|
|
ldw a3, (sp, 4)
|
|
mtcr a3, epsr
|
|
addi sp, 8
|
|
KSPTOUSP
|
|
rte
|
|
END(csky_cmpxchg)
|
|
|
|
/*
|
|
* Called from tlbmodified exception
|
|
*/
|
|
ENTRY(csky_cmpxchg_fixup)
|
|
mfcr a0, epc
|
|
lrw a1, 2b
|
|
cmpne a1, a0
|
|
bt 1f
|
|
subi a1, (2b - 1b)
|
|
stw a1, (sp, LSAVE_PC)
|
|
1:
|
|
rts
|
|
END(csky_cmpxchg_fixup)
|
|
#endif
|