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OpenCloudOS-Kernel/arch/csky/kernel/atomic.S

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csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
/* 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.
*/
ENTRY(csky_cmpxchg)
USPTOKSP
mfcr a3, epc
csky: Reconstruct signal processing Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
2019-04-01 19:06:09 +08:00
addi a3, TRAP0_SIZE
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
tkernel: add base tlinux kernel interfaces Sync kernel codes to the same with 590eaf1fec75 ("Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces."), which is from tk4, and it is the base of tk4. Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
2024-06-11 20:08:33 +08:00
subi sp, 16
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
stw a3, (sp, 0)
mfcr a3, epsr
stw a3, (sp, 4)
tkernel: add base tlinux kernel interfaces Sync kernel codes to the same with 590eaf1fec75 ("Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces."), which is from tk4, and it is the base of tk4. Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
2024-06-11 20:08:33 +08:00
mfcr a3, usp
stw a3, (sp, 8)
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
psrset ee
csky: Reconstruct signal processing Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
2019-04-01 19:06:09 +08:00
#ifdef CONFIG_CPU_HAS_LDSTEX
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
1:
ldex a3, (a2)
cmpne a0, a3
bt16 2f
mov a3, a1
stex a3, (a2)
bez a3, 1b
2:
sync.is
#else
1:
ldw a3, (a2)
cmpne a0, a3
bt16 3f
2:
stw a1, (a2)
3:
csky: Reconstruct signal processing Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
2019-04-01 19:06:09 +08:00
#endif
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
mvc a0
ldw a3, (sp, 0)
mtcr a3, epc
ldw a3, (sp, 4)
mtcr a3, epsr
tkernel: add base tlinux kernel interfaces Sync kernel codes to the same with 590eaf1fec75 ("Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces."), which is from tk4, and it is the base of tk4. Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
2024-06-11 20:08:33 +08:00
ldw a3, (sp, 8)
mtcr a3, usp
addi sp, 16
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
KSPTOUSP
rte
END(csky_cmpxchg)
csky: Reconstruct signal processing Linux kernel has provided some apis for arch signal's implementation. For example: restore_saved_sigmask() set_current_blocked() restore_altstack() But in last version of csky signal.c didn't use them and some codes are confusing, so reconstruct signal.c with reference to riscv's code. Now csky signal.c implementation are very close to riscv and we can get the following benefits: - Clear code structure - The signal code of riscv and csky can be reviewed together - Promoting the unification of arch's signal implementation Also modified the related code in entry.S Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
2019-04-01 19:06:09 +08:00
#ifndef CONFIG_CPU_HAS_LDSTEX
csky: Atomic operations 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>
2018-09-05 14:25:16 +08:00
/*
* 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