From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/csky/kernel/atomic.S | 61 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 arch/csky/kernel/atomic.S (limited to 'arch/csky/kernel/atomic.S') diff --git a/arch/csky/kernel/atomic.S b/arch/csky/kernel/atomic.S new file mode 100644 index 000000000..e73e548f7 --- /dev/null +++ b/arch/csky/kernel/atomic.S @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include +#include + +.text + +/* + * int csky_cmpxchg(int oldval, int newval, int *ptr) + * + * If *ptr != oldval && return 1, + * else *ptr = newval return 0. + */ +ENTRY(csky_cmpxchg) + USPTOKSP + + RD_MEH a3 + WR_MEH a3 + + mfcr a3, epc + addi a3, TRAP0_SIZE + + subi sp, 16 + stw a3, (sp, 0) + mfcr a3, epsr + stw a3, (sp, 4) + mfcr a3, usp + stw a3, (sp, 8) + + psrset ee +#ifdef CONFIG_CPU_HAS_LDSTEX +1: + ldex a3, (a2) + cmpne a0, a3 + bt16 2f + mov a3, a1 + stex a3, (a2) + bez a3, 1b +2: + sync.is +#else +GLOBAL(csky_cmpxchg_ldw) + ldw a3, (a2) + cmpne a0, a3 + bt16 3f +GLOBAL(csky_cmpxchg_stw) + stw a1, (a2) +3: +#endif + mvc a0 + ldw a3, (sp, 0) + mtcr a3, epc + ldw a3, (sp, 4) + mtcr a3, epsr + ldw a3, (sp, 8) + mtcr a3, usp + addi sp, 16 + KSPTOUSP + rte +END(csky_cmpxchg) -- cgit v1.2.3