From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754588AbeCRTwq (ORCPT ); Sun, 18 Mar 2018 15:52:46 -0400 Received: from smtp2200-217.mail.aliyun.com ([121.197.200.217]:53809 "EHLO smtp2200-217.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754549AbeCRTwk (ORCPT ); Sun, 18 Mar 2018 15:52:40 -0400 X-Alimail-AntiSpam: AC=CONTINUE;BC=0.1509042|-1;CH=green;FP=0|0|0|0|0|-1|-1|-1;HT=e02c03290;MF=ren_guo@c-sky.com;NM=1;PH=DS;RN=11;RT=11;SR=0;TI=SMTPD_---.BMC0lr5_1521402717; From: Guo Ren To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, daniel.lezcano@linaro.org, jason@lakedaemon.net, arnd@arndb.de Cc: c-sky_gcc_upstream@c-sky.com, gnu-csky@mentor.com, thomas.petazzoni@bootlin.com, wbx@uclibc-ng.org, Guo Ren Subject: [PATCH 07/19] csky: Atomic operations Date: Mon, 19 Mar 2018 03:51:29 +0800 Message-Id: <3bb374397444cd5a700efe1f5741e7e80d4650e7.1521399976.git.ren_guo@c-sky.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Guo Ren --- arch/csky/kernel/atomic.S | 55 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 arch/csky/kernel/atomic.S diff --git a/arch/csky/kernel/atomic.S b/arch/csky/kernel/atomic.S new file mode 100644 index 0000000..e6e9fd2 --- /dev/null +++ b/arch/csky/kernel/atomic.S @@ -0,0 +1,55 @@ +// 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 + 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, 0) +1: + rts +END(csky_cmpxchg_fixup) + -- 2.7.4