Linux SNPS ARC Archive on lore.kernel.org
 help / color / Atom feed
From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: libc-alpha@sourceware.org
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>,
	linux-snps-arc@lists.infradead.org,
	Adhemerval Zanella <adhemerval.zanella@linaro.org>
Subject: [COMMITTED 04/13] ARC: Atomics and Locking primitives
Date: Fri, 10 Jul 2020 16:38:01 -0700
Message-ID: <20200710233810.18720-4-vgupta@synopsys.com> (raw)
In-Reply-To: <20200710233810.18720-1-vgupta@synopsys.com>

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
---
 sysdeps/arc/atomic-machine.h | 69 ++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 sysdeps/arc/atomic-machine.h

diff --git a/sysdeps/arc/atomic-machine.h b/sysdeps/arc/atomic-machine.h
new file mode 100644
index 000000000000..1c8638bb44ef
--- /dev/null
+++ b/sysdeps/arc/atomic-machine.h
@@ -0,0 +1,69 @@
+/* Low-level functions for atomic operations. ARC version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _ARC_BITS_ATOMIC_H
+#define _ARC_BITS_ATOMIC_H 1
+
+#include <stdint.h>
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+typedef int_fast32_t atomic_fast32_t;
+typedef uint_fast32_t uatomic_fast32_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+#define __HAVE_64B_ATOMICS 0
+#define USE_ATOMIC_COMPILER_BUILTINS 1
+
+/* ARC does have legacy atomic EX reg, [mem] instruction but the micro-arch
+   is not as optimal as LLOCK/SCOND specially for SMP.  */
+#define ATOMIC_EXCHANGE_USES_CAS 1
+
+#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval)	\
+  (abort (), 0)
+#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval)	\
+  (abort (), 0)
+#define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval)	\
+  (abort (), 0)
+
+#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model)	\
+  (abort (), (__typeof (*mem)) 0)
+#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model)	\
+  (abort (), (__typeof (*mem)) 0)
+#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model)	\
+  (abort (), (__typeof (*mem)) 0)
+
+#define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model)	\
+  ({										\
+    typeof (*mem) __oldval = (oldval);                                  	\
+    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0,    	\
+                                 model, __ATOMIC_RELAXED);              	\
+    __oldval;                                                           	\
+  })
+
+#define atomic_compare_and_exchange_val_acq(mem, new, old)		\
+  __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
+		       mem, new, old, __ATOMIC_ACQUIRE)
+
+#define atomic_full_barrier()  ({ asm volatile ("dmb 3":::"memory"); })
+
+#endif /* _ARC_BITS_ATOMIC_H */
-- 
2.20.1


_______________________________________________
linux-snps-arc mailing list
linux-snps-arc@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-snps-arc

  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-10 23:37 [COMMITTED 01/13] ARC: ABI Implementation Vineet Gupta
2020-07-10 23:37 ` [COMMITTED 02/13] ARC: startup and dynamic linking code Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 03/13] ARC: Thread Local Storage support Vineet Gupta
2020-07-10 23:38 ` Vineet Gupta [this message]
2020-07-10 23:38 ` [COMMITTED 05/13] ARC: math soft float support Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 06/13] ARC: hardware floating point support Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 07/13] ARC: Linux Syscall Interface Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 08/13] ARC: Linux ABI Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 09/13] ARC: Linux Startup and Dynamic Loading Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 10/13] ARC: ABI lists Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 11/13] ARC: Build Infrastructure Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 12/13] build-many-glibcs.py: Enable ARC builds Vineet Gupta
2020-07-10 23:38 ` [COMMITTED 13/13] Documentation for ARC port Vineet Gupta

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200710233810.18720-4-vgupta@synopsys.com \
    --to=vineet.gupta1@synopsys.com \
    --cc=adhemerval.zanella@linaro.org \
    --cc=libc-alpha@sourceware.org \
    --cc=linux-snps-arc@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux SNPS ARC Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-snps-arc/0 linux-snps-arc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-snps-arc linux-snps-arc/ https://lore.kernel.org/linux-snps-arc \
		linux-snps-arc@lists.infradead.org
	public-inbox-index linux-snps-arc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-snps-arc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git