linux-kernel - [PATCH 4/6] openrisc: add atomic operations implementations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 24 Jul 2014 00:18:14 +0300
From:	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
To:	linux-kernel@...r.kernel.org, linux@...ts.openrisc.net
Cc:	jonas@...thpole.se,
	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
Subject: [PATCH 4/6] openrisc: add atomic operations implementations

Optimized version that make use of the l.lwa and l.swa instructions
if available.

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
---
 arch/openrisc/include/asm/Kbuild   |  1 -
 arch/openrisc/include/asm/atomic.h | 88 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+), 1 deletion(-)
 create mode 100644 arch/openrisc/include/asm/atomic.h

diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
index 013b64a..1e759d5 100644
--- a/arch/openrisc/include/asm/Kbuild
+++ b/arch/openrisc/include/asm/Kbuild
@@ -1,7 +1,6 @@
 
 header-y += ucontext.h
 
-generic-y += atomic.h
 generic-y += auxvec.h
 generic-y += barrier.h
 generic-y += bitsperlong.h
diff --git a/arch/openrisc/include/asm/atomic.h b/arch/openrisc/include/asm/atomic.h
new file mode 100644
index 0000000..253edcc
--- /dev/null
+++ b/arch/openrisc/include/asm/atomic.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef __ASM_OPENRISC_ATOMIC_H
+#define __ASM_OPENRISC_ATOMIC_H
+
+#include <linux/types.h>
+
+#ifdef CONFIG_OPENRISC_HAVE_INST_LWA_SWA
+
+static inline int atomic_add_return(int i, atomic_t *v)
+{
+	int tmp;
+
+	__asm__ __volatile__(
+		"1:	l.lwa	%0,0(%1)	\n"
+		"	l.add	%0,%0,%2	\n"
+		"	l.swa	0(%1),%0	\n"
+		"	l.bnf	1b		\n"
+		"	 l.nop			\n"
+		: "=&r"(tmp)
+		: "r"(&v->counter), "r"(i)
+		: "cc", "memory");
+
+	return tmp;
+}
+
+static inline int atomic_sub_return(int i, atomic_t *v)
+{
+	int tmp;
+
+	__asm__ __volatile__(
+		"1:	l.lwa	%0,0(%1)	\n"
+		"	l.sub	%0,%0,%2	\n"
+		"	l.swa	0(%1),%0	\n"
+		"	l.bnf	1b		\n"
+		"	 l.nop			\n"
+		: "=&r"(tmp)
+		: "r"(&v->counter), "r"(i)
+		: "cc", "memory");
+
+	return tmp;
+}
+
+static inline void atomic_clear_mask(unsigned long mask, atomic_t *v)
+{
+	unsigned long tmp;
+
+	__asm__ __volatile__(
+		"1:	l.lwa	%0,0(%1)	\n"
+		"	l.and	%0,%0,%2	\n"
+		"	l.swa	0(%1),%0	\n"
+		"	l.bnf	1b		\n"
+		"	 l.nop			\n"
+		: "=&r"(tmp)
+		: "r"(&v->counter), "r"(mask)
+		: "cc", "memory");
+}
+
+static inline void atomic_set_mask(unsigned long mask, atomic_t *v)
+{
+	unsigned long tmp;
+
+	__asm__ __volatile__(
+		"1:	l.lwa	%0,0(%1)	\n"
+		"	l.or	%0,%0,%2	\n"
+		"	l.swa	0(%1),%0	\n"
+		"	l.bnf	1b		\n"
+		"	 l.nop			\n"
+		: "=&r"(tmp)
+		: "r"(&v->counter), "r"(mask)
+		: "cc", "memory");
+}
+
+#define atomic_add_return	atomic_add_return
+#define atomic_sub_return	atomic_sub_return
+#define atomic_clear_mask	atomic_clear_mask
+#define atomic_set_mask		atomic_set_mask
+
+#endif
+#include <asm-generic/atomic.h>
+
+#endif /* __ASM_OPENRISC_ATOMIC_H */
-- 
1.8.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/