From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/mn10300/include/asm/rwlock.h | 125 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 arch/mn10300/include/asm/rwlock.h

(limited to 'arch/mn10300/include/asm/rwlock.h')

diff --git a/arch/mn10300/include/asm/rwlock.h b/arch/mn10300/include/asm/rwlock.h
new file mode 100644
index 000000000..6d594d4a0
--- /dev/null
+++ b/arch/mn10300/include/asm/rwlock.h
@@ -0,0 +1,125 @@
+/*
+ * Helpers used by both rw spinlocks and rw semaphores.
+ *
+ * Based in part on code from semaphore.h and
+ * spinlock.h Copyright 1996 Linus Torvalds.
+ *
+ * Copyright 1999 Red Hat, Inc.
+ *
+ * Written by Benjamin LaHaise.
+ *
+ * Modified by Matsushita Electric Industrial Co., Ltd.
+ * Modifications:
+ * 13-Nov-2006 MEI Temporarily delete lock functions for SMP support.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+#ifndef _ASM_RWLOCK_H
+#define _ASM_RWLOCK_H
+
+#define RW_LOCK_BIAS		 0x01000000
+
+#ifndef CONFIG_SMP
+
+typedef struct { unsigned long a[100]; } __dummy_lock_t;
+#define __dummy_lock(lock) (*(__dummy_lock_t *)(lock))
+
+#define RW_LOCK_BIAS_STR	"0x01000000"
+
+#define __build_read_lock_ptr(rw, helper)				\
+	do {								\
+		asm volatile(						\
+			"	mov	(%0),d3			\n"	\
+			"	sub	1,d3			\n"	\
+			"	mov	d3,(%0)			\n"	\
+			"	blt	1f			\n"	\
+			"	bra	2f			\n"	\
+			"1:	jmp	3f			\n"	\
+			"2:					\n"	\
+			"	.section .text.lock,\"ax\"	\n"	\
+			"3:	call	"helper"[],0		\n"	\
+			"	jmp	2b			\n"	\
+			"	.previous"				\
+			:						\
+			: "d" (rw)					\
+			: "memory", "d3", "cc");			\
+	} while (0)
+
+#define __build_read_lock_const(rw, helper)				\
+	do {								\
+		asm volatile(						\
+			"	mov	(%0),d3			\n"	\
+			"	sub	1,d3			\n"	\
+			"	mov	d3,(%0)			\n"	\
+			"	blt	1f			\n"	\
+			"	bra	2f			\n"	\
+			"1:	jmp	3f			\n"	\
+			"2:					\n"	\
+			"	.section .text.lock,\"ax\"	\n"	\
+			"3:	call	"helper"[],0		\n"	\
+			"	jmp	2b			\n"	\
+			"	.previous"				\
+			:						\
+			: "d" (rw)					\
+			: "memory", "d3", "cc");			\
+	} while (0)
+
+#define __build_read_lock(rw, helper) \
+	do {								\
+		if (__builtin_constant_p(rw))				\
+			__build_read_lock_const(rw, helper);		\
+		else							\
+			__build_read_lock_ptr(rw, helper);		\
+	} while (0)
+
+#define __build_write_lock_ptr(rw, helper)				\
+	do {								\
+		asm volatile(						\
+			"	mov	(%0),d3			\n"	\
+			"	sub	1,d3			\n"	\
+			"	mov	d3,(%0)			\n"	\
+			"	blt	1f			\n"	\
+			"	bra	2f			\n"	\
+			"1:	jmp	3f			\n"	\
+			"2:					\n"	\
+			"	.section .text.lock,\"ax\"	\n"	\
+			"3:	call	"helper"[],0		\n"	\
+			"	jmp	2b			\n"	\
+			"	.previous"				\
+			:						\
+			: "d" (rw)					\
+			: "memory", "d3", "cc");			\
+	} while (0)
+
+#define __build_write_lock_const(rw, helper)				\
+	do {								\
+		asm volatile(						\
+			"	mov	(%0),d3			\n"	\
+			"	sub	1,d3			\n"	\
+			"	mov	d3,(%0)			\n"	\
+			"	blt	1f			\n"	\
+			"	bra	2f			\n"	\
+			"1:	jmp	3f			\n"	\
+			"2:					\n"	\
+			"	.section .text.lock,\"ax\"	\n"	\
+			"3:	call	"helper"[],0		\n"	\
+			"	jmp	2b			\n"	\
+			"	.previous"				\
+			:						\
+			: "d" (rw)					\
+			: "memory", "d3", "cc");			\
+	} while (0)
+
+#define __build_write_lock(rw, helper)					\
+	do {								\
+		if (__builtin_constant_p(rw))				\
+			__build_write_lock_const(rw, helper);		\
+		else							\
+			__build_write_lock_ptr(rw, helper);		\
+	} while (0)
+
+#endif /* CONFIG_SMP */
+#endif /* _ASM_RWLOCK_H */
-- 
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