1 files changed, 121 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h
new file mode 100644
index 0000000..6bc7208
--- /dev/null
+++ b/arch/blackfin/include/asm/system.h
@@ -0,0 +1,121 @@
+/*
+ * U-boot - system.h
+ *
+ * Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifndef _BLACKFIN_SYSTEM_H
+#define _BLACKFIN_SYSTEM_H
+
+/*
+ * Interrupt configuring macros.
+ */
+
+extern int irq_flags;
+
+#define local_irq_enable() \
+	__asm__ __volatile__ ( \
+		"sti %0;" \
+		: \
+		: "d" (irq_flags) \
+	)
+
+#define local_irq_disable() \
+	do { \
+		int __tmp_dummy; \
+		__asm__ __volatile__ ( \
+			"cli %0;" \
+			: "=d" (__tmp_dummy) \
+		); \
+	} while (0)
+
+# define local_irq_save(x) \
+	__asm__ __volatile__ ( \
+		"cli %0;" \
+		: "=&d" (x) \
+	)
+
+#define local_save_flags(x) \
+	__asm__ __volatile__ ( \
+		"cli %0;" \
+		"sti %0;" \
+		: "=d" (x) \
+	)
+
+#define irqs_enabled_from_flags(x) ((x) != 0x1f)
+
+#define local_irq_restore(x) \
+	do { \
+		if (irqs_enabled_from_flags(x)) \
+			local_irq_enable(); \
+	} while (0)
+
+/*
+ * Force strict CPU ordering.
+ */
+#define nop()			asm volatile ("nop;\n\t"::)
+#define mb()			asm volatile (""   : : :"memory")
+#define rmb()			asm volatile (""   : : :"memory")
+#define wmb()			asm volatile (""   : : :"memory")
+#define set_rmb(var, value)	do { xchg(&var, value); } while (0)
+#define set_mb(var, value)	set_rmb(var, value)
+#define set_wmb(var, value)	do { var = value; wmb(); } while (0)
+
+#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
+
+struct __xchg_dummy {
+	unsigned long a[100];
+};
+#define __xg(x) ((volatile struct __xchg_dummy *)(x))
+
+static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
+				   int size)
+{
+	unsigned long tmp = 0;
+	unsigned long flags = 0;
+
+	local_irq_save(flags);
+
+	switch (size) {
+	case 1:
+		__asm__ __volatile__
+			("%0 = b%2 (z);\n\t"
+			 "b%2 = %1;\n\t"
+			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	case 2:
+		__asm__ __volatile__
+			("%0 = w%2 (z);\n\t"
+			 "w%2 = %1;\n\t"
+			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	case 4:
+		__asm__ __volatile__
+			("%0 = %2;\n\t"
+			 "%2 = %1;\n\t"
+			 : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory");
+		break;
+	}
+	local_irq_restore(flags);
+	return tmp;
+}
+
+#endif	/* _BLACKFIN_SYSTEM_H */