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-rw-r--r--arch/blackfin/include/asm/system.h121
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h
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+++ b/arch/blackfin/include/asm/system.h
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+/*
+ * 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 */