* Patch by Yasushi Shoji, 07 Apr 2004:

  - add support for microblaze processors
  - add support for AtmarkTechno "suzaku" board

1 files changed, 161 insertions, 0 deletions

diff --git a/include/asm-microblaze/system.h b/include/asm-microblaze/system.h
new file mode 100644
index 0000000..0297a11
--- /dev/null
+++ b/include/asm-microblaze/system.h
@@ -0,0 +1,161 @@
+/*
+ * include/asm-microblaze/system.h -- Low-level interrupt/thread ops
+ *
+ *  Copyright (C) 2003	John Williams (jwilliams@itee.uq.edu.au)
+ *			based upon microblaze version
+ *  Copyright (C) 2001	NEC Corporation
+ *  Copyright (C) 2001	Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ * Microblaze port by John Williams
+ * Microblaze port by John Williams
+ */
+
+#ifndef __MICROBLAZE_SYSTEM_H__
+#define __MICROBLAZE_SYSTEM_H__
+
+#if 0
+#include <linux/linkage.h>
+#endif
+#include <asm/ptrace.h>
+
+#define prepare_to_switch()	do { } while (0)
+
+/*
+ * switch_to(n) should switch tasks to task ptr, first checking that
+ * ptr isn't the current task, in which case it does nothing.
+ */
+struct thread_struct;
+extern void *switch_thread (struct thread_struct *last,
+			    struct thread_struct *next);
+#define switch_to(prev,next,last) do {					\
+	if (prev != next) {						\
+		(last) = switch_thread (&prev->thread, &next->thread);	\
+	}								\
+} while (0)
+
+
+/* Enable/disable interrupts.  */
+#define __sti() \
+{								\
+	register unsigned tmp;					\
+	__asm__ __volatile__ ("					\
+			mfs	%0, rmsr;			\
+			ori	%0, %0, 2;			\
+			mts	rmsr, %0"			\
+			: "=r" (tmp)				\
+			:					\
+			: "memory");				\
+}
+
+#define __cli() \
+{								\
+	register unsigned tmp;					\
+	__asm__ __volatile__ ("					\
+			mfs	%0, rmsr;			\
+			andi	%0, %0, ~2;			\
+			mts	rmsr, %0"			\
+			: "=r" (tmp)				\
+			:					\
+			: "memory");				\
+}
+
+#define __save_flags(flags) \
+	__asm__ __volatile__ ("mfs	%0, rmsr" : "=r" (flags))
+#define __restore_flags(flags) \
+	__asm__ __volatile__ ("mts	rmsr, %0" :: "r" (flags))
+
+#define __save_flags_cli(flags) \
+{								\
+	register unsigned tmp;					\
+	__asm__ __volatile__ ("					\
+			mfs	%0, rmsr;			\
+			andi	%1, %0, ~2;			\
+			mts	rmsr, %1;"			\
+			: "=r" (flags), "=r" (tmp)		\
+			:					\
+			: "memory");				\
+}
+
+#define __save_flags_sti(flags)					\
+{								\
+	register unsigned tmp;					\
+	__asm__ __volatile__ ("					\
+			mfs	%0, rmsr;			\
+			ori	%1, %0, 2;			\
+			mts	rmsr, %1;"			\
+			: "=r" (flags) ,"=r" (tmp)		\
+			:					\
+			: "memory");				\
+}
+
+/* For spinlocks etc */
+#define local_irq_save(flags)	__save_flags_cli (flags)
+#define local_irq_set(flags)	__save_flags_sti (flags)
+#define local_irq_restore(flags) __restore_flags (flags)
+#define local_irq_disable()	__cli ()
+#define local_irq_enable()	__sti ()
+
+#define cli()			__cli ()
+#define sti()			__sti ()
+#define save_flags(flags)	__save_flags (flags)
+#define restore_flags(flags)	__restore_flags (flags)
+#define save_flags_cli(flags)	__save_flags_cli (flags)
+
+/*
+ * Force strict CPU ordering.
+ * Not really required on microblaze...
+ */
+#define nop()			__asm__ __volatile__ ("nop")
+#define mb()			__asm__ __volatile__ ("nop" ::: "memory")
+#define rmb()			mb ()
+#define wmb()			mb ()
+#define set_mb(var, value)	do { var = value; mb(); } while (0)
+#define set_wmb(var, value)	do { var = value; wmb (); } while (0)
+
+#ifdef CONFIG_SMP
+#define smp_mb()	mb ()
+#define smp_rmb()	rmb ()
+#define smp_wmb()	wmb ()
+#else
+#define smp_mb()	barrier ()
+#define smp_rmb()	barrier ()
+#define smp_wmb()	barrier ()
+#endif
+
+#define xchg(ptr, with) \
+  ((__typeof__ (*(ptr)))__xchg ((unsigned long)(with), (ptr), sizeof (*(ptr))))
+#define tas(ptr) (xchg ((ptr), 1))
+
+extern inline unsigned long __xchg (unsigned long with,
+				    __volatile__ void *ptr, int size)
+{
+	unsigned long tmp, flags;
+
+	save_flags_cli (flags);
+
+	switch (size) {
+	case 1:
+		tmp = *(unsigned char *)ptr;
+		*(unsigned char *)ptr = with;
+		break;
+	case 2:
+		tmp = *(unsigned short *)ptr;
+		*(unsigned short *)ptr = with;
+		break;
+	case 4:
+		tmp = *(unsigned long *)ptr;
+		*(unsigned long *)ptr = with;
+		break;
+	}
+
+	restore_flags (flags);
+
+	return tmp;
+}
+
+#endif /* __MICROBLAZE_SYSTEM_H__ */