1 files changed, 113 insertions, 0 deletions
diff --git a/include/asm-v850/system.h b/include/asm-v850/system.h
new file mode 100644
index 0000000..20f4c73
--- /dev/null
+++ b/include/asm-v850/system.h
@@ -0,0 +1,113 @@
+/*
+ * include/asm-v850/system.h -- Low-level interrupt/thread ops
+ *
+ *  Copyright (C) 2001,02,03  NEC Electronics Corporation
+ *  Copyright (C) 2001,02,03  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>
+ */
+
+#ifndef __V850_SYSTEM_H__
+#define __V850_SYSTEM_H__
+
+#include <linux/linkage.h>
+#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 local_irq_enable()	__asm__ __volatile__ ("ei")
+#define local_irq_disable()	__asm__ __volatile__ ("di")
+
+#define local_save_flags(flags) \
+  __asm__ __volatile__ ("stsr %1, %0" : "=r" (flags) : "i" (SR_PSW))
+#define local_restore_flags(flags) \
+  __asm__ __volatile__ ("ldsr %0, %1" :: "r" (flags), "i" (SR_PSW))
+
+/* For spinlocks etc */
+#define	local_irq_save(flags) \
+  do { local_save_flags (flags); local_irq_disable (); } while (0) 
+#define local_irq_restore(flags) \
+  local_restore_flags (flags);
+
+
+static inline int irqs_disabled (void)
+{
+	unsigned flags;
+	local_save_flags (flags);
+	return !!(flags & 0x20);
+}
+
+
+/*
+ * Force strict CPU ordering.
+ * Not really required on v850...
+ */
+#define nop()			__asm__ __volatile__ ("nop")
+#define mb()			__asm__ __volatile__ ("" ::: "memory")
+#define rmb()			mb ()
+#define wmb()			mb ()
+#define read_barrier_depends()	((void)0)
+#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 smp_mb()	mb ()
+#define smp_rmb()	rmb ()
+#define smp_wmb()	wmb ()
+#define smp_read_barrier_depends()	read_barrier_depends()
+
+#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;
+
+	local_irq_save (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;
+	}
+
+	local_irq_restore (flags);
+
+	return tmp;
+}
+
+#define arch_align_stack(x) (x)
+
+#endif /* __V850_SYSTEM_H__ */