Add machine/atomic.h to all architectures and define two operations

right now that are supposed to be atomic with respect to interrupts and
SMP: atomic_setbits_int and atomic_clearbits_int.

All architectures other than i386 and amd64 get dummy implementations
since at first we'll be replacing operations that are done with
"a |= bit" and "a &= ~bit" today. More proper implementations will follow

kettenis@, miod@ ok

1 files changed, 20 insertions, 0 deletions

diff --git a/sys/arch/arm/include/atomic.h b/sys/arch/arm/include/atomic.h
new file mode 100644
index 00000000000..8bf37567652
--- /dev/null
+++ b/sys/arch/arm/include/atomic.h
@@ -0,0 +1,20 @@
+/*	$OpenBSD: atomic.h,v 1.3 2007/02/06 17:13:33 art Exp $	*/
+
+/* Public Domain */
+
+#ifndef __ARM_ATOMIC_H__
+#define __ARM_ATOMIC_H__
+
+static __inline void
+atomic_setbits_int(__volatile unsigned int *uip, unsigned int v)
+{
+	*uip |= v;
+}
+
+static __inline void
+atomic_clearbits_int(__volatile unsigned int *uip, unsigned int v)
+{
+	*uip &= ~v;
+}
+
+#endif