[MINIOS] Refactor spinlock header for multi-arch support.

I separated the spinlock parts special to the x86 architecture and
moved these to include/x86/arch_spinlock.h. The common code is now in
include/spinlock.h.

Signed-off-by: Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/extras/mini-os/include/spinlock.h b/extras/mini-os/include/spinlock.h
new file mode 100644
index 0000000000..ecfe73627e
--- /dev/null
+++ b/extras/mini-os/include/spinlock.h
@@ -0,0 +1,55 @@
+#ifndef __ASM_SPINLOCK_H
+#define __ASM_SPINLOCK_H
+
+#include <lib.h>
+
+/*
+ * Your basic SMP spinlocks, allowing only a single CPU anywhere
+ */
+
+typedef struct {
+	volatile unsigned int slock;
+} spinlock_t;
+
+
+#include "arch_spinlock.h"
+
+
+#define SPINLOCK_MAGIC	0xdead4ead
+
+#define SPIN_LOCK_UNLOCKED ARCH_SPIN_LOCK_UNLOCKED
+
+#define spin_lock_init(x)	do { *(x) = SPIN_LOCK_UNLOCKED; } while(0)
+
+/*
+ * Simple spin lock operations.  There are two variants, one clears IRQ's
+ * on the local processor, one does not.
+ *
+ * We make no fairness assumptions. They have a cost.
+ */
+
+#define spin_is_locked(x)	arch_spin_is_locked(x)
+
+#define spin_unlock_wait(x)	do { barrier(); } while(spin_is_locked(x))
+
+
+#define _spin_trylock(lock)     ({_raw_spin_trylock(lock) ? \
+                                1 : ({ 0;});})
+
+#define _spin_lock(lock)        \
+do {                            \
+        _raw_spin_lock(lock);   \
+} while(0)
+
+#define _spin_unlock(lock)      \
+do {                            \
+        _raw_spin_unlock(lock); \
+} while (0)
+
+
+#define spin_lock(lock)       _spin_lock(lock)
+#define spin_unlock(lock)       _spin_unlock(lock)
+
+#define DEFINE_SPINLOCK(x) spinlock_t x = SPIN_LOCK_UNLOCKED
+
+#endif