1 files changed, 70 insertions, 0 deletions

diff --git a/include/asm-i386/local.h b/include/asm-i386/local.h
new file mode 100644
index 000000000000..0177da80dde3
--- /dev/null
+++ b/include/asm-i386/local.h
@@ -0,0 +1,70 @@
+#ifndef _ARCH_I386_LOCAL_H
+#define _ARCH_I386_LOCAL_H
+
+#include <linux/percpu.h>
+
+typedef struct
+{
+        volatile unsigned long counter;
+} local_t;
+
+#define LOCAL_INIT(i)   { (i) }
+
+#define local_read(v)   ((v)->counter)
+#define local_set(v,i)  (((v)->counter) = (i))
+
+static __inline__ void local_inc(local_t *v)
+{
+        __asm__ __volatile__(
+                "incl %0"
+                :"=m" (v->counter)
+                :"m" (v->counter));
+}
+
+static __inline__ void local_dec(local_t *v)
+{
+        __asm__ __volatile__(
+                "decl %0"
+                :"=m" (v->counter)
+                :"m" (v->counter));
+}
+
+static __inline__ void local_add(unsigned long i, local_t *v)
+{
+        __asm__ __volatile__(
+                "addl %1,%0"
+                :"=m" (v->counter)
+                :"ir" (i), "m" (v->counter));
+}
+
+static __inline__ void local_sub(unsigned long i, local_t *v)
+{
+        __asm__ __volatile__(
+                "subl %1,%0"
+                :"=m" (v->counter)
+                :"ir" (i), "m" (v->counter));
+}
+
+/* On x86, these are no better than the atomic variants. */
+#define __local_inc(l)          local_inc(l)
+#define __local_dec(l)          local_dec(l)
+#define __local_add(i,l)        local_add((i),(l))
+#define __local_sub(i,l)        local_sub((i),(l))
+
+/* Use these for per-cpu local_t variables: on some archs they are
+ * much more efficient than these naive implementations.  Note they take
+ * a variable, not an address.
+ */
+#define cpu_local_read(v)       local_read(&__get_cpu_var(v))
+#define cpu_local_set(v, i)     local_set(&__get_cpu_var(v), (i))
+#define cpu_local_inc(v)        local_inc(&__get_cpu_var(v))
+#define cpu_local_dec(v)        local_dec(&__get_cpu_var(v))
+#define cpu_local_add(i, v)     local_add((i), &__get_cpu_var(v))
+#define cpu_local_sub(i, v)     local_sub((i), &__get_cpu_var(v))
+
+#define __cpu_local_inc(v)      cpu_local_inc(v)
+#define __cpu_local_dec(v)      cpu_local_dec(v)
+#define __cpu_local_add(i, v)   cpu_local_add((i), (v))
+#define __cpu_local_sub(i, v)   cpu_local_sub((i), (v))
+
+#endif /* _ARCH_I386_LOCAL_H */