Provide some gcc-builtin atomic ops.
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
---
lib/asm-generic/atomic.h | 21 +++++++++++++++++++++
lib/x86/atomic.h | 2 ++
2 files changed, 23 insertions(+)
create mode 100644 lib/asm-generic/atomic.h
diff --git a/lib/asm-generic/atomic.h b/lib/asm-generic/atomic.h
new file mode 100644
index 0000000..26b645a
--- /dev/null
+++ b/lib/asm-generic/atomic.h
@@ -0,0 +1,21 @@
+#ifndef __ASM_GENERIC_ATOMIC_H__
+#define __ASM_GENERIC_ATOMIC_H__
+
+/* From QEMU include/qemu/atomic.h */
+#define atomic_fetch_inc(ptr) __sync_fetch_and_add(ptr, 1)
+#define atomic_fetch_dec(ptr) __sync_fetch_and_add(ptr, -1)
+#define atomic_fetch_add(ptr, n) __sync_fetch_and_add(ptr, n)
+#define atomic_fetch_sub(ptr, n) __sync_fetch_and_sub(ptr, n)
+#define atomic_fetch_and(ptr, n) __sync_fetch_and_and(ptr, n)
+#define atomic_fetch_or(ptr, n) __sync_fetch_and_or(ptr, n)
+#define atomic_fetch_xor(ptr, n) __sync_fetch_and_xor(ptr, n)
+
+#define atomic_inc_fetch(ptr) __sync_add_and_fetch(ptr, 1)
+#define atomic_dec_fetch(ptr) __sync_add_and_fetch(ptr, -1)
+#define atomic_add_fetch(ptr, n) __sync_add_and_fetch(ptr, n)
+#define atomic_sub_fetch(ptr, n) __sync_sub_and_fetch(ptr, n)
+#define atomic_and_fetch(ptr, n) __sync_and_and_fetch(ptr, n)
+#define atomic_or_fetch(ptr, n) __sync_or_and_fetch(ptr, n)
+#define atomic_xor_fetch(ptr, n) __sync_xor_and_fetch(ptr, n)
+
+#endif
diff --git a/lib/x86/atomic.h b/lib/x86/atomic.h
index de2f033..c9ce489 100644
--- a/lib/x86/atomic.h
+++ b/lib/x86/atomic.h
@@ -1,6 +1,8 @@
#ifndef __ATOMIC_H
#define __ATOMIC_H
+#include "asm-generic/atomic.h"
+
typedef struct {
volatile int counter;
} atomic_t;
--
2.7.4
--
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