x86/atomic: add xor operations

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/x86/machine/atomic.h b/arch/x86/machine/atomic.h
index 3fe3ade9..3b2ede51 100644
--- a/arch/x86/machine/atomic.h
+++ b/arch/x86/machine/atomic.h
@@ -42,6 +42,11 @@
                  : "+m" (*(ptr))    \
                  : "r" (bits))
 
+#define ATOMIC_XOR(ptr, bits)        \
+    asm volatile("lock xor %1, %0"   \
+                 : "+m" (*(ptr))    \
+                 : "r" (bits))
+
 /* The xchg instruction doesn't need a lock prefix */
 #define ATOMIC_SWAP(ptr, oldval, newval)        \
     asm volatile("xchg %1, %0"                  \
@@ -85,6 +90,12 @@ atomic_or_uint(volatile unsigned int *ptr, unsigned int bits)
     ATOMIC_OR(ptr, bits);
 }
 
+static inline void
+atomic_xor_uint(volatile unsigned int *ptr, unsigned int bits)
+{
+    ATOMIC_XOR(ptr, bits);
+}
+
 /*
  * Implies a full memory barrier.
  */
@@ -140,6 +151,12 @@ atomic_or_ulong(volatile unsigned long *ptr, unsigned long bits)
     ATOMIC_OR(ptr, bits);
 }
 
+static inline void
+atomic_xor_ulong(volatile unsigned long *ptr, unsigned long bits)
+{
+    ATOMIC_XOR(ptr, bits);
+}
+
 /*
  * Implies a full memory barrier.
  */