1 files changed, 108 insertions, 0 deletions
diff --git a/sys/linux/i386/arch/atomic.h b/sys/linux/i386/arch/atomic.h
new file mode 100644
index 0000000..eab161d
--- /dev/null
+++ b/sys/linux/i386/arch/atomic.h
@@ -0,0 +1,108 @@
+static inline int
+atomic·cas(volatile int *p, int t, int s)
+{
+	__asm__ __volatile__ (
+		"lock ; cmpxchg %3, %1"
+		: "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
+	return t;
+}
+
+static inline int
+atomic·swap(volatile int *p, int v)
+{
+	__asm__ __volatile__(
+		"xchg %0, %1"
+		: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
+	return v;
+}
+
+static inline int
+atomic·fetchadd(volatile int *p, int v)
+{
+	__asm__ __volatile__(
+		"lock ; xadd %0, %1"
+		: "=r"(v), "=m"(*p) : "0"(v) : "memory" );
+	return v;
+}
+
+static inline void
+atomic·and(volatile int *p, int v)
+{
+	__asm__ __volatile__(
+		"lock ; and %1, %0"
+		: "=m"(*p) : "r"(v) : "memory" );
+}
+
+static inline void
+atomic·or(volatile int *p, int v)
+{
+	__asm__ __volatile__(
+		"lock ; or %1, %0"
+		: "=m"(*p) : "r"(v) : "memory" );
+}
+
+static inline void
+atomic·inc(volatile int *p)
+{
+	__asm__ __volatile__(
+		"lock ; incl %0"
+		: "=m"(*p) : "m"(*p) : "memory" );
+}
+
+static inline void
+atomic·dec(volatile int *p)
+{
+	__asm__ __volatile__(
+		"lock ; decl %0"
+		: "=m"(*p) : "m"(*p) : "memory" );
+}
+
+static inline void
+atomic·store(volatile int *p, int x)
+{
+	__asm__ __volatile__(
+		"mov %1, %0 ; lock ; orl $0,(%%esp)"
+		: "=m"(*p) : "r"(x) : "memory" );
+}
+
+static inline void
+atomic·barrier()
+{
+	__asm__ __volatile__( "" : : : "memory" );
+}
+
+static inline void
+atomic·spin()
+{
+	__asm__ __volatile__( "pause" : : : "memory" );
+}
+
+static inline void
+atomic·crash()
+{
+	__asm__ __volatile__( "hlt" : : : "memory" );
+}
+
+static inline int
+atomic·ctz64(uint64 x)
+{
+	int r;
+	__asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; add $32,%0\n1:"
+		: "=&r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) );
+	return r;
+}
+
+static inline int
+atomic·ctz32(uint32 x)
+{
+	int r;
+	__asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
+	return r;
+}
+
+static inline int
+atomic·clz32(uint32 x)
+{
+	__asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) );
+	return x;
+}