i386 vsyscall support (vdso-provided sysenter/syscall instruction based)

[musl] / arch / i386 / atomic.h

diff --git a/arch/i386/atomic.h b/arch/i386/atomic.h
index e74e453..77b0b3b 100644 (file)
--- a/arch/i386/atomic.h
+++ b/arch/i386/atomic.h
@@ -1,5 +1,5 @@
-#ifndef _INTERNAA_ATOMIC_H
-#define _INTERNAA_ATOMIC_H
+#ifndef _INTERNAL_ATOMIC_H
+#define _INTERNAL_ATOMIC_H
 
 #include <stdint.h>
 
@@ -11,6 +11,12 @@ static inline int a_ctz_64(uint64_t x)
        return r;
 }
 
+static inline int a_ctz_l(unsigned long x)
+{
+       long r;
+       __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
+       return r;
+}
 
 static inline void a_and_64(volatile uint64_t *p, uint64_t v)
 {
@@ -49,6 +55,13 @@ static inline long a_cas_l(volatile void *p, long t, long s)
        return t;
 }
 
+static inline int a_cas(volatile int *p, int t, int s)
+{
+       __asm__( "lock ; cmpxchg %3, %1"
+               : "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
+       return t;
+}
+
 static inline void *a_swap_p(void *volatile *x, void *v)
 {
        __asm__( "xchg %0, %1" : "=r"(v), "=m"(*(void **)x) : "0"(v) : "memory" );
@@ -106,5 +119,10 @@ static inline void a_spin()
        __asm__ __volatile__( "pause" : : : "memory" );
 }
 
+static inline void a_crash()
+{
+       __asm__ __volatile__( "hlt" : : : "memory" );
+}
+
 
 #endif