Changeset 18e0a6c in mainline for arch/ia32/include/atomic.h

Timestamp:

2005-06-09T23:43:45Z (20 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

74df77d

Parents:

d896525

Message:

Implement several assembler functions in gcc's asm notation instead of in .s or .S file.
Gain both better speed and size.

File:

• arch/ia32/include/atomic.h (modified) (1 diff)

arch/ia32/include/atomic.h

@@ -32 +32 @@
 #include <arch/types.h>
 
-extern void atomic_inc(volatile int *val);
-extern void atomic_dec(volatile int *val);
+static inline void atomic_inc(volatile int *val) {
+#ifdef __SMP__
+        __asm__ volatile ("lock incl (%0)\n" : : "r" (val));
+#else
+        __asm__ volatile ("incl (%0)\n" : : "r" (val));
+#endif /* __SMP__ */
+}
 
-extern int test_and_set(int *val);
+static inline void atomic_dec(volatile int *val) {
+#ifdef __SMP__
+        __asm__ volatile ("lock decl (%0)\n" : : "r" (val));
+#else
+        __asm__ volatile ("decl (%0)\n" : : "r" (val));
+#endif /* __SMP__ */
+}
+
+static inline int test_and_set(int *val) {
+        int v;
+        
+        __asm__ volatile (
+                "movl $1, %0\n"
+                "xchgl %0, (%1)\n"
+                : "=r" (v)
+                : "r" (val)
+        );
+        
+        return v;
+}
+
+
 extern void spinlock_arch(int *val);