Index: packages/hal/powerpc/arch/current/include/basetype.h
===================================================================
RCS file: /cvs/ecos/ecos/packages/hal/powerpc/arch/current/include/basetype.h,v
retrieving revision 1.5
diff -u -r1.5 basetype.h
--- basetype.h	2000/08/25 17:33:19	1.5
+++ basetype.h	2001/10/22 21:12:49
@@ -60,6 +60,8 @@
 // The PowerPC architecture uses the default definitions of the base types,
 // so we do not need to define any here.
 
+#define cyg_halatomic	cyg_halint32
+
 //-----------------------------------------------------------------------------
 #endif // CYGONCE_HAL_BASETYPE_H
 // End of basetype.h
Index: packages/hal/powerpc/arch/current/include/hal_arch.h
===================================================================
RCS file: /cvs/ecos/ecos/packages/hal/powerpc/arch/current/include/hal_arch.h,v
retrieving revision 1.8
diff -u -r1.8 hal_arch.h
--- hal_arch.h	2000/10/23 17:11:21	1.8
+++ hal_arch.h	2001/10/22 21:12:49
@@ -339,6 +339,41 @@
 #define CYGARC_HAL_SAVE_GP()
 #define CYGARC_HAL_RESTORE_GP()
 
+#define	HAL_READ_BARRIER()	asm volatile("isync" : : : "memory")
+#define	HAL_WRITE_BARRIER()	asm volatile("eieio" : : : "memory")
+
+static inline int
+hal_atomic_cas(cyg_atomic* addr, cyg_atomic cmpval, cyg_atomic newval)
+{
+    cyg_atomic oldval;
+
+    asm volatile (
+    "0:	lwarx	%0,0,%1	;"
+    "	cmpw	%0,%2	;"
+    "	bne-	1f	;"
+    "	stwcx.	%3,0,%1	;"
+    "	bne-	0b	;"
+    "1:			;"
+	: "=&r" (oldval)
+	: "r" (addr), "r" (cmpval), "r" (newval)
+	: "memory", "cc"
+    );
+
+    return oldval == cmpval;
+}
+
+#define	HAL_COMPARE_AND_SWAP_RELEASE(_addr_, _cmp_, _new_)	\
+    hal_atomic_cas(_addr_, _cmp_, _new_)
+
+#define	HAL_COMPARE_AND_SWAP_ACQUIRE(_addr_, _cmp_, _new_)	\
+    hal_atomic_cas(_addr_, _cmp_, _new_)
+
+#define	HAL_STORE_RELEASE(_addr_, _val_)			\
+    CYG_MACRO_START						\
+    *(_addr_) = (_val_);					\
+    HAL_WRITE_BARRIER();					\
+    CYG_MACRO_END
+
 //-----------------------------------------------------------------------------
 #endif // CYGONCE_HAL_ARCH_H
 // End of hal_arch.h