patch-2.1.53 linux/include/asm-ppc/smp_lock.h

• Lines: 59
• Date: Thu Sep 4 12:54:49 1997
• Orig file: v2.1.52/linux/include/asm-ppc/smp_lock.h
• Orig date: Mon Aug 4 16:25:39 1997

diff -u --recursive --new-file v2.1.52/linux/include/asm-ppc/smp_lock.h linux/include/asm-ppc/smp_lock.h
@@ -1,6 +1,7 @@
 #ifndef __PPC_SMPLOCK_H
 #define __PPC_SMPLOCK_H
 
+#include <linux/kernel.h> /* for panic */
 #ifndef __SMP__
 
 #define lock_kernel()		do { } while (0)
@@ -10,7 +11,49 @@
 
 #else
 
-#error need to defined lock_kernel and unlock_kernel, etc.
+/* Release global kernel lock and global interrupt lock */
+#define release_kernel_lock(task, cpu, depth)		\
+do {							\
+	if((depth = (task)->lock_depth) != 0) {		\
+		__cli();				\
+		(task)->lock_depth = 0;			\
+		klock_info.akp = NO_PROC_ID;		\
+		klock_info.kernel_flag = 0;		\
+	}						\
+	release_irqlock(cpu);				\
+	__sti();					\
+} while(0)
+
+/* Re-acquire the kernel lock */
+#define reacquire_kernel_lock(task, cpu, depth) \
+do { if (depth) \
+	{ __cli(); \
+	  __asm__ __volatile__( \
+	  "blr __lock_kernel\n\t" \
+	  "stw %2,%0\n\t" \
+	  : "=m" (task->lock_depth) \
+	  : "d" (cpu), "c" (depth)); \
+	  __sti(); \
+       } \
+} while (0)
+
+/* The following acquire and release the master kernel global lock,
+ * the idea is that the usage of this mechanmism becomes less and less
+ * as time goes on, to the point where they are no longer needed at all
+ * and can thus disappear.
+ */
+
+extern __inline__ void lock_kernel(void)
+{
+	panic("lock_kernel()\n");
+}
+
+/* Release kernel global lock. */
+extern __inline__ void unlock_kernel(void)
+{
+	panic("unlock_kernel()\n");
+}
+
 
 #endif /* __SMP__ */
 #endif /* __PPC_SMPLOCK_H */