patch-2.1.48 linux/include/asm-sparc64/smp_lock.h

• Lines: 71
• Date: Thu Jul 31 13:09:18 1997
• Orig file: v2.1.47/linux/include/asm-sparc64/smp_lock.h
• Orig date: Wed Apr 23 19:01:28 1997

diff -u --recursive --new-file v2.1.47/linux/include/asm-sparc64/smp_lock.h linux/include/asm-sparc64/smp_lock.h
@@ -18,7 +18,69 @@
 #define reacquire_kernel_lock(task, cpu, depth)	do { } while(0)
 
 #else
-#error SMP on sparc64 not supported yet
+
+#include <asm/hardirq.h>
+
+/* 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)
+
+/* Do not fuck with this without consulting arch/sparc64/lib/locks.S first! */
+#define reacquire_kernel_lock(task, cpu, depth)					\
+do {										\
+	if(depth) {								\
+		register struct klock_info *klip asm("g1");			\
+		klip = &klock_info;						\
+		__asm__ __volatile__("mov	%%o7, %%g5\n\t"			\
+				     "call	___lock_reacquire_kernel\n\t"	\
+				     " mov	%1, %%g2"			\
+				     : /* No outputs. */			\
+				     : "r" (klip), "r" (depth)			\
+				     : "g2", "g3", "g5", "g7", "memory", "cc");	\
+	}									\
+} 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.
+ */
+
+/* Do not fuck with this without consulting arch/sparc64/lib/locks.S first! */
+extern __inline__ void lock_kernel(void)
+{
+	register struct klock_info *klip asm("g1");
+	klip = &klock_info;
+	__asm__ __volatile__("
+	mov	%%o7, %%g5
+	call	___lock_kernel
+	 ld	[%%g6 + %0], %%g2
+"	: : "i" (AOFF_task_lock_depth), "r" (klip)
+	: "g2", "g3", "g5", "g7", "memory", "cc");
+}
+
+/* Release kernel global lock. */
+extern __inline__ void unlock_kernel(void)
+{
+	register struct klock_info *klip asm("g1");
+	klip = &klock_info;
+	__asm__ __volatile__("
+	mov	%%o7, %%g5
+	call	___unlock_kernel
+	 ld	[%%g6 + %0], %%g2
+"	: : "i" (AOFF_task_lock_depth), "r" (klip)
+	: "g2", "g3", "g5", "memory", "cc");
+}
+
 #endif /* (__SMP__) */
 
 #endif /* !(__SPARC64_SMPLOCK_H) */