patch-2.4.19 linux-2.4.19/include/asm-sparc64/pil.h

• Lines: 27
• Date: Fri Aug 2 17:39:45 2002
• Orig file: linux-2.4.18/include/asm-sparc64/pil.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/include/asm-sparc64/pil.h linux-2.4.19/include/asm-sparc64/pil.h
@@ -0,0 +1,26 @@
+/* $Id: pil.h,v 1.1.2.1 2002/03/03 10:31:56 davem Exp $ */
+#ifndef _SPARC64_PIL_H
+#define _SPARC64_PIL_H
+
+/* To avoid some locking problems, we hard allocate certain PILs
+ * for SMP cross call messages that must do a etrap/rtrap.
+ *
+ * A cli() does not block the cross call delivery, so when SMP
+ * locking is an issue we reschedule the event into a PIL interrupt
+ * which is blocked by cli().
+ *
+ * In fact any XCALL which has to etrap/rtrap has a problem because
+ * it is difficult to prevent rtrap from running BH's, and that would
+ * need to be done if the XCALL arrived while %pil==15.
+ */
+#define PIL_SMP_CALL_FUNC	1
+#define PIL_SMP_RECEIVE_SIGNAL	2
+#define PIL_SMP_CAPTURE		3
+
+#ifndef __ASSEMBLY__
+#define PIL_RESERVED(PIL)	((PIL) == PIL_SMP_CALL_FUNC || \
+				 (PIL) == PIL_SMP_RECEIVE_SIGNAL || \
+				 (PIL) == PIL_SMP_CAPTURE)
+#endif
+
+#endif /* !(_SPARC64_PIL_H) */