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-rw-r--r--include/asm-sparc64/pil.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-sparc64/pil.h b/include/asm-sparc64/pil.h
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+++ b/include/asm-sparc64/pil.h
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+/* $Id: pil.h,v 1.1 2002/01/23 11:27:36 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) */