summaryrefslogtreecommitdiffstats
path: root/include/asm-sparc64/pil.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-sparc64/pil.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-sparc64/pil.h')
-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
new file mode 100644
index 00000000000..8f87750c351
--- /dev/null
+++ b/include/asm-sparc64/pil.h
@@ -0,0 +1,26 @@
+/* $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) */