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-rw-r--r--arch/m68k/mac/macints.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/m68k/mac/macints.c b/arch/m68k/mac/macints.c
index 6c9ad9bbcc96..41dd164aac27 100644
--- a/arch/m68k/mac/macints.c
+++ b/arch/m68k/mac/macints.c
@@ -42,6 +42,18 @@
*
* 6 - off switch (?)
*
+ * Machines with Quadra-like VIA hardware, except PSC and PMU machines, support
+ * an alternate interrupt mapping, as used by A/UX. It spreads ethernet and
+ * sound out to their own autovector IRQs and gives VIA1 a higher priority:
+ *
+ * 1 - unused (?)
+ *
+ * 3 - on-board SONIC
+ *
+ * 5 - Apple Sound Chip (ASC)
+ *
+ * 6 - VIA1
+ *
* For OSS Macintoshes (IIfx only at this point):
*
* 3 - Nubus interrupt