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-rw-r--r--open_issues/user-space_device_drivers.mdwn5
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diff --git a/open_issues/user-space_device_drivers.mdwn b/open_issues/user-space_device_drivers.mdwn
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+++ b/open_issues/user-space_device_drivers.mdwn
@@ -27,6 +27,11 @@ Also see [[device drivers and IO systems]].
* *Omega0* paper defines an interface.
+ * As is can be read in the *Mach 3 Kernel Principles*, there is an *event
+ object* facility in Mach that can be used for having user-space tasks react
+ to IRQs. However, at least in GNU Mach, that code (`kern/eventcount.c`)
+ doesn't seem functional at all and isn't integrated properly in the kernel.
+
## DMA
* Security considerations.