diff options
| -rw-r--r-- | sys/sys/bus.h | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/sys/sys/bus.h b/sys/sys/bus.h index c363d1ec550e..26d100aba222 100644 --- a/sys/sys/bus.h +++ b/sys/sys/bus.h @@ -252,17 +252,19 @@ typedef void driver_intr_t(void*); /** * @brief Interrupt type bits. - * - * These flags are used both by newbus interrupt - * registration (nexus.c) and also in struct intrec, which defines - * interrupt properties. * - * XXX We should probably revisit this and remove the vestiges of the - * spls implicit in names like INTR_TYPE_TTY. In the meantime, don't - * confuse things by renaming them (Grog, 18 July 2000). + * These flags may be passed by drivers to bus_setup_intr(9) when + * registering a new interrupt handler. The field is overloaded to + * specify both the interrupt's type and any special properties. * - * Buses which do interrupt remapping will want to change their type - * to reflect what sort of devices are underneath. + * The INTR_TYPE* bits will be passed to intr_priority(9) to determine + * the scheduling priority of the handler's ithread. Historically, each + * type was assigned a unique scheduling preference, but now only + * INTR_TYPE_CLK receives a default priority higher than other + * interrupts. See sys/priority.h. + * + * Buses may choose to modify or augment these flags as appropriate, + * e.g. nexus may apply INTR_EXCL. */ enum intr_type { INTR_TYPE_TTY = 1, |