On 31-May-2002 Bosko Milekic wrote: > > On Fri, May 31, 2002 at 12:12:00PM +0300, Aaro J Koskinen wrote: >> Hello, >> >> Is there any particular reason why the number of interrupts is limited >> to 32 on APIC systems? Is it just a conservative guess on the number of >> interrupts anyone might want to need...? > > I'm not sure but perhaps this is historical (and now also required > again), but if we use a word to mask out interrupts than after 32 we > run out of bits. "Who needs more than 32 interrupts anyway?!" :-)
Actually, the historical value in stable is 24 because the same 32-bit word shares the 8 softinterrupts with 24 hardware interrupts. I think the APIC only has 32 interrupt pins however. -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
