* [9fans] Weird error. @ 2003-01-19 21:30 Dan Cross 2003-01-19 21:32 ` Russ Cox 2003-01-19 21:34 ` Dan Cross 0 siblings, 2 replies; 5+ messages in thread From: Dan Cross @ 2003-01-19 21:30 UTC (permalink / raw) To: 9fans I ran into this error trying to open /dev/eia1. Has anyone else seen it? I haven't investigated it further, but it shows up after the first either the first read or write from/to the serial port after the following sequence of events: (1) boot (2) open the serial port (3) read and write from it (4) close it (5) reopen it Any ideas? - Dan C. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Weird error. 2003-01-19 21:30 [9fans] Weird error Dan Cross @ 2003-01-19 21:32 ` Russ Cox 2003-01-19 21:34 ` Dan Cross 1 sibling, 0 replies; 5+ messages in thread From: Russ Cox @ 2003-01-19 21:32 UTC (permalink / raw) To: 9fans what is the error? ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Weird error. 2003-01-19 21:30 [9fans] Weird error Dan Cross 2003-01-19 21:32 ` Russ Cox @ 2003-01-19 21:34 ` Dan Cross 2003-01-20 11:20 ` Richard Miller 1 sibling, 1 reply; 5+ messages in thread From: Dan Cross @ 2003-01-19 21:34 UTC (permalink / raw) To: 9fans > I ran into this error trying to open /dev/eia1. Has anyone else seen > it? I haven't investigated it further, but it shows up after the first > either the first read or write from/to the serial port after the > following sequence of events: > > (1) boot > (2) open the serial port > (3) read and write from it > (4) close it > (5) reopen it > > Any ideas? Whoops. It would help if I included the error. Sun Jan 19 12:45:36: mpintrenable: multiple botch irq3, tbdf 5000000, lo 00000979, n 00000979 Sun Jan 19 12:45:36: intrenable: couldn't enable irq 3, tbdf 0xFFFFFFFF for COM2 That's from my clog's. I stripped out some carriage returns, though. Thanks! - Dan C. ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Weird error. 2003-01-19 21:34 ` Dan Cross @ 2003-01-20 11:20 ` Richard Miller 2003-01-20 20:50 ` Dan Cross 0 siblings, 1 reply; 5+ messages in thread From: Richard Miller @ 2003-01-20 11:20 UTC (permalink / raw) To: 9fans > Sun Jan 19 12:45:36: mpintrenable: multiple botch irq3, tbdf 5000000, lo 00000979, n 00000979 It's a benign error message resulting from the interaction of three mostly harmless bugs: 1. intdisable() on x86 MP architecture doesn't actually disable interrupts. The comment says: * For now, none of this will work with the APIC code, 2. i8250disable() marks the UART disabled after calling intdisable(), without checking whether the disable succeeded. So the next time the UART device is opened the interrupt is enabled again. 3. mpintrenablex() doesn't distinguish correctly between enabling a device twice and enabling multiple devices (or multifunction devices) which share an interrupt. I think 2. would be the easiest to fix, for example as follows: /sys/src/9/pc/fns.h:61 c fns.h:61 < void intrdisable(int, void (*)(Ureg *, void *), void*, int, char*); --- > int intrdisable(int, void (*)(Ureg *, void *), void*, int, char*); /sys/src/9/pc/trap.c:67 c trap.c:67 < void --- > int /sys/src/9/pc/trap.c:79 c trap.c:79 < return; --- > return -1; /sys/src/9/pc/trap.c:95 a trap.c:96 > return 0; /sys/src/9/pc/uarti8250.c:530,531 c uarti8250.c:530,531 < intrdisable(ctlr->irq, i8250interrupt, uart, ctlr->tbdf, uart->name); < ctlr->iena = 0; --- > if(intrdisable(ctlr->irq, i8250interrupt, uart, ctlr->tbdf, uart->name) == 0) > ctlr->iena = 0; ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [9fans] Weird error. 2003-01-20 11:20 ` Richard Miller @ 2003-01-20 20:50 ` Dan Cross 0 siblings, 0 replies; 5+ messages in thread From: Dan Cross @ 2003-01-20 20:50 UTC (permalink / raw) To: 9fans > It's a benign error message resulting from the interaction of three > mostly harmless bugs: Cool. Thanks for the great explanation, Richard. - Dan C. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2003-01-20 20:50 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2003-01-19 21:30 [9fans] Weird error Dan Cross 2003-01-19 21:32 ` Russ Cox 2003-01-19 21:34 ` Dan Cross 2003-01-20 11:20 ` Richard Miller 2003-01-20 20:50 ` Dan Cross
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).