Author: cem
Date: Thu Mar 14 21:08:48 2019
New Revision: 345158
URL: https://svnweb.freebsd.org/changeset/base/345158
Log:
bhyve(8): Fix uart emulation bug
THRE is always asserted in LSR reads, so REG_IER writes that raise
IER_ETXRDY must also set thre_int_pending.
Reported by: Illumos, according to emaste@
https://twitter.com/ed_maste/status/1106195949087584258
MFC after: 2 weeks
Modified:
head/usr.sbin/bhyve/uart_emul.c
Modified: head/usr.sbin/bhyve/uart_emul.c
==============================================================================
--- head/usr.sbin/bhyve/uart_emul.c Thu Mar 14 20:32:48 2019
(r345157)
+++ head/usr.sbin/bhyve/uart_emul.c Thu Mar 14 21:08:48 2019
(r345158)
@@ -431,6 +431,9 @@ uart_write(struct uart_softc *sc, int offset, uint8_t
sc->thre_int_pending = true;
break;
case REG_IER:
+ /* Set pending when IER_ETXRDY is raised (edge-triggered). */
+ if ((sc->ier & IER_ETXRDY) == 0 && (value & IER_ETXRDY) != 0)
+ sc->thre_int_pending = true;
/*
* Apply mask so that bits 4-7 are 0
* Also enables bits 0-3 only if they're 1
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
