* [Qemu-devel] [5264] Add a comment about masking of CTI interrupt in 16550A UART.
@ 2008-09-20 1:15 Andrzej Zaborowski
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From: Andrzej Zaborowski @ 2008-09-20 1:15 UTC (permalink / raw)
To: qemu-devel
Revision: 5264
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5264
Author: balrog
Date: 2008-09-20 01:15:04 +0000 (Sat, 20 Sep 2008)
Log Message:
-----------
Add a comment about masking of CTI interrupt in 16550A UART.
Modified Paths:
--------------
trunk/hw/serial.c
Modified: trunk/hw/serial.c
===================================================================
--- trunk/hw/serial.c 2008-09-20 01:10:32 UTC (rev 5263)
+++ trunk/hw/serial.c 2008-09-20 01:15:04 UTC (rev 5264)
@@ -192,6 +192,9 @@
if ((s->ier & UART_IER_RLSI) && (s->lsr & UART_LSR_INT_ANY)) {
tmp_iir = UART_IIR_RLSI;
} else if ((s->ier & UART_IER_RDI) && s->timeout_ipending) {
+ /* Note that(s->ier & UART_IER_RDI) can mask this interrupt,
+ * this is not in the specification but is observed on existing
+ * hardware. */
tmp_iir = UART_IIR_CTI;
} else if ((s->ier & UART_IER_RDI) && (s->lsr & UART_LSR_DR)) {
if (!(s->fcr & UART_FCR_FE)) {
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