Author: grehan
Date: Fri Jun 28 06:25:04 2013
New Revision: 252336
URL: http://svnweb.freebsd.org/changeset/base/252336
Log:
Allow 8259 registers to be read. This is a transient condition
during Linux boot.
Submitted by: tycho nightingale at pluribusnetworks com
Reviewed by: neel
Modified:
head/usr.sbin/bhyve/atpic.c
Modified: head/usr.sbin/bhyve/atpic.c
==============================================================================
--- head/usr.sbin/bhyve/atpic.c Fri Jun 28 06:05:33 2013 (r252335)
+++ head/usr.sbin/bhyve/atpic.c Fri Jun 28 06:25:04 2013 (r252336)
@@ -37,13 +37,6 @@ __FBSDID("$FreeBSD$");
#include "inout.h"
-/*
- * FreeBSD only writes to the 8259 interrupt controllers to put them in a
- * shutdown state.
- *
- * So, we just ignore the writes.
- */
-
#define IO_ICU1 0x20
#define IO_ICU2 0xA0
#define ICU_IMR_OFFSET 1
@@ -55,8 +48,14 @@ atpic_handler(struct vmctx *ctx, int vcp
if (bytes != 1)
return (-1);
- if (in)
- return (-1);
+ if (in) {
+ if (port & ICU_IMR_OFFSET) {
+ /* all interrupts masked */
+ *eax = 0xff;
+ } else {
+ *eax = 0x00;
+ }
+ }
/* Pretend all writes to the 8259 are alright */
return (0);
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