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authorJun Nakajima <jnakajim@gmail.com>2011-02-02 23:49:59 -0800
committerJun Nakajima <jnakajim@gmail.com>2011-02-02 23:49:59 -0800
commit334ab475d2f27dbf6fbf836c2d4fb86dbb02a15c (patch)
tree31739daf9666b860cac11a6af58ec7d0cfb59bd4 /hw/goldfish_events_device.c
parent65842c595f20efb0522fe3684716388bc1e87477 (diff)
downloadexternal_qemu-334ab475d2f27dbf6fbf836c2d4fb86dbb02a15c.zip
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x86: Add x86 support. Rebase the change (20906/1) due to a minor conflict.
Change-Id: Ic73cca0fc6c6e5cf74f63daa6080d00aa7c392bb Signed-off-by: Xiaohui Xin <xiaohui.xin@intel.com> Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
Diffstat (limited to 'hw/goldfish_events_device.c')
-rw-r--r--hw/goldfish_events_device.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/hw/goldfish_events_device.c b/hw/goldfish_events_device.c
index 549fe4b..afc1724 100644
--- a/hw/goldfish_events_device.c
+++ b/hw/goldfish_events_device.c
@@ -149,7 +149,23 @@ static unsigned dequeue_event(events_state *s)
if(s->first == s->last) {
qemu_irq_lower(s->irq);
}
-
+#ifdef TARGET_I386
+ /*
+ * Adding the logic to handle edge-triggered interrupts for x86
+ * because the exisiting goldfish events device basically provides
+ * level-trigger interrupts only.
+ *
+ * Logic: When an event (including the type/code/value) is fetched
+ * by the driver, if there is still another event in the event
+ * queue, the goldfish event device will re-assert the IRQ so that
+ * the driver can be notified to fetch the event again.
+ */
+ else if (((s->first + 2) & (MAX_EVENTS - 1)) < s->last ||
+ (s->first & (MAX_EVENTS - 1)) > s->last) { /* if there still is an event */
+ qemu_irq_lower(s->irq);
+ qemu_irq_raise(s->irq);
+ }
+#endif
return n;
}