diff mbox series

[08/10] pckbd: add controller response queue

Message ID 20210505192133.7480-8-vr_qemu@t-online.de (mailing list archive)
State New, archived
Headers show
Series PS/2 controller related fixes | expand

Commit Message

Volker Rümelin May 5, 2021, 7:21 p.m. UTC
Add a separate queue for PS/2 controller responses. The
responses no longer get queued in the keyboard or mouse queues.
The advantage of this can be seen after the next patch, where
the guest can disable the PS/2 communication with the keyboard
and mouse and still talk to the PS/2 controller.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
---
 hw/input/pckbd.c | 38 +++++++++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index f8f3859b17..3c41c11841 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -132,11 +132,14 @@ 
 
 #define KBD_PENDING_KBD         1
 #define KBD_PENDING_AUX         2
+#define KBD_PENDING_CTRL_KBD    0x04
+#define KBD_PENDING_CTRL_AUX    0x08
 
 #define KBD_MIGR_TIMER_PENDING  0x1
 
 #define KBD_OBSRC_KBD           0x01
 #define KBD_OBSRC_MOUSE         0x02
+#define KBD_OBSRC_CTRL          0x04
 
 typedef struct KBDState {
     uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
@@ -149,6 +152,7 @@  typedef struct KBDState {
     /* Bitmask of devices with data available.  */
     uint8_t pending;
     uint8_t obdata;
+    uint8_t cbdata;
     void *kbd;
     void *mouse;
     QEMUTimer *throttle_timer;
@@ -199,12 +203,18 @@  static void kbd_update_irq(KBDState *s)
     if (s->pending) {
         s->status |= KBD_STAT_OBF;
         s->outport |= KBD_OUT_OBF;
-        if (s->pending == KBD_PENDING_AUX) {
+        if (s->pending & KBD_PENDING_CTRL_KBD) {
+            s->obsrc = KBD_OBSRC_CTRL;
+        } else if (s->pending & KBD_PENDING_CTRL_AUX) {
             s->status |= KBD_STAT_MOUSE_OBF;
             s->outport |= KBD_OUT_MOUSE_OBF;
-            s->obsrc = KBD_OBSRC_MOUSE;
-        } else {
+            s->obsrc = KBD_OBSRC_CTRL;
+        } else if (s->pending & KBD_PENDING_KBD) {
             s->obsrc = KBD_OBSRC_KBD;
+        } else {
+            s->status |= KBD_STAT_MOUSE_OBF;
+            s->outport |= KBD_OUT_MOUSE_OBF;
+            s->obsrc = KBD_OBSRC_MOUSE;
         }
     }
     kbd_update_irq_lines(s);
@@ -276,10 +286,21 @@  static uint64_t kbd_read_status(void *opaque, hwaddr addr,
 
 static void kbd_queue(KBDState *s, int b, int aux)
 {
-    if (aux)
-        ps2_queue(s->mouse, b);
-    else
-        ps2_queue(s->kbd, b);
+    s->cbdata = b;
+    s->pending &= ~KBD_PENDING_CTRL_KBD & ~KBD_PENDING_CTRL_AUX;
+    s->pending |= aux ? KBD_PENDING_CTRL_AUX : KBD_PENDING_CTRL_KBD;
+    kbd_safe_update_irq(s);
+}
+
+static uint8_t kbd_dequeue(KBDState *s)
+{
+    uint8_t b = s->cbdata;
+
+    s->pending &= ~KBD_PENDING_CTRL_KBD & ~KBD_PENDING_CTRL_AUX;
+    if (s->pending) {
+        kbd_update_irq(s);
+    }
+    return b;
 }
 
 static void outport_write(KBDState *s, uint32_t val)
@@ -389,6 +410,8 @@  static uint64_t kbd_read_data(void *opaque, hwaddr addr,
             s->obdata = ps2_read_data(s->kbd);
         } else if (s->obsrc & KBD_OBSRC_MOUSE) {
             s->obdata = ps2_read_data(s->mouse);
+        } else if (s->obsrc & KBD_OBSRC_CTRL) {
+            s->obdata = kbd_dequeue(s);
         }
     }
 
@@ -530,6 +553,7 @@  static const VMStateDescription vmstate_kbd = {
         VMSTATE_UINT32_V(migration_flags, KBDState, 4),
         VMSTATE_UINT32_V(obsrc, KBDState, 4),
         VMSTATE_UINT8_V(obdata, KBDState, 4),
+        VMSTATE_UINT8_V(cbdata, KBDState, 4),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (const VMStateDescription*[]) {