[PATCH v4 07/12] pckbd: add state variable for interrupt source

["Volker Rümelin" <vr_qemu@t-online.de>]

Currently there is only one flag to distinguish between two
interrupt sources and there are no available flags for more
sources. Add an internal state variable to store the interrupt
source. The next patch will introduce an additional interrupt
source. There is no functional change.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
---
 hw/input/pckbd.c | 33 ++++++++++++++++++++++++++++-----
 1 file changed, 28 insertions(+), 5 deletions(-)

diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index 516ed5a397..62a3b29074 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -136,14 +136,19 @@
 
 #define KBD_MIGR_TIMER_PENDING  0x1
 
+#define KBD_OBSRC_KBD           0x01
+#define KBD_OBSRC_MOUSE         0x02
+
 typedef struct KBDState {
     uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
     uint8_t status;
     uint8_t mode;
     uint8_t outport;
     uint32_t migration_flags;
+    uint32_t obsrc;
     bool outport_present;
     bool extended_state;
+    bool extended_state_loaded;
     /* Bitmask of devices with data available.  */
     uint8_t pending;
     uint8_t obdata;
@@ -200,6 +205,9 @@ static void kbd_update_irq(KBDState *s)
         if (s->pending == KBD_PENDING_AUX) {
             s->status |= KBD_STAT_MOUSE_OBF;
             s->outport |= KBD_OUT_MOUSE_OBF;
+            s->obsrc = KBD_OBSRC_MOUSE;
+        } else {
+            s->obsrc = KBD_OBSRC_KBD;
         }
     }
     kbd_update_irq_lines(s);
@@ -370,18 +378,17 @@ static uint64_t kbd_read_data(void *opaque, hwaddr addr,
                               unsigned size)
 {
     KBDState *s = opaque;
-    uint8_t status = s->status;
 
-    if (status & KBD_STAT_OBF) {
+    if (s->status & KBD_STAT_OBF) {
         kbd_deassert_irq(s);
-        if (status & KBD_STAT_MOUSE_OBF) {
-            s->obdata = ps2_read_data(s->mouse);
-        } else {
+        if (s->obsrc & KBD_OBSRC_KBD) {
             if (s->throttle_timer) {
                 timer_mod(s->throttle_timer,
                           qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 1000);
             }
             s->obdata = ps2_read_data(s->kbd);
+        } else if (s->obsrc & KBD_OBSRC_MOUSE) {
+            s->obdata = ps2_read_data(s->mouse);
         }
     }
 
@@ -498,6 +505,7 @@ static int kbd_extended_state_post_load(void *opaque, int version_id)
     if (s->migration_flags & KBD_MIGR_TIMER_PENDING) {
         kbd_throttle_timeout(s);
     }
+    s->extended_state_loaded = true;
 
     return 0;
 }
@@ -516,11 +524,20 @@ static const VMStateDescription vmstate_kbd_extended_state = {
     .needed = kbd_extended_state_needed,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32(migration_flags, KBDState),
+        VMSTATE_UINT32(obsrc, KBDState),
         VMSTATE_UINT8(obdata, KBDState),
         VMSTATE_END_OF_LIST()
     }
 };
 
+static int kbd_pre_load(void *opaque)
+{
+    KBDState *s = opaque;
+
+    s->extended_state_loaded = false;
+    return 0;
+}
+
 static int kbd_post_load(void *opaque, int version_id)
 {
     KBDState *s = opaque;
@@ -528,6 +545,11 @@ static int kbd_post_load(void *opaque, int version_id)
         s->outport = kbd_outport_default(s);
     }
     s->outport_present = false;
+    if (!s->extended_state_loaded) {
+        s->obsrc = s->status & KBD_STAT_OBF ?
+            (s->status & KBD_STAT_MOUSE_OBF ? KBD_OBSRC_MOUSE : KBD_OBSRC_KBD) :
+            0;
+    }
     return 0;
 }
 
@@ -535,6 +557,7 @@ static const VMStateDescription vmstate_kbd = {
     .name = "pckbd",
     .version_id = 3,
     .minimum_version_id = 3,
+    .pre_load = kbd_pre_load,
     .post_load = kbd_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT8(write_cmd, KBDState),
-- 
2.26.2