i8254: Factor out base class for KVM reuse

Applying the concept used for the *PICs once again: establish a base
class for the i8254 that can be used both by the current user space
emulation and the upcoming KVM in-kernel version. We share most of the
public interface of the i8254, specifically to the pcspk, vmstate, reset
and certain init parts.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 85 insertions, 0 deletions

diff --git a/hw/i8254_internal.h b/hw/i8254_internal.h
new file mode 100644
index 0000000000..686f0c2ba9
--- /dev/null
+++ b/hw/i8254_internal.h
@@ -0,0 +1,85 @@
+/*
+ * QEMU 8253/8254 - internal interfaces
+ *
+ * Copyright (c) 2011 Jan Kiszka, Siemens AG
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef QEMU_I8254_INTERNAL_H
+#define QEMU_I8254_INTERNAL_H
+
+#include "hw.h"
+#include "pc.h"
+#include "isa.h"
+
+typedef struct PITChannelState {
+    int count; /* can be 65536 */
+    uint16_t latched_count;
+    uint8_t count_latched;
+    uint8_t status_latched;
+    uint8_t status;
+    uint8_t read_state;
+    uint8_t write_state;
+    uint8_t write_latch;
+    uint8_t rw_mode;
+    uint8_t mode;
+    uint8_t bcd; /* not supported */
+    uint8_t gate; /* timer start */
+    int64_t count_load_time;
+    /* irq handling */
+    int64_t next_transition_time;
+    QEMUTimer *irq_timer;
+    qemu_irq irq;
+    uint32_t irq_disabled;
+} PITChannelState;
+
+typedef struct PITCommonState {
+    ISADevice dev;
+    MemoryRegion ioports;
+    uint32_t iobase;
+    PITChannelState channels[3];
+} PITCommonState;
+
+#define TYPE_PIT_COMMON "pit-common"
+#define PIT_COMMON(obj) \
+     OBJECT_CHECK(PITCommonState, (obj), TYPE_PIT_COMMON)
+#define PIT_COMMON_CLASS(klass) \
+     OBJECT_CLASS_CHECK(PITCommonClass, (klass), TYPE_PIT_COMMON)
+#define PIT_COMMON_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(PITCommonClass, (obj), TYPE_PIT_COMMON)
+
+typedef struct PITCommonClass {
+    ISADeviceClass parent_class;
+
+    int (*init)(PITCommonState *s);
+    void (*set_channel_gate)(PITCommonState *s, PITChannelState *sc, int val);
+    void (*get_channel_info)(PITCommonState *s, PITChannelState *sc,
+                             PITChannelInfo *info);
+    void (*pre_save)(PITCommonState *s);
+    void (*post_load)(PITCommonState *s);
+} PITCommonClass;
+
+int pit_get_out(PITChannelState *s, int64_t current_time);
+int64_t pit_get_next_transition_time(PITChannelState *s, int64_t current_time);
+void pit_get_channel_info_common(PITCommonState *s, PITChannelState *sc,
+                                 PITChannelInfo *info);
+void pit_reset_common(PITCommonState *s);
+
+#endif /* !QEMU_I8254_INTERNAL_H */