i8259: Factor out base class for KVM reuse

Analogously to the APIC, we will reuse some parts of the user space
i8259 model for KVM. The base class provides a common device state, the
vmstate, the property list, a reset core and some shared init bits.

This also introduces a common helper to instantiate a single i8259 chip
from the cascade-creating i8259_init function.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

1 files changed, 147 insertions, 0 deletions

diff --git a/hw/i8259_common.c b/hw/i8259_common.c
new file mode 100644
index 0000000..e515876
--- /dev/null
+++ b/hw/i8259_common.c
@@ -0,0 +1,147 @@
+/*
+ * QEMU 8259 - common bits of emulated and KVM kernel model
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ * 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.
+ */
+#include "pc.h"
+#include "i8259_internal.h"
+
+void pic_reset_common(PICCommonState *s)
+{
+    s->last_irr = 0;
+    s->irr = 0;
+    s->imr = 0;
+    s->isr = 0;
+    s->priority_add = 0;
+    s->irq_base = 0;
+    s->read_reg_select = 0;
+    s->poll = 0;
+    s->special_mask = 0;
+    s->init_state = 0;
+    s->auto_eoi = 0;
+    s->rotate_on_auto_eoi = 0;
+    s->special_fully_nested_mode = 0;
+    s->init4 = 0;
+    s->single_mode = 0;
+    /* Note: ELCR is not reset */
+}
+
+static void pic_dispatch_pre_save(void *opaque)
+{
+    PICCommonState *s = opaque;
+    PICCommonInfo *info =
+        DO_UPCAST(PICCommonInfo, isadev.qdev, s->dev.qdev.info);
+
+    if (info->pre_save) {
+        info->pre_save(s);
+    }
+}
+
+static int pic_dispatch_post_load(void *opaque, int version_id)
+{
+    PICCommonState *s = opaque;
+    PICCommonInfo *info =
+        DO_UPCAST(PICCommonInfo, isadev.qdev, s->dev.qdev.info);
+
+    if (info->post_load) {
+        info->post_load(s);
+    }
+    return 0;
+}
+
+static int pic_init_common(ISADevice *dev)
+{
+    PICCommonState *s = DO_UPCAST(PICCommonState, dev, dev);
+    PICCommonInfo *info =
+        DO_UPCAST(PICCommonInfo, isadev.qdev, dev->qdev.info);
+
+    info->init(s);
+
+    isa_register_ioport(NULL, &s->base_io, s->iobase);
+    if (s->elcr_addr != -1) {
+        isa_register_ioport(NULL, &s->elcr_io, s->elcr_addr);
+    }
+
+    qdev_set_legacy_instance_id(&s->dev.qdev, s->iobase, 1);
+
+    return 0;
+}
+
+ISADevice *i8259_init_chip(const char *name, ISABus *bus, bool master)
+{
+    ISADevice *dev;
+
+    dev = isa_create(bus, name);
+    qdev_prop_set_uint32(&dev->qdev, "iobase", master ? 0x20 : 0xa0);
+    qdev_prop_set_uint32(&dev->qdev, "elcr_addr", master ? 0x4d0 : 0x4d1);
+    qdev_prop_set_uint8(&dev->qdev, "elcr_mask", master ? 0xf8 : 0xde);
+    qdev_prop_set_bit(&dev->qdev, "master", master);
+    qdev_init_nofail(&dev->qdev);
+
+    return dev;
+}
+
+static const VMStateDescription vmstate_pic_common = {
+    .name = "i8259",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .pre_save = pic_dispatch_pre_save,
+    .post_load = pic_dispatch_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(last_irr, PICCommonState),
+        VMSTATE_UINT8(irr, PICCommonState),
+        VMSTATE_UINT8(imr, PICCommonState),
+        VMSTATE_UINT8(isr, PICCommonState),
+        VMSTATE_UINT8(priority_add, PICCommonState),
+        VMSTATE_UINT8(irq_base, PICCommonState),
+        VMSTATE_UINT8(read_reg_select, PICCommonState),
+        VMSTATE_UINT8(poll, PICCommonState),
+        VMSTATE_UINT8(special_mask, PICCommonState),
+        VMSTATE_UINT8(init_state, PICCommonState),
+        VMSTATE_UINT8(auto_eoi, PICCommonState),
+        VMSTATE_UINT8(rotate_on_auto_eoi, PICCommonState),
+        VMSTATE_UINT8(special_fully_nested_mode, PICCommonState),
+        VMSTATE_UINT8(init4, PICCommonState),
+        VMSTATE_UINT8(single_mode, PICCommonState),
+        VMSTATE_UINT8(elcr, PICCommonState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static Property pic_properties_common[] = {
+    DEFINE_PROP_HEX32("iobase", PICCommonState, iobase,  -1),
+    DEFINE_PROP_HEX32("elcr_addr", PICCommonState, elcr_addr,  -1),
+    DEFINE_PROP_HEX8("elcr_mask", PICCommonState, elcr_mask,  -1),
+    DEFINE_PROP_BIT("master", PICCommonState, master,  0, false),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+void pic_qdev_register(PICCommonInfo *info)
+{
+    info->isadev.init = pic_init_common;
+    info->isadev.qdev.size = sizeof(PICCommonState);
+    info->isadev.qdev.vmsd = &vmstate_pic_common;
+    info->isadev.qdev.no_user = 1;
+    info->isadev.qdev.props = pic_properties_common;
+    isa_qdev_register(&info->isadev);
+}