Basic qdev infrastructure.

Signed-off-by: Paul Brook <paul@codesourcery.com>

1 files changed, 237 insertions, 0 deletions

diff --git a/hw/qdev.c b/hw/qdev.c
new file mode 100644
index 000000000..eaa30f430
--- /dev/null
+++ b/hw/qdev.c
@@ -0,0 +1,237 @@
+/*
+ *  Dynamic device configuration and creation.
+ *
+ *  Copyright (c) 2009 CodeSourcery
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
+ */
+
+/* The theory here is that it should be possible to create a machine without
+   knowledge of specific devices.  Historically board init routines have
+   passed a bunch of arguments to each device, requiring the board know
+   exactly which device it is dealing with.  This file provides an abstract
+   API for device configuration and initialization.  Devices will generally
+   inherit from a particular bus (e.g. PCI or I2C) rather than
+   this API directly.  */
+
+#include "qdev.h"
+#include "sysemu.h"
+
+struct DeviceProperty {
+    const char *name;
+    union {
+        int i;
+        void *ptr;
+    } value;
+    DeviceProperty *next;
+};
+
+struct DeviceType {
+    const char *name;
+    qdev_initfn init;
+    void *opaque;
+    int size;
+    DeviceType *next;
+};
+
+static DeviceType *device_type_list;
+
+/* Register a new device type.  */
+DeviceType *qdev_register(const char *name, int size, qdev_initfn init,
+                          void *opaque)
+{
+    DeviceType *t;
+
+    assert(size >= sizeof(DeviceState));
+
+    t = qemu_mallocz(sizeof(DeviceType));
+    t->next = device_type_list;
+    device_type_list = t;
+    t->name = qemu_strdup(name);
+    t->size = size;
+    t->init = init;
+    t->opaque = opaque;
+
+    return t;
+}
+
+/* Create a new device.  This only initializes the device state structure
+   and allows properties to be set.  qdev_init should be called to
+   initialize the actual device emulation.  */
+DeviceState *qdev_create(void *bus, const char *name)
+{
+    DeviceType *t;
+    DeviceState *dev;
+
+    for (t = device_type_list; t; t = t->next) {
+        if (strcmp(t->name, name) == 0) {
+            break;
+        }
+    }
+    if (!t) {
+        fprintf(stderr, "Unknown device '%s'\n", name);
+        exit(1);
+    }
+
+    dev = qemu_mallocz(t->size);
+    dev->name = name;
+    dev->type = t;
+    dev->bus = bus;
+    return dev;
+}
+
+/* Initialize a device.  Device properties should be set before calling
+   this function.  IRQs and MMIO regions should be connected/mapped after
+   calling this function.  */
+void qdev_init(DeviceState *dev)
+{
+    dev->type->init(dev, dev->type->opaque);
+}
+
+static DeviceProperty *create_prop(DeviceState *dev, const char *name)
+{
+    DeviceProperty *prop;
+
+    /* TODO: Check for duplicate properties.  */
+    prop = qemu_mallocz(sizeof(*prop));
+    prop->name = qemu_strdup(name);
+    prop->next = dev->props;
+    dev->props = prop;
+
+    return prop;
+}
+
+void qdev_set_prop_int(DeviceState *dev, const char *name, int value)
+{
+    DeviceProperty *prop;
+
+    prop = create_prop(dev, name);
+    prop->value.i = value;
+}
+
+void qdev_set_prop_ptr(DeviceState *dev, const char *name, void *value)
+{
+    DeviceProperty *prop;
+
+    prop = create_prop(dev, name);
+    prop->value.ptr = value;
+}
+
+
+qemu_irq qdev_get_irq_sink(DeviceState *dev, int n)
+{
+    assert(n >= 0 && n < dev->num_irq_sink);
+    return dev->irq_sink[n];
+}
+
+/* Register device IRQ sinks.  */
+void qdev_init_irq_sink(DeviceState *dev, qemu_irq_handler handler, int nirq)
+{
+    dev->num_irq_sink = nirq;
+    dev->irq_sink = qemu_allocate_irqs(handler, dev, nirq);
+}
+
+/* Get a character (serial) device interface.  */
+CharDriverState *qdev_init_chardev(DeviceState *dev)
+{
+    static int next_serial;
+    static int next_virtconsole;
+    /* FIXME: This is a nasty hack that needs to go away.  */
+    if (strncmp(dev->name, "virtio", 6) == 0) {
+        return virtcon_hds[next_virtconsole++];
+    } else {
+        return serial_hds[next_serial++];
+    }
+}
+
+void *qdev_get_bus(DeviceState *dev)
+{
+    return dev->bus;
+}
+
+static DeviceProperty *find_prop(DeviceState *dev, const char *name)
+{
+    DeviceProperty *prop;
+
+    for (prop = dev->props; prop; prop = prop->next) {
+        if (strcmp(prop->name, name) == 0) {
+            return prop;
+        }
+    }
+    return NULL;
+}
+
+uint64_t qdev_get_prop_int(DeviceState *dev, const char *name, uint64_t def)
+{
+    DeviceProperty *prop;
+
+    prop = find_prop(dev, name);
+    if (!prop)
+        return def;
+
+    return prop->value.i;
+}
+
+void *qdev_get_prop_ptr(DeviceState *dev, const char *name)
+{
+    DeviceProperty *prop;
+
+    prop = find_prop(dev, name);
+    assert(prop);
+    return prop->value.ptr;
+}
+
+void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
+{
+    assert(dev->num_gpio_in == 0);
+    dev->num_gpio_in = n;
+    dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
+}
+
+void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
+{
+    assert(dev->num_gpio_out == 0);
+    dev->num_gpio_out = n;
+    dev->gpio_out = pins;
+}
+
+qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
+{
+    assert(n >= 0 && n < dev->num_gpio_in);
+    return dev->gpio_in[n];
+}
+
+void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
+{
+    assert(n >= 0 && n < dev->num_gpio_out);
+    dev->gpio_out[n] = pin;
+}
+
+static int next_block_unit[IF_COUNT];
+
+/* Get a block device.  This should only be used for single-drive devices
+   (e.g. SD/Floppy/MTD).  Multi-disk devices (scsi/ide) should use the
+   appropriate bus.  */
+BlockDriverState *qdev_init_bdrv(DeviceState *dev, BlockInterfaceType type)
+{
+    int unit = next_block_unit[type]++;
+    int index;
+
+    index = drive_get_index(type, 0, unit);
+    if (index == -1) {
+        return NULL;
+    }
+    return drives_table[index].bdrv;
+}