root / hw / qdev.c @ 6f68ecb2
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/*
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* Dynamic device configuration and creation.
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*
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* Copyright (c) 2009 CodeSourcery
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
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*/
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/* The theory here is that it should be possible to create a machine without
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knowledge of specific devices. Historically board init routines have
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passed a bunch of arguments to each device, requiring the board know
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exactly which device it is dealing with. This file provides an abstract
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API for device configuration and initialization. Devices will generally
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inherit from a particular bus (e.g. PCI or I2C) rather than
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this API directly. */
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#include "qdev.h" |
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#include "sysemu.h" |
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struct DeviceProperty {
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const char *name; |
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union {
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int i;
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void *ptr;
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} value; |
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DeviceProperty *next; |
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}; |
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struct DeviceType {
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const char *name; |
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qdev_initfn init; |
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void *opaque;
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int size;
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DeviceType *next; |
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}; |
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struct ChildBusList {
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const char *name; |
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void *ptr;
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ChildBusList *next; |
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}; |
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static DeviceType *device_type_list;
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/* Register a new device type. */
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DeviceType *qdev_register(const char *name, int size, qdev_initfn init, |
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void *opaque)
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{ |
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DeviceType *t; |
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assert(size >= sizeof(DeviceState));
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t = qemu_mallocz(sizeof(DeviceType));
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t->next = device_type_list; |
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device_type_list = t; |
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t->name = qemu_strdup(name); |
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t->size = size; |
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t->init = init; |
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t->opaque = opaque; |
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return t;
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} |
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/* Create a new device. This only initializes the device state structure
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and allows properties to be set. qdev_init should be called to
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initialize the actual device emulation. */
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DeviceState *qdev_create(void *bus, const char *name) |
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{ |
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DeviceType *t; |
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DeviceState *dev; |
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for (t = device_type_list; t; t = t->next) {
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if (strcmp(t->name, name) == 0) { |
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break;
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} |
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} |
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if (!t) {
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fprintf(stderr, "Unknown device '%s'\n", name);
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exit(1);
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} |
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dev = qemu_mallocz(t->size); |
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dev->name = name; |
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dev->type = t; |
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dev->bus = bus; |
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return dev;
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} |
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/* Initialize a device. Device properties should be set before calling
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this function. IRQs and MMIO regions should be connected/mapped after
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calling this function. */
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void qdev_init(DeviceState *dev)
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{ |
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dev->type->init(dev, dev->type->opaque); |
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} |
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static DeviceProperty *create_prop(DeviceState *dev, const char *name) |
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{ |
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DeviceProperty *prop; |
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/* TODO: Check for duplicate properties. */
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prop = qemu_mallocz(sizeof(*prop));
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prop->name = qemu_strdup(name); |
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prop->next = dev->props; |
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dev->props = prop; |
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return prop;
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} |
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void qdev_set_prop_int(DeviceState *dev, const char *name, int value) |
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{ |
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DeviceProperty *prop; |
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prop = create_prop(dev, name); |
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prop->value.i = value; |
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} |
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void qdev_set_prop_ptr(DeviceState *dev, const char *name, void *value) |
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{ |
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DeviceProperty *prop; |
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prop = create_prop(dev, name); |
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prop->value.ptr = value; |
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} |
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qemu_irq qdev_get_irq_sink(DeviceState *dev, int n)
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{ |
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assert(n >= 0 && n < dev->num_irq_sink);
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return dev->irq_sink[n];
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} |
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/* Register device IRQ sinks. */
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void qdev_init_irq_sink(DeviceState *dev, qemu_irq_handler handler, int nirq) |
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{ |
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dev->num_irq_sink = nirq; |
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dev->irq_sink = qemu_allocate_irqs(handler, dev, nirq); |
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} |
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/* Get a character (serial) device interface. */
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CharDriverState *qdev_init_chardev(DeviceState *dev) |
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{ |
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static int next_serial; |
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static int next_virtconsole; |
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/* FIXME: This is a nasty hack that needs to go away. */
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if (strncmp(dev->name, "virtio", 6) == 0) { |
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return virtcon_hds[next_virtconsole++];
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} else {
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return serial_hds[next_serial++];
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} |
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} |
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void *qdev_get_bus(DeviceState *dev)
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{ |
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return dev->bus;
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} |
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static DeviceProperty *find_prop(DeviceState *dev, const char *name) |
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{ |
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DeviceProperty *prop; |
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for (prop = dev->props; prop; prop = prop->next) {
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if (strcmp(prop->name, name) == 0) { |
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return prop;
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} |
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} |
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return NULL; |
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} |
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uint64_t qdev_get_prop_int(DeviceState *dev, const char *name, uint64_t def) |
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{ |
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DeviceProperty *prop; |
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prop = find_prop(dev, name); |
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if (!prop)
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return def;
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return prop->value.i;
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} |
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void *qdev_get_prop_ptr(DeviceState *dev, const char *name) |
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{ |
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DeviceProperty *prop; |
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prop = find_prop(dev, name); |
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assert(prop); |
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return prop->value.ptr;
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} |
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void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n) |
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{ |
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assert(dev->num_gpio_in == 0);
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dev->num_gpio_in = n; |
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dev->gpio_in = qemu_allocate_irqs(handler, dev, n); |
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} |
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void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n) |
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{ |
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assert(dev->num_gpio_out == 0);
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dev->num_gpio_out = n; |
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dev->gpio_out = pins; |
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} |
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qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
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{ |
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assert(n >= 0 && n < dev->num_gpio_in);
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return dev->gpio_in[n];
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} |
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void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin) |
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{ |
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assert(n >= 0 && n < dev->num_gpio_out);
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dev->gpio_out[n] = pin; |
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} |
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static int next_block_unit[IF_COUNT]; |
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/* Get a block device. This should only be used for single-drive devices
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(e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
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appropriate bus. */
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BlockDriverState *qdev_init_bdrv(DeviceState *dev, BlockInterfaceType type) |
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{ |
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int unit = next_block_unit[type]++;
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int index;
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index = drive_get_index(type, 0, unit);
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if (index == -1) { |
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return NULL; |
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} |
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return drives_table[index].bdrv;
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} |
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void *qdev_get_child_bus(DeviceState *dev, const char *name) |
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{ |
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ChildBusList *bus; |
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for (bus = dev->child_bus; bus; bus = bus->next) {
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if (strcmp(name, bus->name) == 0) { |
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return bus->ptr;
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} |
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} |
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return NULL; |
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} |
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void qdev_attach_child_bus(DeviceState *dev, const char *name, void *bus) |
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{ |
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ChildBusList *p; |
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assert(!qdev_get_child_bus(dev, name)); |
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p = qemu_mallocz(sizeof(*p));
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p->name = qemu_strdup(name); |
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p->ptr = bus; |
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p->next = dev->child_bus; |
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dev->child_bus = p; |
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} |
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static int next_scsi_bus; |
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/* Create a scsi bus, and attach devices to it. */
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/* TODO: Actually create a scsi bus for hotplug to use. */
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void scsi_bus_new(DeviceState *host, SCSIAttachFn attach)
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{ |
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int bus = next_scsi_bus++;
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int unit;
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int index;
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for (unit = 0; unit < MAX_SCSI_DEVS; unit++) { |
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index = drive_get_index(IF_SCSI, bus, unit); |
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if (index == -1) { |
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continue;
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} |
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attach(host, drives_table[index].bdrv, unit); |
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} |
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} |