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36 /* VirtIO device IDs. */
37 #define VIRTIO_ID_NETWORK 0x01
38 #define VIRTIO_ID_BLOCK 0x02
39 #define VIRTIO_ID_CONSOLE 0x03
40 #define VIRTIO_ID_ENTROPY 0x04
41 #define VIRTIO_ID_BALLOON 0x05
42 #define VIRTIO_ID_IOMEMORY 0x06
43 #define VIRTIO_ID_9P 0x09
45 /* Status byte for guest to report progress. */
46 #define VIRTIO_CONFIG_STATUS_RESET 0x00
47 #define VIRTIO_CONFIG_STATUS_ACK 0x01
48 #define VIRTIO_CONFIG_STATUS_DRIVER 0x02
49 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
50 #define VIRTIO_CONFIG_STATUS_FAILED 0x80
53 * Generate interrupt when the virtqueue ring is
54 * completely used, even if we've suppressed them.
56 #define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
59 * The guest should never negotiate this feature; it
60 * is used to detect faulty drivers.
62 #define VIRTIO_F_BAD_FEATURE (1 << 30)
65 * Some VirtIO feature bits (currently bits 28 through 31) are
66 * reserved for the transport being used (eg. virtio_ring), the
67 * rest are per-device feature bits.
69 #define VIRTIO_TRANSPORT_F_START 28
70 #define VIRTIO_TRANSPORT_F_END 32
73 * Maximum number of virtqueues per device.
75 #define VIRTIO_MAX_VIRTQUEUES 8
78 * Each virtqueue indirect descriptor list must be physically contiguous.
79 * To allow us to malloc(9) each list individually, limit the number
80 * supported to what will fit in one page. With 4KB pages, this is a limit
81 * of 256 descriptors. If there is ever a need for more, we can switch to
82 * contigmalloc(9) for the larger allocations, similar to what
83 * bus_dmamem_alloc(9) does.
85 * Note the sizeof(struct vring_desc) is 16 bytes.
87 #define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
90 * VirtIO instance variables indices.
92 #define VIRTIO_IVAR_DEVTYPE 1
93 #define VIRTIO_IVAR_FEATURE_DESC 2
94 #define VIRTIO_IVAR_VENDOR 3
95 #define VIRTIO_IVAR_DEVICE 4
96 #define VIRTIO_IVAR_SUBVENDOR 5
97 #define VIRTIO_IVAR_SUBDEVICE 6
99 struct virtio_feature_desc {
104 const char *virtio_device_name(uint16_t devid);
105 void virtio_describe(device_t dev, const char *msg,
106 uint64_t features, struct virtio_feature_desc *feature_desc);
109 * VirtIO Bus Methods.
111 void virtio_read_ivar(device_t dev, int ivar, uintptr_t *val);
112 void virtio_write_ivar(device_t dev, int ivar, uintptr_t val);
113 uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
114 int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
115 struct vq_alloc_info *info);
116 int virtio_setup_intr(device_t dev, enum intr_type type);
117 int virtio_with_feature(device_t dev, uint64_t feature);
118 void virtio_stop(device_t dev);
119 int virtio_reinit(device_t dev, uint64_t features);
120 void virtio_reinit_complete(device_t dev);
123 * Read/write a variable amount from the device specific (ie, network)
124 * configuration region. This region is encoded in the same endian as
127 void virtio_read_device_config(device_t dev, bus_size_t offset,
128 void *dst, int length);
129 void virtio_write_device_config(device_t dev, bus_size_t offset,
130 void *src, int length);
132 /* Inlined device specific read/write functions for common lengths. */
133 #define VIRTIO_RDWR_DEVICE_CONFIG(size, type) \
135 __CONCAT(virtio_read_dev_config_,size)(device_t dev, \
139 virtio_read_device_config(dev, offset, &val, sizeof(type)); \
144 __CONCAT(virtio_write_dev_config_,size)(device_t dev, \
145 bus_size_t offset, type val) \
147 virtio_write_device_config(dev, offset, &val, sizeof(type)); \
150 VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
151 VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
152 VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
154 #define VIRTIO_READ_IVAR(name, ivar) \
156 __CONCAT(virtio_get_,name)(device_t dev) \
159 virtio_read_ivar(dev, ivar, &val); \
160 return ((int) val); \
163 VIRTIO_READ_IVAR(device_type, VIRTIO_IVAR_DEVTYPE);
164 VIRTIO_READ_IVAR(vendor, VIRTIO_IVAR_VENDOR);
165 VIRTIO_READ_IVAR(device, VIRTIO_IVAR_DEVICE);
166 VIRTIO_READ_IVAR(subvendor, VIRTIO_IVAR_SUBVENDOR);
167 VIRTIO_READ_IVAR(subdevice, VIRTIO_IVAR_SUBDEVICE);
169 #define VIRTIO_WRITE_IVAR(name, ivar) \
171 __CONCAT(virtio_set_,name)(device_t dev, void *val) \
173 virtio_write_ivar(dev, ivar, (uintptr_t) val); \
176 VIRTIO_WRITE_IVAR(feature_desc, VIRTIO_IVAR_FEATURE_DESC);
178 #endif /* _VIRTIO_H_ */