L4 specific VIRTIO Transport layer.
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namespace | L4virtio |
| L4-VIRTIO Transport C++ API.
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enum | L4_virtio_protocol |
| L4-VIRTIO protocol number.
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enum | L4_virtio_opcodes {
L4VIRTIO_OP_SET_STATUS = 0
, L4VIRTIO_OP_CONFIG_QUEUE = 1
, L4VIRTIO_OP_REGISTER_DS = 3
, L4VIRTIO_OP_DEVICE_CONFIG = 4
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L4VIRTIO_OP_GET_DEVICE_IRQ = 5
} |
| Opcodes to setup and configure a device. More...
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enum | L4virtio_device_ids {
L4VIRTIO_ID_NET = 1
, L4VIRTIO_ID_BLOCK = 2
, L4VIRTIO_ID_CONSOLE = 3
, L4VIRTIO_ID_RNG = 4
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L4VIRTIO_ID_BALLOON = 5
, L4VIRTIO_ID_RPMSG = 7
, L4VIRTIO_ID_SCSI = 8
, L4VIRTIO_ID_9P = 9
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L4VIRTIO_ID_RPROC_SERIAL = 11
, L4VIRTIO_ID_CAIF = 12
, L4VIRTIO_ID_GPU = 16
, L4VIRTIO_ID_INPUT = 18
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L4VIRTIO_ID_VSOCK = 19
, L4VIRTIO_ID_CRYPTO = 20
, L4VIRTIO_ID_FS = 26
, L4VIRTIO_ID_SCMI = 32
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L4VIRTIO_ID_SOCK = 0x9999
} |
| Virtio device IDs as reported in the driver's config space. More...
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enum | L4virtio_device_status {
L4VIRTIO_STATUS_ACKNOWLEDGE = 1
, L4VIRTIO_STATUS_DRIVER = 2
, L4VIRTIO_STATUS_DRIVER_OK = 4
, L4VIRTIO_STATUS_FEATURES_OK = 8
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L4VIRTIO_STATUS_DEVICE_NEEDS_RESET = 0x40
, L4VIRTIO_STATUS_FAILED = 0x80
} |
| Virtio device status bits. More...
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enum | L4virtio_feature_bits { L4VIRTIO_FEATURE_VERSION_1 = 32
, L4VIRTIO_FEATURE_CMD_CONFIG = 160
} |
| L4virtio-specific feature bits. More...
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enum | L4_virtio_irq_status { L4VIRTIO_IRQ_STATUS_VRING = 1
, L4VIRTIO_IRQ_STATUS_CONFIG = 2
} |
| VIRTIO IRQ status codes (l4virtio_config_hdr_t::irq_status). More...
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enum | L4_virtio_cmd {
L4VIRTIO_CMD_NONE = 0x00000000
, L4VIRTIO_CMD_SET_STATUS = 0x01000000
, L4VIRTIO_CMD_CFG_QUEUE = 0x02000000
, L4VIRTIO_CMD_CFG_CHANGED = 0x04000000
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L4VIRTIO_CMD_NOTIFY_QUEUE = 0x08000000
, L4VIRTIO_CMD_MASK = 0xff000000
} |
| Virtio commands for device configuration. More...
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l4virtio_config_queue_t * | l4virtio_config_queues (l4virtio_config_hdr_t const *cfg) |
| Get the pointer to the first queue config.
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void * | l4virtio_device_config (l4virtio_config_hdr_t const *cfg) |
| Get the pointer to the device configuration.
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void | l4virtio_set_feature (l4_uint32_t *feature_map, unsigned feat) |
| Set the given feature bit in a feature map.
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void | l4virtio_clear_feature (l4_uint32_t *feature_map, unsigned feat) |
| Clear the given feature bit in a feature map.
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unsigned | l4virtio_get_feature (l4_uint32_t *feature_map, unsigned feat) |
| Check if the given bit in a feature map is set.
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int | l4virtio_set_status (l4_cap_idx_t cap, unsigned status) L4_NOTHROW |
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int | l4virtio_config_queue (l4_cap_idx_t cap, unsigned queue) L4_NOTHROW |
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int | l4virtio_register_ds (l4_cap_idx_t cap, l4_cap_idx_t ds_cap, l4_uint64_t base, l4_umword_t offset, l4_umword_t size) L4_NOTHROW |
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int | l4virtio_device_config_ds (l4_cap_idx_t cap, l4_cap_idx_t config_ds, l4_addr_t *ds_offset) L4_NOTHROW |
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int | l4virtio_device_notification_irq (l4_cap_idx_t cap, unsigned index, l4_cap_idx_t irq) L4_NOTHROW |
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L4 specific VIRTIO Transport layer.
The L4 specific VIRTIO Transport layer is based on L4Re::Dataspace as shared memory and L4::Irq for signaling. The VIRTIO configuration space is mostly based on a shared memory implementation too and accompanied by two IPC functions to synchronize the configuration between device and driver.
◆ l4virtio_config_queue_t
Queue configuration entry.
An array of such entries is available at the l4virtio_config_hdr_t::queues_offset in the config data space.
Consistency rules for the queue config are:
- A driver might read
num_max
at any time.
- A driver must write to
num
, desc_addr
, avail_addr
, and used_addr
only when ready
is zero (0). Values in these fields are validated and used by the device only after successfully setting ready
to one (1), either by the IPC or by L4VIRTIO_CMD_CFG_QUEUE.
- The value of
device_notify_index
is valid only when ready
is one.
- The driver might write to
device_notify_index
at any time, however the change is guaranteed to take effect after a successful L4VIRTIO_CMD_CFG_QUEUE or after a config_queue IPC. Note, the change might also have immediate effect, depending on the device implementation.
◆ L4_virtio_cmd
Virtio commands for device configuration.
Enumerator |
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L4VIRTIO_CMD_NONE | No command pending.
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L4VIRTIO_CMD_SET_STATUS | Set the status register.
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L4VIRTIO_CMD_CFG_QUEUE | Configure a queue.
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L4VIRTIO_CMD_CFG_CHANGED | Device config changed.
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L4VIRTIO_CMD_NOTIFY_QUEUE | Configure a queue.
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L4VIRTIO_CMD_MASK | Mask to get command bits.
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Definition at line 116 of file virtio.h.
◆ L4_virtio_irq_status
VIRTIO IRQ status codes (l4virtio_config_hdr_t::irq_status).
- Note
- l4virtio_config_hdr_t::irq_status is currently unused.
Enumerator |
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L4VIRTIO_IRQ_STATUS_VRING | VRING IRQ pending flag.
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L4VIRTIO_IRQ_STATUS_CONFIG | CONFIG IRQ pending flag.
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Definition at line 107 of file virtio.h.
◆ L4_virtio_opcodes
Opcodes to setup and configure a device.
Enumerator |
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L4VIRTIO_OP_SET_STATUS | Write device status register.
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L4VIRTIO_OP_CONFIG_QUEUE | Configure queue.
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L4VIRTIO_OP_REGISTER_DS | Register shared memory with device.
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L4VIRTIO_OP_DEVICE_CONFIG | Get device config page.
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L4VIRTIO_OP_GET_DEVICE_IRQ | Retrieve device notification IRQ.
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Definition at line 51 of file virtio.h.
◆ L4virtio_device_ids
Virtio device IDs as reported in the driver's config space.
Enumerator |
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L4VIRTIO_ID_NET | Virtual ethernet card.
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L4VIRTIO_ID_BLOCK | General block device.
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L4VIRTIO_ID_CONSOLE | Simple device for data IO via ports.
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L4VIRTIO_ID_RNG | Entropy source.
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L4VIRTIO_ID_BALLOON | Memory ballooning device.
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L4VIRTIO_ID_RPMSG | Device using rpmsg protocol.
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L4VIRTIO_ID_SCSI | SCSI host device.
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L4VIRTIO_ID_9P | Device using 9P transport protocol.
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L4VIRTIO_ID_RPROC_SERIAL | Rproc serial device.
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L4VIRTIO_ID_CAIF | Device using CAIF network protocol.
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L4VIRTIO_ID_GPU | GPU.
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L4VIRTIO_ID_INPUT | Input.
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L4VIRTIO_ID_VSOCK | Vsock transport.
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L4VIRTIO_ID_CRYPTO | Crypto.
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L4VIRTIO_ID_FS | FS.
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L4VIRTIO_ID_SCMI | Scmi device.
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L4VIRTIO_ID_SOCK | Unofficial socket device.
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Definition at line 61 of file virtio.h.
◆ L4virtio_device_status
Virtio device status bits.
Enumerator |
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L4VIRTIO_STATUS_ACKNOWLEDGE | Guest OS has found device.
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L4VIRTIO_STATUS_DRIVER | Guest OS knows how to drive device.
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L4VIRTIO_STATUS_DRIVER_OK | Driver is set up.
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L4VIRTIO_STATUS_FEATURES_OK | Driver has acknowledged feature set.
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L4VIRTIO_STATUS_DEVICE_NEEDS_RESET | Device detected fatal error.
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L4VIRTIO_STATUS_FAILED | Driver detected fatal error.
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Definition at line 84 of file virtio.h.
◆ L4virtio_feature_bits
L4virtio-specific feature bits.
Enumerator |
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L4VIRTIO_FEATURE_VERSION_1 | Virtio protocol version 1 supported. Must be 1 for L4virtio.
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L4VIRTIO_FEATURE_CMD_CONFIG | Status and queue config are set via cmd field instead of via IPC.
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Definition at line 95 of file virtio.h.
◆ l4virtio_config_queue()
int l4virtio_config_queue |
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l4_cap_idx_t |
cap, |
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unsigned |
queue |
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- Parameters
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cap | Capability to the VIRTIO host. |
Trigger queue configuration of the given queue.
Usually all queues are configured when the status is written to running. However, in some cases queues shall be disabled or enabled dynamically, in this case this function triggers a reconfiguration from the shared memory register of the queue config.
- Parameters
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queue | Queue index for the queue to be configured. |
- Return values
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0 | on success. |
-L4_EIO | The queue's status is invalid. |
-L4_ERANGE | The queue index exceeds the number of queues. |
-L4_EINVAL | Otherwise. |
◆ l4virtio_config_queues()
◆ l4virtio_device_config()
Get the pointer to the device configuration.
- Parameters
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cfg | Pointer to the config header. |
- Returns
- pointer to device configuration structure.
Definition at line 260 of file virtio.h.
◆ l4virtio_device_config_ds()
- Parameters
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cap | Capability to the L4-VIRTIO host |
Get the dataspace with the L4virtio configuration page.
- Parameters
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config_ds | Capability for receiving the dataspace capability for the shared L4-VIRTIO config data space. |
ds_offset | Offset into the dataspace where the device configuration structure starts. |
◆ l4virtio_device_notification_irq()
- Parameters
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cap | Capability to the L4-VIRTIO host |
Get the notification interrupt corresponding to the given index.
- Parameters
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| index | Index of the interrupt. |
[out] | irq | Triggerable for the given index. |
- Return values
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L4_EOK | Success. |
L4_ENOSYS | IRQ notification not supported by device. |
<0 | Other error. |
An index is only guaranteed to return an IRQ object when the index is set in one of the device notify index fields. The device must return the same interrupt for a given index as long as the index is in use. If an index disappears as a result of a configuration change and then is reused later, the interrupt is not guaranteed to be the same.
Interrupts must always be rerequested after a device reset.
◆ l4virtio_register_ds()
- Parameters
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cap | Capability to the VIRTIO host |
Register a shared data space with VIRTIO host.
- Parameters
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ds_cap | Dataspace capability to register. The lower 8 bits determine the rights mask with which the guest's rights are masked during the registration of the dataspace at the VIRTIO host. |
base | VIRTIO guest physical start address of shared memory region |
offset | Offset within the data space that is attached to the given base in the guest physical memory. |
size | Size of the memory region in the guest |
- Return values
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L4_EOK | Operation successful. |
-L4_EINVAL | The ds_cap capability is invalid, does not refer to a valid dataspace, is not a trusted dataspace if trusted dataspace validation is enabled, or size and offset specify an invalid region. |
-L4_ENOMEM | The limit of dataspaces that can be registered has been reached or no capability slot could be allocated. |
-L4_ERANGE | offset is lager than the size of the dataspace. |
<0 | Any error returned by the dataspace when queried for information during setup or any error returned by the region manager from attaching the dataspace. |
◆ l4virtio_set_status()
int l4virtio_set_status |
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l4_cap_idx_t |
cap, |
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unsigned |
status |
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- Parameters
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cap | Capability to the VIRTIO host |
Write the VIRTIO status register.
- Parameters
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status | Status word to write to the VIRTIO status. |
- Return values
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- Note
- All other registers are accessed via shared memory.