UINT32
EFIAPI
XenBusEventChannelAllocate (
IN XENBUS_PROTOCOL *This,
IN domid_t DomainId,
OUT evtchn_port_t *Port
)
{
XENBUS_PRIVATE_DATA *Private;
evtchn_alloc_unbound_t Parameter;
UINT32 ReturnCode;
Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
Parameter.dom = DOMID_SELF;
Parameter.remote_dom = DomainId;
ReturnCode = (UINT32)XenHypercallEventChannelOp (Private->Dev,
EVTCHNOP_alloc_unbound,
&Parameter);
if (ReturnCode != 0) {
DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));
return ReturnCode;
}
*Port = Parameter.port;
return ReturnCode;
}
UINT32
XenEventChannelNotify (
IN XENBUS_DEVICE *Dev,
IN evtchn_port_t Port
)
{
INTN ReturnCode;
evtchn_send_t Send;
Send.port = Port;
ReturnCode = XenHypercallEventChannelOp (Dev, EVTCHNOP_send, &Send);
return (UINT32)ReturnCode;
}
UINT32
EFIAPI
XenBusEventChannelClose (
IN XENBUS_PROTOCOL *This,
IN evtchn_port_t Port
)
{
XENBUS_PRIVATE_DATA *Private;
evtchn_close_t Close;
Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
Close.port = Port;
return (UINT32)XenHypercallEventChannelOp (Private->Dev, EVTCHNOP_close, &Close);
}
/**
Write data from buffer to serial device.
Writes NumberOfBytes data bytes from Buffer to the serial device.
The number of bytes actually written to the serial device is returned.
If the return value is less than NumberOfBytes, then the write operation failed.
If Buffer is NULL, then ASSERT().
If NumberOfBytes is zero, then return 0.
@param Buffer Pointer to the data buffer to be written.
@param NumberOfBytes Number of bytes to written to the serial device.
@retval 0 NumberOfBytes is 0.
@retval >0 The number of bytes written to the serial device.
If this value is less than NumberOfBytes, then the write operation failed.
**/
UINTN
EFIAPI
SerialPortWrite (
IN UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
XENCONS_RING_IDX Consumer, Producer;
UINTN Sent;
ASSERT (Buffer != NULL);
if (NumberOfBytes == 0) {
return 0;
}
if (!mXenConsoleInterface) {
return 0;
}
Sent = 0;
do {
Consumer = mXenConsoleInterface->out_cons;
Producer = mXenConsoleInterface->out_prod;
MemoryFence ();
while (Sent < NumberOfBytes && ((Producer - Consumer) < sizeof (mXenConsoleInterface->out)))
mXenConsoleInterface->out[MASK_XENCONS_IDX(Producer++, mXenConsoleInterface->out)] = Buffer[Sent++];
MemoryFence ();
mXenConsoleInterface->out_prod = Producer;
XenHypercallEventChannelOp (EVTCHNOP_send, &mXenConsoleEventChain);
} while (Sent < NumberOfBytes);
return Sent;
}
/**
Read data from serial device and save the datas in buffer.
Reads NumberOfBytes data bytes from a serial device into the buffer
specified by Buffer. The number of bytes actually read is returned.
If Buffer is NULL, then ASSERT().
If NumberOfBytes is zero, then return 0.
@param Buffer Pointer to the data buffer to store the data read from the serial device.
@param NumberOfBytes Number of bytes which will be read.
@retval 0 Read data failed, no data is to be read.
@retval >0 Actual number of bytes read from serial device.
**/
UINTN
EFIAPI
SerialPortRead (
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
XENCONS_RING_IDX Consumer, Producer;
UINTN Received;
ASSERT (Buffer != NULL);
if (NumberOfBytes == 0) {
return 0;
}
if (!mXenConsoleInterface) {
return 0;
}
Consumer = mXenConsoleInterface->in_cons;
Producer = mXenConsoleInterface->in_prod;
MemoryFence ();
Received = 0;
while (Received < NumberOfBytes && Consumer < Producer)
Buffer[Received++] = mXenConsoleInterface->in[MASK_XENCONS_IDX(Consumer++, mXenConsoleInterface->in)];
MemoryFence ();
mXenConsoleInterface->in_cons = Consumer;
XenHypercallEventChannelOp (EVTCHNOP_send, &mXenConsoleEventChain);
return Received;
}
