diff options
Diffstat (limited to 'OvmfPkg/Library/XenConsoleSerialPortLib/XenConsoleSerialPortLib.c')
| -rw-r--r-- | OvmfPkg/Library/XenConsoleSerialPortLib/XenConsoleSerialPortLib.c | 207 |
1 files changed, 0 insertions, 207 deletions
diff --git a/OvmfPkg/Library/XenConsoleSerialPortLib/XenConsoleSerialPortLib.c b/OvmfPkg/Library/XenConsoleSerialPortLib/XenConsoleSerialPortLib.c deleted file mode 100644 index 4ccb38d585..0000000000 --- a/OvmfPkg/Library/XenConsoleSerialPortLib/XenConsoleSerialPortLib.c +++ /dev/null @@ -1,207 +0,0 @@ -/** @file
- Xen console SerialPortLib instance
-
- Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
-
- This program and the accompanying materials
- are licensed and made available under the terms and conditions of the BSD License
- which accompanies this distribution. The full text of the license may be found at
- http://opensource.org/licenses/bsd-license.php
-
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-
-**/
-
-#include <Base.h>
-#include <Uefi/UefiBaseType.h>
-
-#include <Library/BaseLib.h>
-#include <Library/SerialPortLib.h>
-#include <Library/XenHypercallLib.h>
-
-#include <IndustryStandard/Xen/io/console.h>
-#include <IndustryStandard/Xen/hvm/params.h>
-#include <IndustryStandard/Xen/event_channel.h>
-
-//
-// We can't use DebugLib due to a constructor dependency cycle between DebugLib
-// and ourselves.
-//
-#define ASSERT(Expression) \
- do { \
- if (!(Expression)) { \
- CpuDeadLoop (); \
- } \
- } while (FALSE)
-
-//
-// The code below expects these global variables to be mutable, even in the case
-// that we have been incorporated into SEC or PEIM phase modules (which is
-// allowed by our INF description). While this is a dangerous assumption to make
-// in general, it is actually fine for the Xen domU (guest) environment that
-// this module is intended for, as UEFI always executes from DRAM in that case.
-//
-STATIC evtchn_send_t mXenConsoleEventChain;
-STATIC struct xencons_interface *mXenConsoleInterface;
-
-/**
- Initialize the serial device hardware.
-
- If no initialization is required, then return RETURN_SUCCESS.
- If the serial device was successfully initialized, then return RETURN_SUCCESS.
- If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
-
- @retval RETURN_SUCCESS The serial device was initialized.
- @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
-
-**/
-RETURN_STATUS
-EFIAPI
-SerialPortInitialize (
- VOID
- )
-{
- if (! XenHypercallIsAvailable ()) {
- return RETURN_DEVICE_ERROR;
- }
-
- if (!mXenConsoleInterface) {
- mXenConsoleEventChain.port = (UINT32)XenHypercallHvmGetParam (HVM_PARAM_CONSOLE_EVTCHN);
- mXenConsoleInterface = (struct xencons_interface *)(UINTN)
- (XenHypercallHvmGetParam (HVM_PARAM_CONSOLE_PFN) << EFI_PAGE_SHIFT);
-
- //
- // No point in ASSERT'ing here as we won't be seeing the output
- //
- }
- return RETURN_SUCCESS;
-}
-
-/**
- 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;
-}
-
-/**
- Polls a serial device to see if there is any data waiting to be read.
-
- @retval TRUE Data is waiting to be read from the serial device.
- @retval FALSE There is no data waiting to be read from the serial device.
-
-**/
-BOOLEAN
-EFIAPI
-SerialPortPoll (
- VOID
- )
-{
- return mXenConsoleInterface &&
- mXenConsoleInterface->in_cons != mXenConsoleInterface->in_prod;
-}
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