These are implementations of SerialPortLib using SBI console services.
- BaseSerialPortLibRiscVSbiLib is appropriate for SEC/PEI (XIP) environments
- BaseSerialPortLibRiscVSbiLibRam is appropriate for PrePI/DXE environments
Tested with:
- Qemu RiscVVirt (non-DBCN case, backed by UART)
- TinyEMU + RiscVVirt (non-DBCN case, HTIF)
- TinyEMU + RiscVVirt (DBCN case, HTIF)
Cc: Daniel Schaefer <g...@danielschaefer.me>
Cc: Sunil V L <suni...@ventanamicro.com>
Cc: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Liming Gao <gaolim...@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang....@intel.com>
Acked-by: Gerd Hoffmann <kra...@redhat.com>
Signed-off-by: Andrei Warkentin <andrei.warken...@intel.com>
---
MdePkg/MdePkg.dsc
| 2 +
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.inf
| 41 +++
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.inf
| 38 +++
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.h
| 41 +++
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.c
| 208 ++++++++++++++
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.c
| 289 ++++++++++++++++++++
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.c
| 132 +++++++++
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.uni
| 16 ++
8 files changed, 767 insertions(+)
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 0ac7618b4623..a810ad0d147d 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -192,5 +192,7 @@ [Components.ARM, Components.AARCH64]
[Components.RISCV64]
MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
+ MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.inf
+
MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.inf
[BuildOptions]
diff --git
a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.inf
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.inf
new file mode 100644
index 000000000000..2340ac6bfe67
--- /dev/null
+++
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.inf
@@ -0,0 +1,41 @@
+## @file
+# Serial Port Library backed by SBI console.
+#
+# Meant for SEC and PEI (XIP) environments.
+#
+# Due to limitations of SBI console interface and XIP environments
+# (on use of globals), this library instance does not implement reading
+# and polling the serial port. See PrePiDxeSerialPortLibRiscVSbiRam.inf
+# for the full-featured variant meant for PrePi and DXE environments.
+#
+# Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = BaseSerialPortLibRiscVSbiLib
+ MODULE_UNI_FILE = BaseSerialPortLibRiscVSbiLib.uni
+ FILE_GUID = 639fad38-4bfd-4eb9-9f09-e97c7947d480
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = SerialPortLib | SEC PEI_CORE PEIM
+
+
+#
+# VALID_ARCHITECTURES = RISCV64
+#
+
+[Sources]
+ BaseSerialPortLibRiscVSbiLib.c
+ Common.c
+ Common.h
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ RiscVSbiLib
diff --git
a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.inf
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.inf
new file mode 100644
index 000000000000..d09573ca5b36
--- /dev/null
+++
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.inf
@@ -0,0 +1,38 @@
+## @file
+# Serial Port Library backed by SBI console.
+#
+# Meant for PrePi and DXE environments (where globals are allowed). See
+# BaseSerialPortLibRiscVSbiLib.inf for a reduced variant appropriate
+# for SEC and PEI (XIP) environments.
+#
+# Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = BaseSerialPortLibRiscVSbiLibRam
+ MODULE_UNI_FILE = BaseSerialPortLibRiscVSbiLib.uni
+ FILE_GUID = 872af743-ab56-45b4-a065-602567f4820c
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = SerialPortLib | SEC DXE_CORE DXE_DRIVER
DXE_RUNTIME_DRIVER UEFI_DRIVER UEFI_APPLICATION
+
+
+#
+# VALID_ARCHITECTURES = RISCV64
+#
+
+[Sources]
+ BaseSerialPortLibRiscVSbiLibRam.c
+ Common.c
+ Common.h
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[LibraryClasses]
+ RiscVSbiLib
diff --git a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.h
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.h
new file mode 100644
index 000000000000..98c1a5d3865e
--- /dev/null
+++ b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.h
@@ -0,0 +1,41 @@
+/** @file
+ Serial Port Library backed by SBI console.
+
+ Common functionality shared by PrePiDxeSerialPortLibRiscVSbi and
+ PrePiDxeSerialPortLibRiscVSbiRam implementations.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef SERIAL_PORT_SBI_COMMON_H_
+#define SERIAL_PORT_SBI_COMMON_H_
+
+#include <Base.h>
+#include <Library/SerialPortLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+
+BOOLEAN
+SbiImplementsDbcn (
+ VOID
+ );
+
+BOOLEAN
+SbiImplementsLegacyPutchar (
+ VOID
+ );
+
+UINTN
+SbiLegacyPutchar (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ );
+
+UINTN
+SbiDbcnWrite (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ );
+
+#endif /* SERIAL_PORT_SBI_COMMON_H_ */
diff --git
a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.c
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.c
new file mode 100644
index 000000000000..f4f2959cf8cc
--- /dev/null
+++ b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.c
@@ -0,0 +1,208 @@
+/** @file
+ Serial Port Library backed by SBI console.
+
+ Meant for SEC and PEI (XIP) environments.
+
+ Due to limitations of SBI console interface and XIP environments
+ (on use of globals), this library instance does not implement reading
+ and polling the serial port. See BaseSerialPortLibRiscVSbiLibRam.c for
+ the full-featured variant meant for PrePi and DXE environments.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "Common.h"
+
+/**
+ 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
+ )
+{
+ 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 NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to be written.
+ @param NumberOfBytes The 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
+ )
+{
+ if (NumberOfBytes == 0) {
+ return 0;
+ }
+
+ if (SbiImplementsDbcn ()) {
+ return SbiDbcnWrite (Buffer, NumberOfBytes);
+ }
+
+ if (SbiImplementsLegacyPutchar ()) {
+ return SbiLegacyPutchar (Buffer, NumberOfBytes);
+ }
+
+ /*
+ * Neither DBCN or legacy extension were present.
+ */
+ return 0;
+}
+
+/**
+ 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 the return value is less than NumberOfBytes, then the rest operation
failed.
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to store the data
read from the serial device.
+ @param NumberOfBytes The number of bytes which will be read.
+
+ @retval 0 Read data failed; No data is to be read.
+ @retval >0 The actual number of bytes read from serial device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+ OUT UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ return 0;
+}
+
+/**
+ Polls a serial device to see if there is any data waiting to be read.
+
+ Polls a serial device to see if there is any data waiting to be read.
+ If there is data waiting to be read from the serial device, then TRUE is
returned.
+ If there is no data waiting to be read from the serial device, then FALSE is
returned.
+
+ @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 FALSE;
+}
+
+/**
+ Sets the control bits on a serial device.
+
+ @param Control Sets the bits of Control that are settable.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ return RETURN_SUCCESS;
+}
+
+/**
+ Retrieve the status of the control bits on a serial device.
+
+ @param Control A pointer to return the current control
signals from the serial device.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+ *Control = 0;
+ return RETURN_SUCCESS;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0
will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReveiveFifoDepth The requested depth of the FIFO on the receive
side of the
+ serial interface. A ReceiveFifoDepth value of 0
will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in
microseconds.
+ This timeout applies to both the transmit and
receive side of the
+ interface. A Timeout value of 0 will use the
device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A
Parity value of
+ DefaultParity will use the device's default parity
value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial
device. A DataBits
+ vaule of 0 will use the device's default data bit
setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial
device. A StopBits
+ value of DefaultStopBits will use the device's
default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an
unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning
correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ return RETURN_SUCCESS;
+}
diff --git
a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.c
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.c
new file mode 100644
index 000000000000..fafba87b7cd1
--- /dev/null
+++
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.c
@@ -0,0 +1,289 @@
+/** @file
+ Serial Port Library backed by SBI console.
+
+ Meant for PrePi and DXE environments (where globals are allowed). See
+ BaseSerialPortLibRiscVSbiLib.c for a reduced variant appropriate for
+ SEC and PEI (XIP) environments.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Base.h>
+#include <Library/SerialPortLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+#include "Common.h"
+
+STATIC BOOLEAN mHaveDbcn = FALSE;
+STATIC BOOLEAN mHaveLegacyPutchar = FALSE;
+STATIC BOOLEAN mHaveLegacyGetchar = FALSE;
+STATIC INT64 mLastGetChar = -1;
+
+/**
+ Return whether the legacy console getchar extension is implemented.
+
+ @retval TRUE Extension is implemented.
+ @retval FALSE Extension is not implemented.
+
+**/
+STATIC
+BOOLEAN
+SbiImplementsLegacyGetchar (
+ VOID
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1,
SBI_EXT_0_1_CONSOLE_GETCHAR);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/**
+ 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 (SbiImplementsDbcn ()) {
+ mHaveDbcn = TRUE;
+ return RETURN_SUCCESS;
+ }
+
+ if (SbiImplementsLegacyPutchar ()) {
+ mHaveLegacyPutchar = TRUE;
+ }
+
+ if (SbiImplementsLegacyGetchar ()) {
+ mHaveLegacyGetchar = TRUE;
+ }
+
+ return (mHaveLegacyGetchar && mHaveLegacyPutchar) ?
+ RETURN_SUCCESS :
+ RETURN_DEVICE_ERROR;
+}
+
+/**
+ 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 NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to be written.
+ @param NumberOfBytes The 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
+ )
+{
+ if (NumberOfBytes == 0) {
+ return 0;
+ }
+
+ if (mHaveDbcn) {
+ return SbiDbcnWrite (Buffer, NumberOfBytes);
+ } else if (mHaveLegacyPutchar) {
+ return SbiLegacyPutchar (Buffer, NumberOfBytes);
+ }
+
+ /*
+ * Neither DBCN or legacy extension were present.
+ */
+ return 0;
+}
+
+/**
+ 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 the return value is less than NumberOfBytes, then the rest operation
failed.
+ If NumberOfBytes is zero, then return 0.
+
+ @param Buffer The pointer to the data buffer to store the data
read from the serial device.
+ @param NumberOfBytes The number of bytes which will be read.
+
+ @retval 0 Read data failed; No data is to be read.
+ @retval >0 The actual number of bytes read from serial device.
+
+**/
+UINTN
+EFIAPI
+SerialPortRead (
+ OUT UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ UINTN Index;
+
+ Index = 0;
+ while ((Index < NumberOfBytes) && SerialPortPoll ()) {
+ Buffer[Index++] = (UINT8)mLastGetChar;
+ mLastGetChar = -1;
+ }
+
+ return Index;
+}
+
+/**
+ Polls a serial device to see if there is any data waiting to be read.
+
+ Polls a serial device to see if there is any data waiting to be read.
+ If there is data waiting to be read from the serial device, then TRUE is
returned.
+ If there is no data waiting to be read from the serial device, then FALSE is
returned.
+
+ @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
+ )
+{
+ /*
+ * Careful. OpenSBI with HTIF console will return -1 followed by -2
+ * if there is no character received. So just check for values >= 0.
+ */
+
+ if (mLastGetChar >= 0) {
+ return TRUE;
+ }
+
+ if (mHaveDbcn) {
+ UINT8 Buffer;
+ SBI_RET Ret;
+
+ Ret = SbiCall (
+ SBI_EXT_DBCN,
+ SBI_EXT_DBCN_READ,
+ 3,
+ 1,
+ ((UINTN)&Buffer),
+ 0
+ );
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value == 1))
+ {
+ mLastGetChar = Buffer;
+ }
+ } else if (mHaveLegacyGetchar) {
+ mLastGetChar = (INT64)SbiCall (SBI_EXT_0_1_CONSOLE_GETCHAR, 0, 0).Error;
+ }
+
+ return mLastGetChar >= 0;
+}
+
+/**
+ Sets the control bits on a serial device.
+
+ @param Control Sets the bits of Control that are settable.
+
+ @retval RETURN_SUCCESS The new control bits were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetControl (
+ IN UINT32 Control
+ )
+{
+ return RETURN_SUCCESS;
+}
+
+/**
+ Retrieve the status of the control bits on a serial device.
+
+ @param Control A pointer to return the current control
signals from the serial device.
+
+ @retval RETURN_SUCCESS The control bits were read from the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortGetControl (
+ OUT UINT32 *Control
+ )
+{
+ *Control = 0;
+ return RETURN_SUCCESS;
+}
+
+/**
+ Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
+ data bits, and stop bits on a serial device.
+
+ @param BaudRate The requested baud rate. A BaudRate value of 0
will use the
+ device's default interface speed.
+ On output, the value actually set.
+ @param ReveiveFifoDepth The requested depth of the FIFO on the receive
side of the
+ serial interface. A ReceiveFifoDepth value of 0
will use
+ the device's default FIFO depth.
+ On output, the value actually set.
+ @param Timeout The requested time out for a single character in
microseconds.
+ This timeout applies to both the transmit and
receive side of the
+ interface. A Timeout value of 0 will use the
device's default time
+ out value.
+ On output, the value actually set.
+ @param Parity The type of parity to use on this serial device. A
Parity value of
+ DefaultParity will use the device's default parity
value.
+ On output, the value actually set.
+ @param DataBits The number of data bits to use on the serial
device. A DataBits
+ vaule of 0 will use the device's default data bit
setting.
+ On output, the value actually set.
+ @param StopBits The number of stop bits to use on this serial
device. A StopBits
+ value of DefaultStopBits will use the device's
default number of
+ stop bits.
+ On output, the value actually set.
+
+ @retval RETURN_SUCCESS The new attributes were set on the serial
device.
+ @retval RETURN_UNSUPPORTED The serial device does not support this
operation.
+ @retval RETURN_INVALID_PARAMETER One or more of the attributes has an
unsupported value.
+ @retval RETURN_DEVICE_ERROR The serial device is not functioning
correctly.
+
+**/
+RETURN_STATUS
+EFIAPI
+SerialPortSetAttributes (
+ IN OUT UINT64 *BaudRate,
+ IN OUT UINT32 *ReceiveFifoDepth,
+ IN OUT UINT32 *Timeout,
+ IN OUT EFI_PARITY_TYPE *Parity,
+ IN OUT UINT8 *DataBits,
+ IN OUT EFI_STOP_BITS_TYPE *StopBits
+ )
+{
+ return RETURN_SUCCESS;
+}
diff --git a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.c
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.c
new file mode 100644
index 000000000000..4926ac675b62
--- /dev/null
+++ b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/Common.c
@@ -0,0 +1,132 @@
+/** @file
+ Serial Port Library backed by SBI console.
+
+ Common functionality shared by PrePiDxeSerialPortLibRiscVSbi and
+ PrePiDxeSerialPortLibRiscVSbiRam implementations.
+
+ Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "Common.h"
+
+/**
+ Return whether the DBCN extension is implemented.
+
+ @retval TRUE Extension is implemented.
+ @retval FALSE Extension is not implemented.
+
+**/
+BOOLEAN
+SbiImplementsDbcn (
+ VOID
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_DBCN);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/**
+ Return whether the legacy console putchar extension is implemented.
+
+ @retval TRUE Extension is implemented.
+ @retval FALSE Extension is not implemented.
+
+**/
+BOOLEAN
+SbiImplementsLegacyPutchar (
+ VOID
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1,
SBI_EXT_0_1_CONSOLE_PUTCHAR);
+ if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
+ (Ret.Value != 0))
+ {
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+/**
+ Write data from buffer to console via SBI legacy putchar extension.
+
+ The number of bytes actually written to the SBI console is returned.
+ If the return value is less than NumberOfBytes, then the write operation
failed.
+
+ @param Buffer The pointer to the data buffer to be written.
+ @param NumberOfBytes The number of bytes to written to the serial device.
+
+ @retval >=0 The number of bytes written to the serial device.
+ If this value is less than NumberOfBytes, then the
+ write operation failed.
+
+**/
+UINTN
+SbiLegacyPutchar (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ SBI_RET Ret;
+ UINTN Index;
+
+ for (Index = 0; Index < NumberOfBytes; Index++) {
+ Ret = SbiCall (SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, 1, Buffer[Index]);
+ if ((INT64)Ret.Error < 0) {
+ break;
+ }
+ }
+
+ return Index;
+}
+
+/**
+ Write data from buffer to console via SBI DBCN.
+
+ The number of bytes actually written to the SBI console is returned.
+ If the return value is less than NumberOfBytes, then the write operation
failed.
+
+ @param Buffer The pointer to the data buffer to be written.
+ @param NumberOfBytes The number of bytes to written to the serial device.
+
+ @retval >=0 The number of bytes written to the serial device.
+ If this value is less than NumberOfBytes, then the
+ write operation failed.
+
+**/
+UINTN
+SbiDbcnWrite (
+ IN UINT8 *Buffer,
+ IN UINTN NumberOfBytes
+ )
+{
+ SBI_RET Ret;
+
+ Ret = SbiCall (
+ SBI_EXT_DBCN,
+ SBI_EXT_DBCN_WRITE,
+ 3,
+ NumberOfBytes,
+ ((UINTN)Buffer),
+ 0
+ );
+
+ /*
+ * May do partial writes. Don't bother decoding
+ * Ret.Error as we're only interested in number of
+ * bytes written to console.
+ */
+ return Ret.Value;
+}
diff --git
a/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.uni
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.uni
new file mode 100644
index 000000000000..7b22caa5a090
--- /dev/null
+++
b/MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.uni
@@ -0,0 +1,16 @@
+// /** @file
+// Serial Port Library backed by SBI console.
+//
+// Serial Port Library backed by SBI console.
+//
+// Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "Serial Port Library
backed by SBI console"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Serial Port Library
backed by SBI console."
+
--
2.25.1
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