mirror of https://github.com/acidanthera/audk.git
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
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/** @file
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Serial Port Library backed by SBI console.
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Common functionality shared by PrePiDxeSerialPortLibRiscVSbi and
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PrePiDxeSerialPortLibRiscVSbiRam implementations.
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Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "Common.h"
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/**
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Return whether the DBCN extension is implemented.
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@retval TRUE Extension is implemented.
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@retval FALSE Extension is not implemented.
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**/
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BOOLEAN
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SbiImplementsDbcn (
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VOID
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)
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{
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SBI_RET Ret;
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Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_DBCN);
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if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
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(Ret.Value != 0))
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{
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return TRUE;
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}
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return FALSE;
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}
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/**
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Return whether the legacy console putchar extension is implemented.
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@retval TRUE Extension is implemented.
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@retval FALSE Extension is not implemented.
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**/
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BOOLEAN
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SbiImplementsLegacyPutchar (
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VOID
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)
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{
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SBI_RET Ret;
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Ret = SbiCall (SBI_EXT_BASE, SBI_EXT_BASE_PROBE_EXT, 1, SBI_EXT_0_1_CONSOLE_PUTCHAR);
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if ((TranslateError (Ret.Error) == EFI_SUCCESS) &&
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(Ret.Value != 0))
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{
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return TRUE;
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}
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return FALSE;
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}
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/**
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Write data from buffer to console via SBI legacy putchar extension.
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The number of bytes actually written to the SBI console is returned.
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If the return value is less than NumberOfBytes, then the write operation failed.
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@param Buffer The pointer to the data buffer to be written.
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@param NumberOfBytes The number of bytes to written to the serial device.
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@retval >=0 The number of bytes written to the serial device.
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If this value is less than NumberOfBytes, then the
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write operation failed.
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**/
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UINTN
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SbiLegacyPutchar (
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IN UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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SBI_RET Ret;
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UINTN Index;
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for (Index = 0; Index < NumberOfBytes; Index++) {
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Ret = SbiCall (SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, 1, Buffer[Index]);
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if ((INT64)Ret.Error < 0) {
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break;
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}
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}
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return Index;
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}
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/**
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Write data from buffer to console via SBI DBCN.
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The number of bytes actually written to the SBI console is returned.
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If the return value is less than NumberOfBytes, then the write operation failed.
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@param Buffer The pointer to the data buffer to be written.
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@param NumberOfBytes The number of bytes to written to the serial device.
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@retval >=0 The number of bytes written to the serial device.
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If this value is less than NumberOfBytes, then the
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write operation failed.
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**/
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UINTN
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SbiDbcnWrite (
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IN UINT8 *Buffer,
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IN UINTN NumberOfBytes
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)
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{
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SBI_RET Ret;
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Ret = SbiCall (
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SBI_EXT_DBCN,
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SBI_EXT_DBCN_WRITE,
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3,
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NumberOfBytes,
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((UINTN)Buffer),
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0
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);
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/*
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* May do partial writes. Don't bother decoding
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* Ret.Error as we're only interested in number of
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* bytes written to console.
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*/
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return Ret.Value;
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}
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