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Diffstat (limited to 'src/VBox/Runtime/common/log/logcom.cpp')
| -rw-r--r-- | src/VBox/Runtime/common/log/logcom.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/VBox/Runtime/common/log/logcom.cpp b/src/VBox/Runtime/common/log/logcom.cpp new file mode 100644 index 00000000..79d1c46c --- /dev/null +++ b/src/VBox/Runtime/common/log/logcom.cpp @@ -0,0 +1,156 @@ +/* $Id: logcom.cpp $ */ +/** @file + * IPRT - Logging to Serial Port. + */ + +/* + * Copyright (C) 2006-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Defined Constants And Macros * +*********************************************************************************************************************************/ +#ifndef IPRT_UART_BASE +/** The port address of the COM port to log to. + * + * To override the default (COM1) append IPRT_UART_BASE=0xWXYZ to DEFS in your + * LocalConfig.kmk. Alternatively you can edit this file, but the don't forget + * to also update the default found in VBox/asmdefs.h. + * + * Standard port assignments are: COM1=0x3f8, COM2=0x2f8, COM3=0x3e8, COM4=0x2e8. + */ +# define IPRT_UART_BASE 0x3f8 +#endif + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include <iprt/log.h> +#include "internal/iprt.h" + +#include <iprt/asm.h> +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) /** @todo consider fixing the config instead. */ +# include <iprt/asm-amd64-x86.h> +#endif +#include <iprt/stdarg.h> +#include <iprt/string.h> + + +/********************************************************************************************************************************* +* Internal Functions * +*********************************************************************************************************************************/ +static DECLCALLBACK(size_t) rtLogComOutput(void *pv, const char *pachChars, size_t cbChars); + + +/** + * Prints a formatted string to the serial port used for logging. + * + * @returns Number of bytes written. + * @param pszFormat Format string. + * @param ... Optional arguments specified in the format string. + */ +RTDECL(size_t) RTLogComPrintf(const char *pszFormat, ...) +{ + va_list args; + size_t cb; + va_start(args, pszFormat); + cb = RTLogComPrintfV(pszFormat, args); + va_end(args); + + return cb; +} +RT_EXPORT_SYMBOL(RTLogComPrintf); + + +/** + * Prints a formatted string to the serial port used for logging. + * + * @returns Number of bytes written. + * @param pszFormat Format string. + * @param args Optional arguments specified in the format string. + */ +RTDECL(size_t) RTLogComPrintfV(const char *pszFormat, va_list args) +{ + return RTLogFormatV(rtLogComOutput, NULL, pszFormat, args); +} +RT_EXPORT_SYMBOL(RTLogComPrintfV); + + +/** + * Callback for RTLogFormatV which writes to the com port. + * See PFNLOGOUTPUT() for details. + */ +static DECLCALLBACK(size_t) rtLogComOutput(void *pv, const char *pachChars, size_t cbChars) +{ + NOREF(pv); + if (cbChars) + RTLogWriteCom(pachChars, cbChars); + return cbChars; +} + + +/** + * Write log buffer to COM port. + * + * @param pach Pointer to the buffer to write. + * @param cb Number of bytes to write. + */ +RTDECL(void) RTLogWriteCom(const char *pach, size_t cb) +{ +#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86) + const uint8_t *pu8; + for (pu8 = (const uint8_t *)pach; cb-- > 0; pu8++) + { + unsigned cMaxWait; + uint8_t u8; + + /* expand \n -> \r\n */ + if (*pu8 == '\n') + RTLogWriteCom("\r", 1); + + /* Check if port is ready. */ + cMaxWait = ~0U; + do + { + u8 = ASMInU8(IPRT_UART_BASE + 5); + cMaxWait--; + } while (!(u8 & 0x20) && u8 != 0xff && cMaxWait); + + /* write */ + ASMOutU8(IPRT_UART_BASE, *pu8); + } +#else + /* PORTME? */ +#endif +} +RT_EXPORT_SYMBOL(RTLogWriteCom); + |