1 files changed, 146 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..68097e97
--- /dev/null
+++ b/src/VBox/Runtime/common/log/logcom.cpp
@@ -0,0 +1,146 @@
+/* $Id: logcom.cpp $ */
+/** @file
+ * IPRT - Logging to Serial Port.
+ */
+
+/*
+ * Copyright (C) 2006-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   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++)
+    {
+        register unsigned cMaxWait;
+        register 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);
+