kvm-guest-drivers-windows

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/*
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 * This file contains various balloon driver routines
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 *
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 * Copyright (c) 2009-2017  Red Hat, Inc.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met :
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and / or other materials provided with the distribution.
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 * 3. Neither the names of the copyright holders nor the names of their contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include "precomp.h"
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#if defined(EVENT_TRACING)
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#include "utils.tmh"
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#else
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#define PRINT_DEBUG
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#endif
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int nDebugLevel = 0;
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int bDebugPrint = 0;
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#define     TEMP_BUFFER_SIZE        256
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// Global debug printout level and enable\disable flag
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int virtioDebugLevel;
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int bDebugPrint;
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int driverDebugLevel;
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ULONG driverDebugFlags;
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#if defined(COM_DEBUG)
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#define RHEL_DEBUG_PORT     ((PUCHAR)0x3F8)
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static void DebugPrintFuncSerial(const char *format, ...)
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{
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    char buf[TEMP_BUFFER_SIZE];
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    NTSTATUS status;
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    size_t len;
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    va_list list;
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    va_start(list, format);
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    status = RtlStringCbVPrintfA(buf, sizeof(buf), format, list);
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    if (status == STATUS_SUCCESS)
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    {
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        len = strlen(buf);
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    }
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    else
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    {
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        len = 2;
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        buf[0] = 'O';
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        buf[1] = '\n';
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    }
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    if (len)
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    {
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        WRITE_PORT_BUFFER_UCHAR(RHEL_DEBUG_PORT, (PUCHAR)buf, len);
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        WRITE_PORT_UCHAR(RHEL_DEBUG_PORT, '\r');
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    }
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    va_end(list);
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}
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#endif
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#if defined(PRINT_DEBUG)
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static void DebugPrintFunc(const char *format, ...)
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{
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    va_list list;
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    va_start(list, format);
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    vDbgPrintEx(DPFLTR_DEFAULT_ID, 9 | DPFLTR_MASK, format, list);
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    va_end(list);
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}
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#endif
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#if defined(EVENT_TRACING)
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static void DebugPrintFuncWPP(const char *format, ...)
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{
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    char buf[256];
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    NTSTATUS status;
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    va_list list;
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    va_start(list, format);
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    status = RtlStringCbVPrintfA(buf, sizeof(buf), format, list);
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    if (status == STATUS_SUCCESS)
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    {
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        TraceEvents(TRACE_LEVEL_WARNING, DBG_HW_ACCESS, "%s", buf);
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    }
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    va_end(list);
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}
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#endif
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static void NoDebugPrintFunc(const char *format, ...)
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{
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    UNREFERENCED_PARAMETER(format);
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}
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void InitializeDebugPrints(IN PDRIVER_OBJECT  DriverObject, PUNICODE_STRING RegistryPath)
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{
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    //TBD - Read nDebugLevel and bDebugPrint from the registry
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    WPP_INIT_TRACING(DriverObject, RegistryPath);
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    bDebugPrint = 1;
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    virtioDebugLevel = 0;
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#if defined(EVENT_TRACING)
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    VirtioDebugPrintProc = DebugPrintFuncWPP;
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#elif defined(PRINT_DEBUG)
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    VirtioDebugPrintProc = DebugPrintFunc;
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#elif defined(COM_DEBUG)
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    VirtioDebugPrintProc = DebugPrintFuncSerial;
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#else
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    VirtioDebugPrintProc = NoDebugPrintFunc;
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#endif
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    driverDebugFlags = 0xffffffff;
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    driverDebugLevel = TRACE_LEVEL_VERBOSE;
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    virtioDebugLevel = 4;
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}
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tDebugPrintFunc VirtioDebugPrintProc;
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