reactos操作系统实现(91)

发布时间：2020-12-15 05:00:36 所属栏目：百科来源：网络整理

导读：驱动程序很多配置参数是保存在注册表里，比如 IO 资源参数，中断号等内容。因此只有了解注册表的读取，以及相关内容才可以清楚知道键盘驱动程序，主要操作那些相关的端口，还有配置参数。下面来分析函数 ReadRegistryEntries 的实现，如下： #001 NTSTATUS #

驱动程序很多配置参数是保存在注册表里，比如IO资源参数，中断号等内容。因此只有了解注册表的读取，以及相关内容才可以清楚知道键盘驱动程序，主要操作那些相关的端口，还有配置参数。下面来分析函数ReadRegistryEntries的实现，如下：

#001 NTSTATUS

#002 ReadRegistryEntries(

#003 IN PUNICODE_STRING RegistryPath,

#004 OUT PI8042_SETTINGS Settings)

#005 {

#006 RTL_QUERY_REGISTRY_TABLE Parameters[17];

#007 NTSTATUS Status;

#008

设置键盘缺省的队列大小。

#009 ULONG DefaultKeyboardDataQueueSize = 0x64;

其它缺省参数。

#010 PCWSTR DefaultKeyboardDeviceBaseName = L"KeyboardPort";

#011 ULONG DefaultMouseDataQueueSize = 0x64;

#012 ULONG DefaultMouseResolution = 3;

#013 ULONG DefaultMouseSynchIn100ns = 20000000;

#014 ULONG DefaultNumberOfButtons = 2;

#015 PCWSTR DefaultPointerDeviceBaseName = L"PointerPort";

#016 ULONG DefaultPollStatusIterations = 1;

#017 ULONG DefaultOverrideKeyboardType = 4;

#018 ULONG DefaultOverrideKeyboardSubtype = 0;

#019 ULONG DefaultPollingIterations = 12000;

#020 ULONG DefaultPollingIterationsMaximum = 12000;

#021 ULONG DefaultResendIterations = 0x3;

#022 ULONG DefaultSampleRate = 60;

#023 ULONG DefaultCrashOnCtrlScroll;

#024

#025 /* Default value for CrashOnCtrlScroll depends if we're

#026 * running a debug build or a normal build.

#027 */

#028 #ifdef DBG

#029 DefaultCrashOnCtrlScroll = 1;

#030 #else

#031 DefaultCrashOnCtrlScroll = 0;

#032 #endif

#033

初始化参数内存。

#034 RtlZeroMemory(Parameters,sizeof(Parameters));

#035

#036 Parameters[0].Flags = RTL_QUERY_REGISTRY_SUBKEY;

#037 Parameters[0].Name = L"Parameters";

#038

#039 Parameters[1].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#040 Parameters[1].Name = L"KeyboardDataQueueSize";

#041 Parameters[1].EntryContext = &Settings->KeyboardDataQueueSize;

#042 Parameters[1].DefaultType = REG_DWORD;

#043 Parameters[1].DefaultData = &DefaultKeyboardDataQueueSize;

#044 Parameters[1].DefaultLength = sizeof(ULONG);

#045

#046 Parameters[2].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#047 Parameters[2].Name = L"KeyboardDeviceBaseName";

#048 Parameters[2].EntryContext = &Settings->KeyboardDeviceBaseName;

#049 Parameters[2].DefaultType = REG_SZ;

#050 Parameters[2].DefaultData = (PVOID)DefaultKeyboardDeviceBaseName;

#051 Parameters[2].DefaultLength = 0;

#052

#053 Parameters[3].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#054 Parameters[3].Name = L"MouseDataQueueSize";

#055 Parameters[3].EntryContext = &Settings->MouseDataQueueSize;

#056 Parameters[3].DefaultType = REG_DWORD;

#057 Parameters[3].DefaultData = &DefaultMouseDataQueueSize;

#058 Parameters[3].DefaultLength = sizeof(ULONG);

#059

#060 Parameters[4].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#061 Parameters[4].Name = L"MouseResolution";

#062 Parameters[4].EntryContext = &Settings->MouseResolution;

#063 Parameters[4].DefaultType = REG_DWORD;

#064 Parameters[4].DefaultData = &DefaultMouseResolution;

#065 Parameters[4].DefaultLength = sizeof(ULONG);

#066

#067 Parameters[5].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#068 Parameters[5].Name = L"MouseSynchIn100ns";

#069 Parameters[5].EntryContext = &Settings->MouseSynchIn100ns;

#070 Parameters[5].DefaultType = REG_DWORD;

#071 Parameters[5].DefaultData = &DefaultMouseSynchIn100ns;

#072 Parameters[5].DefaultLength = sizeof(ULONG);

#073

#074 Parameters[6].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#075 Parameters[6].Name = L"NumberOfButtons";

#076 Parameters[6].EntryContext = &Settings->NumberOfButtons;

#077 Parameters[6].DefaultType = REG_DWORD;

#078 Parameters[6].DefaultData = &DefaultNumberOfButtons;

#079 Parameters[6].DefaultLength = sizeof(ULONG);

#080

#081 Parameters[7].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#082 Parameters[7].Name = L"PointerDeviceBaseName";

#083 Parameters[7].EntryContext = &Settings->PointerDeviceBaseName;

#084 Parameters[7].DefaultType = REG_SZ;

#085 Parameters[7].DefaultData = (PVOID)DefaultPointerDeviceBaseName;

#086 Parameters[7].DefaultLength = 0;

#087

#088 Parameters[8].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#089 Parameters[8].Name = L"PollStatusIterations";

#090 Parameters[8].EntryContext = &Settings->PollStatusIterations;

#091 Parameters[8].DefaultType = REG_DWORD;

#092 Parameters[8].DefaultData = &DefaultPollStatusIterations;

#093 Parameters[8].DefaultLength = sizeof(ULONG);

#094

#095 Parameters[9].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#096 Parameters[9].Name = L"OverrideKeyboardType";

#097 Parameters[9].EntryContext = &Settings->OverrideKeyboardType;

#098 Parameters[9].DefaultType = REG_DWORD;

#099 Parameters[9].DefaultData = &DefaultOverrideKeyboardType;

#100 Parameters[9].DefaultLength = sizeof(ULONG);

#101

#102 Parameters[10].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#103 Parameters[10].Name = L"OverrideKeyboardSubtype";

#104 Parameters[10].EntryContext = &Settings->OverrideKeyboardSubtype;

#105 Parameters[10].DefaultType = REG_DWORD;

#106 Parameters[10].DefaultData = &DefaultOverrideKeyboardSubtype;

#107 Parameters[10].DefaultLength = sizeof(ULONG);

#108

#109 Parameters[11].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#110 Parameters[11].Name = L"PollingIterations";

#111 Parameters[11].EntryContext = &Settings->PollingIterations;

#112 Parameters[11].DefaultType = REG_DWORD;

#113 Parameters[11].DefaultData = &DefaultPollingIterations;

#114 Parameters[11].DefaultLength = sizeof(ULONG);

#115

#116 Parameters[12].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#117 Parameters[12].Name = L"PollingIterationsMaximum";

#118 Parameters[12].EntryContext = &Settings->PollingIterationsMaximum;

#119 Parameters[12].DefaultType = REG_DWORD;

#120 Parameters[12].DefaultData = &DefaultPollingIterationsMaximum;

#121 Parameters[12].DefaultLength = sizeof(ULONG);

#122

#123 Parameters[13].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#124 Parameters[13].Name = L"ResendIterations";

#125 Parameters[13].EntryContext = &Settings->ResendIterations;

#126 Parameters[13].DefaultType = REG_DWORD;

#127 Parameters[13].DefaultData = &DefaultResendIterations;

#128 Parameters[13].DefaultLength = sizeof(ULONG);

#129

#130 Parameters[14].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#131 Parameters[14].Name = L"SampleRate";

#132 Parameters[14].EntryContext = &Settings->SampleRate;

#133 Parameters[14].DefaultType = REG_DWORD;

#134 Parameters[14].DefaultData = &DefaultSampleRate;

#135 Parameters[14].DefaultLength = sizeof(ULONG);

#136

#137 Parameters[15].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_REGISTRY_OPTIONAL;

#138 Parameters[15].Name = L"CrashOnCtrlScroll";

#139 Parameters[15].EntryContext = &Settings->CrashOnCtrlScroll;

#140 Parameters[15].DefaultType = REG_DWORD;

#141 Parameters[15].DefaultData = &DefaultCrashOnCtrlScroll;

#142 Parameters[15].DefaultLength = sizeof(ULONG);

#143

读取注册表里的值。

#144 Status = RtlQueryRegistryValues(

#145 RTL_REGISTRY_ABSOLUTE,

#146 RegistryPath->Buffer,

#147 Parameters,

#148 NULL,

#149 NULL);

#150

保存到Settings里面。

#151 if (NT_SUCCESS(Status))

#152 {

#153 /* Check values */

#154 if (Settings->KeyboardDataQueueSize < 1)

#155 Settings->KeyboardDataQueueSize = DefaultKeyboardDataQueueSize;

#156 if (Settings->MouseDataQueueSize < 1)

#157 Settings->MouseDataQueueSize = DefaultMouseDataQueueSize;

#158 if (Settings->NumberOfButtons < 1)

#159 Settings->NumberOfButtons = DefaultNumberOfButtons;

#160 if (Settings->PollingIterations < 0x400)

#161 Settings->PollingIterations = DefaultPollingIterations;

#162 if (Settings->PollingIterationsMaximum < 0x400)

#163 Settings->PollingIterationsMaximum = DefaultPollingIterationsMaximum;

#164 if (Settings->ResendIterations < 1)

#165 Settings->ResendIterations = DefaultResendIterations;

#166 }

#167 else if (Status == STATUS_OBJECT_NAME_NOT_FOUND)

#168 {

#169 /* Registry path doesn't exist. Set defaults */

#170 Settings->KeyboardDataQueueSize = DefaultKeyboardDataQueueSize;

#171 Settings->MouseDataQueueSize = DefaultMouseDataQueueSize;

#172 Settings->MouseResolution = DefaultMouseResolution;

#173 Settings->MouseSynchIn100ns = DefaultMouseSynchIn100ns;

#174 Settings->NumberOfButtons = DefaultNumberOfButtons;

#175 Settings->PollStatusIterations = DefaultPollStatusIterations;

#176 Settings->OverrideKeyboardType = DefaultOverrideKeyboardType;

#177 Settings->OverrideKeyboardSubtype = DefaultOverrideKeyboardSubtype;

#178 Settings->PollingIterations = DefaultPollingIterations;

#179 Settings->PollingIterationsMaximum = DefaultPollingIterationsMaximum;

#180 Settings->ResendIterations = DefaultResendIterations;

#181 Settings->SampleRate = DefaultSampleRate;

#182 Settings->CrashOnCtrlScroll = DefaultCrashOnCtrlScroll;

#183 if (!RtlCreateUnicodeString(&Settings->KeyboardDeviceBaseName,DefaultKeyboardDeviceBaseName)

#184 || !RtlCreateUnicodeString(&Settings->PointerDeviceBaseName,DefaultPointerDeviceBaseName))

#185 {

#186 WARN_(I8042PRT,"RtlCreateUnicodeString() failed/n");

#187 Status = STATUS_NO_MEMORY;

#188 }

#189 else

#190 {

#191 Status = STATUS_SUCCESS;

#192 }

#193 }

#194

进行调试输出信息。

#195 if (NT_SUCCESS(Status))

#196 {

#197 INFO_(I8042PRT,"KeyboardDataQueueSize : 0x%lx/n",Settings->KeyboardDataQueueSize);

#198 INFO_(I8042PRT,"KeyboardDeviceBaseName : %wZ/n",&Settings->KeyboardDeviceBaseName);

#199 INFO_(I8042PRT,"MouseDataQueueSize : 0x%lx/n",Settings->MouseDataQueueSize);

#200 INFO_(I8042PRT,"MouseResolution : 0x%lx/n",Settings->MouseResolution);

#201 INFO_(I8042PRT,"MouseSynchIn100ns : %lu/n",Settings->MouseSynchIn100ns);

#202 INFO_(I8042PRT,"NumberOfButtons : 0x%lx/n",Settings->NumberOfButtons);

#203 INFO_(I8042PRT,"PointerDeviceBaseName : %wZ/n",&Settings->PointerDeviceBaseName);

#204 INFO_(I8042PRT,"PollStatusIterations : 0x%lx/n",Settings->PollStatusIterations);

#205 INFO_(I8042PRT,"OverrideKeyboardType : 0x%lx/n",Settings->OverrideKeyboardType);

#206 INFO_(I8042PRT,"OverrideKeyboardSubtype : 0x%lx/n",Settings->OverrideKeyboardSubtype);

#207 INFO_(I8042PRT,"PollingIterations : 0x%lx/n",Settings->PollingIterations);

#208 INFO_(I8042PRT,"PollingIterationsMaximum : %lu/n",Settings->PollingIterationsMaximum);

#209 INFO_(I8042PRT,"ResendIterations : 0x%lx/n",Settings->ResendIterations);

#210 INFO_(I8042PRT,"SampleRate : %lu/n",Settings->SampleRate);

#211 }

#212

#213 return Status;

#214}

（编辑：李大同）

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