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WMI是Windows操作系统管理数据和操作的基础设施，系统管理员可以使用VB Script、PowerShell及Windows API（C++、C#等）管理本地或远程计算机。
使用WMI框架应用程序可以直接访问EC RAM、 I/O端口、Memory地址、寄存器、Setup NV设定值，以及其他的系统设备资源。

一、Asl code设计

OemWMIDemo.asl

Scope(\_SB)
{Device(AMW1)//WMI{// pnp0c14 is Plug and Play ID assigned to WMI mapperName(_HID, "PNP0C14")Name(_UID, "WMIDEMO")    // Description of data and events supportedName(_WDG, Buffer() {//// Event// GUID 93B56635-6D54-42D7-BB7D-DF77D452CCE4// BIOS can generator WMI event by Notify (<<WMI device name>>, 0xAC)//0x35, 0x66, 0xB5, 0x93, 0x54, 0x6D, 0xD7, 0x42, 0xBB, 0x7D, 0xDF, 0x77, 0xD4, 0x52, 0xCC, 0xE4,     // GUID0xAC, 0,       // Event Notification ID1,             // Instance Count0x08,          // Flags (WMIACPI_REGFLAG_EVENT)//// Method// GUID ABBC0FB8-8EA1-11D1-A000-C90629100000//0xB8, 0x0F, 0xBC, 0xAB, 0xA1, 0x8E, 0xD1, 0x11, 0xA0, 0x00, 0xC9, 0x06, 0x29, 0x10, 0, 0,0x44, 0x45,    // Object Id (DE)1,             // Instance Count0x02,          // Flags (WMIACPI_REGFLAG_METHOD)//// This GUID for returning the MOF data// 05901221-D566-11D1-B2F0-00A0C90629100x21, 0x12, 0x90, 0x05, 0x66, 0xd5, 0xd1, 0x11, 0xb2, 0xf0, 0x00, 0xa0, 0xc9, 0x06, 0x29, 0x10,66, 68,        // Object ID (BD)1,             // Instance Count0x00,          // Flags(none)})Name(FEAC, Buffer(0x04){0x00, 0x00, 0x00, 0x00})Method (EVAC, 0){  Return (FEAC)               } // End of Method EVAC//// EcRAM Method data block// Arg0 has the instance being queried// Arg1 has the method id// Arg2 has the data passedMethod(WMDE, 3){//MethodId 1if(LEqual(Arg1, 1)){Store(Arg2, FEAC)Notify(AMW1, 0xAC)Return(0)}}// More info about an event// Arg0 is the event id that was firedMethod(_WED, 1, NotSerialized){If(LEqual(Arg0, 0xAC)){Return(EVAC())}}// -------- Compiled version of "Associated MOF File" below --------// Memo: generated by mofcomp.exeName(WQBD, Buffer(){})}
}//end scope _SB

其中Mof GUID（0x21, 0x12, 0x90, 0x05, 0x66, 0xd5, 0xd1, 0x11, 0xb2, 0xf0, 0x00, 0xa0, 0xc9, 0x06, 0x29, 0x10）为固定值。

二、Mof code设计

OemWMIDemo.mof

[WMI, Dynamic, provider("WMIProv"),locale("MS\\0x409"), GUID("{ABBC0FB8-8EA1-11D1-A000-C90629100000}"), Description("Call BIOS Function through WMI")
]
class WmiDemo
{[key, read] string InstanceName;[read] Boolean Active;[WmiMethodId(1), Implemented, read, write, Description("My method 1")] void MyMethod1([inout, Description("My method 1")] uint32 Data);};[WMI, Dynamic, provider("WMIProv"),locale("MS\\0x409"), GUID("{93B56635-6D54-42D7-BB7D-DF77D452CCE4}"), Description("Event generated when machine is hit") 
]
class DemoWmiEvent : WMIEvent
{[key, read] string InstanceName;[read] Boolean Active;[WmiDataId(1),read, write,Description("Force with which the machine was hit")] uint32 Force;
};

三、编译Mof文件

工具：
mofcomp.exe为系统自带
wmimofck.exe可以从Windows WDK拷贝

将mof文件编译成bmf二进制文件

D:\WMI_Demo>mofcomp.exe -B:OemWMIDemo.bmf OemWMIDemo.mof
分析 MOF 文件: OemWMIDemo.mof
已成功分析 MOF 文件
将二进制 MOF 数据存储在 OemWMIDemo.bmf 中Binary mof file OemWMIDemo.bmf expanded to 3126 bytes

使用wmimofck.exe可生成VBS脚本

D:\WMI_Demo>wmimofck.exe -tOemWMIDemo.vbs OemWMIDemo.bmf
Microsoft (R) WDM Extensions To WMI MOF Checking Utility  Version 1.50.0000
Copyright (c) Microsoft Corp. 1997-2000. All rights reserved.Binary mof file OemWMIDemo.bmf expanded to 3126 bytes

使用wmimofck.exe将bmf二进制文件转成文本

D:\WMI_Demo>wmimofck.exe -x"WIMDemo.txt" OemWMIDemo.bmf
Microsoft (R) WDM Extensions To WMI MOF Checking Utility  Version 1.50.0000
Copyright (c) Microsoft Corp. 1997-2000. All rights reserved.

将文本中的内容填入asl文件中Name(WQBD, Buffer() { })的Buffer里。

四、测试

使用WMICodeCreator.exe工具进行测试。可支持生成VBScript, C#, and VB .NET代码。
管理员身份打开WMICodeCreator.exe。

1. 首先设置event，并执行
   在VBS脚本中，添加Wscript.Echo objReceivedEvent.Force语句可输出Event的返回值
   

2. 设置Method，并执行
   注意instance要出来，并且选中，如果没出来可能是GUID没填对，没选中的话执行会报错。
   

参考
创建一个WMI ACPI device
基于Windows Management Instrumentation（WMI）的BIOS接口设计