驱动程序的动态加载

驱动程序做出来后，怎么用呢？根据Four-F的说法，有三种方式：服务控制管理器(Service Control Manager (SCM).)
服务控制程序(Service Control Program (SCP).)和服务程序(service program).
下面我们就用服务控制程序(SCP)来实现驱动程序的动态加载，例子程序在 KmdKit/examples/simple/Beeper
代码如下：
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;
;  scp.asm
;
;  Service Control Program for beeper.sys driver
;
;  Written by Four-F ([email protected])
;
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.386
.model  flat,  stdcall
option  casemap: none

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;                                  I N C L U D E   F I L E S                                        
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include /masm32/ include/windows.inc

include /masm32/ include/kernel32.inc
include /masm32/ include/user32.inc
include /masm32/ include/advapi32.inc

includelib /masm32/ lib/kernel32.lib
includelib /masm32/ lib/user32.lib
includelib /masm32/ lib/advapi32.lib

include /masm32/Macros/Strings.mac

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.code

start  proc

local hSCManager:HANDLE
local hService:HANDLE
local acDriverPath[MAX_PATH]:CHAR

    ; Open a handle to the SC Manager database
    invoke OpenSCManager, NULL, NULL, SC_MANAGER_CREATE_SERVICE
    .if  eax != NULL
       mov hSCManager,  eax

       push  eax
       invoke GetFullPathName, $CTA0( "beeper.sys"), sizeof acDriverPath,  addr acDriverPath,  esp
        pop  eax

       ; Register driver in SCM active database
       invoke CreateService, hSCManager, $CTA0( "beeper"), $CTA0( "Nice Melody Beeper"), /
            SERVICE_START + DELETE, SERVICE_KERNEL_DRIVER, SERVICE_DEMAND_START, /
            SERVICE_ERROR_IGNORE,  addr acDriverPath, NULL, NULL, NULL, NULL, NULL
       .if  eax != NULL
          mov hService,  eax
          invoke StartService, hService, 0, NULL
          ; Here driver beeper.sys plays its nice melody
          ; and reports error to be removed from memory
          ; Remove driver from SCM database
          invoke DeleteService, hService
          invoke CloseServiceHandle, hService
       .else
          invoke MessageBox, NULL, $CTA0( "Can't register driver."), NULL, MB_ICONSTOP
       .endif
       invoke CloseServiceHandle, hSCManager
    .else
       invoke MessageBox, NULL, $CTA0( "Can't connect to Service Control Manager."), /
                     NULL, MB_ICONSTOP
    .endif

    invoke ExitProcess, 0

start  endp

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end start
；=============以下是驱动程序源码beeper.bat的内容===========
;@echo off
;goto make

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;
;  beeper - Kernel Mode Driver
;  Makes beep thorough computer speaker
;
;  Written by Four-F ([email protected])
;
;  WARNING: Tested W2000 & XP only!
;
;:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

.386
.model  flat,  stdcall
option  casemap: none

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;                                  I N C L U D E   F I L E S                                        
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include /masm32/ include/w2k/ntstatus.inc
include /masm32/ include/w2k/ntddk.inc

include /masm32/ include/w2k/hal.inc

includelib /masm32/ lib/w2k/hal.lib

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;                           U S E R   D E F I N E D   E Q U A T E S                                 
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TIMER_FREQUENCY    equ 1193167          ; 1,193,167 Hz
OCTAVE          equ 2

;PITCH_A      equ 440            ;  440,00 Hz
;PITCH_As      equ 446            ;  466,16 Hz
;PITCH_H      equ 494            ;  493,88 Hz
PITCH_C          equ 523             ;  523,25 Hz
PITCH_Cs       equ 554             ;  554,37 Hz
PITCH_D          equ 587             ;  587,33 Hz
PITCH_Ds       equ 622             ;  622,25 Hz
PITCH_E          equ 659             ;  659,25 Hz
PITCH_F          equ 698             ;  698,46 Hz
PITCH_Fs       equ 740             ;  739,99 Hz
PITCH_G          equ 784             ;  783,99 Hz
PITCH_Gs       equ 831             ;  830,61 Hz
PITCH_A          equ 880             ;  880,00 Hz
PITCH_As       equ 988             ;  987,77 Hz
PITCH_H          equ 1047          ; 1046,50 Hz

; We are going to play c-major chord

TONE_1          equ TIMER_FREQUENCY/(PITCH_C*OCTAVE)
TONE_2          equ TIMER_FREQUENCY/(PITCH_E*OCTAVE)
TONE_3          equ (PITCH_G*OCTAVE) ; for HalMakeBeep

DELAY          equ 1800000h       ; for my ~800mHz machine

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DO_DELAY  MACRO
    ; Silly method, but it works ;-)
    mov  eax, DELAY
    .while  eax
       dec  eax
    .endw
ENDM

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.code

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;                                         MakeBeep1                                                 
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MakeBeep1  proc dwPitch: DWORD

    ; Direct hardware access

    cli

    mov  al, 10110110y
    out 43h,  al          ; Timer 8253-5 (AT: 8254.2).

    mov  eax, dwPitch
    out 42h,  al

    mov  al,  ah
    out 42h,  al

    ; speaker ON
    in  al, 61h
    or   al, 11y
    out 61h,  al

    sti

   DO_DELAY

    cli

    ; speaker OFF
    in  al, 61h
    and  al, 11111100y
    out 61h,  al

    sti

    ret

MakeBeep1  endp

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;                                            MakeBeep2                                              
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MakeBeep2  proc dwPitch: DWORD

    ; Hardware access via HAL using *_PORT_UCHAR/*_PORT_UCHAR functions

    cli

    invoke WRITE_PORT_UCHAR, 43h, 10110110y

    mov  eax, dwPitch
    invoke WRITE_PORT_UCHAR, 42h,  al
    mov  eax, dwPitch
    invoke WRITE_PORT_UCHAR, 42h,  ah

    ; speaker ON
    invoke READ_PORT_UCHAR, 61h
    or   al, 11y
    invoke WRITE_PORT_UCHAR, 61h,  al

    sti

   DO_DELAY   

    cli

    ; speaker OFF
    invoke READ_PORT_UCHAR, 61h
    and  al, 11111100y
    invoke WRITE_PORT_UCHAR, 61h,  al

    sti

    ret

MakeBeep2  endp

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;                                       DriverEntry                                                 
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DriverEntry  proc pDriverObject:PDRIVER_OBJECT, pusRegistryPath:PUNICODE_STRING

    invoke MakeBeep1, TONE_1
    invoke MakeBeep2, TONE_2

    ; Hardware access via hal.dll function HalMakeBeep
    invoke HalMakeBeep, TONE_3
   DO_DELAY
    invoke HalMakeBeep, 0

    mov  eax, STATUS_DEVICE_CONFIGURATION_ERROR
    ret

DriverEntry  endp

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end DriverEntry

:make

set drv=beeper

/masm32/bin/ml /nologo /c /coff %drv%.bat
/masm32/bin/link /nologo /driver /base:0x10000 /align:32 / out:%drv%.sys /subsystem:native %drv%.obj

del %drv%.obj

echo.
pause
rem=============以上是驱动程序源码beeper.bat的内容===========

我们双击KmdKit/examples/simple/Beeper/下的beeper.bat，编译生成beeper.sys,然后像编译一般的win32asm程序那样编译scp.asm,生成scp.exe,双击scp.exe，你听到了什么？是主板上的喇叭发出的声音，这是通过直接控制端口发出来的，我们已经突破了ring0的限制，高兴吗？