VC6下编译进Ring0代码的疑惑(6)

时间:2009-12-30 15:42来源:未知作者:admin 点击: 次

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int Freq; RING0PROC BeepOn() { ENTERRING0; BYTE b; if ((Freq = 20) (Freq = 20000)) { Freq = 1193181 / Freq; b = _inp(0x61); if ((b 3) == 0) { _outp(0x61, (BYTE) (b | 3)); _outp(0x43, 0xb6); } _outp(0x

int Freq;
RING0PROC BeepOn()
{
ENTERRING0;

    BYTE b;

    if ((Freq >= 20) && (Freq <= 20000))
    {
        Freq = 1193181 / Freq;
        b = _inp(0x61);
        if ((b & 3) == 0)
{
   _outp(0x61, (BYTE) (b | 3));
   _outp(0x43, 0xb6);
}
        _outp(0x42, (BYTE) Freq);
        _outp(0x42, (BYTE) (Freq >> 8));
    };

LEAVERING0;
};

RING0PROC BeepOff()
{
ENTERRING0;

    BYTE b;

    b= (_inp(0x61) & 0xfc);
    _outp(0x61, b);

LEAVERING0;
};

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
ZeroMemory(&r0Data,sizeof(struct _RING0DATA));
VirtualLock((PVOID)&r0Data,sizeof(struct _RING0DATA));
ExecRing0Proc((ULONG)Ring0Proc1,0x100);
ExecRing0Proc((ULONG)Ring0Proc2,0x100);
VirtualUnlock((PVOID)&r0Data,sizeof(struct _RING0DATA));

char* msg=new char[100];
sprintf(msg,"CR0 = %x CR2 = %x CR3 = %x ", r0Data.mcr0,r0Data.mcr2,r0Data.mcr3);
MessageBox(NULL,msg,NULL,NULL);

delete [] msg;
Freq=5000;

ExecRing0Proc((ULONG)BeepOn,0x100);
Sleep(1000);
Freq=3000;
ExecRing0Proc((ULONG)BeepOn,0x100);
Sleep(1000);
ExecRing0Proc((ULONG)BeepOff,0x100);
MessageBox(NULL,"com3",NULL,NULL);
return 0;
}