From: "Martin Czamai" <Martin_Czamai AT peak-service DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: interrupt service routine in protected mode for a PCI device
Date: 6 Oct 1999 05:42:38 GMT
Organization: germany.net Onlinedienste
Lines: 42
Message-ID: <7tenge$6tb$1@newshost.germany.net>
NNTP-Posting-Host: d21173.netzdienste.de
X-Trace: newshost.germany.net 939188558 7083 151.189.115.97 (6 Oct 1999 05:42:38 GMT)
X-Complaints-To: news AT germany DOT net
NNTP-Posting-Date: 6 Oct 1999 05:42:38 GMT
X-Priority:  3
X-MimeOLE:  Produced By Microsoft MimeOLE V5.00.2314.1300
X-Newsreader:  Microsoft Outlook Express 5.00.2314.1300
X-MSMail-Priority:  Normal
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi all,

can anybody tell me, whats wrong with this code?
...
        BYTE PCI_INT = GetINT(Device);    // Interrupt Line Number read from
the configuration space

        // interrupt service routine (ISR) must NOT be swaped out to file
        _go32_dpmi_lock_code(ISR, (DWORD)LOCK_ISR - (DWORD)ISR);
//        _go32_dpmi_lock_data((void*) &Msg, (long)sizeof(Msg));      //
currently not used

        _go32_dpmi_get_protected_mode_interrupt_vector(PCI_INT,
&OldHandler);
        Handler.pm_offset = (int)ISR;
        _go32_dpmi_allocate_iret_wrapper(&Handler);
        _go32_dpmi_set_protected_mode_interrupt_vector(PCI_INT, &Handler);
...
// SYSTEM CRASHES NOW!!! (sinply hangs up)

notes:
Handler and OldHandler are of type  _go32_dpmi_seginfo and global defined.
ISR is defined in an other file the following way:

...
void ISR(void)
 { assert(0);                 // not implemented
 }
 void LOCK_ISR(void)      // dummy function to recognize size of the ISR via
some pointer arithmetic
{ 
}
...

Please send your comments/solutions to Martin_Czamai AT peak-service DOT com .

Thank you and best regards

Martin