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
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To:	djgpp AT delorie DOT com
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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

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