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\chapter{The Linux Compatibility Layer}

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It is the glue code used for the interaction between the kernel and the linux

code. It is the suggested option for using drivers ported from the Linux 2.6

kernel tree.

\vspace{7mm}

\begin{intest}

LINUXC26\_REGISTER\_MODULE\index{linuxc26\_register\_module(int use\_intdrive)}

\end{intest}

\begin{description}

\item [\texttt{void LINUXC26\_register\_module(int use\_intdrive);}]

\item [\texttt{Description:}] It initializes the compatibility layer interface

and the library's internal data structures.

\item [\texttt{Parameters:}] TRUE indicates to use the IntDrive for managing

interrupts; FALSE makes the glue layer to use the old interrupt management

system.

\item [\texttt{Return value:}] 0 if the module is installed; 1 otherwise.

\end{description}

\begin{description}

\item [Example:]

\end{description}

\begin{verbatim}

int device_drivers_init() {

    int res;

    KEYB_PARMS kparms = BASE_KEYB;

    LINUXC26_register_module(TRUE);

    PCI26_init();

    INPUT26_init();

    keyb_def_ctrlC(kparms, NULL);

    KEYB26_init(&kparms);

    FB26_init();

    res = FB26_open(FRAME_BUFFER_DEVICE);

    if (res) {

        cprintf("Error: Cannot open graphical mode\n");

        KEYB26_close();

        INPUT26_close();

        exit(1);

    }

    FB26_use_grx(FRAME_BUFFER_DEVICE);

    FB26_setmode(FRAME_BUFFER_DEVICE,"640x480-16");

    return 0;

}

\end{verbatim}