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\label{freebsd-dev}

\section{Introduction}

{\bf This chapter is woefully incomplete. }
The \oskit{} \freebsd{} device library provides an infrastructure for using
unmodified \freebsd{} 2.1.7 device drivers.

\section{Supported Devices}
\label{freebsd-dev-sup}

The \freebsd{} device library currently supports only the system console and
a few ISA-based serial port interfaces all exporting the {\tt oskit_ttystream}
interface.
Only the system console and PS/2 mouse have been tested.

Following is a list of supported drivers.
The tag is the name used by the device library to refer to the devices
(see Section~\ref{fdev-naming} for details on device naming).
\begin{itemize}
\item[sc]
	PC system console.
\item[sio]
	PC serial port.
\item[cx]
	ISA bus Cronyx-Sigma serial port adapter.
\item[cy]
	ISA bus Cyclades Cyclom-Y serial board.
\item[rc]
	ISA bus RISCom/8 serial board.
\item[si]
	ISA bus Specialix serial line multiplexor.
\item[mse]
	Bus mouse.
\item[psm]
	PS/2 mouse.
\end{itemize}

\apisec{Header Files}

\api{freebsd.h}{common device driver framework definitions}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}
\end{apisyn}
\begin{apidesc}
	Contains common definitions and function prototypes for
	the \oskit's \freebsd{} device interfaces described in the next section.
\end{apidesc}

\apisec{Interfaces}

\api{oskit_freebsd_init}{Initialize and \freebsd{} device driver support package}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}

	\funcproto void oskit_freebsd_init(void);
\end{apisyn}
\ostodrv
\begin{apidesc}
	Initializes the support code for \freebsd{} device drivers.

	Currently the {\tt oskit_freebsd_init_{\em driver}} routines
	take care of invoking any required freebsd device initialization
	functions, including this one.  This may change	in the future.
% 	{\tt oskit_freebsd_init} should be called before any other
%	{\tt oskit_freebsd_*} interface.

\end{apidesc}

\api{oskit_freebsd_init_devs}{Initialize and register all \freebsd{} device drivers}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}

	\funcproto void oskit_freebsd_init_devs(void);
\end{apisyn}
\ostodrv
\begin{apidesc}
	Initialize and register all available \freebsd{} device drivers.

	Warning messages will be printed with {\tt osenv_log} for drivers
	which cannot be initialized but the initialization process will
	continue.
\end{apidesc}
\begin{apirel}
	{\tt osenv_log}
\end{apirel}

\api{oskit_freebsd_init_isa}{Initialize and register all \freebsd{} ISA bus device drivers}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}

	\funcproto void oskit_freebsd_init_isa(void);
\end{apisyn}
\ostodrv
\begin{apidesc}
	Initialize and register all available \freebsd{} ISA bus device drivers.
	See {\tt <oskit/dev/freebsd_isa.h>} for the currently available
	devices.

	Warning messages will be printed with {\tt osenv_log} for drivers
	which cannot be initialized but the initialization process will
	continue.

	Currently the {\tt oskit_freebsd_init_{\em driver}} routines
	take care of invoking any required freebsd device initialization
	functions, including this one.  This may change	in the future.
\end{apidesc}
\begin{apirel}
	{\tt osenv_log}
\end{apirel}

\api{oskit_freebsd_init_{\em driver}}{Initialize and register a single \freebsd{} device driver}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}

	\funcproto oskit_error_t oskit_freebsd_init_{\em driver}(void);
\end{apisyn}
\ostodrv
\begin{apidesc}
	Initialize a single \freebsd{} device driver.
	Possible values for {\em driver} are listed in
	Section~\ref{freebsd-dev-sup}.
\end{apidesc}
\begin{apiret}
	Returns 0 on success,
	an error code specified in {\tt <oskit/dev/error.h>} on error.
\end{apiret}

\apisec{``Back door'' Interfaces}

``Back door'' interfaces are intended for users which have some builtin
knowledge of \freebsd{} internals and want to convert that knowledge to
interface-level equivalents.

\api{oskit_freebsd_chardev_open}{Open a character device using a \freebsd{} major/minor device value}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}

	\funcproto oskit_error_t oskit_freebsd_chardev_open(int major, int minor,
				int flags,
				\outparam oskit_ttystream_t **tty_stream);
\end{apisyn}
\ostodrv
\begin{apidesc}
	Opens a character device given a
	\freebsd{} major and minor device value.
	Returns a pointer to an {\tt oskit_ttystream_t} interface as though
	{\tt oskit_ttydev_open} was called on an \oskit{} {\tt oskit_ttydev_t} interface.
\end{apidesc}
\begin{apiparm}
	\item[major]
		Major device number.
		In \freebsd, this is the index of the device
		in the character device switch.
	\item[minor]
		Minor device number.
		In \freebsd, the interpretation of the minor device number
		is device specific.
	\item[flags]
		\posix{} {\tt open} flags.
	\item[tty_stream]
		Returned {\tt oskit_ttystream_t} interface.
\end{apiparm}
\begin{apiret}
	Returns 0 on success,
	an error from {\tt <oskit/dev/error.h>} otherwise.
\end{apiret}

\api{oskit_freebsd_xlate_errno}{Translate a \freebsd{} error number}
\begin{apisyn}
	\cinclude{oskit/dev/freebsd.h}

	\funcproto oskit_error_t oskit_freebsd_xlate_errno(int freebsd_error);
\end{apisyn}
\ostodrv
\begin{apidesc}
	Translates a \freebsd{} error number into an \oskit{} error number.
\end{apidesc}
\begin{apiparm}
	\item[freebsd_error]
		The \freebsd{} error code to be translated.
\end{apiparm}
\begin{apiret}
	Returns an equivalent error value from {\tt <oskit/dev/error.h>},
	or {\tt OSKIT_E_UNEXPECTED} if there is no suitable translation.
\end{apiret}