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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>doors.h</TITLE>
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<FONT SIZE="5"><B>The <doors.h> Header File</B></FONT>
<HR>
<P><B>Basic header file for kernel-mode programming</B></P>
<P>This header file will be included automatically by <A HREF="default.html">default.h</A>
if you define the global preprocessor symbol <CODE>USE_KERNEL</CODE>.
<BR><BR>
First, this header file defines a global symbol named <CODE>DOORS</CODE> which is used
in other header files to indicate kernel mode.
Next, it includes <A HREF="default.html">default.h</A> to make
sure that the basic macros which GCC4TI needs are defined. It also includes
a header file called <CODE>romsymb.h</CODE>, which overrides some definitions
from <A HREF="default.html">default.h</A> by referring to external
<CODE>_ROM_CALL_xxx</CODE> symbols which are converted by the linker.
<BR><BR>
It contains code for <CODE>tigcc.a</CODE>, to support <CODE>RETURN_VALUE</CODE>.
Finally, it contains some rather complicated macros and <CODE>asm</CODE> statements
to put data needed for <CODE>RETURN_VALUE</CODE> directly into the assembly file.</P>
<H3><U>Functions</U></H3>
<DL INDENT="20"><DT><B><A HREF="#_ram_call_addr">_ram_call_addr</A></B><DD>Performs a kernel-mode RAM call.<IMG WIDTH="1" HEIGHT="20" ALIGN="TOP"><DT><B><A HREF="#_ram_call">_ram_call</A></B><DD>Performs a kernel-mode RAM call with a cast.</DL>
<P>See also: <A HREF="httigcc.html#kernel">How to make a kernel-based program</A>, <A HREF="default.html">default.h</A>, <A HREF="nostub.html">nostub.h</A></P>
<HR>
<H3><A NAME="_ram_call_addr"><U>_ram_call_addr</U></A></H3>
<P><TABLE BORDER="1" CELLPADDING="2"><TR><TD CLASS="CODE"><B><A HREF="cpp.html#SEC10">#define</A></B> _ram_call_addr(ind) (&_RAM_CALL_##ind)</TD></TR></TABLE></P>
<P><B>Performs a kernel-mode RAM call.</B></P>
<P>_ram_call_addr returns a void pointer to the location in memory defined
by the kernel as RAM call <I>ind</I>.</P>
<HR>
<H3><A NAME="_ram_call"><U>_ram_call</U></A></H3>
<P><TABLE BORDER="1" CELLPADDING="2"><TR><TD CLASS="CODE"><B><A HREF="cpp.html#SEC10">#define</A></B> _ram_call(ind,type) ((type)(&_RAM_CALL_##ind))</TD></TR></TABLE></P>
<P><B>Performs a kernel-mode RAM call with a cast.</B></P>
<P>_ram_call uses <A HREF="#_ram_call_addr">_ram_call_addr</A> to get a
void pointer to the location in memory defined by the kernel as RAM call
<I>ind</I>, and then casts it to the type <I>type</I>. To avoid prescan
of <I>ind</I>, <A HREF="#_ram_call_addr">_ram_call_addr</A> is
written out.</P>
<HR>
<H3><A HREF="index.html">Return to the main index</A></H3>
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