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docs/dxeload.xml
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70
docs/dxeload.xml
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<?xml version="1.0" encoding="ISO8859-1"?>
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<fpdoc-descriptions>
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<!--
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$Id$
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This file is part of the FPC documentation.
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Copyright (C) 1997, by Michael Van Canneyt
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The FPC documentation is free text; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The FPC Documentation is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the FPC documentation; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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-->
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<package name="rtl">
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<module name="dxeload">
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<short>Load DXE file in to memory</short>
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<descr>
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<p>
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The <file>dxeload</file> unit was implemented by Pierre M\"uller for dos,
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it allows to load a DXE file (an object file with 1 entry point)
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into memory and return a pointer to the entry point.
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</p>
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<p>
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It exists only for dos.
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</p>
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</descr>
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<element name="DXE_MAGIC">
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<short> Magic number, found in the header of a DXE file.</short>>
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</element>
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<element name="dxe_header">
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<short>Record with header of DXE file</short>
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<descr>
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The <var>dxe_header</var> record describes the header of a DXE file. It is used to
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determine the magic number of the DXE file and number of relocations that
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must be done when the object file is loaded in memory.
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</descr>
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</element>
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<element name="dxe_load">
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<short>Load DXE file in memory</short>
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<descr>
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<p>
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<var>dxe_load</var> loads the contents of the file <var>filename</var> into memory.
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It performs the necessary relocations in the object code, and returns then
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a pointer to the entry point of the code.
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</p>
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<p>
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For an example, see the <link id="#rtl.emu387">emu387</link> unit in the RTL.
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</p>
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</descr>
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<errors>
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If an error occurs during the load or relocations, <var>Nil</var> is returned.
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</errors>
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</element>
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</module>
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</package>
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</fpdoc-descriptions>
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82
docs/emu387.xml
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82
docs/emu387.xml
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<?xml version="1.0" encoding="ISO8859-1"?>
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<fpdoc-descriptions>
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<!--
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$Id$
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This file is part of the FPC documentation.
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Copyright (C) 1997, by Michael Van Canneyt
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The FPC documentation is free text; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The FPC Documentation is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the FPC documentation; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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-->
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<package name="rtl">
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<module name="emu387">
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<short>Load coprocessor emulation support</short>
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<descr>
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<p>
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The <file>emu387</file> unit was written by Pierre Mueller for dos. It
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sets up the coprocessor emulation for FPC under dos. It is not necessary to
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use this unit on other OS platforms because they either simply do not run on
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a machine without coprocessor, or they provide the coprocessor emulation
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themselves.
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</p>
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<p>
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It shouldn't be necessary to use the function in this unit, it should be
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enough to place this unit in the <var>uses</var> clause of your program to
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enable the coprocessor emulation under dos. The unit initialization
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code will try and load the coprocessor emulation code and initialize it.
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</p>
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</descr>
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<element name="npxsetup">
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<short>Set up coprocessor emulation.</short>
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<descr>
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<p>
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<var>npxsetup</var> checks whether a coprocessor is found. If not, it loads the
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file <file>wmemu387.dxe</file> into memory and initializes the code in it.
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</p>
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<p>
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If the environment variable <var>387</var> is set to <var>N</var>, then the emulation
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will be loaded, even if there is a coprocessor present. If the variable
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doesn't exist, or is set to any other value, the unit will try to detect
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the presence of a coprocessor unit.
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</p>
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<p>
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The function searches the file <file>wmemu387.dxe</file> in the following way:
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</p>
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<ol>
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<li> If the environment variable <var>EMU387</var> is set, then it is assumed
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to point at the <file>wmemu387.dxe</file> file.
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</li>
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<li> if the environment variable <var>EMU387</var> does not exist, then the
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function will take the path part of <var>prog_name</var> and look in that
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directory for the file <file>wmemu387.dxe</file>.
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</li>
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</ol>
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<p>
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It should never be necessary to call this function, because the
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initialization code of the unit contains a call to the function with
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as an argument <var>paramstr(0)</var>. This means that you should deliver the
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file <var>wmemu387.dxe</var> together with your program.
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</p>
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</descr>
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<errors>
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If there is an error, an error message is printed to standard error, and
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the program is halted, since any floating-point code is bound to fail anyhow.
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</errors>
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</element>
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</module>
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</package>
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</fpdoc-descriptions>
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