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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >HAL Structure</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE=" Porting Guide" HREF="hal-porting-guide.html"><LINK REL="PREVIOUS" TITLE=" Porting Guide" HREF="hal-porting-guide.html"><LINK REL="NEXT" TITLE="Virtual Vectors (eCos/ROM Monitor Calling Interface)" HREF="hal-calling-if.html"></HEAD ><BODY CLASS="SECTION" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="hal-porting-guide.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 11. Porting Guide</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="hal-calling-if.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECTION" ><H1 CLASS="SECTION" ><A NAME="HAL-PORTING-STRUCTURE">HAL Structure</H1 ><P >In order to write an eCos HAL it's a good idea to have at least a passing understanding of how the HAL interacts with the rest of the system.</P ><DIV CLASS="SECTION" ><H2 CLASS="SECTION" ><A NAME="AEN8659">HAL Classes</H2 ><P >The eCos HAL consists of four HAL sub-classes. This table gives a brief description of each class and partly reiterates the description in <A HREF="hal-architecture-variant-and-platform.html" >Chapter 7</A >. The links refer to the on-line CVS tree (specifically to the sub-HALs used by the PowerPC MBX target).</P ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN8663"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH ALIGN="LEFT" VALIGN="TOP" >HAL type</TH ><TH ALIGN="LEFT" VALIGN="TOP" >Description</TH ><TH ALIGN="LEFT" VALIGN="TOP" >Functionality Overview</TH ></TR ></THEAD ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" >Common HAL <A HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/common/current?cvsroot=ecos" TARGET="_top" >(hal/common)</A ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Configuration options and functionality shared by all HALs.</TD ><TD ALIGN="LEFT" VALIGN="TOP" >Generic debugging functionality, driver API, eCos/ROM monitor calling interface, and tests.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" >Architecture HAL <A HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/arch/current?cvsroot=ecos" TARGET="_top" >(hal/<architecture>/arch)</A ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Functionality specific to the given architecture. Also default implementations of some functionality which can be overridden by variant or platform HALs.</TD ><TD ALIGN="LEFT" VALIGN="TOP" >Architecture specific debugger functionality (handles single stepping, exception-to-signal conversion, etc.), exception/interrupt vector definitions and handlers, cache definition and control macros, context switching code, assembler functions for early system initialization, configuration options, and possibly tests. </TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" >Variant HAL <A HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/mpc8xx/current?cvsroot=ecos" TARGET="_top" >(hal/<architecture>/<variant>)</A ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Some CPU architectures consist of a number variants, for example MIPS CPUs come in both 32 and 64 bit versions, and some variants have embedded features additional to the CPU core.</TD ><TD ALIGN="LEFT" VALIGN="TOP" >Variant extensions to the architecture code (cache, exception/interrupt), configuration options, possibly drivers for variant on-core devices, and possibly tests.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" >Platform HAL <A HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/mbx/current?cvsroot=ecos" TARGET="_top" >(hal/<architecture>/<platform>)</A ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Contains functionality and configuration options specific to the platform.</TD ><TD ALIGN="LEFT" VALIGN="TOP" >Early platform initialization code, platform memory layout specification, configuration options (processor speed, compiler options), diagnostic IO functions, debugger IO functions, platform specific extensions to architecture or variant code (off-core interrupt controller), and possibly tests.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" >Auxiliary HAL <A HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/quicc/current?cvsroot=ecos" TARGET="_top" >(hal/<architecture>/<module>)</A ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Some variants share common modules on the core. Motorola's PowerPC QUICC is an example of such a module.</TD ><TD ALIGN="LEFT" VALIGN="TOP" >Module specific functionality (interrupt controller, simple device drivers), possibly tests.</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="SECTION" ><H2 CLASS="SECTION" ><A NAME="AEN8696">File Descriptions</H2 ><P >Listed below are the files found in various HALs, with a short description of what each file contains. When looking in existing HALs beware that they do not necessarily follow this naming scheme. If you are writing a new HAL, please try to follow it as closely as possible. Still, no two targets are the same, so sometimes it makes sense to use additional files.</P ><DIV CLASS="SECTION" ><H3 CLASS="SECTION" ><A NAME="AEN8699">Common HAL</H3 ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN8701"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH ALIGN="LEFT" VALIGN="TOP" >File</TH ><TH ALIGN="LEFT" VALIGN="TOP" >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/dbg-thread-syscall.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines the thread debugging syscall function. This is used by the ROM monitor to access the thread debugging API in the RAM application. .</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/dbg-threads-api.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines the thread debugging API. .</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/drv_api.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines the driver API.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/generic-stub.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines the generic stub features.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_if.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines the ROM/RAM calling interface API.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_misc.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines miscellaneous helper functions shared by all HALs.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_stub.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines eCos mappings of GDB stub features.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/dbg-threads-syscall.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Thread debugging implementation.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/drv_api.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Driver API implementation. Depending on configuration this provides either wrappers for the kernel API, or a minimal implementation of these features. This allows drivers to be written relying only on HAL features.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/dummy.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Empty dummy file ensuring creation of libtarget.a.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/generic-stub.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Generic GDB stub implementation. This provides the communication protocol used to communicate with GDB over a serial device or via the network.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_if.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >ROM/RAM calling interface implementation. Provides wrappers from the calling interface API to the eCos features used for the implementation.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_misc.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Various helper functions shared by all platforms and architectures.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_stub.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Wrappers from eCos HAL features to the features required by the generic GDB stub.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/stubrom/stubrom.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >The file used to build eCos GDB stub images. Basically a cyg_start function with a hard coded breakpoint.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/thread-packets.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >More thread debugging related functions.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/thread-pkts.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines more thread debugging related function.</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="SECTION" ><H3 CLASS="SECTION" ><A NAME="AEN8776">Architecture HAL</H3 ><P >Some architecture HALs may add extra files for architecture specific serial drivers, or for handling interrupts and exceptions if it makes sense.</P ><P >Note that many of the definitions in these files are only conditionally defined - if the equivalent variant or platform headers provide the definitions, those override the generic architecture definitions.</P ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN8780"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH ALIGN="LEFT" VALIGN="TOP" >File</TH ><TH ALIGN="LEFT" VALIGN="TOP" >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/arch.inc</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Various assembly macros used during system initialization.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/basetype.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Endian, label, alignment, and type size definitions. These override common defaults in CYGPKG_INFRA.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_arch.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Saved register frame format, various thread, register and stack related macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_cache.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Cache definitions and cache control macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_intr.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Exception and interrupt definitions. Macros for configuring and controlling interrupts. eCos real-time clock control macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_io.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Macros for accessing IO devices.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/<arch>_regs.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Architecture register definitions.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/<arch>_stub.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Architecture stub definitions. In particular the register frame layout used by GDB. This may differ from the one used by eCos.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/<arch>.inc</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Architecture convenience assembly macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/<arch>.ld</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Linker macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/context.S</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Functions handling context switching and setjmp/longjmp.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_misc.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Exception and interrupt handlers in C. Various other utility functions.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_mk_defs.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Used to export definitions from C header files to assembler header files.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_intr.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Any necessary interrupt handling functions.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/<arch>stub.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Architecture stub code. Contains functions for translating eCos exceptions to UNIX signals and functions for single-stepping.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/vectors.S</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Exception, interrupt and early initialization code.</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="SECTION" ><H3 CLASS="SECTION" ><A NAME="AEN8851">Variant HAL</H3 ><P >Some variant HALs may add extra files for variant specific serial drivers, or for handling interrupts/exceptions if it makes sense.</P ><P >Note that these files may be mostly empty if the CPU variant can be controlled by the generic architecture macros. The definitions present are only conditionally defined - if the equivalent platform headers provide the definitions, those override the variant definitions.</P ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN8855"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH ALIGN="LEFT" VALIGN="TOP" >File</TH ><TH ALIGN="LEFT" VALIGN="TOP" >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/var_arch.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Saved register frame format, various thread, register and stack related macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/var_cache.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Cache related macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/var_intr.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Interrupt related macros.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/var_regs.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Extra register definitions for the CPU variant.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/variant.inc</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Various assembly macros used during system initialization.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/var_intr.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Interrupt functions if necessary.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/var_misc.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >hal_variant_init function and any necessary extra functions.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/variant.S</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Interrupt handler table definition.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/<arch>_<variant>.ld</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Linker macros.</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ></DIV ><DIV CLASS="SECTION" ><H3 CLASS="SECTION" ><A NAME="AEN8898">Platform HAL</H3 ><P >Extras files may be added for platform specific serial drivers. Extra files for handling interrupts and exceptions will be present if it makes sense.</P ><DIV CLASS="INFORMALTABLE" ><A NAME="AEN8901"><P ></P ><TABLE BORDER="1" CLASS="CALSTABLE" ><THEAD ><TR ><TH ALIGN="LEFT" VALIGN="TOP" >File</TH ><TH ALIGN="LEFT" VALIGN="TOP" >Description</TH ></TR ></THEAD ><TBODY ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/hal_diag.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines functions used for HAL diagnostics output. This would normally be the ROM calling interface wrappers, but may also be the low-level IO functions themselves, saving a little overhead.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/platform.inc</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Platform initialization code. This includes memory controller, vectors, and monitor initialization. Depending on the architecture, other things may need defining here as well: interrupt decoding, status register initialization value, etc.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/plf_cache.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Platform specific cache handling.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/plf_intr.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Platform specific interrupt handling.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/plf_io.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >PCI IO definitions and macros. May also be used to override generic HAL IO macros if the platform endianness differs from that of the CPU.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >include/plf_stub.h</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Defines stub initializer and board reset details.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/hal_diag.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >May contain the low-level device drivers. But these may also reside in plf_stub.c</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/platform.S</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Memory controller setup macro, and if necessary interrupt springboard code.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/plf_misc.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Platform initialization code.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/plf_mk_defs.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Used to export definitions from C header files to assembler header files.</TD ></TR ><TR ><TD ALIGN="LEFT" VALIGN="TOP" ><TT CLASS="FILENAME" >src/plf_stub.c</TT ></TD ><TD ALIGN="LEFT" VALIGN="TOP" >Platform specific stub initialization and possibly the low-level device driver.</TD ></TR ></TBODY ></TABLE ><P ></P ></DIV ><P >The platform HAL also contains files specifying the platform's memory layout. These files are located in <TT CLASS="FILENAME" >include/pkgconf</TT >.</P ></DIV ><DIV CLASS="SECTION" ><H3 CLASS="SECTION" ><A NAME="AEN8954">Auxiliary HAL</H3 ><P >Auxiliary HALs contain whatever files are necessary to provide the required functionality. There are no predefined set of files required in an auxiliary HAL.</P ></DIV ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="hal-porting-guide.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="hal-calling-if.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Porting Guide</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="hal-porting-guide.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Virtual Vectors (eCos/ROM Monitor Calling Interface)</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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