URL
https://opencores.org/ocsvn/or1k_old/or1k_old/trunk
Subversion Repositories or1k_old
[/] [or1k_old/] [trunk/] [ecos-2.0/] [doc/] [html/] [ref/] [hal-interfaces.html] - Rev 1782
Compare with Previous | Blame | View Log
<!-- 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 Interfaces</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="The eCos Hardware Abstraction Layer (HAL)"
HREF="the-ecos-hardware-abstraction-layer.html"><LINK
REL="PREVIOUS"
TITLE="General principles"
HREF="hal-general-principles.html"><LINK
REL="NEXT"
TITLE="Architecture Characterization"
HREF="hal-architecture-characterization.html"></HEAD
><BODY
CLASS="CHAPTER"
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-general-principles.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="bottom"
><A
HREF="hal-architecture-characterization.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="CHAPTER"
><H1
><A
NAME="HAL-INTERFACES">Chapter 9. HAL Interfaces</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="hal-interfaces.html#HAL-BASE-DEFINITIONS"
>Base Definitions</A
></DT
><DT
><A
HREF="hal-architecture-characterization.html"
>Architecture Characterization</A
></DT
><DT
><A
HREF="hal-interrupt-handling.html"
>Interrupt Handling</A
></DT
><DT
><A
HREF="hal-input-and-output.html"
>HAL I/O</A
></DT
><DT
><A
HREF="hal-cache-control.html"
>Cache Control</A
></DT
><DT
><A
HREF="hal-linker-scripts.html"
>Linker Scripts</A
></DT
><DT
><A
HREF="hal-diagnostic-support.html"
>Diagnostic Support</A
></DT
><DT
><A
HREF="hal-smp-support.html"
>SMP Support</A
></DT
></DL
></DIV
><P
>This section describes the main HAL interfaces. </P
><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="HAL-BASE-DEFINITIONS">Base Definitions</H1
><P
>These are definitions that characterize the properties of the base
architecture that are used to compile the portable parts of the
kernel. They are concerned with such things a portable type
definitions, endianness, and labeling.</P
><P
>These definitions are supplied by the
<TT
CLASS="FILENAME"
>cyg/hal/basetype.h</TT
> header file which is supplied
by the architecture HAL. It is included automatically by
<TT
CLASS="FILENAME"
>cyg/infra/cyg_type.h</TT
>.</P
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN7743">Byte order</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="VARNAME"
>CYG_BYTEORDER</TT
></DT
><DD
><P
> This defines the byte order of the target and must be set to either
<TT
CLASS="VARNAME"
>CYG_LSBFIRST</TT
> or <TT
CLASS="VARNAME"
>CYG_MSBFIRST</TT
>.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN7753">Label Translation</H2
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="FUNCTION"
>CYG_LABEL_NAME(name)</TT
></DT
><DD
><P
> This is a wrapper used in some C and C++ files which
use labels defined in assembly code or the linker script.
It need only be defined if the default implementation in
<TT
CLASS="FILENAME"
>cyg/infra/cyg_type.h</TT
>, which passes the name
argument unaltered, is inadequate. It should be paired with
<TT
CLASS="FUNCTION"
>CYG_LABEL_DEFN()</TT
>.
</P
></DD
><DT
><TT
CLASS="FUNCTION"
>CYG_LABEL_DEFN(name)</TT
></DT
><DD
><P
> This is a wrapper used in assembler sources and linker scripts
which define labels. It need only be defined if the default
implementation in
<TT
CLASS="FILENAME"
>cyg/infra/cyg_type.h</TT
>, which passes the name
argument unaltered, is inadequate. The most usual alternative
definition of this macro prepends an underscore to the label
name.
</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN7769">Base types</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> cyg_halint8
cyg_halint16
cyg_halint32
cyg_halint64
cyg_halcount8
cyg_halcount16
cyg_halcount32
cyg_halcount64
cyg_halbool</PRE
></TD
></TR
></TABLE
><P
>These macros define the C base types that should be used to define
variables of the given size. They only need to be defined if the
default types specified in <TT
CLASS="FILENAME"
>cyg/infra/cyg_type.h</TT
>
cannot be used. Note that these are only the base types, they will be
composed with <TT
CLASS="LITERAL"
>signed</TT
> and
<TT
CLASS="LITERAL"
>unsigned</TT
> to form full type specifications.</P
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN7776">Atomic types</H2
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> cyg_halatomic CYG_ATOMIC</PRE
></TD
></TR
></TABLE
><P
>These types are guaranteed to be read or written in a single
uninterruptible operation. It is architecture defined what size this
type is, but it will be at least a byte.</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-general-principles.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-architecture-characterization.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>General principles</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="the-ecos-hardware-abstraction-layer.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Architecture Characterization</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>