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><A
NAME="HAL-INTERFACES">Chapter 9. HAL Interfaces</H1
><DIV
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><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="hal-interfaces.html#HAL-BASE-DEFINITIONS"
>Base Definitions</A
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>Architecture Characterization</A
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>HAL I/O</A
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><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
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><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
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><H2
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><A
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><TABLE
BORDER="5"
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><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
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CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="AEN7776">Atomic types</H2
><TABLE
BORDER="5"
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><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
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