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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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><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&#0043;&#0043; 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"
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>

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1	28	unneback	`<!-- Copyright (C) 2003 Red Hat, Inc. -->`
2			`<!-- This material may be distributed only subject to the terms -->`
3			`<!-- and conditions set forth in the Open Publication License, v1.0 -->`
4			`<!-- or later (the latest version is presently available at -->`
5			`<!-- http://www.opencontent.org/openpub/). -->`
6			`<!-- Distribution of the work or derivative of the work in any -->`
7			`<!-- standard (paper) book form is prohibited unless prior -->`
8			`<!-- permission is obtained from the copyright holder. -->`
9			`<HTML`
10			`><HEAD`
11			`><TITLE`
12			`>HAL Interfaces</TITLE`
13			`><meta name="MSSmartTagsPreventParsing" content="TRUE">`
14			`<META`
15			`NAME="GENERATOR"`
16			`CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+`
17			`"><LINK`
18			`REL="HOME"`
19			`TITLE="eCos Reference Manual"`
20			`HREF="ecos-ref.html"><LINK`
21			`REL="UP"`
22			`TITLE="The eCos Hardware Abstraction Layer (HAL)"`
23			`HREF="the-ecos-hardware-abstraction-layer.html"><LINK`
24			`REL="PREVIOUS"`
25			`TITLE="General principles"`
26			`HREF="hal-general-principles.html"><LINK`
27			`REL="NEXT"`
28			`TITLE="Architecture Characterization"`
29			`HREF="hal-architecture-characterization.html"></HEAD`
30			`><BODY`
31			`CLASS="CHAPTER"`
32			`BGCOLOR="#FFFFFF"`
33			`TEXT="#000000"`
34			`LINK="#0000FF"`
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36			`ALINK="#0000FF"`
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39			`><TABLE`
40			`SUMMARY="Header navigation table"`
41			`WIDTH="100%"`
42			`BORDER="0"`
43			`CELLPADDING="0"`
44			`CELLSPACING="0"`
45			`><TR`
46			`><TH`
47			`COLSPAN="3"`
48			`ALIGN="center"`
49			`>eCos Reference Manual</TH`
50			`></TR`
51			`><TR`
52			`><TD`
53			`WIDTH="10%"`
54			`ALIGN="left"`
55			`VALIGN="bottom"`
56			`><A`
57			`HREF="hal-general-principles.html"`
58			`ACCESSKEY="P"`
59			`>Prev</A`
60			`></TD`
61			`><TD`
62			`WIDTH="80%"`
63			`ALIGN="center"`
64			`VALIGN="bottom"`
65			`></TD`
66			`><TD`
67			`WIDTH="10%"`
68			`ALIGN="right"`
69			`VALIGN="bottom"`
70			`><A`
71			`HREF="hal-architecture-characterization.html"`
72			`ACCESSKEY="N"`
73			`>Next</A`
74			`></TD`
75			`></TR`
76			`></TABLE`
77			`><HR`
78			`ALIGN="LEFT"`
79			`WIDTH="100%"></DIV`
80			`><DIV`
81			`CLASS="CHAPTER"`
82			`><H1`
83			`><A`
84			`NAME="HAL-INTERFACES">Chapter 9. HAL Interfaces</H1`
85			`><DIV`
86			`CLASS="TOC"`
87			`><DL`
88			`><DT`
89			`><B`
90			`>Table of Contents</B`
91			`></DT`
92			`><DT`
93			`><A`
94			`HREF="hal-interfaces.html#HAL-BASE-DEFINITIONS"`
95			`>Base Definitions</A`
96			`></DT`
97			`><DT`
98			`><A`
99			`HREF="hal-architecture-characterization.html"`
100			`>Architecture Characterization</A`
101			`></DT`
102			`><DT`
103			`><A`
104			`HREF="hal-interrupt-handling.html"`
105			`>Interrupt Handling</A`
106			`></DT`
107			`><DT`
108			`><A`
109			`HREF="hal-input-and-output.html"`
110			`>HAL I/O</A`
111			`></DT`
112			`><DT`
113			`><A`
114			`HREF="hal-cache-control.html"`
115			`>Cache Control</A`
116			`></DT`
117			`><DT`
118			`><A`
119			`HREF="hal-linker-scripts.html"`
120			`>Linker Scripts</A`
121			`></DT`
122			`><DT`
123			`><A`
124			`HREF="hal-diagnostic-support.html"`
125			`>Diagnostic Support</A`
126			`></DT`
127			`><DT`
128			`><A`
129			`HREF="hal-smp-support.html"`
130			`>SMP Support</A`
131			`></DT`
132			`></DL`
133			`></DIV`
134			`><P`
135			`>This section describes the main HAL interfaces. </P`
136			`><DIV`
137			`CLASS="SECTION"`
138			`><H1`
139			`CLASS="SECTION"`
140			`><A`
141			`NAME="HAL-BASE-DEFINITIONS">Base Definitions</H1`
142			`><P`
143			`>These are definitions that characterize the properties of the base`
144			`architecture that are used to compile the portable parts of the`
145			`kernel. They are concerned with such things a portable type`
146			`definitions, endianness, and labeling.</P`
147			`><P`
148			`>These definitions are supplied by the`
149			`<TT`
150			`CLASS="FILENAME"`
151			`>cyg/hal/basetype.h</TT`
152			`> header file which is supplied`
153			`by the architecture HAL. It is included automatically by`
154			`<TT`
155			`CLASS="FILENAME"`
156			`>cyg/infra/cyg_type.h</TT`
157			`>.</P`
158			`><DIV`
159			`CLASS="SECTION"`
160			`><H2`
161			`CLASS="SECTION"`
162			`><A`
163			`NAME="AEN7743">Byte order</H2`
164			`><P`
165			`></P`
166			`><DIV`
167			`CLASS="VARIABLELIST"`
168			`><DL`
169			`><DT`
170			`><TT`
171			`CLASS="VARNAME"`
172			`>CYG_BYTEORDER</TT`
173			`></DT`
174			`><DD`
175			`><P`
176			`> This defines the byte order of the target and must be set to either`
177			`<TT`
178			`CLASS="VARNAME"`
179			`>CYG_LSBFIRST</TT`
180			`> or <TT`
181			`CLASS="VARNAME"`
182			`>CYG_MSBFIRST</TT`
183			`>.`
184			`</P`
185			`></DD`
186			`></DL`
187			`></DIV`
188			`></DIV`
189			`><DIV`
190			`CLASS="SECTION"`
191			`><H2`
192			`CLASS="SECTION"`
193			`><A`
194			`NAME="AEN7753">Label Translation</H2`
195			`><P`
196			`></P`
197			`><DIV`
198			`CLASS="VARIABLELIST"`
199			`><DL`
200			`><DT`
201			`><TT`
202			`CLASS="FUNCTION"`
203			`>CYG_LABEL_NAME(name)</TT`
204			`></DT`
205			`><DD`
206			`><P`
207			`> This is a wrapper used in some C and C++ files which`
208			`use labels defined in assembly code or the linker script.`
209			`It need only be defined if the default implementation in`
210			`<TT`
211			`CLASS="FILENAME"`
212			`>cyg/infra/cyg_type.h</TT`
213			`>, which passes the name`
214			`argument unaltered, is inadequate. It should be paired with`
215			`<TT`
216			`CLASS="FUNCTION"`
217			`>CYG_LABEL_DEFN()</TT`
218			`>.`
219			`</P`
220			`></DD`
221			`><DT`
222			`><TT`
223			`CLASS="FUNCTION"`
224			`>CYG_LABEL_DEFN(name)</TT`
225			`></DT`
226			`><DD`
227			`><P`
228			`> This is a wrapper used in assembler sources and linker scripts`
229			`which define labels. It need only be defined if the default`
230			`implementation in`
231			`<TT`
232			`CLASS="FILENAME"`
233			`>cyg/infra/cyg_type.h</TT`
234			`>, which passes the name`
235			`argument unaltered, is inadequate. The most usual alternative`
236			`definition of this macro prepends an underscore to the label`
237			`name.`
238			`</P`
239			`></DD`
240			`></DL`
241			`></DIV`
242			`></DIV`
243			`><DIV`
244			`CLASS="SECTION"`
245			`><H2`
246			`CLASS="SECTION"`
247			`><A`
248			`NAME="AEN7769">Base types</H2`
249			`><TABLE`
250			`BORDER="5"`
251			`BGCOLOR="#E0E0F0"`
252			`WIDTH="70%"`
253			`><TR`
254			`><TD`
255			`><PRE`
256			`CLASS="PROGRAMLISTING"`
257			`> cyg_halint8`
258			`cyg_halint16`
259			`cyg_halint32`
260			`cyg_halint64`
261			`cyg_halcount8`
262			`cyg_halcount16`
263			`cyg_halcount32`
264			`cyg_halcount64`
265			`cyg_halbool</PRE`
266			`></TD`
267			`></TR`
268			`></TABLE`
269			`><P`
270			`>These macros define the C base types that should be used to define`
271			`variables of the given size. They only need to be defined if the`
272			`default types specified in <TT`
273			`CLASS="FILENAME"`
274			`>cyg/infra/cyg_type.h</TT`
275			`>`
276			`cannot be used. Note that these are only the base types, they will be`
277			`composed with <TT`
278			`CLASS="LITERAL"`
279			`>signed</TT`
280			`> and`
281			`<TT`
282			`CLASS="LITERAL"`
283			`>unsigned</TT`
284			`> to form full type specifications.</P`
285			`></DIV`
286			`><DIV`
287			`CLASS="SECTION"`
288			`><H2`
289			`CLASS="SECTION"`
290			`><A`
291			`NAME="AEN7776">Atomic types</H2`
292			`><TABLE`
293			`BORDER="5"`
294			`BGCOLOR="#E0E0F0"`
295			`WIDTH="70%"`
296			`><TR`
297			`><TD`
298			`><PRE`
299			`CLASS="PROGRAMLISTING"`
300			`> cyg_halatomic CYG_ATOMIC</PRE`
301			`></TD`
302			`></TR`
303			`></TABLE`
304			`><P`
305			`>These types are guaranteed to be read or written in a single`
306			`uninterruptible operation. It is architecture defined what size this`
307			`type is, but it will be at least a byte.</P`
308			`></DIV`
309			`></DIV`
310			`></DIV`
311			`><DIV`
312			`CLASS="NAVFOOTER"`
313			`><HR`
314			`ALIGN="LEFT"`
315			`WIDTH="100%"><TABLE`
316			`SUMMARY="Footer navigation table"`
317			`WIDTH="100%"`
318			`BORDER="0"`
319			`CELLPADDING="0"`
320			`CELLSPACING="0"`
321			`><TR`
322			`><TD`
323			`WIDTH="33%"`
324			`ALIGN="left"`
325			`VALIGN="top"`
326			`><A`
327			`HREF="hal-general-principles.html"`
328			`ACCESSKEY="P"`
329			`>Prev</A`
330			`></TD`
331			`><TD`
332			`WIDTH="34%"`
333			`ALIGN="center"`
334			`VALIGN="top"`
335			`><A`
336			`HREF="ecos-ref.html"`
337			`ACCESSKEY="H"`
338			`>Home</A`
339			`></TD`
340			`><TD`
341			`WIDTH="33%"`
342			`ALIGN="right"`
343			`VALIGN="top"`
344			`><A`
345			`HREF="hal-architecture-characterization.html"`
346			`ACCESSKEY="N"`
347			`>Next</A`
348			`></TD`
349			`></TR`
350			`><TR`
351			`><TD`
352			`WIDTH="33%"`
353			`ALIGN="left"`
354			`VALIGN="top"`
355			`>General principles</TD`
356			`><TD`
357			`WIDTH="34%"`
358			`ALIGN="center"`
359			`VALIGN="top"`
360			`><A`
361			`HREF="the-ecos-hardware-abstraction-layer.html"`
362			`ACCESSKEY="U"`
363			`>Up</A`
364			`></TD`
365			`><TD`
366			`WIDTH="33%"`
367			`ALIGN="right"`
368			`VALIGN="top"`
369			`>Architecture Characterization</TD`
370			`></TR`
371			`></TABLE`
372			`></DIV`
373			`></BODY`
374			`></HTML`
375			`>`

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