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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><TITLE
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>HAL Structure</TITLE
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TITLE=" Porting Guide"
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TITLE=" Porting Guide"
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TITLE="Virtual Vectors (eCos/ROM Monitor Calling Interface)"
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CELLPADDING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>eCos Reference Manual</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="hal-porting-guide.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 11. Porting Guide</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="hal-calling-if.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="SECTION"
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><H1
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CLASS="SECTION"
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><A
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NAME="HAL-PORTING-STRUCTURE">HAL Structure</H1
86 
><P
87 
>In order to write an eCos HAL it's a good idea to have at least a
88 
passing understanding of how the HAL interacts with the rest of the
89 
system.</P
90 
><DIV
91 
CLASS="SECTION"
92 
><H2
93 
CLASS="SECTION"
94 
><A
95 
NAME="AEN8659">HAL Classes</H2
96 
><P
97 
>The eCos HAL consists of four HAL sub-classes. This table gives a
98 
brief description of each class and partly reiterates the description
99 
in <A
100 
HREF="hal-architecture-variant-and-platform.html"
101 
>Chapter 7</A
102 
>. The links
103 
refer to the on-line CVS tree (specifically to the sub-HALs used by
104 
the PowerPC MBX target).</P
105 
><DIV
106 
CLASS="INFORMALTABLE"
107 
><A
108 
NAME="AEN8663"><P
109 
></P
110 
><TABLE
111 
BORDER="1"
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CLASS="CALSTABLE"
113 
><THEAD
114 
><TR
115 
><TH
116 
ALIGN="LEFT"
117 
VALIGN="TOP"
118 
>HAL type</TH
119 
><TH
120 
ALIGN="LEFT"
121 
VALIGN="TOP"
122 
>Description</TH
123 
><TH
124 
ALIGN="LEFT"
125 
VALIGN="TOP"
126 
>Functionality Overview</TH
127 
></TR
128 
></THEAD
129 
><TBODY
130 
><TR
131 
><TD
132 
ALIGN="LEFT"
133 
VALIGN="TOP"
134 
>Common HAL <A
135 
HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/common/current?cvsroot=ecos"
136 
TARGET="_top"
137 
>(hal/common)</A
138 
></TD
139 
><TD
140 
ALIGN="LEFT"
141 
VALIGN="TOP"
142 
>Configuration options and functionality shared by all HALs.</TD
143 
><TD
144 
ALIGN="LEFT"
145 
VALIGN="TOP"
146 
>Generic debugging functionality, driver API, eCos/ROM monitor
147 
      calling interface, and tests.</TD
148 
></TR
149 
><TR
150 
><TD
151 
ALIGN="LEFT"
152 
VALIGN="TOP"
153 
>Architecture HAL <A
154 
HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/arch/current?cvsroot=ecos"
155 
TARGET="_top"
156 
>(hal/&lt;architecture&gt;/arch)</A
157 
></TD
158 
><TD
159 
ALIGN="LEFT"
160 
VALIGN="TOP"
161 
>Functionality specific to the given architecture. Also default
162 
  implementations of some functionality which can be overridden by
163 
  variant or platform HALs.</TD
164 
><TD
165 
ALIGN="LEFT"
166 
VALIGN="TOP"
167 
>Architecture specific debugger functionality (handles single
168 
     stepping, exception-to-signal conversion, etc.),
169 
     exception/interrupt vector definitions and handlers, cache
170 
     definition and control macros, context switching code, assembler
171 
     functions for early system initialization, configuration options,
172 
     and possibly tests. </TD
173 
></TR
174 
><TR
175 
><TD
176 
ALIGN="LEFT"
177 
VALIGN="TOP"
178 
>Variant HAL <A
179 
HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/mpc8xx/current?cvsroot=ecos"
180 
TARGET="_top"
181 
>(hal/&lt;architecture&gt;/&lt;variant&gt;)</A
182 
></TD
183 
><TD
184 
ALIGN="LEFT"
185 
VALIGN="TOP"
186 
>Some CPU architectures consist of a number variants, for example
187 
     MIPS CPUs come in both 32 and 64 bit versions, and some variants
188 
     have embedded features additional to the CPU core.</TD
189 
><TD
190 
ALIGN="LEFT"
191 
VALIGN="TOP"
192 
>Variant extensions to the architecture code (cache,
193 
     exception/interrupt), configuration options, possibly drivers for
194 
     variant on-core devices, and possibly tests.</TD
195 
></TR
196 
><TR
197 
><TD
198 
ALIGN="LEFT"
199 
VALIGN="TOP"
200 
>Platform HAL <A
201 
HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/mbx/current?cvsroot=ecos"
202 
TARGET="_top"
203 
>(hal/&lt;architecture&gt;/&lt;platform&gt;)</A
204 
></TD
205 
><TD
206 
ALIGN="LEFT"
207 
VALIGN="TOP"
208 
>Contains functionality and configuration options specific to the
209 
      platform.</TD
210 
><TD
211 
ALIGN="LEFT"
212 
VALIGN="TOP"
213 
>Early platform initialization code, platform memory layout
214 
     specification, configuration options (processor speed, compiler
215 
     options), diagnostic IO functions, debugger IO functions,
216 
     platform specific extensions to architecture or variant code
217 
     (off-core interrupt controller), and possibly tests.</TD
218 
></TR
219 
><TR
220 
><TD
221 
ALIGN="LEFT"
222 
VALIGN="TOP"
223 
>Auxiliary HAL <A
224 
HREF="http://sourceware.cygnus.com/cgi-bin/cvsweb.cgi/ecos/packages/hal/powerpc/quicc/current?cvsroot=ecos"
225 
TARGET="_top"
226 
>(hal/&lt;architecture&gt;/&lt;module&gt;)</A
227 
></TD
228 
><TD
229 
ALIGN="LEFT"
230 
VALIGN="TOP"
231 
>Some variants share common modules on the core. Motorola's PowerPC
232 
      QUICC is an example of such a module.</TD
233 
><TD
234 
ALIGN="LEFT"
235 
VALIGN="TOP"
236 
>Module specific functionality (interrupt controller, simple
237 
      device drivers), possibly tests.</TD
238 
></TR
239 
></TBODY
240 
></TABLE
241 
><P
242 
></P
243 
></DIV
244 
></DIV
245 
><DIV
246 
CLASS="SECTION"
247 
><H2
248 
CLASS="SECTION"
249 
><A
250 
NAME="AEN8696">File Descriptions</H2
251 
><P
252 
>Listed below are the files found in various HALs, with a short
253 
description of what each file contains. When looking in existing HALs
254 
beware that they do not necessarily follow this naming scheme.
255 
If you are writing a new HAL, please try to follow it as
256 
closely as possible. Still, no two targets are the same, so sometimes
257 
it makes sense to use additional files.</P
258 
><DIV
259 
CLASS="SECTION"
260 
><H3
261 
CLASS="SECTION"
262 
><A
263 
NAME="AEN8699">Common HAL</H3
264 
><DIV
265 
CLASS="INFORMALTABLE"
266 
><A
267 
NAME="AEN8701"><P
268 
></P
269 
><TABLE
270 
BORDER="1"
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CLASS="CALSTABLE"
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><THEAD
273 
><TR
274 
><TH
275 
ALIGN="LEFT"
276 
VALIGN="TOP"
277 
>File</TH
278 
><TH
279 
ALIGN="LEFT"
280 
VALIGN="TOP"
281 
>Description</TH
282 
></TR
283 
></THEAD
284 
><TBODY
285 
><TR
286 
><TD
287 
ALIGN="LEFT"
288 
VALIGN="TOP"
289 
><TT
290 
CLASS="FILENAME"
291 
>include/dbg-thread-syscall.h</TT
292 
></TD
293 
><TD
294 
ALIGN="LEFT"
295 
VALIGN="TOP"
296 
>Defines the thread debugging syscall function. This is used by
297 
  the ROM monitor to access the thread debugging API in the RAM
298 
  application.  .</TD
299 
></TR
300 
><TR
301 
><TD
302 
ALIGN="LEFT"
303 
VALIGN="TOP"
304 
><TT
305 
CLASS="FILENAME"
306 
>include/dbg-threads-api.h</TT
307 
></TD
308 
><TD
309 
ALIGN="LEFT"
310 
VALIGN="TOP"
311 
>Defines the thread debugging API. .</TD
312 
></TR
313 
><TR
314 
><TD
315 
ALIGN="LEFT"
316 
VALIGN="TOP"
317 
><TT
318 
CLASS="FILENAME"
319 
>include/drv_api.h</TT
320 
></TD
321 
><TD
322 
ALIGN="LEFT"
323 
VALIGN="TOP"
324 
>Defines the driver API.</TD
325 
></TR
326 
><TR
327 
><TD
328 
ALIGN="LEFT"
329 
VALIGN="TOP"
330 
><TT
331 
CLASS="FILENAME"
332 
>include/generic-stub.h</TT
333 
></TD
334 
><TD
335 
ALIGN="LEFT"
336 
VALIGN="TOP"
337 
>Defines the generic stub features.</TD
338 
></TR
339 
><TR
340 
><TD
341 
ALIGN="LEFT"
342 
VALIGN="TOP"
343 
><TT
344 
CLASS="FILENAME"
345 
>include/hal_if.h</TT
346 
></TD
347 
><TD
348 
ALIGN="LEFT"
349 
VALIGN="TOP"
350 
>Defines the ROM/RAM calling interface API.</TD
351 
></TR
352 
><TR
353 
><TD
354 
ALIGN="LEFT"
355 
VALIGN="TOP"
356 
><TT
357 
CLASS="FILENAME"
358 
>include/hal_misc.h</TT
359 
></TD
360 
><TD
361 
ALIGN="LEFT"
362 
VALIGN="TOP"
363 
>Defines miscellaneous helper functions shared by all HALs.</TD
364 
></TR
365 
><TR
366 
><TD
367 
ALIGN="LEFT"
368 
VALIGN="TOP"
369 
><TT
370 
CLASS="FILENAME"
371 
>include/hal_stub.h</TT
372 
></TD
373 
><TD
374 
ALIGN="LEFT"
375 
VALIGN="TOP"
376 
>Defines eCos mappings of GDB stub features.</TD
377 
></TR
378 
><TR
379 
><TD
380 
ALIGN="LEFT"
381 
VALIGN="TOP"
382 
><TT
383 
CLASS="FILENAME"
384 
>src/dbg-threads-syscall.c</TT
385 
></TD
386 
><TD
387 
ALIGN="LEFT"
388 
VALIGN="TOP"
389 
>Thread debugging implementation.</TD
390 
></TR
391 
><TR
392 
><TD
393 
ALIGN="LEFT"
394 
VALIGN="TOP"
395 
><TT
396 
CLASS="FILENAME"
397 
>src/drv_api.c</TT
398 
></TD
399 
><TD
400 
ALIGN="LEFT"
401 
VALIGN="TOP"
402 
>Driver API implementation. Depending on configuration this
403 
  provides either wrappers for the kernel API, or a minimal
404 
  implementation of these features. This allows drivers to be written
405 
  relying only on HAL features.</TD
406 
></TR
407 
><TR
408 
><TD
409 
ALIGN="LEFT"
410 
VALIGN="TOP"
411 
><TT
412 
CLASS="FILENAME"
413 
>src/dummy.c</TT
414 
></TD
415 
><TD
416 
ALIGN="LEFT"
417 
VALIGN="TOP"
418 
>Empty dummy file ensuring creation of libtarget.a.</TD
419 
></TR
420 
><TR
421 
><TD
422 
ALIGN="LEFT"
423 
VALIGN="TOP"
424 
><TT
425 
CLASS="FILENAME"
426 
>src/generic-stub.c</TT
427 
></TD
428 
><TD
429 
ALIGN="LEFT"
430 
VALIGN="TOP"
431 
>Generic GDB stub implementation. This provides the
432 
  communication protocol used to communicate with GDB over a serial
433 
  device or via the network.</TD
434 
></TR
435 
><TR
436 
><TD
437 
ALIGN="LEFT"
438 
VALIGN="TOP"
439 
><TT
440 
CLASS="FILENAME"
441 
>src/hal_if.c</TT
442 
></TD
443 
><TD
444 
ALIGN="LEFT"
445 
VALIGN="TOP"
446 
>ROM/RAM calling interface implementation. Provides wrappers from
447 
  the calling interface API to the eCos features used for the
448 
  implementation.</TD
449 
></TR
450 
><TR
451 
><TD
452 
ALIGN="LEFT"
453 
VALIGN="TOP"
454 
><TT
455 
CLASS="FILENAME"
456 
>src/hal_misc.c</TT
457 
></TD
458 
><TD
459 
ALIGN="LEFT"
460 
VALIGN="TOP"
461 
>Various helper functions shared by all platforms and
462 
  architectures.</TD
463 
></TR
464 
><TR
465 
><TD
466 
ALIGN="LEFT"
467 
VALIGN="TOP"
468 
><TT
469 
CLASS="FILENAME"
470 
>src/hal_stub.c</TT
471 
></TD
472 
><TD
473 
ALIGN="LEFT"
474 
VALIGN="TOP"
475 
>Wrappers from eCos HAL features to the features required by the
476 
  generic GDB stub.</TD
477 
></TR
478 
><TR
479 
><TD
480 
ALIGN="LEFT"
481 
VALIGN="TOP"
482 
><TT
483 
CLASS="FILENAME"
484 
>src/stubrom/stubrom.c</TT
485 
></TD
486 
><TD
487 
ALIGN="LEFT"
488 
VALIGN="TOP"
489 
>The file used to build eCos GDB stub images. Basically a
490 
  cyg_start function with a hard coded breakpoint.</TD
491 
></TR
492 
><TR
493 
><TD
494 
ALIGN="LEFT"
495 
VALIGN="TOP"
496 
><TT
497 
CLASS="FILENAME"
498 
>src/thread-packets.c</TT
499 
></TD
500 
><TD
501 
ALIGN="LEFT"
502 
VALIGN="TOP"
503 
>More thread debugging related functions.</TD
504 
></TR
505 
><TR
506 
><TD
507 
ALIGN="LEFT"
508 
VALIGN="TOP"
509 
><TT
510 
CLASS="FILENAME"
511 
>src/thread-pkts.h</TT
512 
></TD
513 
><TD
514 
ALIGN="LEFT"
515 
VALIGN="TOP"
516 
>Defines more thread debugging related function.</TD
517 
></TR
518 
></TBODY
519 
></TABLE
520 
><P
521 
></P
522 
></DIV
523 
></DIV
524 
><DIV
525 
CLASS="SECTION"
526 
><H3
527 
CLASS="SECTION"
528 
><A
529 
NAME="AEN8776">Architecture HAL</H3
530 
><P
531 
>Some architecture HALs may add extra files for architecture
532 
specific serial drivers, or for handling interrupts and exceptions if it
533 
makes sense.</P
534 
><P
535 
>Note that many of the definitions in these files are only
536 
conditionally defined - if the equivalent variant or platform headers
537 
provide the definitions, those override the generic architecture
538 
definitions.</P
539 
><DIV
540 
CLASS="INFORMALTABLE"
541 
><A
542 
NAME="AEN8780"><P
543 
></P
544 
><TABLE
545 
BORDER="1"
546 
CLASS="CALSTABLE"
547 
><THEAD
548 
><TR
549 
><TH
550 
ALIGN="LEFT"
551 
VALIGN="TOP"
552 
>File</TH
553 
><TH
554 
ALIGN="LEFT"
555 
VALIGN="TOP"
556 
>Description</TH
557 
></TR
558 
></THEAD
559 
><TBODY
560 
><TR
561 
><TD
562 
ALIGN="LEFT"
563 
VALIGN="TOP"
564 
><TT
565 
CLASS="FILENAME"
566 
>include/arch.inc</TT
567 
></TD
568 
><TD
569 
ALIGN="LEFT"
570 
VALIGN="TOP"
571 
>Various assembly macros used during system initialization.</TD
572 
></TR
573 
><TR
574 
><TD
575 
ALIGN="LEFT"
576 
VALIGN="TOP"
577 
><TT
578 
CLASS="FILENAME"
579 
>include/basetype.h</TT
580 
></TD
581 
><TD
582 
ALIGN="LEFT"
583 
VALIGN="TOP"
584 
>Endian, label, alignment, and type size definitions. These
585 
  override common defaults in CYGPKG_INFRA.</TD
586 
></TR
587 
><TR
588 
><TD
589 
ALIGN="LEFT"
590 
VALIGN="TOP"
591 
><TT
592 
CLASS="FILENAME"
593 
>include/hal_arch.h</TT
594 
></TD
595 
><TD
596 
ALIGN="LEFT"
597 
VALIGN="TOP"
598 
>Saved register frame format, various thread, register and stack
599 
  related macros.</TD
600 
></TR
601 
><TR
602 
><TD
603 
ALIGN="LEFT"
604 
VALIGN="TOP"
605 
><TT
606 
CLASS="FILENAME"
607 
>include/hal_cache.h</TT
608 
></TD
609 
><TD
610 
ALIGN="LEFT"
611 
VALIGN="TOP"
612 
>Cache definitions and cache control macros.</TD
613 
></TR
614 
><TR
615 
><TD
616 
ALIGN="LEFT"
617 
VALIGN="TOP"
618 
><TT
619 
CLASS="FILENAME"
620 
>include/hal_intr.h</TT
621 
></TD
622 
><TD
623 
ALIGN="LEFT"
624 
VALIGN="TOP"
625 
>Exception and interrupt definitions. Macros for configuring and
626 
  controlling interrupts. eCos real-time clock control macros.</TD
627 
></TR
628 
><TR
629 
><TD
630 
ALIGN="LEFT"
631 
VALIGN="TOP"
632 
><TT
633 
CLASS="FILENAME"
634 
>include/hal_io.h</TT
635 
></TD
636 
><TD
637 
ALIGN="LEFT"
638 
VALIGN="TOP"
639 
>Macros for accessing IO devices.</TD
640 
></TR
641 
><TR
642 
><TD
643 
ALIGN="LEFT"
644 
VALIGN="TOP"
645 
><TT
646 
CLASS="FILENAME"
647 
>include/&lt;arch&gt;_regs.h</TT
648 
></TD
649 
><TD
650 
ALIGN="LEFT"
651 
VALIGN="TOP"
652 
>Architecture register definitions.</TD
653 
></TR
654 
><TR
655 
><TD
656 
ALIGN="LEFT"
657 
VALIGN="TOP"
658 
><TT
659 
CLASS="FILENAME"
660 
>include/&lt;arch&gt;_stub.h</TT
661 
></TD
662 
><TD
663 
ALIGN="LEFT"
664 
VALIGN="TOP"
665 
>Architecture stub definitions. In particular the register frame
666 
  layout used by GDB. This may differ from the one used by eCos.</TD
667 
></TR
668 
><TR
669 
><TD
670 
ALIGN="LEFT"
671 
VALIGN="TOP"
672 
><TT
673 
CLASS="FILENAME"
674 
>include/&lt;arch&gt;.inc</TT
675 
></TD
676 
><TD
677 
ALIGN="LEFT"
678 
VALIGN="TOP"
679 
>Architecture convenience assembly macros.</TD
680 
></TR
681 
><TR
682 
><TD
683 
ALIGN="LEFT"
684 
VALIGN="TOP"
685 
><TT
686 
CLASS="FILENAME"
687 
>src/&lt;arch&gt;.ld</TT
688 
></TD
689 
><TD
690 
ALIGN="LEFT"
691 
VALIGN="TOP"
692 
>Linker macros.</TD
693 
></TR
694 
><TR
695 
><TD
696 
ALIGN="LEFT"
697 
VALIGN="TOP"
698 
><TT
699 
CLASS="FILENAME"
700 
>src/context.S</TT
701 
></TD
702 
><TD
703 
ALIGN="LEFT"
704 
VALIGN="TOP"
705 
>Functions handling context switching and setjmp/longjmp.</TD
706 
></TR
707 
><TR
708 
><TD
709 
ALIGN="LEFT"
710 
VALIGN="TOP"
711 
><TT
712 
CLASS="FILENAME"
713 
>src/hal_misc.c</TT
714 
></TD
715 
><TD
716 
ALIGN="LEFT"
717 
VALIGN="TOP"
718 
>Exception and interrupt handlers in C. Various other utility
719 
  functions.</TD
720 
></TR
721 
><TR
722 
><TD
723 
ALIGN="LEFT"
724 
VALIGN="TOP"
725 
><TT
726 
CLASS="FILENAME"
727 
>src/hal_mk_defs.c</TT
728 
></TD
729 
><TD
730 
ALIGN="LEFT"
731 
VALIGN="TOP"
732 
>Used to export definitions from C header files to assembler
733 
  header files.</TD
734 
></TR
735 
><TR
736 
><TD
737 
ALIGN="LEFT"
738 
VALIGN="TOP"
739 
><TT
740 
CLASS="FILENAME"
741 
>src/hal_intr.c</TT
742 
></TD
743 
><TD
744 
ALIGN="LEFT"
745 
VALIGN="TOP"
746 
>Any necessary interrupt handling functions.</TD
747 
></TR
748 
><TR
749 
><TD
750 
ALIGN="LEFT"
751 
VALIGN="TOP"
752 
><TT
753 
CLASS="FILENAME"
754 
>src/&lt;arch&gt;stub.c</TT
755 
></TD
756 
><TD
757 
ALIGN="LEFT"
758 
VALIGN="TOP"
759 
>Architecture stub code. Contains functions for translating eCos
760 
  exceptions to UNIX signals and functions for single-stepping.</TD
761 
></TR
762 
><TR
763 
><TD
764 
ALIGN="LEFT"
765 
VALIGN="TOP"
766 
><TT
767 
CLASS="FILENAME"
768 
>src/vectors.S</TT
769 
></TD
770 
><TD
771 
ALIGN="LEFT"
772 
VALIGN="TOP"
773 
>Exception, interrupt and early initialization code.</TD
774 
></TR
775 
></TBODY
776 
></TABLE
777 
><P
778 
></P
779 
></DIV
780 
></DIV
781 
><DIV
782 
CLASS="SECTION"
783 
><H3
784 
CLASS="SECTION"
785 
><A
786 
NAME="AEN8851">Variant HAL</H3
787 
><P
788 
>Some variant HALs may add extra files for variant specific serial
789 
drivers, or for handling interrupts/exceptions if it makes sense.</P
790 
><P
791 
>Note that these files may be mostly empty if the CPU variant can be
792 
controlled by the generic architecture macros. The definitions present
793 
are only conditionally defined - if the equivalent platform headers
794 
provide the definitions, those override the variant definitions.</P
795 
><DIV
796 
CLASS="INFORMALTABLE"
797 
><A
798 
NAME="AEN8855"><P
799 
></P
800 
><TABLE
801 
BORDER="1"
802 
CLASS="CALSTABLE"
803 
><THEAD
804 
><TR
805 
><TH
806 
ALIGN="LEFT"
807 
VALIGN="TOP"
808 
>File</TH
809 
><TH
810 
ALIGN="LEFT"
811 
VALIGN="TOP"
812 
>Description</TH
813 
></TR
814 
></THEAD
815 
><TBODY
816 
><TR
817 
><TD
818 
ALIGN="LEFT"
819 
VALIGN="TOP"
820 
><TT
821 
CLASS="FILENAME"
822 
>include/var_arch.h</TT
823 
></TD
824 
><TD
825 
ALIGN="LEFT"
826 
VALIGN="TOP"
827 
>Saved register frame format, various thread, register and stack
828 
  related macros.</TD
829 
></TR
830 
><TR
831 
><TD
832 
ALIGN="LEFT"
833 
VALIGN="TOP"
834 
><TT
835 
CLASS="FILENAME"
836 
>include/var_cache.h</TT
837 
></TD
838 
><TD
839 
ALIGN="LEFT"
840 
VALIGN="TOP"
841 
>Cache related macros.</TD
842 
></TR
843 
><TR
844 
><TD
845 
ALIGN="LEFT"
846 
VALIGN="TOP"
847 
><TT
848 
CLASS="FILENAME"
849 
>include/var_intr.h</TT
850 
></TD
851 
><TD
852 
ALIGN="LEFT"
853 
VALIGN="TOP"
854 
>Interrupt related macros.</TD
855 
></TR
856 
><TR
857 
><TD
858 
ALIGN="LEFT"
859 
VALIGN="TOP"
860 
><TT
861 
CLASS="FILENAME"
862 
>include/var_regs.h</TT
863 
></TD
864 
><TD
865 
ALIGN="LEFT"
866 
VALIGN="TOP"
867 
>Extra register definitions for the CPU variant.</TD
868 
></TR
869 
><TR
870 
><TD
871 
ALIGN="LEFT"
872 
VALIGN="TOP"
873 
><TT
874 
CLASS="FILENAME"
875 
>include/variant.inc</TT
876 
></TD
877 
><TD
878 
ALIGN="LEFT"
879 
VALIGN="TOP"
880 
>Various assembly macros used during system initialization.</TD
881 
></TR
882 
><TR
883 
><TD
884 
ALIGN="LEFT"
885 
VALIGN="TOP"
886 
><TT
887 
CLASS="FILENAME"
888 
>src/var_intr.c</TT
889 
></TD
890 
><TD
891 
ALIGN="LEFT"
892 
VALIGN="TOP"
893 
>Interrupt functions if necessary.</TD
894 
></TR
895 
><TR
896 
><TD
897 
ALIGN="LEFT"
898 
VALIGN="TOP"
899 
><TT
900 
CLASS="FILENAME"
901 
>src/var_misc.c</TT
902 
></TD
903 
><TD
904 
ALIGN="LEFT"
905 
VALIGN="TOP"
906 
>hal_variant_init function and any necessary extra functions.</TD
907 
></TR
908 
><TR
909 
><TD
910 
ALIGN="LEFT"
911 
VALIGN="TOP"
912 
><TT
913 
CLASS="FILENAME"
914 
>src/variant.S</TT
915 
></TD
916 
><TD
917 
ALIGN="LEFT"
918 
VALIGN="TOP"
919 
>Interrupt handler table definition.</TD
920 
></TR
921 
><TR
922 
><TD
923 
ALIGN="LEFT"
924 
VALIGN="TOP"
925 
><TT
926 
CLASS="FILENAME"
927 
>src/&lt;arch&gt;_&lt;variant&gt;.ld</TT
928 
></TD
929 
><TD
930 
ALIGN="LEFT"
931 
VALIGN="TOP"
932 
>Linker macros.</TD
933 
></TR
934 
></TBODY
935 
></TABLE
936 
><P
937 
></P
938 
></DIV
939 
></DIV
940 
><DIV
941 
CLASS="SECTION"
942 
><H3
943 
CLASS="SECTION"
944 
><A
945 
NAME="AEN8898">Platform HAL</H3
946 
><P
947 
>Extras files may be added for platform specific serial
948 
drivers. Extra files for handling interrupts and exceptions will be
949 
present if it makes sense.</P
950 
><DIV
951 
CLASS="INFORMALTABLE"
952 
><A
953 
NAME="AEN8901"><P
954 
></P
955 
><TABLE
956 
BORDER="1"
957 
CLASS="CALSTABLE"
958 
><THEAD
959 
><TR
960 
><TH
961 
ALIGN="LEFT"
962 
VALIGN="TOP"
963 
>File</TH
964 
><TH
965 
ALIGN="LEFT"
966 
VALIGN="TOP"
967 
>Description</TH
968 
></TR
969 
></THEAD
970 
><TBODY
971 
><TR
972 
><TD
973 
ALIGN="LEFT"
974 
VALIGN="TOP"
975 
><TT
976 
CLASS="FILENAME"
977 
>include/hal_diag.h</TT
978 
></TD
979 
><TD
980 
ALIGN="LEFT"
981 
VALIGN="TOP"
982 
>Defines functions used for HAL diagnostics output. This would
983 
  normally be the ROM calling interface wrappers, but may also be the
984 
  low-level IO functions themselves, saving a little overhead.</TD
985 
></TR
986 
><TR
987 
><TD
988 
ALIGN="LEFT"
989 
VALIGN="TOP"
990 
><TT
991 
CLASS="FILENAME"
992 
>include/platform.inc</TT
993 
></TD
994 
><TD
995 
ALIGN="LEFT"
996 
VALIGN="TOP"
997 
>Platform initialization code. This includes memory controller,
998 
  vectors, and monitor initialization. Depending on the architecture,
999 
  other things may need defining here as well: interrupt decoding,
1000 
  status register initialization value, etc.</TD
1001 
></TR
1002 
><TR
1003 
><TD
1004 
ALIGN="LEFT"
1005 
VALIGN="TOP"
1006 
><TT
1007 
CLASS="FILENAME"
1008 
>include/plf_cache.h</TT
1009 
></TD
1010 
><TD
1011 
ALIGN="LEFT"
1012 
VALIGN="TOP"
1013 
>Platform specific cache handling.</TD
1014 
></TR
1015 
><TR
1016 
><TD
1017 
ALIGN="LEFT"
1018 
VALIGN="TOP"
1019 
><TT
1020 
CLASS="FILENAME"
1021 
>include/plf_intr.h</TT
1022 
></TD
1023 
><TD
1024 
ALIGN="LEFT"
1025 
VALIGN="TOP"
1026 
>Platform specific interrupt handling.</TD
1027 
></TR
1028 
><TR
1029 
><TD
1030 
ALIGN="LEFT"
1031 
VALIGN="TOP"
1032 
><TT
1033 
CLASS="FILENAME"
1034 
>include/plf_io.h</TT
1035 
></TD
1036 
><TD
1037 
ALIGN="LEFT"
1038 
VALIGN="TOP"
1039 
>PCI IO definitions and macros. May also be used to override
1040 
  generic HAL IO macros if the platform endianness differs from that of
1041 
  the CPU.</TD
1042 
></TR
1043 
><TR
1044 
><TD
1045 
ALIGN="LEFT"
1046 
VALIGN="TOP"
1047 
><TT
1048 
CLASS="FILENAME"
1049 
>include/plf_stub.h</TT
1050 
></TD
1051 
><TD
1052 
ALIGN="LEFT"
1053 
VALIGN="TOP"
1054 
>Defines stub initializer and board reset details.</TD
1055 
></TR
1056 
><TR
1057 
><TD
1058 
ALIGN="LEFT"
1059 
VALIGN="TOP"
1060 
><TT
1061 
CLASS="FILENAME"
1062 
>src/hal_diag.c</TT
1063 
></TD
1064 
><TD
1065 
ALIGN="LEFT"
1066 
VALIGN="TOP"
1067 
>May contain the low-level device drivers. But these may also
1068 
  reside in plf_stub.c</TD
1069 
></TR
1070 
><TR
1071 
><TD
1072 
ALIGN="LEFT"
1073 
VALIGN="TOP"
1074 
><TT
1075 
CLASS="FILENAME"
1076 
>src/platform.S</TT
1077 
></TD
1078 
><TD
1079 
ALIGN="LEFT"
1080 
VALIGN="TOP"
1081 
>Memory controller setup macro, and if necessary interrupt
1082 
  springboard code.</TD
1083 
></TR
1084 
><TR
1085 
><TD
1086 
ALIGN="LEFT"
1087 
VALIGN="TOP"
1088 
><TT
1089 
CLASS="FILENAME"
1090 
>src/plf_misc.c</TT
1091 
></TD
1092 
><TD
1093 
ALIGN="LEFT"
1094 
VALIGN="TOP"
1095 
>Platform initialization code.</TD
1096 
></TR
1097 
><TR
1098 
><TD
1099 
ALIGN="LEFT"
1100 
VALIGN="TOP"
1101 
><TT
1102 
CLASS="FILENAME"
1103 
>src/plf_mk_defs.c</TT
1104 
></TD
1105 
><TD
1106 
ALIGN="LEFT"
1107 
VALIGN="TOP"
1108 
>Used to export definitions from C header files to assembler
1109 
  header files.</TD
1110 
></TR
1111 
><TR
1112 
><TD
1113 
ALIGN="LEFT"
1114 
VALIGN="TOP"
1115 
><TT
1116 
CLASS="FILENAME"
1117 
>src/plf_stub.c</TT
1118 
></TD
1119 
><TD
1120 
ALIGN="LEFT"
1121 
VALIGN="TOP"
1122 
>Platform specific stub initialization and possibly the low-level
1123 
  device driver.</TD
1124 
></TR
1125 
></TBODY
1126 
></TABLE
1127 
><P
1128 
></P
1129 
></DIV
1130 
><P
1131 
>The platform HAL also contains files specifying the platform's
1132 
memory layout. These files are located in
1133 
<TT
1134 
CLASS="FILENAME"
1135 
>include/pkgconf</TT
1136 
>.</P
1137 
></DIV
1138 
><DIV
1139 
CLASS="SECTION"
1140 
><H3
1141 
CLASS="SECTION"
1142 
><A
1143 
NAME="AEN8954">Auxiliary HAL</H3
1144 
><P
1145 
>Auxiliary HALs contain whatever files are necessary to provide the
1146 
required functionality. There are no predefined set of files required
1147 
in an auxiliary HAL.</P
1148 
></DIV
1149 
></DIV
1150 
></DIV
1151 
><DIV
1152 
CLASS="NAVFOOTER"
1153 
><HR
1154 
ALIGN="LEFT"
1155 
WIDTH="100%"><TABLE
1156 
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1157 
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1158 
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1159 
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1160 
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1161 
><TR
1162 
><TD
1163 
WIDTH="33%"
1164 
ALIGN="left"
1165 
VALIGN="top"
1166 
><A
1167 
HREF="hal-porting-guide.html"
1168 
ACCESSKEY="P"
1169 
>Prev</A
1170 
></TD
1171 
><TD
1172 
WIDTH="34%"
1173 
ALIGN="center"
1174 
VALIGN="top"
1175 
><A
1176 
HREF="ecos-ref.html"
1177 
ACCESSKEY="H"
1178 
>Home</A
1179 
></TD
1180 
><TD
1181 
WIDTH="33%"
1182 
ALIGN="right"
1183 
VALIGN="top"
1184 
><A
1185 
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1186 
ACCESSKEY="N"
1187 
>Next</A
1188 
></TD
1189 
></TR
1190 
><TR
1191 
><TD
1192 
WIDTH="33%"
1193 
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1194 
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1195 
>Porting Guide</TD
1196 
><TD
1197 
WIDTH="34%"
1198 
ALIGN="center"
1199 
VALIGN="top"
1200 
><A
1201 
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1202 
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1203 
>Up</A
1204 
></TD
1205 
><TD
1206 
WIDTH="33%"
1207 
ALIGN="right"
1208 
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1209 
>Virtual Vectors (eCos/ROM Monitor Calling Interface)</TD
1210 
></TR
1211 
></TABLE
1212 
></DIV
1213 
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1214 
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1215 
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