iPXE currently insists on residing in an even megabyte. This imposes undesirably severe constraints upon our PMM allocation strategy, and limits our options for mechanisms to access ROMs greater than 64kB in size. Add A20 handling code to libflat so that prefixes are able to access memory even in odd megabytes. The algorithms and tuning parameters in the new A20 handling code are based upon a mixture of the existing iPXE A20 code and the A20 code from the 2.6.32 Linux kernel. Signed-off-by: Michael Brown <mcb30@ipxe.org>tags/v1.20.1
|
|
||
512 |
|
512 |
|
513 |
|
513 |
|
514 |
|
514 |
|
515 |
|
|
|
|
515 |
|
|
516 |
|
516 |
|
517 |
|
517 |
|
518 |
|
518 |
|
519 |
|
|
|
|
519 |
|
|
520 |
|
520 |
|
521 |
|
|
|
|
521 |
|
|
|
522 |
|
|
|
523 |
|
|
|
524 |
|
|
|
525 |
|
|
|
526 |
|
|
|
527 |
|
|
|
528 |
|
|
|
529 |
|
|
|
530 |
|
|
|
531 |
|
|
|
532 |
|
|
522 |
|
533 |
|
523 |
|
534 |
|
524 |
|
535 |
|
|
|
||
570 |
|
581 |
|
571 |
|
582 |
|
572 |
|
583 |
|
|
584 |
|
|
573 |
|
585 |
|
574 |
|
586 |
|
575 |
|
|
|
576 |
|
587 |
|
|
588 |
|
|
577 |
|
589 |
|
578 |
|
590 |
|
579 |
|
|
|
580 |
|
591 |
|
581 |
|
592 |
|
582 |
|
593 |
|
|
|
||
24 |
|
24 |
|
25 |
|
25 |
|
26 |
|
26 |
|
27 |
|
|
|
|
27 |
|
|
28 |
|
28 |
|
29 |
|
29 |
|
30 |
|
30 |
|
|
|
||
63 |
|
63 |
|
64 |
|
64 |
|
65 |
|
65 |
|
66 |
|
|
|
67 |
|
66 |
|
68 |
|
67 |
|
69 |
|
68 |
|
|
|
||
126 |
|
125 |
|
127 |
|
126 |
|
128 |
|
127 |
|
129 |
|
|
|
|
128 |
|
|
130 |
|
129 |
|
131 |
|
130 |
|
132 |
|
131 |
|
|
|
||
139 |
|
138 |
|
140 |
|
139 |
|
141 |
|
140 |
|
|
141 |
|
|
|
142 |
|
|
|
143 |
|
|
|
144 |
|
|
|
145 |
|
|
|
146 |
|
|
|
147 |
|
|
|
148 |
|
|
|
149 |
|
|
|
150 |
|
|
|
151 |
|
|
|
152 |
|
|
|
153 |
|
|
|
154 |
|
|
|
155 |
|
|
|
156 |
|
|
|
157 |
|
|
|
158 |
|
|
|
159 |
|
|
|
160 |
|
|
|
161 |
|
|
|
162 |
|
|
|
163 |
|
|
|
164 |
|
|
|
165 |
|
|
|
166 |
|
|
|
167 |
|
|
|
168 |
|
|
|
169 |
|
|
|
170 |
|
|
|
171 |
|
|
|
172 |
|
|
|
173 |
|
|
|
174 |
|
|
|
175 |
|
|
|
176 |
|
|
|
177 |
|
|
|
178 |
|
|
|
179 |
|
|
|
180 |
|
|
|
181 |
|
|
|
182 |
|
|
|
183 |
|
|
|
184 |
|
|
|
185 |
|
|
|
186 |
|
|
|
187 |
|
|
|
188 |
|
|
|
189 |
|
|
|
190 |
|
|
|
191 |
|
|
|
192 |
|
|
|
193 |
|
|
|
194 |
|
|
|
195 |
|
|
|
196 |
|
|
|
197 |
|
|
|
198 |
|
|
|
199 |
|
|
|
200 |
|
|
|
201 |
|
|
|
202 |
|
|
|
203 |
|
|
|
204 |
|
|
|
205 |
|
|
|
206 |
|
|
|
207 |
|
|
|
208 |
|
|
|
209 |
|
|
|
210 |
|
|
|
211 |
|
|
|
212 |
|
|
|
213 |
|
|
|
214 |
|
|
|
215 |
|
|
|
216 |
|
|
|
217 |
|
|
|
218 |
|
|
|
219 |
|
|
|
220 |
|
|
|
221 |
|
|
|
222 |
|
|
|
223 |
|
|
|
224 |
|
|
|
225 |
|
|
|
226 |
|
|
|
227 |
|
|
|
228 |
|
|
|
229 |
|
|
|
230 |
|
|
|
231 |
|
|
|
232 |
|
|
|
233 |
|
|
|
234 |
|
|
|
235 |
|
|
|
236 |
|
|
|
237 |
|
|
|
238 |
|
|
|
239 |
|
|
|
240 |
|
|
|
241 |
|
|
|
242 |
|
|
|
243 |
|
|
|
244 |
|
|
|
245 |
|
|
|
246 |
|
|
|
247 |
|
|
|
248 |
|
|
|
249 |
|
|
|
250 |
|
|
|
251 |
|
|
|
252 |
|
|
|
253 |
|
|
|
254 |
|
|
|
255 |
|
|
|
256 |
|
|
|
257 |
|
|
|
258 |
|
|
|
259 |
|
|
|
260 |
|
|
|
261 |
|
|
|
262 |
|
|
|
263 |
|
|
|
264 |
|
|
|
265 |
|
|
|
266 |
|
|
|
267 |
|
|
|
268 |
|
|
|
269 |
|
|
|
270 |
|
|
|
271 |
|
|
|
272 |
|
|
|
273 |
|
|
|
274 |
|
|
|
275 |
|
|
|
276 |
|
|
|
277 |
|
|
|
278 |
|
|
|
279 |
|
|
|
280 |
|
|
|
281 |
|
|
|
282 |
|
|
|
283 |
|
|
|
284 |
|
|
|
285 |
|
|
|
286 |
|
|
|
287 |
|
|
|
288 |
|
|
|
289 |
|
|
|
290 |
|
|
|
291 |
|
|
|
292 |
|
|
|
293 |
|
|
|
294 |
|
|
|
295 |
|
|
|
296 |
|
|
|
297 |
|
|
|
298 |
|
|
|
299 |
|
|
|
300 |
|
|
|
301 |
|
|
|
302 |
|
|
|
303 |
|
|
|
304 |
|
|
|
305 |
|
|
|
306 |
|
|
|
307 |
|
|
|
308 |
|
|
|
309 |
|
|
|
310 |
|
|
|
311 |
|
|
|
312 |
|
|
|
313 |
|
|
|
314 |
|
|
|
315 |
|
|
|
316 |
|
|
|
317 |
|
|
|
318 |
|
|
|
319 |
|
|
|
320 |
|
|
|
321 |
|
|
|
322 |
|
|
|
323 |
|
|
|
324 |
|
|
|
325 |
|
|
|
326 |
|
|
|
327 |
|
|
|
328 |
|
|
|
329 |
|
|
|
330 |
|
|
|
331 |
|
|
|
332 |
|
|
|
333 |
|
|
|
334 |
|
|
|
335 |
|
|
|
336 |
|
|
|
337 |
|
|
|
338 |
|
|
|
339 |
|
|
|
340 |
|
|
|
341 |
|
|
|
342 |
|
|
|
343 |
|
|
|
344 |
|
|
|
345 |
|
|
|
346 |
|
|
|
347 |
|
|
|
348 |
|
|
|
349 |
|
|
|
350 |
|
|
|
351 |
|
|
|
352 |
|
|
|
353 |
|
|
|
354 |
|
|
|
355 |
|
|
|
356 |
|
|
|
357 |
|
|
|
358 |
|
|
|
359 |
|
|
|
360 |
|
|
|
361 |
|
|
|
362 |
|
|
|
363 |
|
|
|
364 |
|
|
|
365 |
|
|
|
366 |
|
|
|
367 |
|
|
|
368 |
|
|
|
369 |
|
|
|
370 |
|
|
|
371 |
|
|
|
372 |
|
|
|
373 |
|
|
|
374 |
|
|
|
375 |
|
|
|
376 |
|
|
|
377 |
|
|
|
378 |
|
|
|
379 |
|
|
|
380 |
|
|
|
381 |
|
|
|
382 |
|
|
|
383 |
|
|
|
384 |
|
|
|
385 |
|
|
|
386 |
|
|
|
387 |
|
|
|
388 |
|
|
|
389 |
|
|
|
390 |
|
|
|
391 |
|
|
|
392 |
|
|
|
393 |
|
|
|
394 |
|
|
|
395 |
|
|
|
396 |
|
|
|
397 |
|
|
|
398 |
|
|
|
399 |
|
|
|
400 |
|
|
|
401 |
|
|
|
402 |
|
|
|
403 |
|
|
|
404 |
|
|
|
405 |
|
|
|
406 |
|
|
|
407 |
|
|
|
408 |
|
|
|
409 |
|
|
|
410 |
|
|
|
411 |
|
|
|
412 |
|
|
|
413 |
|
|
|
414 |
|
|
|
415 |
|
|
|
416 |
|
|
|
417 |
|
|
|
418 |
|