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| 463 | and, finally, the leaf level is called PTL3. All architectures using |
463 | and, finally, the leaf level is called PTL3. All architectures using |
| 464 | this mechanism are required to use PTL0 and PTL3. However, the middle |
464 | this mechanism are required to use PTL0 and PTL3. However, the middle |
| 465 | levels can be left out, depending on the hardware hierachy or |
465 | levels can be left out, depending on the hardware hierachy or |
| 466 | structure of software-only page tables. The genericity is achieved |
466 | structure of software-only page tables. The genericity is achieved |
| 467 | through a set of macros that define transitions from one level to |
467 | through a set of macros that define transitions from one level to |
| 468 | another. Unused levels are optimised out by the compiler.</para> |
468 | another. Unused levels are optimised out by the compiler. |
| - | 469 | <figure float="1"> |
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| - | 470 | <mediaobject id="mm_pt"> |
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| - | 471 | <imageobject role="pdf"> |
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| - | 472 | <imagedata fileref="images/mm_pt.pdf" format="PDF" /> |
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| - | 473 | </imageobject> |
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| - | 474 | ||
| - | 475 | <imageobject role="html"> |
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| - | 476 | <imagedata fileref="images/mm_pt.png" format="PNG" /> |
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| - | 477 | </imageobject> |
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| - | 478 | ||
| - | 479 | <imageobject role="fop"> |
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| - | 480 | <imagedata fileref="images/mm_pt.svg" format="SVG" /> |
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| - | 481 | </imageobject> |
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| - | 482 | </mediaobject> |
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| - | 483 | ||
| - | 484 | <title>Hierarchical 4-level page tables.</title> |
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| - | 485 | </figure> |
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| - | 486 | </para> |
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| 469 | </section> |
487 | </section> |
| 470 | 488 | ||
| 471 | <section> |
489 | <section> |
| 472 | <indexterm> |
490 | <indexterm> |
| 473 | <primary>page tables</primary> |
491 | <primary>page tables</primary> |
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| 486 | key for the hash table. One of the major differences between the |
504 | key for the hash table. One of the major differences between the |
| 487 | global page hash table and hierarchical 4-level page tables is that |
505 | global page hash table and hierarchical 4-level page tables is that |
| 488 | there is only a single global page hash table in the system while |
506 | there is only a single global page hash table in the system while |
| 489 | hierarchical page tables exist per address space. Thus, the global |
507 | hierarchical page tables exist per address space. Thus, the global |
| 490 | page hash table contains information about mappings of all address |
508 | page hash table contains information about mappings of all address |
| 491 | spaces in the system.</para> |
509 | spaces in the system. |
| - | 510 | <figure float="1"> |
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| - | 511 | <mediaobject id="mm_hash"> |
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| - | 512 | <imageobject role="pdf"> |
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| - | 513 | <imagedata fileref="images/mm_hash.pdf" format="PDF" /> |
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| - | 514 | </imageobject> |
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| - | 515 | ||
| - | 516 | <imageobject role="html"> |
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| - | 517 | <imagedata fileref="images/mm_hash.png" format="PNG" /> |
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| - | 518 | </imageobject> |
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| - | 519 | ||
| - | 520 | <imageobject role="fop"> |
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| - | 521 | <imagedata fileref="images/mm_hash.svg" format="SVG" /> |
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| - | 522 | </imageobject> |
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| - | 523 | </mediaobject> |
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| - | 524 | ||
| - | 525 | <title>Global page hash table.</title> |
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| - | 526 | </figure> |
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| - | 527 | </para> |
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| 492 | 528 | ||
| 493 | <para>The global page hash table mechanism uses the generic hash table |
529 | <para>The global page hash table mechanism uses the generic hash table |
| 494 | type as described in the chapter dedicated to <link |
530 | type as described in the chapter dedicated to <link |
| 495 | linkend="hashtables">data structures</link> earlier in this |
531 | linkend="hashtables">data structures</link> earlier in this |
| 496 | book.</para> |
532 | book.</para> |