| 36,7 → 36,7 |
|---|
| <para>Virtual memory is usually using paged memory model, where virtual |
| memory address space is divided into the <emphasis>pages</emphasis> |
| (usually having size 4096 bytes) and physical memory is divided into the |
| frames (same sized as a page, of cause). Each page may be mapped to some |
| frames (same sized as a page, of course). Each page may be mapped to some |
| frame and then, upon memory access to the virtual address, CPU performs |
| <emphasis>address translation</emphasis> during the instruction |
| execution. Non-existing mapping generates page fault exception, calling |
| 56,7 → 56,7 |
|---|
| |
| <para>At the moment HelenOS does not support swapping.</para> |
| |
| - pouzivame vypadky stranky k alokaci ramcu on-demand v ramci as_area - na architekturach, ktere to podporuji, podporujeme non-exec stranky |
| <para>- pouzivame vypadky stranky k alokaci ramcu on-demand v ramci as_area - na architekturach, ktere to podporuji, podporujeme non-exec stranky </para> |
| </section> |
| |
| <section> |
| 65,11 → 65,15 |
|---|
| <section> |
| <title>Address spaces and areas</title> |
| |
| <para>- adresovy prostor se sklada z tzv. address space areas |
| <para> |
| |
| - adresovy prostor se sklada z tzv. address space areas |
| usporadanych v B+stromu; tyto areas popisuji vyuzivane casti |
| adresoveho prostoru patrici do user address space. Kazda cast je dana |
| svoji bazovou adresou, velikosti a flagy (rwx/dd).</para> |
| svoji bazovou adresou, velikosti a flagy (rwx/dd). |
| |
| </para> |
| |
| <para>- uzivatelske thready maji moznost manipulovat se svym adresovym |
| prostorem (vytvaret/resizovat/sdilet) as_areas pomoci syscallu</para> |
| </section> |