L4 Mapping question

[Robert Kaiser]

Hi Volkmar

On Mon, 22 Feb 1999 vuhlig at us.ibm.com wrote:

> the 5 mappings are on average (and configurable!). They are not assigned to
> one particular frame.

Well, that does make a difference!

> I used the term frame in the context of available
> physical memory. you need some additional mapping entries for devices (like
> video frame buffer). The kernel must keep track of the mappings, because
> otherwise the pager can not revoke a page from an address space, where the
> page was indirectly mapped to. (e.g. A=pager mapps to B and maps to C, D,
> and E. Hereby, A is only aware of the mapping to B.) But the kernel concept
> allows to map any available/mapped memory from one address space to
> another.
> 

OK, I think I'm beginning to understand now...

Thank you very much this helpful conversation!

Cheers

Rob

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Robert Kaiser                          email: rkaiser at sysgo.de
SYSGO RTS GmbH
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