Clarification on memory mapping

[Mulyadi Santosa]

On Wed, Jun 1, 2011 at 13:34, sandeep kumar <coolsandyforyou at gmail.com> wrote:
> Hi,
> I am new to kernel programming. Last few days i have been reading about
> memory management, memory mapping etc.,
> But i could not put the things together.
> Here i need clarifications regarding the few things whether wat i understood
> is right or not.
>
> 1) Mapping means bringing a device memory which is not in the address space
> of kernel/user to its address space.
>
> ioremap() :
> 2) ioremap does mapping of a particular i/o device to kernel logical memory
> address.
>
> mmap()
> 3) mmap does the mapping of a device memory to user space virtual address.

it maps either a file or you do anonymous page allocation here. I
doubt it deals with device....at least directly....


> kmap()
> 4) gets a kernel virtual address of an allocated high memory page.
>
> 5) And finally memory mapping does a manipulation of a PTE.
>
> Tell if i have interpreted anything wrong and please correct me.
>
> Thank you
>
>
>
> --
> With regards,
> Sandeep Kumar Anantapalli,
>
>
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>



-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

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