On Wed, Jun 1, 2011 at 13:34, sandeep kumar <coolsandyforyou@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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