about create_mapping function

[sandeep kumar]

Hi,
I m trying to understand how different io memory is mapped to the CPU.

While analysing that i was struck at create_mapping function.

i have several questions like,
1) Why map_desc.virtual is filled with physical address of the io device.
2) What is a section and why it is needed?
3) I am not understanding "alloc_init_section(pgd, addr, next, phys, type);"
what it does?



-- 
With regards,
Sandeep Kumar Anantapalli,
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