Questions about page table implementation

My questions relate to the linux page table implementation, which I
am
perusing at the moment.

Firstly, I am confused about the definition of a 'page frame' - does
it mean a 4Kb page or another concept? What is a page frame number?
How did they come up with the size of a page as 4Kb?


How does the memory manager know during initial boot up, what
physical
memory is available? And how does this relate to the "e820 map"?
Please tell me what the e820 map is about.


Tilak

.

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