回复：Re: some question about arch/x86/kernel/head_64.S

[Mike Krinkin]

On Wed, Dec 30, 2015 at 08:04:19PM +0800, hitmoon wrote:
> Thank you mike!
> so ，after the first instruction ，rbp contains the offset of actually loaded
> address, which equals the physical address.

yes, comment above says that at that point "someone has loaded an identity
mapped page table", so it should be equal to the physical address.

> $_text - __START_KERNEL_map contains the expected physical address .
> Right ?

yes, as far as i can tell.