Messages in this thread | | | Subject | Re: [i386] Questions regarding provisional page tables initialization | From | Andi Kleen <> | Date | 02 Jul 2007 12:43:15 +0200 |
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"Ahmed S. Darwish" <darwish.07@gmail.com> writes: > > There're some stuff that confused me for a full day about the code (head.S) > that accomplishes the above words: > > movl $(pg0 - __PAGE_OFFSET), %edi > movl $(swapper_pg_dir - __PAGE_OFFSET), %edx > movl $0x007, %eax /* 0x007 = PRESENT+RW+USER */ > 10: > leal $0x007(%edi),%ecx /* Create PDE entry */ > > What does the address of 7 bytes displacement after %edi - the physical address > of pg0 - represent ?.
The trick is not to know everything, but to know where to look ...
Page table entries use the first 12 bits for various flags. Take a look at the Intel or AMD x86 documentation from their websites.
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