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Open Source and information security mailing list archives
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Date: 02 Jul 2007 12:43:15 +0200 From: Andi Kleen <andi@...stfloor.org> To: "Ahmed S. Darwish" <darwish.07@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [i386] Questions regarding provisional page tables initialization "Ahmed S. Darwish" <darwish.07@...il.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. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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