Re: [i386] Questions regarding provisional page tables initialization

[Andreas Schwab]

"Ahmed S. Darwish" <darwish.07@xxxxxxxxx> writes:

>         page_pde_offset = (__PAGE_OFFSET >> 20)
> 	movl %ecx,(%edx)			/* Store identity PDE entry */
> 	movl %ecx,page_pde_offset(%edx)		/* Store kernel PDE entry */
>
> Why the pde_offset is PAGE_OFFSET >> 20 instead of PAGE_OFFSET >> 22 ?
> * 22 to right shift the whole page_shift (12) and pgdir_shift (10) bits.

4 is the element size.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@xxxxxxx
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/