On 2014/05/21 09:40:45, danno wrote:
Thanks for the heads-up, Rodolph. So, should arm64 work exactly like x64?
i.e.
use a 46 bit hint? Chris, where did you get the 48/38 bit constraint?
I should have been more accurate. The architecture support 48 bits
addresses,
but how many bits is available will depend on the kernel config: with 4k
pages
and 3 level of page table then you "only" have 40 bits of addresses, which
is
probably where the initial number comes from. The kernel can be configured
to
have a wider range of addresses using more page table levels or using 64k
pages.
I guess going for the lowest denominator is the right thing to do. Updating
the
comment would be good though.
https://codereview.chromium.org/296853005/
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