From: James Clarke <jrtc27@xxxxxxxxxx>
Date: Tue, 25 Oct 2016 18:09:12 +0100
>> On 25 Oct 2016, at 18:04, David Miller <davem@xxxxxxxxxxxxx> wrote:
>>
>> From: James Clarke <jrtc27@xxxxxxxxxx>
>> Date: Tue, 25 Oct 2016 16:59:04 +0100
>>
>>> Thatʼs basically the same as my patch, except this potentially flushes things
>>> outside [start, end) if theyʼre not on 2^22-byte boundaries.
>>
>> Oh yes, I see, thanks for pointing that out.
>>
>> We have to take the index into account for the purposes of virtual
>> address comparison.
>
> I donʼt quite follow what youʼre trying to say here? idx is only used to index the TSB.
It is also how bits "13-21" of the virtual address are matched.
Think about what happens when a TSB entry is looked up.
Since, by virtue being in TSB entry with index X the virtual address
bits 13-21 are implied, they don't need to be stored in the tag.
So the full virtual address comparison is something like:
unsigned long compare = (tag >> 22) << 22; /* Clear CONTEXT bits */
compare |= (tsb_index & (nentries - 1)) << 13;
if (vaddr == compare)
goto match;
The swapper TSB only stores PAGE_SIZE translations.
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