> On 25 Oct 2016, at 18:27, David Miller <davem@xxxxxxxxxxxxx> wrote:
>
> From: David Miller <davem@xxxxxxxxxxxxx>
> Date: Tue, 25 Oct 2016 13:18:08 -0400 (EDT)
>
>> 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.
>
> Ok, this should work:
>
> static void flush_tsb_kernel_range_scan(unsigned long start, unsigned long end)
> {
> unsigned long idx;
>
> for (idx = 0; idx < KERNEL_TSB_NENTRIES; idx++) {
> struct tsb *ent = &swapper_tsb[idx];
> unsigned long match = idx << 13;
>
> match |= (ent->tag << 22);
> if (match >= start && match < end)
> ent->tag = (1UL << TSB_TAG_INVALID_BIT);
> }
> }
>
> Bits 13-"21+N" come from the TSB index, and the tag always stores
> bits 22 and above. So simply 'or'ing them together always gives
> us a usable match value.
Ah, right, got it. That makes it much nicer than mine.
James
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