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.
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