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dcache: Loads from non-cacheable PTEs load entire 64 bits

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A non-cacheable load should only load the data requested and no more. We
do the right thing for real mode cache inhibited storage instructions,
but when loading through a non-cacheable PTE we load the entire 64 bits
regardless of the size.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
This commit is contained in:
Anton Blanchard
2021-09-10 20:51:53 +10:00
committed by Anton Blanchard
parent 09bd01a49e
commit b29c58f3d1
1 changed files with 1 additions and 1 deletions
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dcache.vhdl
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@@ -1363,7 +1363,7 @@ begin
req.data := d_in.data;
end if;
-- Select all bytes for dcbz and for cacheable loads
if r0.req.dcbz = '1' or (r0.req.load = '1' and r0.req.nc = '0') then
if r0.req.dcbz = '1' or (r0.req.load = '1' and r0.req.nc = '0' and perm_attr.nocache = '0') then
req.byte_sel := (others => '1');
else
req.byte_sel := r0.req.byte_sel;