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powerpc/603: Don't handle _PAGE_RW and _PAGE_DIRTY on ITLB misses 

_PAGE_RW and _PAGE_DIRTY do not matter for ITLB misses.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
hifive-unleashed-5.1
Christophe Leroy 2019-02-21 10:37:59 +00:00 committed by Michael Ellerman
parent a8a121995b
commit 54a05a30c8
1 changed files with 2 additions and 6 deletions
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8
arch/powerpc/kernel/head_32.S
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@ -526,13 +526,9 @@ InstructionTLBMiss:
*/
stw r0,0(r2) /* update PTE (accessed bit) */
/* Convert linux-style PTE to low word of PPC-style PTE */
rlwinm r1,r0,32-10,31,31 /* _PAGE_RW -> PP lsb */
rlwinm r2,r0,32-7,31,31 /* _PAGE_DIRTY -> PP lsb */
and r1,r1,r2 /* writable if _RW and _DIRTY */
rlwimi r0,r0,32-1,30,30 /* _PAGE_USER -> PP msb */
rlwimi r0,r0,32-1,31,31 /* _PAGE_USER -> PP lsb */
ori r1,r1,0xe04 /* clear out reserved bits */
andc r1,r0,r1 /* PP = user? (rw&dirty? 2: 3): 0 */
ori r1, r1, 0xe05 /* clear out reserved bits */
andc r1, r0, r1 /* PP = user? 2 : 0 */
BEGIN_FTR_SECTION
rlwinm r1,r1,0,~_PAGE_COHERENT /* clear M (coherence not required) */
END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)