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powerpc/mm/32s: add setibat() clearibat() and update_bats()

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setibat() and clearibat() allows to manipulate IBATs independently
of DBATs.

update_bats() allows to update bats after init. This is done
with MMU off.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-02-21 19:08:48 +00:00
committed by Michael Ellerman
parent 166d97d961
commit 5e04ae85fb
3 changed files with 69 additions and 0 deletions
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35
arch/powerpc/kernel/head_32.S
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@@ -1096,6 +1096,41 @@ BEGIN_MMU_FTR_SECTION
END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
blr
_ENTRY(update_bats)
lis r4, 1f@h
ori r4, r4, 1f@l
tophys(r4, r4)
mfmsr r6
mflr r7
li r3, MSR_KERNEL & ~(MSR_IR | MSR_DR)
rlwinm r0, r6, 0, ~MSR_RI
rlwinm r0, r0, 0, ~MSR_EE
mtmsr r0
mtspr SPRN_SRR0, r4
mtspr SPRN_SRR1, r3
SYNC
RFI
1: bl clear_bats
lis r3, BATS@ha
addi r3, r3, BATS@l
tophys(r3, r3)
LOAD_BAT(0, r3, r4, r5)
LOAD_BAT(1, r3, r4, r5)
LOAD_BAT(2, r3, r4, r5)
LOAD_BAT(3, r3, r4, r5)
BEGIN_MMU_FTR_SECTION
LOAD_BAT(4, r3, r4, r5)
LOAD_BAT(5, r3, r4, r5)
LOAD_BAT(6, r3, r4, r5)
LOAD_BAT(7, r3, r4, r5)
END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS)
li r3, MSR_KERNEL & ~(MSR_IR | MSR_DR | MSR_RI)
mtmsr r3
mtspr SPRN_SRR0, r7
mtspr SPRN_SRR1, r6
SYNC
RFI
flush_tlbs:
lis r10, 0x40
1: addic. r10, r10, -0x1000