From 5e04ae85fbed8eef209a40a63f8ef507fe623064 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Thu, 21 Feb 2019 19:08:48 +0000 Subject: powerpc/mm/32s: add setibat() clearibat() and update_bats() 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 Signed-off-by: Michael Ellerman --- arch/powerpc/kernel/head_32.S | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'arch/powerpc/kernel/head_32.S') diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index fdb587c96a80..613900bb8c39 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -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 -- cgit