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Subject[PATCH] powerpc/e200: Skip tlb1 entries used for kernel mapping
Date
E200 have TLB1 only and it does not have TLB0.
So TLB1 are used for mapping kernel and user-space both.
TLB miss handler for E200 does not consider skipping TLBs
used for kernel mapping. This patch ensures that we skip
tlb1 entries used for kernel mapping (tlbcam_index).

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
---
arch/powerpc/kernel/head_fsl_booke.S | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index bf4c602..951fb96 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -801,12 +801,28 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
/* Round robin TLB1 entries assignment */
mfspr r12, SPRN_MAS0

+ /* Get first free tlbcam entry */
+ lis r11, tlbcam_index@ha
+ lwz r11, tlbcam_index@l(r11)
+
+ /* Extract MAS0(NV) */
+ andi. r13, r12, 0xfff
+ cmpw 0, r13, r11
+ blt 0, 5f
+ b 6f
+5:
+ /* When NV is less than first free tlbcam entry, use first free
+ * tlbcam entry for ESEL and set NV */
+ rlwimi r12, r11, 16, 4, 15
+ addi r11, r11, 1
+ rlwimi r12, r11, 0, 20, 31
+ b 7f
+6:
/* Extract TLB1CFG(NENTRY) */
mfspr r11, SPRN_TLB1CFG
andi. r11, r11, 0xfff

- /* Extract MAS0(NV) */
- andi. r13, r12, 0xfff
+ /* Set MAS0(NV) for next TLB miss exception */
addi r13, r13, 1
cmpw 0, r13, r11
addi r12, r12, 1
--
1.9.3
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