nds32: Fill all TLB entries with kernel image mapping
We use earlycon replace with early_printk and doesn't use
early_io_map() to create UART mapping. It is not necessary
to reserve the one way in TLB for now.
It didn't make sense if use direct-mapped and reserve one
way at the same time. It allow the direct-mapped now.
Signed-off-by: Zong Li <zong@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
diff --git a/arch/nds32/kernel/head.S b/arch/nds32/kernel/head.S
index 1ce653d..2c8aac6 100644
--- a/arch/nds32/kernel/head.S
+++ b/arch/nds32/kernel/head.S
@@ -123,14 +123,7 @@
andi $r0, $r0, MMU_CFG_mskTBS
srli $r6, $r6, MMU_CFG_offTBW
srli $r0, $r0, MMU_CFG_offTBS
- /*
- * we just map the kernel to the maximum way - 1 of tlb
- * reserver one way for UART VA mapping
- * it will cause page fault if UART mapping cover the kernel mapping
- *
- * direct mapping is not supported now.
- */
- beqz $r6, __error ! MMU_CFG.TBW = 0 is direct mappin
+ addi $r6, $r6, #0x1 ! MMU_CFG.TBW value -> meaning
addi $r0, $r0, #0x2 ! MMU_CFG.TBS value -> meaning
sll $r0, $r6, $r0 ! entries = k-way * n-set
mul $r6, $r0, $r5 ! max size = entries * page size