From 8730c178b4208ec52f4c2b381d9a2b685a791b1c Mon Sep 17 00:00:00 2001 From: Zong Li Date: Wed, 17 Oct 2018 21:15:52 +0800 Subject: 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 Signed-off-by: Greentime Hu --- arch/nds32/kernel/head.S | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) (limited to 'arch/nds32/kernel') diff --git a/arch/nds32/kernel/head.S b/arch/nds32/kernel/head.S index 1ce653d35d93..2c8aac6201be 100644 --- a/arch/nds32/kernel/head.S +++ b/arch/nds32/kernel/head.S @@ -123,14 +123,7 @@ _image_size_check: 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 -- cgit v1.2.3