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| author | Zong Li <zongbox@gmail.com> | 2018-10-17 21:15:52 +0800 |
|---|---|---|
| committer | Greentime Hu <greentime@andestech.com> | 2018-11-06 18:01:39 +0800 |
| commit | 8730c178b4208ec52f4c2b381d9a2b685a791b1c (patch) | |
| tree | 1b871497ab5afd1002c75b93b3669d3eb38ec42a /arch/nds32 | |
| parent | 2e95c4d672ce6c931951c87b5dbfa4106fd3cae6 (diff) | |
| download | linux-0-day-8730c178b4208ec52f4c2b381d9a2b685a791b1c.tar.gz linux-0-day-8730c178b4208ec52f4c2b381d9a2b685a791b1c.tar.xz | |
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>
Diffstat (limited to 'arch/nds32')
| -rw-r--r-- | arch/nds32/kernel/head.S | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/nds32/kernel/head.S b/arch/nds32/kernel/head.S index 1ce653d35d936..2c8aac6201be4 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 |