Guo Ren 0c8a32eed1 csky: Add memory layout 2.5G(user):1.5G(kernel)
There are two ways for translating va to pa for csky:
 - Use TLB(Translate Lookup Buffer) and PTW (Page Table Walk)
 - Use SSEG0/1 (Simple Segment Mapping)

We use tlb mapping 0-2G and 3G-4G virtual address area and SSEG0/1
are for 2G-2.5G and 2.5G-3G translation. We could disable SSEG0
to use 2G-2.5G as TLB user mapping.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
2021-01-12 09:52:40 +08:00
..
2019-07-19 14:21:36 +08:00
2019-11-12 11:37:52 +01:00
2020-02-21 15:43:24 +08:00