kernel/arch/csky/include/asm/addrspace.h at c55b51a06b01d67a99457bb82a8c31081c7faa23 - nagai/kernel - Nagai Git

nagai/kernel

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Guo Ren 013de2d667 csky: MMU and page table management

This patch adds files related to memory management and here is our
memory-layout:

   Fixmap       : 0xffc02000 – 0xfffff000       (4 MB - 12KB)
   Pkmap        : 0xff800000 – 0xffc00000       (4 MB)
   Vmalloc      : 0xf0200000 – 0xff000000       (238 MB)
   Lowmem       : 0x80000000 – 0xc0000000       (1GB)

abiv1 CPU (CK610) is VIPT cache and it doesn't support highmem.
abiv2 CPUs are all PIPT cache and they could support highmem.

Lowmem is directly mapped by msa0 & msa1 reg, and we needn't setup
memory page table for it.

Link:https://lore.kernel.org/lkml/20180518215548.GH17671@n2100.armlinux.org.uk/
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>

2018-10-25 23:36:19 +08:00

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 /* SPDX-License-Identifier: GPL-2.0 */
 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
 #ifndef __ASM_CSKY_ADDRSPACE_H
 #define __ASM_CSKY_ADDRSPACE_H
 #define KSEG0		0x80000000ul
 #define KSEG0ADDR(a)	(((unsigned long)a & 0x1fffffff) | KSEG0)
 #endif /* __ASM_CSKY_ADDRSPACE_H */