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| author | Guo Ren <ren_guo@c-sky.com> | 2018-09-05 08:25:12 +0200 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2018-10-25 17:36:19 +0200 |
| commit | 013de2d6671d89de3397904749c86a69ac0686f7 (patch) | |
| tree | a957e4719ccb7f7383bfa17f8937d61409ee9119 /arch/csky/include/asm/segment.h | |
| parent | csky: Cache and TLB routines (diff) | |
| download | linux-013de2d6671d89de3397904749c86a69ac0686f7.tar.xz linux-013de2d6671d89de3397904749c86a69ac0686f7.zip | |
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>
Diffstat (limited to 'arch/csky/include/asm/segment.h')
| -rw-r--r-- | arch/csky/include/asm/segment.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/csky/include/asm/segment.h b/arch/csky/include/asm/segment.h new file mode 100644 index 000000000000..ffdc4c47ff43 --- /dev/null +++ b/arch/csky/include/asm/segment.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_SEGMENT_H +#define __ASM_CSKY_SEGMENT_H + +typedef struct { + unsigned long seg; +} mm_segment_t; + +#define KERNEL_DS ((mm_segment_t) { 0xFFFFFFFF }) +#define get_ds() KERNEL_DS + +#define USER_DS ((mm_segment_t) { 0x80000000UL }) +#define get_fs() (current_thread_info()->addr_limit) +#define set_fs(x) (current_thread_info()->addr_limit = (x)) +#define segment_eq(a, b) ((a).seg == (b).seg) + +#endif /* __ASM_CSKY_SEGMENT_H */ |