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| author | Guo Ren | 2019-04-08 05:12:25 +0200 |
|---|---|---|
| committer | Guo Ren | 2019-04-22 07:44:57 +0200 |
| commit | f62e31623d718a7c20d9da98de48361624d7360a (patch) | |
| tree | 686ee8d9ea793443c6ad184f36074c2e391c535c /arch/csky/abiv2/inc/abi/entry.h | |
| parent | csky: Reconstruct signal processing (diff) | |
| download | kernel-qcow2-linux-f62e31623d718a7c20d9da98de48361624d7360a.tar.gz kernel-qcow2-linux-f62e31623d718a7c20d9da98de48361624d7360a.tar.xz kernel-qcow2-linux-f62e31623d718a7c20d9da98de48361624d7360a.zip | |
csky: Support dynamic start physical address
Before this patch csky-linux need CONFIG_RAM_BASE to determine start
physical address. Now we use phys_offset variable to replace the macro
of PHYS_OFFSET and we setup phys_offset with real physical address which
is determined during startup in head.S.
With this patch we needn't re-compile kernel for different start
physical address. ie: 0x0 / 0xc0000000 start physical address could use
the same vmlinux, be care different start address must be 512MB aligned.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/abiv2/inc/abi/entry.h')
| -rw-r--r-- | arch/csky/abiv2/inc/abi/entry.h | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index 6a0df655182c..c0a76c43cded 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/arch/csky/abiv2/inc/abi/entry.h @@ -163,9 +163,29 @@ .endm .macro SETUP_MMU rx - lrw \rx, PHYS_OFFSET | 0xe + /* Check MMU on | off */ + mfcr \rx, cr18 + btsti \rx, 0 + bt 1f + grs \rx, 1f + br 2f +1: + /* + * cr<30, 15> format: + * 31 - 29 | 28 - 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 + * BA Reserved SH WA B SO SEC C D V + */ + mfcr \rx, cr<30, 15> +2: + lsri \rx, 28 + lsli \rx, 28 + addi \rx, 0x1ce mtcr \rx, cr<30, 15> - lrw \rx, (PHYS_OFFSET + 0x20000000) | 0xe + + lsri \rx, 28 + addi \rx, 2 + lsli \rx, 28 + addi \rx, 0x1ce mtcr \rx, cr<31, 15> .endm |