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| author | Greg Ungerer <gerg@uclinux.org> | 2011-10-14 15:41:56 +1000 |
|---|---|---|
| committer | Greg Ungerer <gerg@uclinux.org> | 2011-12-30 10:20:24 +1000 |
| commit | bbc6f1ba509cf9cda42ce63bbd40afe577ab028e (patch) | |
| tree | 281010e3d781b995e429efaacd7c99d0947c2bdf /arch/m68k/include | |
| parent | 88be3515934004d271398129ba7145635e95127e (diff) | |
| download | lwn-bbc6f1ba509cf9cda42ce63bbd40afe577ab028e.tar.gz lwn-bbc6f1ba509cf9cda42ce63bbd40afe577ab028e.zip | |
m68k: set register a2 to current if MMU enabled on ColdFire
Virtual memory m68k systems build with register a2 dedicated to being the
current proc pointer (non-MMU don't do this). Add code to the ColdFire
interrupt and exception processing to set this on entry, and at context
switch time. We use the same GET_CURRENT() macro that MMU enabled code
uses - modifying it so that the assembler is ColdFire clean.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Matt Waddel <mwaddel@yahoo.com>
Acked-by: Kurt Mahan <kmahan@xmission.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/include')
| -rw-r--r-- | arch/m68k/include/asm/entry.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/m68k/include/asm/entry.h b/arch/m68k/include/asm/entry.h index c3c5a8643e15..622138dc7288 100644 --- a/arch/m68k/include/asm/entry.h +++ b/arch/m68k/include/asm/entry.h @@ -222,16 +222,24 @@ * Non-MMU systems do not reserve %a2 in this way, and this definition is * not used for them. */ +#ifdef CONFIG_MMU + #define curptr a2 #define GET_CURRENT(tmp) get_current tmp .macro get_current reg=%d0 movel %sp,\reg - andw #-THREAD_SIZE,\reg + andl #-THREAD_SIZE,\reg movel \reg,%curptr movel %curptr@,%curptr .endm +#else + +#define GET_CURRENT(tmp) + +#endif /* CONFIG_MMU */ + #else /* C source */ #define STR(X) STR1(X) |