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| author | Greg Ungerer <gerg@uclinux.org> | 2011-11-11 15:13:08 +1000 |
|---|---|---|
| committer | Greg Ungerer <gerg@uclinux.org> | 2011-12-24 21:47:57 +1000 |
| commit | 84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4 (patch) | |
| tree | a1d64dd3c6da8726cb74bb206d4da15228cfdae2 /arch/m68k/Kconfig | |
| parent | 7f73bafc4630a450ebe8b021efa14781ffd992b1 (diff) | |
| download | linux-84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4.tar.gz | |
m68k: handle presence of 64bit mul/div instructions cleanly
The traditional 68000 processors and the newer reduced instruction set ColdFire processors do not support the 32*32->64 multiply or the 64/32->32 divide instructions. This is not a difference based on the presence of a hardware MMU or not. Create a new config symbol to mark that a CPU type doesn't support the longer multiply/divide instructions. Use this then as a basis for using the fast 64bit based divide (in div64.h) and for linking in the extra libgcc functions that may be required (mulsi3, divsi3, etc). Signed-off-by: Greg Ungerer <gerg@uclinux.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/Kconfig')
| -rw-r--r-- | arch/m68k/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 2fe2d633fe08..32fd3642e71b 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -63,6 +63,9 @@ config ZONE_DMA config CPU_HAS_NO_BITFIELDS bool +config CPU_HAS_NO_MULDIV64 + bool + config HZ int default 1000 if CLEOPATRA |