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| author | Greg Ungerer <gerg@uclinux.org> | 2011-11-11 06:13:08 +0100 |
|---|---|---|
| committer | Greg Ungerer <gerg@uclinux.org> | 2011-12-24 12:47:57 +0100 |
| commit | 84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4 (patch) | |
| tree | a1d64dd3c6da8726cb74bb206d4da15228cfdae2 /arch/m68k/Kconfig.cpu | |
| parent | m68k: simpler m68k and ColdFire CPU's can use generic csum code (diff) | |
| download | linux-84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4.tar.xz linux-84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4.zip | |
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.cpu')
| -rw-r--r-- | arch/m68k/Kconfig.cpu | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu index 17d37ed57f3c..017f4fc388d2 100644 --- a/arch/m68k/Kconfig.cpu +++ b/arch/m68k/Kconfig.cpu @@ -3,6 +3,7 @@ comment "Processor Type" config M68000 bool select CPU_HAS_NO_BITFIELDS + select CPU_HAS_NO_MULDIV64 select GENERIC_CSUM help The Freescale (was Motorola) 68000 CPU is the first generation of @@ -24,6 +25,7 @@ config COLDFIRE select GENERIC_GPIO select ARCH_REQUIRE_GPIOLIB select CPU_HAS_NO_BITFIELDS + select CPU_HAS_NO_MULDIV64 select GENERIC_CSUM help The Freescale ColdFire family of processors is a modern derivitive |