m68k: handle presence of 64bit mul/div instructions cleanly
authorGreg Ungerer <gerg@uclinux.org>
Fri, 11 Nov 2011 05:13:08 +0000 (15:13 +1000)
committerGreg Ungerer <gerg@uclinux.org>
Sat, 24 Dec 2011 11:47:57 +0000 (21:47 +1000)
commit84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4
treea1d64dd3c6da8726cb74bb206d4da15228cfdae2
parent7f73bafc4630a450ebe8b021efa14781ffd992b1
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>
arch/m68k/Kconfig
arch/m68k/Kconfig.cpu
arch/m68k/include/asm/div64.h
arch/m68k/kernel/m68k_ksyms.c
arch/m68k/lib/Makefile