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>
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index 17d37ed..017f4fc 100644
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -3,6 +3,7 @@
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 @@
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