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authorGreg Ungerer <gerg@uclinux.org>2011-11-11 15:13:08 +1000
committerGreg Ungerer <gerg@uclinux.org>2011-12-24 21:47:57 +1000
commit84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4 (patch)
treea1d64dd3c6da8726cb74bb206d4da15228cfdae2 /arch/m68k/Kconfig.cpu
parent7f73bafc4630a450ebe8b021efa14781ffd992b1 (diff)
downloadop-kernel-dev-84f3fb7a2aadeda3c0a34e61591a8eccf5e367b4.zip
op-kernel-dev-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.cpu')
-rw-r--r--arch/m68k/Kconfig.cpu2
1 files changed, 2 insertions, 0 deletions
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 @@ 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
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