diff options
| 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 | |
| parent | 7f73bafc4630a450ebe8b021efa14781ffd992b1 (diff) | |
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')
| -rw-r--r-- | arch/m68k/Kconfig | 3 | ||||
| -rw-r--r-- | arch/m68k/Kconfig.cpu | 2 | ||||
| -rw-r--r-- | arch/m68k/include/asm/div64.h | 8 | ||||
| -rw-r--r-- | arch/m68k/kernel/m68k_ksyms.c | 2 | ||||
| -rw-r--r-- | arch/m68k/lib/Makefile | 8 |
5 files changed, 13 insertions, 10 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 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 diff --git a/arch/m68k/include/asm/div64.h b/arch/m68k/include/asm/div64.h index edb66148a71d..444ea8a09e9f 100644 --- a/arch/m68k/include/asm/div64.h +++ b/arch/m68k/include/asm/div64.h @@ -1,7 +1,9 @@ #ifndef _M68K_DIV64_H #define _M68K_DIV64_H -#ifdef CONFIG_MMU +#ifdef CONFIG_CPU_HAS_NO_MULDIV64 +#include <asm-generic/div64.h> +#else #include <linux/types.h> @@ -27,8 +29,6 @@ __rem; \ }) -#else -#include <asm-generic/div64.h> -#endif /* CONFIG_MMU */ +#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */ #endif /* _M68K_DIV64_H */ diff --git a/arch/m68k/kernel/m68k_ksyms.c b/arch/m68k/kernel/m68k_ksyms.c index 1b7a14d1a000..774c1bd59c36 100644 --- a/arch/m68k/kernel/m68k_ksyms.c +++ b/arch/m68k/kernel/m68k_ksyms.c @@ -14,7 +14,7 @@ EXPORT_SYMBOL(__ashrdi3); EXPORT_SYMBOL(__lshrdi3); EXPORT_SYMBOL(__muldi3); -#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE) +#if defined(CONFIG_CPU_HAS_NO_MULDIV64) /* * Simpler 68k and ColdFire parts also need a few other gcc functions. */ diff --git a/arch/m68k/lib/Makefile b/arch/m68k/lib/Makefile index b3b40e4ed339..a9d782d34276 100644 --- a/arch/m68k/lib/Makefile +++ b/arch/m68k/lib/Makefile @@ -6,11 +6,9 @@ lib-y := ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \ memcpy.o memset.o memmove.o -ifdef CONFIG_MMU -lib-y += string.o uaccess.o -else -lib-y += mulsi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o -endif +lib-$(CONFIG_MMU) += string.o uaccess.o +lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += mulsi3.o divsi3.o udivsi3.o +lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += modsi3.o umodsi3.o ifndef CONFIG_GENERIC_CSUM lib-y += checksum.o |