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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>
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@ -63,6 +63,9 @@ config ZONE_DMA
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config CPU_HAS_NO_BITFIELDS
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bool
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config CPU_HAS_NO_MULDIV64
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bool
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config HZ
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int
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default 1000 if CLEOPATRA
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@ -3,6 +3,7 @@ comment "Processor Type"
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config M68000
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bool
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select CPU_HAS_NO_BITFIELDS
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select CPU_HAS_NO_MULDIV64
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select GENERIC_CSUM
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help
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The Freescale (was Motorola) 68000 CPU is the first generation of
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@ -24,6 +25,7 @@ config COLDFIRE
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select GENERIC_GPIO
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select ARCH_REQUIRE_GPIOLIB
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select CPU_HAS_NO_BITFIELDS
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select CPU_HAS_NO_MULDIV64
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select GENERIC_CSUM
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help
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The Freescale ColdFire family of processors is a modern derivitive
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@ -1,7 +1,9 @@
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#ifndef _M68K_DIV64_H
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#define _M68K_DIV64_H
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#ifdef CONFIG_MMU
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#ifdef CONFIG_CPU_HAS_NO_MULDIV64
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#include <asm-generic/div64.h>
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#else
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#include <linux/types.h>
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@ -27,8 +29,6 @@
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__rem; \
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})
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#else
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#include <asm-generic/div64.h>
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#endif /* CONFIG_MMU */
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#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
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#endif /* _M68K_DIV64_H */
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@ -14,7 +14,7 @@ EXPORT_SYMBOL(__ashrdi3);
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EXPORT_SYMBOL(__lshrdi3);
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EXPORT_SYMBOL(__muldi3);
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#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
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#if defined(CONFIG_CPU_HAS_NO_MULDIV64)
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/*
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* Simpler 68k and ColdFire parts also need a few other gcc functions.
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*/
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@ -6,11 +6,9 @@
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lib-y := ashldi3.o ashrdi3.o lshrdi3.o muldi3.o \
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memcpy.o memset.o memmove.o
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ifdef CONFIG_MMU
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lib-y += string.o uaccess.o
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else
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lib-y += mulsi3.o divsi3.o udivsi3.o modsi3.o umodsi3.o
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endif
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lib-$(CONFIG_MMU) += string.o uaccess.o
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lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += mulsi3.o divsi3.o udivsi3.o
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lib-$(CONFIG_CPU_HAS_NO_MULDIV64) += modsi3.o umodsi3.o
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ifndef CONFIG_GENERIC_CSUM
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lib-y += checksum.o
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