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m68k: handle presence of 64bit mul/div instructions cleanly

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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>
This commit is contained in:
Greg Ungerer
2011-11-11 15:13:08 +10:00
parent 7f73bafc46
commit 84f3fb7a2a
5 changed files with 13 additions and 10 deletions
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8
arch/m68k/include/asm/div64.h
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@@ -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 */