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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>
35 lines
760 B
C
35 lines
760 B
C
#ifndef _M68K_DIV64_H
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#define _M68K_DIV64_H
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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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/* n = n / base; return rem; */
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#define do_div(n, base) ({ \
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union { \
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unsigned long n32[2]; \
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unsigned long long n64; \
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} __n; \
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unsigned long __rem, __upper; \
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\
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__n.n64 = (n); \
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if ((__upper = __n.n32[0])) { \
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asm ("divul.l %2,%1:%0" \
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: "=d" (__n.n32[0]), "=d" (__upper) \
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: "d" (base), "0" (__n.n32[0])); \
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} \
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asm ("divu.l %2,%1:%0" \
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: "=d" (__n.n32[1]), "=d" (__rem) \
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: "d" (base), "1" (__upper), "0" (__n.n32[1])); \
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(n) = __n.n64; \
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__rem; \
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})
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#endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
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#endif /* _M68K_DIV64_H */
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