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6f6d6a1a6a
Rename div64_64 to div64_u64 to make it consistent with the other divide functions, so it clearly includes the type of the divide. Move its definition to math64.h as currently no architecture overrides the generic implementation. They can still override it of course, but the duplicated declarations are avoided. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Cc: Avi Kivity <avi@qumranet.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Howells <dhowells@redhat.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
#ifndef _ASM_GENERIC_DIV64_H
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#define _ASM_GENERIC_DIV64_H
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/*
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* Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
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* Based on former asm-ppc/div64.h and asm-m68knommu/div64.h
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*
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* The semantics of do_div() are:
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*
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* uint32_t do_div(uint64_t *n, uint32_t base)
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* {
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* uint32_t remainder = *n % base;
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* *n = *n / base;
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* return remainder;
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* }
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*
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* NOTE: macro parameter n is evaluated multiple times,
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* beware of side effects!
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*/
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#include <linux/types.h>
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#include <linux/compiler.h>
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#if BITS_PER_LONG == 64
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# define do_div(n,base) ({ \
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uint32_t __base = (base); \
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uint32_t __rem; \
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__rem = ((uint64_t)(n)) % __base; \
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(n) = ((uint64_t)(n)) / __base; \
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__rem; \
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})
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#elif BITS_PER_LONG == 32
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extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
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/* The unnecessary pointer compare is there
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* to check for type safety (n must be 64bit)
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*/
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# define do_div(n,base) ({ \
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uint32_t __base = (base); \
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uint32_t __rem; \
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(void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
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if (likely(((n) >> 32) == 0)) { \
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__rem = (uint32_t)(n) % __base; \
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(n) = (uint32_t)(n) / __base; \
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} else \
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__rem = __div64_32(&(n), __base); \
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__rem; \
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})
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#else /* BITS_PER_LONG == ?? */
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# error do_div() does not yet support the C64
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#endif /* BITS_PER_LONG */
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#endif /* _ASM_GENERIC_DIV64_H */
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