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| author | Nobuhiro Iwamatsu <iwamatsu@nigauri.org> | 2007-09-23 01:29:43 +0900 |
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| committer | Nobuhiro Iwamatsu <iwamatsu@nigauri.org> | 2007-09-23 01:29:43 +0900 |
| commit | b8685affe614ccf5f4ec66252b30e2e524d18948 (patch) | |
| tree | 05bc55b8a4a0451e6500f1f52651d81c0f48f012 /include/div64.h | |
| parent | 69df3c4da0c93017cceb25a366e794570bd0ed98 (diff) | |
| parent | 66dcad3a9a53e0766d90e0084123bd8529522fb0 (diff) | |
| download | u-boot-imx-b8685affe614ccf5f4ec66252b30e2e524d18948.zip u-boot-imx-b8685affe614ccf5f4ec66252b30e2e524d18948.tar.gz u-boot-imx-b8685affe614ccf5f4ec66252b30e2e524d18948.tar.bz2 | |
Merge git://www.denx.de/git/u-boot
Conflicts:
CREDITS
Diffstat (limited to 'include/div64.h')
| -rw-r--r-- | include/div64.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/include/div64.h b/include/div64.h new file mode 100644 index 0000000..2e0ba83 --- /dev/null +++ b/include/div64.h @@ -0,0 +1,39 @@ +#ifndef _ASM_GENERIC_DIV64_H +#define _ASM_GENERIC_DIV64_H +/* + * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com> + * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h + * + * The semantics of do_div() are: + * + * uint32_t do_div(uint64_t *n, uint32_t base) + * { + * uint32_t remainder = *n % base; + * *n = *n / base; + * return remainder; + * } + * + * NOTE: macro parameter n is evaluated multiple times, + * beware of side effects! + */ + +#include <linux/types.h> + +extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor); + +/* The unnecessary pointer compare is there + * to check for type safety (n must be 64bit) + */ +# define do_div(n,base) ({ \ + uint32_t __base = (base); \ + uint32_t __rem; \ + (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ + if (((n) >> 32) == 0) { \ + __rem = (uint32_t)(n) % __base; \ + (n) = (uint32_t)(n) / __base; \ + } else \ + __rem = __div64_32(&(n), __base); \ + __rem; \ + }) + +#endif /* _ASM_GENERIC_DIV64_H */ |