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| author | Markus Klotzbuecher <mk@denx.de> | 2007-09-17 17:12:45 +0200 |
|---|---|---|
| committer | Markus Klotzbuecher <mk@pollux.denx.de> | 2007-09-17 17:12:45 +0200 |
| commit | f930922f061ea7bf585296859d1c14194c24b840 (patch) | |
| tree | c46b9f120f7c55f5baf8b6ac3048ba759e10a512 /include/div64.h | |
| parent | 97213f32416ead885deafea86774e912ffd60ad0 (diff) | |
| parent | 67c31036acaaaa992fc346cc89db0909a7e733c4 (diff) | |
| download | u-boot-imx-f930922f061ea7bf585296859d1c14194c24b840.zip u-boot-imx-f930922f061ea7bf585296859d1c14194c24b840.tar.gz u-boot-imx-f930922f061ea7bf585296859d1c14194c24b840.tar.bz2 | |
Merge with git://www.denx.de/git/u-boot.git
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 */ |