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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 /lib_generic/div64.c | |
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 'lib_generic/div64.c')
-rw-r--r-- | lib_generic/div64.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/lib_generic/div64.c b/lib_generic/div64.c new file mode 100644 index 0000000..d9951b5 --- /dev/null +++ b/lib_generic/div64.c @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com> + * + * Based on former do_div() implementation from asm-parisc/div64.h: + * Copyright (C) 1999 Hewlett-Packard Co + * Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> + * + * + * Generic C version of 64bit/32bit division and modulo, with + * 64bit result and 32bit remainder. + * + * The fast case for (n>>32 == 0) is handled inline by do_div(). + * + * Code generated for this function might be very inefficient + * for some CPUs. __div64_32() can be overridden by linking arch-specific + * assembly versions such as arch/ppc/lib/div64.S and arch/sh/lib/div64.S. + */ + +#include <linux/types.h> + +uint32_t __div64_32(uint64_t *n, uint32_t base) +{ + uint64_t rem = *n; + uint64_t b = base; + uint64_t res, d = 1; + uint32_t high = rem >> 32; + + /* Reduce the thing a bit first */ + res = 0; + if (high >= base) { + high /= base; + res = (uint64_t) high << 32; + rem -= (uint64_t) (high*base) << 32; + } + + while ((int64_t)b > 0 && b < rem) { + b = b+b; + d = d+d; + } + + do { + if (rem >= b) { + rem -= b; + res += d; + } + b >>= 1; + d >>= 1; + } while (d); + + *n = res; + return rem; +} |