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authorJon Loeliger <jdl@freescale.com>2007-08-13 11:01:52 -0500
committerJon Loeliger <jdl@freescale.com>2007-08-13 11:01:52 -0500
commit8e2dd87eee01bb1b83beab7caf22b851c5cafb2c (patch)
tree47a43e05d90de7d64ed356bab5f15e8d89f5b5cc /include/div64.h
parentcca34967cbd13ff6bd352be29e3f1cc88ab24c05 (diff)
parent9986bc3e40e899bea372a99a2bca4071bdf2e24b (diff)
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Merge commit 'remotes/wd/master'
Conflicts: MAKEALL With any luck, this is the last MAKEALL merge conflict!
Diffstat (limited to 'include/div64.h')
-rw-r--r--include/div64.h39
1 files changed, 39 insertions, 0 deletions
diff --git a/include/div64.h b/include/div64.h
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+#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 */