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-rw-r--r--include/asm-m32r/div64.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/include/asm-m32r/div64.h b/include/asm-m32r/div64.h
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+++ b/include/asm-m32r/div64.h
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+#ifndef _ASM_M32R_DIV64
+#define _ASM_M32R_DIV64
+
+/* $Id$ */
+
+/* unsigned long long division.
+ * Input:
+ * unsigned long long n
+ * unsigned long base
+ * Output:
+ * n = n / base;
+ * return value = n % base;
+ */
+#define do_div(n, base) \
+({ \
+ unsigned long _res, _high, _mid, _low; \
+ \
+ _low = (n) & 0xffffffffUL; \
+ _high = (n) >> 32; \
+ if (_high) { \
+ _mid = (_high % (unsigned long)(base)) << 16; \
+ _high = _high / (unsigned long)(base); \
+ _mid += _low >> 16; \
+ _low &= 0x0000ffffUL; \
+ _low += (_mid % (unsigned long)(base)) << 16; \
+ _mid = _mid / (unsigned long)(base); \
+ _res = _low % (unsigned long)(base); \
+ _low = _low / (unsigned long)(base); \
+ n = _low + ((long long)_mid << 16) + \
+ ((long long)_high << 32); \
+ } else { \
+ _res = _low % (unsigned long)(base); \
+ n = (_low / (unsigned long)(base)); \
+ } \
+ _res; \
+})
+
+#endif /* _ASM_M32R_DIV64 */
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