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-rw-r--r--include/asm-m68k/div64.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-m68k/div64.h b/include/asm-m68k/div64.h
new file mode 100644
index 0000000..9f65de1
--- /dev/null
+++ b/include/asm-m68k/div64.h
@@ -0,0 +1,26 @@
+#ifndef _M68K_DIV64_H
+#define _M68K_DIV64_H
+
+/* n = n / base; return rem; */
+
+#define do_div(n, base) ({ \
+ union { \
+ unsigned long n32[2]; \
+ unsigned long long n64; \
+ } __n; \
+ unsigned long __rem, __upper; \
+ \
+ __n.n64 = (n); \
+ if ((__upper = __n.n32[0])) { \
+ asm ("divul.l %2,%1:%0" \
+ : "=d" (__n.n32[0]), "=d" (__upper) \
+ : "d" (base), "0" (__n.n32[0])); \
+ } \
+ asm ("divu.l %2,%1:%0" \
+ : "=d" (__n.n32[1]), "=d" (__rem) \
+ : "d" (base), "1" (__upper), "0" (__n.n32[1])); \
+ (n) = __n.n64; \
+ __rem; \
+})
+
+#endif /* _M68K_DIV64_H */
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