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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/m68k/include/asm/div64.h
Initial import
Diffstat (limited to 'arch/m68k/include/asm/div64.h')
-rw-r--r--arch/m68k/include/asm/div64.h35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/m68k/include/asm/div64.h b/arch/m68k/include/asm/div64.h
new file mode 100644
index 000000000..ef881cfbb
--- /dev/null
+++ b/arch/m68k/include/asm/div64.h
@@ -0,0 +1,35 @@
+#ifndef _M68K_DIV64_H
+#define _M68K_DIV64_H
+
+#ifdef CONFIG_CPU_HAS_NO_MULDIV64
+#include <asm-generic/div64.h>
+#else
+
+#include <linux/types.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; \
+ unsigned long __base = (base); \
+ \
+ __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 /* CONFIG_CPU_HAS_NO_MULDIV64 */
+
+#endif /* _M68K_DIV64_H */