1 files changed, 127 insertions, 0 deletions

diff --git a/include/asm-mips/div64.h b/include/asm-mips/div64.h
new file mode 100644
index 000000000000..5f7dcf5452e7
--- /dev/null
+++ b/include/asm-mips/div64.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2000, 2004  Maciej W. Rozycki
+ * Copyright (C) 2003 Ralf Baechle
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#ifndef _ASM_DIV64_H
+#define _ASM_DIV64_H
+
+#if (_MIPS_SZLONG == 32)
+
+#include <asm/compiler.h>
+
+/*
+ * No traps on overflows for any of these...
+ */
+
+#define do_div64_32(res, high, low, base) ({ \
+        unsigned long __quot, __mod; \
+        unsigned long __cf, __tmp, __tmp2, __i; \
+        \
+        __asm__(".set   push\n\t" \
+                ".set   noat\n\t" \
+                ".set   noreorder\n\t" \
+                "move   %2, $0\n\t" \
+                "move   %3, $0\n\t" \
+                "b      1f\n\t" \
+                " li    %4, 0x21\n" \
+                "0:\n\t" \
+                "sll    $1, %0, 0x1\n\t" \
+                "srl    %3, %0, 0x1f\n\t" \
+                "or     %0, $1, %5\n\t" \
+                "sll    %1, %1, 0x1\n\t" \
+                "sll    %2, %2, 0x1\n" \
+                "1:\n\t" \
+                "bnez   %3, 2f\n\t" \
+                " sltu  %5, %0, %z6\n\t" \
+                "bnez   %5, 3f\n" \
+                "2:\n\t" \
+                " addiu %4, %4, -1\n\t" \
+                "subu   %0, %0, %z6\n\t" \
+                "addiu  %2, %2, 1\n" \
+                "3:\n\t" \
+                "bnez   %4, 0b\n\t" \
+                " srl   %5, %1, 0x1f\n\t" \
+                ".set   pop" \
+                : "=&r" (__mod), "=&r" (__tmp), "=&r" (__quot), "=&r" (__cf), \
+                  "=&r" (__i), "=&r" (__tmp2) \
+                : "Jr" (base), "0" (high), "1" (low)); \
+        \
+        (res) = __quot; \
+        __mod; })
+
+#define do_div(n, base) ({ \
+        unsigned long long __quot; \
+        unsigned long __mod; \
+        unsigned long long __div; \
+        unsigned long __upper, __low, __high, __base; \
+        \
+        __div = (n); \
+        __base = (base); \
+        \
+        __high = __div >> 32; \
+        __low = __div; \
+        __upper = __high; \
+        \
+        if (__high) \
+                __asm__("divu   $0, %z2, %z3" \
+                        : "=h" (__upper), "=l" (__high) \
+                        : "Jr" (__high), "Jr" (__base) \
+                        : GCC_REG_ACCUM); \
+        \
+        __mod = do_div64_32(__low, __upper, __low, __base); \
+        \
+        __quot = __high; \
+        __quot = __quot << 32 | __low; \
+        (n) = __quot; \
+        __mod; })
+#endif /* (_MIPS_SZLONG == 32) */
+
+#if (_MIPS_SZLONG == 64)
+
+/*
+ * Don't use this one in new code
+ */
+#define do_div64_32(res, high, low, base) ({ \
+        unsigned int __quot, __mod; \
+        unsigned long __div; \
+        unsigned int __low, __high, __base; \
+        \
+        __high = (high); \
+        __low = (low); \
+        __div = __high; \
+        __div = __div << 32 | __low; \
+        __base = (base); \
+        \
+        __mod = __div % __base; \
+        __div = __div / __base; \
+        \
+        __quot = __div; \
+        (res) = __quot; \
+        __mod; })
+
+/*
+ * Hey, we're already 64-bit, no
+ * need to play games..
+ */
+#define do_div(n, base) ({ \
+        unsigned long __quot; \
+        unsigned int __mod; \
+        unsigned long __div; \
+        unsigned int __base; \
+        \
+        __div = (n); \
+        __base = (base); \
+        \
+        __mod = __div % __base; \
+        __quot = __div / __base; \
+        \
+        (n) = __quot; \
+        __mod; })
+
+#endif /* (_MIPS_SZLONG == 64) */
+
+#endif /* _ASM_DIV64_H */