introduce explicit signed/unsigned 64bit divide

[pandora-kernel.git] / include / asm-x86 / div64.h

diff --git a/include/asm-x86/div64.h b/include/asm-x86/div64.h
index 0dbf8bf..c7892cf 100644 (file)
--- a/include/asm-x86/div64.h
+++ b/include/asm-x86/div64.h
@@ -51,6 +51,26 @@ static inline long div_ll_X_l_rem(long long divs, long div, long *rem)
 
 }
 
+static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
+{
+       union {
+               u64 v64;
+               u32 v32[2];
+       } d = { dividend };
+       u32 upper;
+
+       upper = d.v32[1];
+       d.v32[1] = 0;
+       if (upper >= divisor) {
+               d.v32[1] = upper / divisor;
+               upper %= divisor;
+       }
+       asm ("divl %2" : "=a" (d.v32[0]), "=d" (*remainder) :
+               "rm" (divisor), "0" (d.v32[0]), "1" (upper));
+       return d.v64;
+}
+#define div_u64_rem    div_u64_rem
+
 extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
 
 #else