1 files changed, 27 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 0b0e908b5065..303229b090b8 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -36,6 +36,33 @@ _GLOBAL(__delay)
         blr
 
 /*
+ * This returns the high 64 bits of the product of two 64-bit numbers.
+ */
+_GLOBAL(mulhdu)
+        cmpwi   r6,0
+        cmpwi   cr1,r3,0
+        mr      r10,r4
+        mulhwu  r4,r4,r5
+        beq     1f
+        mulhwu  r0,r10,r6
+        mullw   r7,r10,r5
+        addc    r7,r0,r7
+        addze   r4,r4
+1:      beqlr   cr1             /* all done if high part of A is 0 */
+        mr      r10,r3
+        mullw   r9,r3,r5
+        mulhwu  r3,r3,r5
+        beq     2f
+        mullw   r0,r10,r6
+        mulhwu  r8,r10,r6
+        addc    r7,r0,r7
+        adde    r4,r4,r8
+        addze   r3,r3
+2:      addc    r4,r4,r9
+        addze   r3,r3
+        blr
+
+/*
  * Returns (address we're running at) - (address we were linked at)
  * for use before the text and data are mapped to KERNELBASE.
  */