diff options
Diffstat (limited to 'arch/powerpc/kernel/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 27 |
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. */ |