U?ytkownik li napisa?: >Hi all, >i need do a lot of byteorder changing operation from big-endian to >little-endian. cpu_to_le32 is not fast enough for me, does anyone have such a >routine written in asm.? >PS: here is an ugly asm function do such thing: >void swapbyte(unsigned long *val, unsigned long offset, > unsigned long value) >{ > > asm ("lis 3 %0 at ha" : "=r" (val)); > asm ("lwz 3,%0 at l(3)" : "=r" (val)); > asm ("stw %1, 0(4)" : "=r" (offset)); > asm ("stw %2, 0(5)" : "=r" (value)); > asm ("stwbrx 5, 3, 4"); >}val is the address of value. i used to set this function as inline, but >kernel said: >Oops: kernel access of bad area, sig: 11 >Any comments >Best Regards! >Li > > > > > try DIRECT using out_le16/32 in_le16/32 from <asm/io.h>, this takes same time as one big endian write/read
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