ibm4xx_blkcpy
ibm4xx_blkcpy((void *)dst, (void *)src, PAGE_SIZE, true);
ibm4xx_blkcpy(kp, up, len, true);
ibm4xx_blkcpy(up, kp, len, true);
ibm4xx_blkcpy(dst + doff, src + soff,
ibm4xx_blkcpy(dst, src, len, false);
void ibm4xx_blkcpy(void *, const void *, size_t, bool);