PART_MASK
i->partnum = (ltq_r32(FALCON_CHIPID) & PART_MASK) >> PART_SHIFT;
i->partnum = (ltq_r32(LTQ_MPS_CHIPID) & PART_MASK) >> PART_SHIFT;
i = ctx->pos & ~PART_MASK;
ctx->pos = (ctx->pos & PART_MASK) | i;
count = ((ctx->pos & PART_MASK) >> PART_SHIFT) - 1;
ctx->pos = (ctx->pos & PART_MASK) +
if ((ctx->pos & PART_MASK) == 0)