IPW_SHARED_SRAM_DMA_CONTROL
ipw_zero_memory(priv, IPW_SHARED_SRAM_DMA_CONTROL,
ipw_write_reg32(priv, IPW_DMA_I_CB_BASE, IPW_SHARED_SRAM_DMA_CONTROL);
IPW_SHARED_SRAM_DMA_CONTROL +
current_cb_index = (current_cb_address - IPW_SHARED_SRAM_DMA_CONTROL) /