BT_CTRL_REG
value = INB(sc, BT_CTRL_REG);
v = INB(sc, BT_CTRL_REG);
OUTB(sc, BT_CTRL_REG, v);
OUTB(sc, BT_CTRL_REG, BT_C_CLR_WR_PTR);
OUTB(sc, BT_CTRL_REG, BT_C_H2B_ATN);
OUTB(sc, BT_CTRL_REG, BT_C_H_BUSY);
OUTB(sc, BT_CTRL_REG, BT_C_B2H_ATN);
OUTB(sc, BT_CTRL_REG, BT_C_CLR_RD_PTR);
OUTB(sc, BT_CTRL_REG, BT_C_H_BUSY);