HelenOS sources
NS16550_REG_LSR 81 kernel/genarch/src/drivers/ns16550/ns16550.c if (ns16550_reg_read(instance, NS16550_REG_LSR) & LSR_DATA_READY)
NS16550_REG_LSR 91 kernel/genarch/src/drivers/ns16550/ns16550.c while (ns16550_reg_read(instance, NS16550_REG_LSR) & LSR_DATA_READY) {
NS16550_REG_LSR 101 kernel/genarch/src/drivers/ns16550/ns16550.c ns16550_reg_read(instance, NS16550_REG_LSR) & LSR_DATA_READY,
NS16550_REG_LSR 108 kernel/genarch/src/drivers/ns16550/ns16550.c !(ns16550_reg_read(instance, NS16550_REG_LSR) & LSR_TH_READY),
HelenOS homepage, sources at GitHub