HelenOS sources
IMR 132 uspace/drv/nic/rtl8139/driver.c pio_write_16(rtl8139->io_port + IMR, rtl8139->int_mask);
IMR 861 uspace/drv/nic/rtl8139/driver.c rtl8139_irq_code.cmds[3].addr = rtl8139->io_addr + IMR;
IMR 375 uspace/drv/nic/rtl8169/driver.c rtl8169_irq_code.cmds[3].addr = rtl8169->regs + IMR;
IMR 772 uspace/drv/nic/rtl8169/driver.c pio_write_16(rtl8169->regs + IMR, 0xffff);
IMR 1068 uspace/drv/nic/rtl8169/driver.c pio_write_16(rtl8169->regs + IMR, 0xffff);
HelenOS homepage, sources at GitHub