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/xen-4.10.0-shim-comet/tools/firmware/hvmloader/
A Dutil.c837 uint16_t ier = uart_base + 1; in uart_exists() local
840 a = inb(ier); in uart_exists()
841 outb(ier, 0); in uart_exists()
842 b = inb(ier); in uart_exists()
843 outb(ier, 0xf); in uart_exists()
844 c = inb(ier); in uart_exists()
845 outb(ier, a); in uart_exists()
/xen-4.10.0-shim-comet/xen/drivers/char/
A Dns16550.c883 u8 ier = ns_read_reg(uart, UART_IER); in ns16550_start_tx() local
886 if ( !(ier & UART_IER_ETHREI) ) in ns16550_start_tx()
887 ns_write_reg(uart, UART_IER, ier | UART_IER_ETHREI); in ns16550_start_tx()
893 u8 ier = ns_read_reg(uart, UART_IER); in ns16550_stop_tx() local
896 if ( ier & UART_IER_ETHREI ) in ns16550_stop_tx()
897 ns_write_reg(uart, UART_IER, ier & ~UART_IER_ETHREI); in ns16550_stop_tx()

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