serial.h File Reference

#include <stdint.h>

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Functions
void	serial_init_queue (void)
void	serial_putc (uint8_t)
void	serial_flush (void)
void	serial_notify (void)

Function Documentation

serial_flush()

void serial_flush

(

void

)

                    {
    enum intr_level old_level = intr_disable ();
    while (!intq_empty (&txq))
        putc_poll (intq_getc (&txq));
    intr_set_level (old_level);
}

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serial_init_queue()

void serial_init_queue

(

void

)

                         {
    enum intr_level old_level;
 
    if (mode == UNINIT)
        init_poll ();
    ASSERT (mode == POLL);
 
    intr_register_ext (0x20 + 4, serial_interrupt, "serial");
    mode = QUEUE;
    old_level = intr_disable ();
    write_ier ();
    intr_set_level (old_level);
}

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serial_notify()

void serial_notify

(

void

)

                     {
    ASSERT (intr_get_level () == INTR_OFF);
    if (mode == QUEUE)
        write_ier ();
}

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serial_putc()

void serial_putc

(

uint8_t

byte

)

                           {
    enum intr_level old_level = intr_disable ();
 
    if (mode != QUEUE) {
        /* If we're not set up for interrupt-driven I/O yet,
           use dumb polling to transmit a byte. */
        if (mode == UNINIT)
            init_poll ();
        putc_poll (byte);
    } else {
        /* Otherwise, queue a byte and update the interrupt enable
           register. */
        if (old_level == INTR_OFF && intq_full (&txq)) {
            /* Interrupts are off and the transmit queue is full.
               If we wanted to wait for the queue to empty,
               we'd have to reenable interrupts.
               That's impolite, so we'll send a character via
               polling instead. */
            putc_poll (intq_getc (&txq));
        }
 
        intq_putc (&txq, byte);
        write_ier ();
    }
 
    intr_set_level (old_level);
}

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