44 lines
816 B
C
44 lines
816 B
C
/**
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* Serial Port Driver
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*/
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#include <system.h>
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#define SERIAL_PORT_A 0x3F8
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#define SERIAL_PORT_B 0x2F8
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#define SERIAL_PORT_C 0x3E8
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#define SERIAL_PORT_D 0x2E8
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void
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serial_install() {
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/* We will initialize the first serial port */
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outportb(SERIAL_PORT_A + 1, 0x00);
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outportb(SERIAL_PORT_A + 3, 0x80);
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outportb(SERIAL_PORT_A + 0, 0x03);
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outportb(SERIAL_PORT_A + 1, 0x00);
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outportb(SERIAL_PORT_A + 3, 0x03);
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outportb(SERIAL_PORT_A + 2, 0xC7);
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outportb(SERIAL_PORT_A + 4, 0x0B);
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}
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int
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serial_rcvd() {
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return inportb(SERIAL_PORT_A + 5) & 1;
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}
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char
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serial_recv() {
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while (serial_rcvd() == 0);
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return inportb(SERIAL_PORT_A);
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}
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int
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serial_transmit_empty() {
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return inportb(SERIAL_PORT_A + 5) & 0x20;
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}
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void
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serial_send(char out) {
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while (serial_transmit_empty() == 0);
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outportb(SERIAL_PORT_A, out);
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}
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