90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
#include "serial.h"
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/*
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* SERIAL_LINE_COMMAND_PORT configuration
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* Bit: | 7 | 6 | 5 4 3 | 2 | 1 0 |
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* Content: | d | b | prty | s | dl |
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* d = enable/disable DLAB
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* b = enable/disable break control
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* prty = # of parity bits to use
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* s = # no of stop bits [0 is 1] and [1 is 1.5 or 2]
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* dl = length of data
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*
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*/
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void serial_set_baud_rate(const u16 com_port, const u16 divisor) {
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// Activate line - ready to send higher 8 bits of data
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// send the higher 8 bits first
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// send the lower 8 bits next
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serialport_write_byte(SERIAL_LINE_COMMAND_PORT(com_port),
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SERIAL_LINE_ENABLE);
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serialport_write_byte(SERIAL_DATA_PORT(com_port),
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(divisor>>8) & 0x00ff);
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serialport_write_byte(SERIAL_DATA_PORT(com_port),
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divisor & 0x00ff);
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}
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// Payload described above
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void serial_configure_line(const u16 line, const u8 payload) {
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serialport_write_byte(SERIAL_LINE_COMMAND_PORT(line), payload);
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}
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u8 serial_fifo_empty(const u16 com_port) {
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// we get back 0x20 if it is empty
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return serial_read_byte(SERIAL_LINE_STATUS_PORT(com_port)) &
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SERIAL_FIFO_EMPTY_CODE;
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}
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u64 serial_write(const char* buffer, const u64 size) {
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/*
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* Writes a given buffer to the com1 serial port for debugging in bochs
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*/
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serialport_write_byte(SERIAL_DATA_PORT_INT_EN(SERIAL_COM1_BASE),
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0x00);
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serialport_write_byte(SERIAL_LINE_COMMAND_PORT(SERIAL_COM1_BASE),
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SERIAL_LINE_ENABLE);
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// quarter speed hopefully the fifo quue wont fill this way
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serialport_write_byte(SERIAL_COM1_BASE,
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0x01);
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serialport_write_byte(SERIAL_DATA_PORT_INT_EN(SERIAL_COM1_BASE),
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0x00);
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serialport_write_byte(SERIAL_LINE_COMMAND_PORT(SERIAL_COM1_BASE),
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SERIAL_DEFAULT_LINE_CFG);
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serialport_write_byte(SERIAL_FIFO_COMMAND_PORT(SERIAL_COM1_BASE),
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SERIAL_DEFAULT_BUFFER_CFG);
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serialport_write_byte(SERIAL_MODEM_COMMAND_PORT(SERIAL_COM1_BASE),
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0x0B);
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u64 idx;
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for(idx =0; idx < size; idx++) {
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serialport_write_byte(SERIAL_COM1_BASE, buffer[idx]);
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}
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return idx;
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}
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void serial_pic_ack(u32 interrupt) {
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// ignore things that are too small and too big
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if(interrupt < PIC1_START_INT || interrupt > PIC2_END_INT) {
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return;
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}
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// Send acknoldgement to the pic that we have handled the interrupt
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// without this it literally just wait for the ack
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if(interrupt < PIC2_START_INT) {
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serialport_write_byte(PIC1_PORT, PIC_ACK);
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}
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else {
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serialport_write_byte(PIC2_PORT, PIC_ACK);
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}
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}
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