mirror of
https://github.com/xcat2/confluent.git
synced 2024-11-22 09:32:21 +00:00
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
#include <termios.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#define COM1 0x3f8
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#define COM2 0x2f8
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#define COM3 0x3e8
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#define COM4 0x2e8
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#define SPEEDNOOP 0
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#define SPEED9600 3
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#define SPEED19200 4
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#define SPEED57600 6
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#define SPEED115200 7
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int main(int argc, char* argv[]) {
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struct termios tty;
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int ttyf;
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int spcr;
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int currspeed;
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speed_t cspeed;
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char buff[128];
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uint64_t address;
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spcr = open("/sys/firmware/acpi/tables/SPCR", O_RDONLY);
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if (spcr < 0) {
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exit(0);
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}
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if (read(spcr, buff, 80) < 80) {
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exit(0);
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}
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if (buff[8] != 2) exit(0); //revision 2
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if (buff[36] != 0) exit(0); //16550 only
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if (buff[40] != 1) exit(0); //IO only
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address = *(uint64_t *)(buff + 44);
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currspeed = buff[58];
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if (address == COM1) {
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strncpy(buff, "/dev/ttyS0", 128);
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} else if (address == COM2) {
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strncpy(buff, "/dev/ttyS1", 128);
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} else if (address == COM3) {
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strncpy(buff, "/dev/ttyS2", 128);
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} else if (address == COM4) {
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strncpy(buff, "/dev/ttyS3", 128);
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} else {
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exit(0);
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}
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if (currspeed == SPEED9600) {
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cspeed = B9600;
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} else if (currspeed == SPEED19200) {
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cspeed = B19200;
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} else if (currspeed == SPEED57600) {
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cspeed = B57600;
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} else if (currspeed == SPEED115200) {
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cspeed = B115200;
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} else if (currspeed == SPEED115200) {
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cspeed = 0;
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} else {
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exit(0);
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}
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printf("%s\n", buff);
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ttyf = open(buff, O_RDWR | O_NOCTTY);
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tcgetattr(ttyf, &tty);
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if (cspeed) {
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cfsetospeed(&tty, B115200);
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cfsetispeed(&tty, B115200);
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}
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tcsetattr(ttyf, TCSANOW, &tty);
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ioctl(ttyf, TIOCCONS, 0);
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}
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