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confluent/confluent_osdeploy/utils/autocons.c
Jarrod Johnson e0c59cc341 Fixup c utilities and add start_root
The diskless will use start_root to boot the 'main' OS as a container.
2021-06-03 17:06:10 -04:00

130 lines
3.3 KiB
C

#include <errno.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#define COM1 0x3f8
#define COM2 0x2f8
#define COM3 0x3e8
#define COM4 0x2e8
#define SPEEDNOOP 0
#define SPEED9600 3
#define SPEED19200 4
#define SPEED57600 6
#define SPEED115200 7
int main(int argc, char* argv[]) {
struct termios tty;
struct termios tty2;
struct winsize ws;
unsigned width, height;
int ttyf;
int tmpi;
int currspeed;
int flags;
speed_t cspeed;
char buff[128];
int bufflen;
fd_set set;
struct timeval timeout;
char* offset;
uint64_t address;
bufflen = 0;
tmpi = open("/sys/firmware/acpi/tables/SPCR", O_RDONLY);
if (tmpi < 0) {
exit(0);
}
if (read(tmpi, buff, 80) < 80) {
exit(0);
}
close(tmpi);
if (buff[8] != 2) exit(0); //revision 2
if (buff[36] != 0) exit(0); //16550 only
if (buff[40] != 1) exit(0); //IO only
address = *(uint64_t *)(buff + 44);
currspeed = buff[58];
offset = buff + 10;
if (address == COM1) {
strncpy(buff, "/dev/ttyS0", 128);
} else if (address == COM2) {
strncpy(buff, "/dev/ttyS1", 128);
} else if (address == COM3) {
strncpy(buff, "/dev/ttyS2", 128);
} else if (address == COM4) {
strncpy(buff, "/dev/ttyS3", 128);
} else {
exit(0);
}
ttyf = open(buff, O_RDWR | O_NOCTTY);
if (currspeed == SPEED9600) {
cspeed = B9600;
strcpy(offset, ",9600");
} else if (currspeed == SPEED19200) {
cspeed = B19200;
strcpy(offset, ",19200");
} else if (currspeed == SPEED57600) {
cspeed = B57600;
strcpy(offset, ",57600");
} else if (currspeed == SPEED115200) {
cspeed = B115200;
strcpy(offset, ",115200");
} else {
exit(0);
}
tcgetattr(ttyf, &tty);
if (cspeed) {
cfsetospeed(&tty, cspeed);
cfsetispeed(&tty, cspeed);
}
printf("%s\n", buff);
tcgetattr(ttyf, &tty2);
cfmakeraw(&tty2);
tcsetattr(ttyf, TCSANOW, &tty2);
flags = fcntl(ttyf, F_GETFL, 0);
fcntl(ttyf, F_SETFL, flags | O_NONBLOCK);
while (read(ttyf, buff, 64) > 0) {
// Drain any pending reads
}
timeout.tv_sec = 0;
timeout.tv_usec = 500000;
FD_ZERO(&set);
FD_SET(ttyf, &set);
if (write(ttyf, "\0337\033[999;999H\033[6n\0338", 18) < 0) {};
while (select(ttyf + 1, &set, NULL, NULL, &timeout) > 0) {
if ((tmpi = read(ttyf, buff + bufflen, 127 - bufflen)) < 0) {
if (errno == EAGAIN || errno == EWOULDBLOCK) {
continue;
} else {
break;
}
}
bufflen += tmpi;
buff[bufflen] = 0;
if (strchr(buff, 'R')) {
break;
}
}
fcntl(ttyf, F_SETFL, flags);
ws.ws_xpixel = 0;
ws.ws_ypixel = 0;
if (sscanf(buff, "\033[%u;%uR", &height, &width) == 2) {
ws.ws_col = width;
ws.ws_row = height;
} else {
ws.ws_col = 100;
ws.ws_row = 31;
}
if (ws.ws_col < 80) { ws.ws_col = 80; }
if (ws.ws_row < 24) { ws.ws_col = 24; }
ioctl(ttyf, TIOCSWINSZ, &ws);
tcsetattr(ttyf, TCSANOW, &tty);
ioctl(ttyf, TIOCCONS, 0);
}