1 #include "src/lib/16_dbg.h"
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3 // TODO: Could we also provide a build mode to emit debug to the "Bochs E9 hack?"
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9 unsigned char _DEBUG_INITed = 0;
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10 struct info_8250 *_DEBUG_uart = NULL;
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13 if (!_DEBUG_INITed) {
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17 if (!init_8250()) return 0;
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19 // what does the BIOS say the serial ports are?
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20 probe_8250_bios_ports();
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21 for (i=0;i < bios_8250_ports;i++) {
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22 port = get_8250_bios_port(i);
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23 if (port == 0) continue;
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27 // what about the standard serial ports?
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28 for (i=0;i < (sizeof(standard_8250_ports)/sizeof(standard_8250_ports[0]));i++) {
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29 port = standard_8250_ports[i];
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30 if (port == 0) continue;
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34 // pick the first port, which is probably COM1
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35 if (base_8250_ports == 0) return 0; // FIXME: You know "base_8250_ports" is probably a bad variable name for the max entries in info_8250_port[]
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36 _DEBUG_uart = &info_8250_port[0];
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39 // init the COM port.
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40 // in DOSBox-X, the "log" mode will receive our text and print it into the log file
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41 // on real hardware, our text will likely go over a null modem cable to another PC running a serial terminal program like PuTTY or minicom.
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42 // if nothing is connected, then the bytes go off into the ether to get lost and life goes on.
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43 uart_8250_enable_interrupt(_DEBUG_uart,0); // disable interrupts
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44 uart_8250_set_FIFO(_DEBUG_uart,0x07); // enable FIFO (why not?), also clear xmit/recv FIFO buffers, set threshhold to 1 byte
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45 uart_8250_set_MCR(_DEBUG_uart,3); // RTS and DTS on
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46 uart_8250_set_line_control(_DEBUG_uart,UART_8250_LCR_8BIT | UART_8250_LCR_PARITY); // 8 bit 1 stop bit odd parity
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47 uart_8250_set_baudrate(_DEBUG_uart,uart_8250_baud_to_divisor(_DEBUG_uart,9600)); // 9600 baud
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50 return _DEBUG_INITed;
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53 void _DEBUG(const char *msg) {
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54 if (_DEBUG_uart != NULL) {
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57 while ((c=(*msg++)) != 0/*NUL*/) {
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58 while (!uart_8250_can_write(_DEBUG_uart)); // wait for the UART to indicate readiness for our output
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59 uart_8250_write(_DEBUG_uart,(uint8_t)c); // then write it
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64 static char _DEBUGF_TMP[256];
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66 void _DEBUGF(const char *fmt,...) {
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70 vsnprintf(_DEBUGF_TMP,sizeof(_DEBUGF_TMP),fmt,va);
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71 _DEBUG(_DEBUGF_TMP);
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