diff options
Diffstat (limited to 'dlog.h')
| -rw-r--r-- | dlog.h | 66 |
1 files changed, 59 insertions, 7 deletions
@@ -20,16 +20,67 @@ #ifndef DLOG_H #define DLOG_H -#define ENABLE_DLOG 1 +#include <conio.h> + +// Customizable defines +/** If 0, these routines become nops */ +#define ENABLE_DLOG 0 +/** 1 means target serial port, 0 means target IO port. */ +#define DLOG_TARGET_SERIAL 1 +/** IO port to target. + * VirtualBox uses 0x504, Bochs, DOSBox and descendants use 0xE9. + * When using DLOG_TARGET_SERIAL, use desired UART IO base port. (e.g. COM1 = 0x3F8). */ +#define DLOG_TARGET_PORT 0x3f8 + +// End of customizable defines #if ENABLE_DLOG -#if 1 -#include "vboxlog.h" -#define dlog_putc vbox_log_putc -#endif +/** Initializes the debug log port. */ +static void dlog_init(); + +/** Logs a single character to the debug message IO port. */ +static inline void dlog_putc(char c); + +#if DLOG_TARGET_SERIAL + +static void dlog_init() +{ + // Comes straight from https://wiki.osdev.org/Serial_Ports#Initialization + outp(DLOG_TARGET_PORT + 1, 0x00); // Disable all interrupts + outp(DLOG_TARGET_PORT + 3, 0x80); // Enable DLAB (set baud rate divisor) + outp(DLOG_TARGET_PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud + outp(DLOG_TARGET_PORT + 1, 0x00); // (hi byte) + outp(DLOG_TARGET_PORT + 3, 0x03); // 8 bits, no parity, one stop bit + outp(DLOG_TARGET_PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold + outp(DLOG_TARGET_PORT + 4, 0x03); // RTS/DSR set, IRQs disabled +} + +static inline void dlog_putc(char c) +{ + while (!(inp(DLOG_TARGET_PORT + 5) & 0x20)); + outp(DLOG_TARGET_PORT, c); +} + +#else /* DLOG_TARGET_SERIAL */ -#define dlog_endline() dlog_putc('\n') +static void dlog_init() +{ +} + +static inline void dlog_putc(char c) +{ + outp(DLOG_TARGET_PORT, c); +} + + + +#endif /* DLOG_TARGET_SERIAL */ + +static void dlog_endline(void) +{ + dlog_putc('\n'); +} /** Print string to log */ static void dlog_print(const char *s) @@ -105,8 +156,9 @@ static void dlog_printd(int num) dlog_printdb(num, 10); } -#else +#else /* ENABLE_DLOG */ +#define dlog_init() #define dlog_putc(c) #define dlog_endline() #define dlog_print(s) |