| 1 | #include <stdint.h> |
| 2 | |
| 3 | /* |
| 4 | * Polled console I/O |
| 5 | */ |
| 6 | |
| 7 | #define RCSR (*((volatile uint16_t *)0177560)) |
| 8 | #define RBUF (*((volatile uint16_t *)0177562)) |
| 9 | #define XCSR (*((volatile uint16_t *)0177564)) |
| 10 | #define XBUF (*((volatile uint16_t *)0177566)) |
| 11 | |
| 12 | void |
| 13 | putch(uint16_t c) |
| 14 | { |
| 15 | while((XCSR && 0200) == 0) continue; |
| 16 | XBUF = c; |
| 17 | } |
| 18 | |
| 19 | uint16_t |
| 20 | getch(void) |
| 21 | { |
| 22 | while((RCSR && 0200) == 0) continue; |
| 23 | return RBUF; |
| 24 | } |
| 25 | |
| 26 | /* |
| 27 | * Busy-loop |
| 28 | */ |
| 29 | |
| 30 | void |
| 31 | wait(uint16_t count) |
| 32 | { |
| 33 | while (count--) continue; |
| 34 | } |