Add to MMU init: bypass cache in MMIO page

[pdp11-memory-test] / pdp11.c

#include <stdint.h>

/*
 * Polled console I/O
 */

#define RCSR (*((volatile uint16_t *)0177560))
#define RBUF (*((volatile uint16_t *)0177562))
#define XCSR (*((volatile uint16_t *)0177564))
#define XBUF (*((volatile uint16_t *)0177566))

void
putch(uint16_t c)
{
    while((XCSR && 0200) == 0) continue;
    XBUF = c;
}

uint16_t
getch(void)
{
    while((RCSR && 0200) == 0) continue;
    return RBUF;
}

/*
 * Busy-loop
 */

void
wait(uint16_t count)
{
    while (count--) continue;
}