AUSAM/sys106/dmr/mem.c

#
/*
 */

/*
 *	Memory special file
 *	minor device 0 is physical memory
 *	minor device 1 is kernel data space memory
 *	minor device 2 is EOF/RATHOLE
 *	minor device 3 is kernel instruction space memory
 */

#include "../defines.h"
#include "../param.h"
#include "../user.h"
#include "../conf.h"
#include "../seg.h"

#ifdef	_1170 | _1145
#define	KISA	0172340
#endif

mmread(dev)
{
	register c, bn, on;
	int a, d;

	if(dev.d_minor == 2)
		return;
	do {
		bn = u.u_offset >> 6;
		on = u.u_offset & 077; /* fix000 */
		a = UISA->r[0];
		d = UISD->r[0];
		spl7();
		UISA->r[0] = bn;
		UISD->r[0] = 077406;
		if(dev.d_minor == 1)
			UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177);
#ifdef	_1170 | _1145
		else if(dev.d_minor == 3)
			UISA->r[0] = KISA->r[(bn>>7)&07] + (bn & 0177);
#endif
		c = fuibyte(on);
		if(u.u_error)				/* fix025 fix037 */
			u.u_error = ENXIO;		/* fix025 */
		UISA->r[0] = a;
		UISD->r[0] = d;
		spl0();
	} while(u.u_error==0 && passc(c)>=0);
}

mmwrite(dev)
{
	register c, bn, on;
	int a, d;

	if(dev.d_minor == 2) {
		c = u.u_count;
		u.u_count = 0;
		u.u_base =+ c;
		u.u_offset =+ c.unsignd;	/* fix000 */
		return;
	}
	for(;;) {
		bn = u.u_offset >> 6;
		on = u.u_offset & 077; /* fix000 */
		if ((c=cpass())<0 || u.u_error!=0)
			break;
		a = UISA->r[0];
		d = UISD->r[0];
		spl7();
		UISA->r[0] = bn;
		UISD->r[0] = 077406;
		if(dev.d_minor == 1)
			UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177);
#ifdef	_1170 | _1145
		else if(dev.d_minor == 3)
			UISA->r[0] = KISA->r[(bn>>7)&07] + (bn & 0177);
#endif
		if(suibyte(on,c) < 0)		/* fix025 */
			u.u_error = ENXIO;		/* fix025 */
		UISA->r[0] = a;
		UISD->r[0] = d;
		spl0();
	}
}