UNIX 6th Ed. - /usr/sys/dmr/mem.c

   1: #
   2: /*
   3:  */
   4: 
   5: /*
   6:  *	Memory special file
   7:  *	minor device 0 is physical memory
   8:  *	minor device 1 is kernel memory
   9:  *	minor device 2 is EOF/RATHOLE
  10:  */
  11: 
  12: #include "../param.h"
  13: #include "../user.h"
  14: #include "../conf.h"
  15: #include "../seg.h"
  16: 
  17: mmread(dev)
  18: {
  19:     register c, bn, on;
  20:     int a, d;
  21: 
  22:     if(dev.d_minor == 2)
  23:         return;
  24:     do {
  25:         bn = lshift(u.u_offset, -6);
  26:         on = u.u_offset[1] & 077;
  27:         a = UISA->r[0];
  28:         d = UISD->r[0];
  29:         spl7();
  30:         UISA->r[0] = bn;
  31:         UISD->r[0] = 077406;
  32:         if(dev.d_minor == 1)
  33:             UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177);
  34:         c = fuibyte(on);
  35:         UISA->r[0] = a;
  36:         UISD->r[0] = d;
  37:         spl0();
  38:     } while(u.u_error==0 && passc(c)>=0);
  39: }
  40: 
  41: mmwrite(dev)
  42: {
  43:     register c, bn, on;
  44:     int a, d;
  45: 
  46:     if(dev.d_minor == 2) {
  47:         c = u.u_count;
  48:         u.u_count = 0;
  49:         u.u_base =+ c;
  50:         dpadd(u.u_offset, c);
  51:         return;
  52:     }
  53:     for(;;) {
  54:         bn = lshift(u.u_offset, -6);
  55:         on = u.u_offset[1] & 077;
  56:         if ((c=cpass())<0 || u.u_error!=0)
  57:             break;
  58:         a = UISA->r[0];
  59:         d = UISD->r[0];
  60:         spl7();
  61:         UISA->r[0] = bn;
  62:         UISD->r[0] = 077406;
  63:         if(dev.d_minor == 1)
  64:             UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177);
  65:         suibyte(on, c);
  66:         UISA->r[0] = a;
  67:         UISD->r[0] = d;
  68:         spl0();
  69:     }
  70: }

Defined functions