71 lines
1.1 KiB
C
71 lines
1.1 KiB
C
#
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/*
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*/
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/*
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* Memory special file
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* minor device 0 is physical memory
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* minor device 1 is kernel memory
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* minor device 2 is EOF/RATHOLE
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*/
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#include "../param.h"
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#include "../user.h"
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#include "../conf.h"
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#include "../seg.h"
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mmread(dev)
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{
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register c, bn, on;
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int a, d;
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if(dev.d_minor == 2)
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return;
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do {
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bn = lshift(u.u_offset, -6);
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on = u.u_offset[1] & 077;
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a = UISA->r[0];
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d = UISD->r[0];
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spl7();
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UISA->r[0] = bn;
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UISD->r[0] = 077406;
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if(dev.d_minor == 1)
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UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177);
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c = fuibyte(on);
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UISA->r[0] = a;
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UISD->r[0] = d;
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spl0();
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} while(u.u_error==0 && passc(c)>=0);
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}
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mmwrite(dev)
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{
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register c, bn, on;
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int a, d;
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if(dev.d_minor == 2) {
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c = u.u_count;
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u.u_count = 0;
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u.u_base =+ c;
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dpadd(u.u_offset, c);
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return;
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}
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for(;;) {
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bn = lshift(u.u_offset, -6);
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on = u.u_offset[1] & 077;
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if ((c=cpass())<0 || u.u_error!=0)
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break;
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a = UISA->r[0];
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d = UISD->r[0];
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spl7();
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UISA->r[0] = bn;
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UISD->r[0] = 077406;
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if(dev.d_minor == 1)
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UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177);
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suibyte(on, c);
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UISA->r[0] = a;
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UISD->r[0] = d;
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spl0();
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}
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}
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