?? mem.c
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#/* *//* * Memory special file * minor device 0 is physical memory * minor device 1 is kernel memory * minor device 2 is EOF/RATHOLE */#include "../h/param.h"#include "../h/dir.h"#include "../h/user.h"#include "../h/conf.h"#include "../h/seg.h"mmread(dev){ register c, bn, on; int a, d; if(minor(dev) == 2) return; do { bn = u.u_offset >> 6; on = u.u_offset & 077; a = UISA->r[0]; d = UISD->r[0]; spl7(); UISA->r[0] = bn; UISD->r[0] = 077406; if(minor(dev) == 1) UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177); if ((c = fuibyte((caddr_t)on)) < 0) u.u_error = ENXIO; 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(minor(dev) == 2) { u.u_count = 0; return; } for(;;) { bn = u.u_offset >> 6; on = u.u_offset & 077; 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(minor(dev) == 1) UISA->r[0] = (ka6-6)->r[(bn>>7)&07] + (bn & 0177); if (suibyte((caddr_t)on, c) < 0) u.u_error = ENXIO; UISA->r[0] = a; UISD->r[0] = d; spl0(); }}?? 快捷鍵說明
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