## diffname alphapc/cga.c 1999/0415 ## diff -e /dev/null /n/emeliedump/1999/0415/sys/src/brazil/alphapc/cga.c 0a #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "../port/error.h" #include "io.h" enum { Width = 160, Height = 25, Attr = 0x4f, /* white on blue */ }; static ulong cgabase; #define CGASCREENBASE ((uchar*)cgabase) static int cgapos; static int screeninitdone; static Lock cgascreenlock; static uchar cgaregr(int index) { outb(0x3D4, index); return inb(0x3D4+1) & 0xFF; } static void cgaregw(int index, int data) { outb(0x3D4, index); outb(0x3D4+1, data); } static void movecursor(void) { cgaregw(0x0E, (cgapos/2>>8) & 0xFF); cgaregw(0x0F, cgapos/2 & 0xFF); CGASCREENBASE[cgapos+1] = Attr; } static void cgascreenputc(int c) { int i; if(c == '\n'){ cgapos = cgapos/Width; cgapos = (cgapos+1)*Width; } else if(c == '\t'){ i = 8 - ((cgapos/2)&7); while(i-->0) cgascreenputc(' '); } else if(c == '\b'){ if(cgapos >= 2) cgapos -= 2; cgascreenputc(' '); cgapos -= 2; } else{ CGASCREENBASE[cgapos++] = c; CGASCREENBASE[cgapos++] = Attr; } if(cgapos >= Width*Height){ memmove(CGASCREENBASE, &CGASCREENBASE[Width], Width*(Height-1)); for (i = Width*(Height-1); i < Width*Height;) { CGASCREENBASE[i++] = 0x20; CGASCREENBASE[i++] = Attr; } cgapos = Width*(Height-1); } movecursor(); } void screeninit(void) { cgabase = (ulong)arch->pcimem(0xB8000, 0x8000); cgapos = cgaregr(0x0E)<<8; cgapos |= cgaregr(0x0F); cgapos *= 2; screeninitdone = 1; } static void cgascreenputs(char* s, int n) { if(!screeninitdone) return; if(!islo()){ /* * Don't deadlock trying to * print in an interrupt. */ if(!canlock(&cgascreenlock)) return; } else lock(&cgascreenlock); while(n-- > 0) cgascreenputc(*s++); unlock(&cgascreenlock); } void (*screenputs)(char*, int) = cgascreenputs; . ## diffname alphapc/cga.c 2000/0108 ## diff -e /n/emeliedump/1999/0415/sys/src/brazil/alphapc/cga.c /n/emeliedump/2000/0108/sys/src/9/alphapc/cga.c 110a #else while(n-- > 0) cgascreenputc(*s++); #endif /* notdef */ . 93a #ifdef notdef . ## diffname alphapc/cga.c 2000/0111 ## diff -e /n/emeliedump/2000/0108/sys/src/9/alphapc/cga.c /n/emeliedump/2000/0111/sys/src/9/alphapc/cga.c 112,115d 94d