cga.c

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SearchContext: - none - 3 - 10

    1 #include "u.h"
    2 #include "../port/lib.h"
    3 #include "mem.h"
    4 #include "dat.h"
    5 #include "fns.h"
    6 #include "../port/error.h"
    7 #include "io.h"
    8 
    9 enum {
   10         Width           = 160,
   11         Height          = 25,
   12 
   13         Attr            = 0x4f, /* white on blue */
   14 };
   15 
   16 static ulong    cgabase;
   17 #define CGASCREENBASE   ((uchar*)cgabase)
   18 
   19 static int cgapos;
   20 static int screeninitdone;
   21 static Lock cgascreenlock;
   22 
   23 static uchar
   24 cgaregr(int index)
   25 {
   26         outb(0x3D4, index);
   27         return inb(0x3D4+1) & 0xFF;
   28 }
   29 
   30 static void
   31 cgaregw(int index, int data)
   32 {
   33         outb(0x3D4, index);
   34         outb(0x3D4+1, data);
   35 }
   36 
   37 static void
   38 movecursor(void)
   39 {
   40         cgaregw(0x0E, (cgapos/2>>8) & 0xFF);
   41         cgaregw(0x0F, cgapos/2 & 0xFF);
   42         CGASCREENBASE[cgapos+1] = Attr;
   43 }
   44 
   45 static void
   46 cgascreenputc(int c)
   47 {
   48         int i;
   49 
   50         if(c == '\n'){
   51                 cgapos = cgapos/Width;
   52                 cgapos = (cgapos+1)*Width;
   53         }
   54         else if(c == '\t'){
   55                 i = 8 - ((cgapos/2)&7);
   56                 while(i-->0)
   57                         cgascreenputc(' ');
   58         }
   59         else if(c == '\b'){
   60                 if(cgapos >= 2)
   61                         cgapos -= 2;
   62                 cgascreenputc(' ');
   63                 cgapos -= 2;
   64         }
   65         else{
   66                 CGASCREENBASE[cgapos++] = c;
   67                 CGASCREENBASE[cgapos++] = Attr;
   68         }
   69         if(cgapos >= Width*Height){
   70                 memmove(CGASCREENBASE, &CGASCREENBASE[Width], Width*(Height-1));
   71                 for (i = Width*(Height-1); i < Width*Height;) {
   72                         CGASCREENBASE[i++] = 0x20;
   73                         CGASCREENBASE[i++] = Attr;
   74                 }
   75                 cgapos = Width*(Height-1);
   76         }
   77         movecursor();
   78 }
   79 
   80 void
   81 screeninit(void)
   82 {
   83         cgabase = (ulong)arch->pcimem(0xB8000, 0x8000);
   84 
   85         cgapos = cgaregr(0x0E)<<8;
   86         cgapos |= cgaregr(0x0F);
   87         cgapos *= 2;
   88         screeninitdone = 1;
   89 }
   90 
   91 static void
   92 cgascreenputs(char* s, int n)
   93 {
   94         if(!screeninitdone)
   95                 return;
   96         if(!islo()){
   97                 /*
   98                  * Don't deadlock trying to
   99                  * print in an interrupt.
  100                  */
  101                 if(!canlock(&cgascreenlock))
  102                         return;
  103         }
  104         else
  105                 lock(&cgascreenlock);
  106 
  107         while(n-- > 0)
  108                 cgascreenputc(*s++);
  109 
  110         unlock(&cgascreenlock);
  111 }
  112 
  113 void (*screenputs)(char*, int) = cgascreenputs;

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FreeBSD/Linux Kernel Cross Reference sys/alphapc/cga.c

FreeBSD/Linux Kernel Cross Reference
sys/alphapc/cga.c