struggling with smp and APICs and started vt52 emulation

1 files changed, 49 insertions, 18 deletions

diff --git a/terminal/vt52.c b/terminal/vt52.c
index aa24435..1dc7289 100644
--- a/terminal/vt52.c
+++ b/terminal/vt52.c
@@ -8,10 +8,17 @@
 //              |          |   ---> Screen
 //              ------------
 
+// Interface:
+//
+// struct vt52_tty_struct;  // TODO: check what is better to put in header!
+// vt52_tty vt52_init();
+// put(vt52_tty *tty, uint8_t c);
+//
+//
 
 
 // REQUIREMENTS
-// * kballoc // block alloc
+// * kballoc // block wise in-kernel allocation
 
 #include <stdint.h>
 #include "kernel/kmalloc.h"
@@ -24,42 +31,66 @@
 typedef struct vt52_tty_struct
 {
 
-    uint8_t x;
-    uint8_t y;
-    uint8_t *data; // screen data
+    uint32_t width;
+    uint32_t height;
+    uint32_t x;
+    uint32_t y;
+    uint32_t *data; // screen data
 
 }vt52_tty;
 
 
-vt52_tty *vt52_init()
+vt52_tty vt52_init()
 {
-    vt52_tty *tty=kballoc(sizeof(vt52_tty));
-    return tty;
-}
+    vt52_tty tty;
 
+    tty.data=kballoc(1);
 
-// User interaction
-void putKey(uint32_t code)
-{
+    tty.x=0;
+    tty.y=0;
 
+    tty.width=VT52_WIDTH;
+    tty.height=VT52_HEIGHT;
+
+    return tty;
 }
 
-void refreshScreen()
+uint32_t index(vt52_tty *tty, uint32_t x, uint32_t y)
 {
-
+    return tty->width*y+x;
 }
 
-// Programm Interaction
-void put()
+void set_char(vt52_tty *tty, uint32_t x, uint32_t y, uint32_t c)
 {
-
+    tty->data[index(tty,x,y)]=c;
 }
 
-void get()
+// send one ASCII character to the terminal
+void put(vt52_tty *tty, uint8_t c)
 {
-
+    set_char(tty,tty->x,tty->y,c);
+
+    if(tty->x>tty->width)
+    {
+	tty->x=0;
+	tty->y++;
+    }
+
+    //autoscroll
+    if(tty->y>=tty->height)
+    {
+	tty->y--;
+	for(uint32_t l=tty->y; l>0; l--)
+	{
+	    for(uint32_t x=0;x<tty->width;x++)
+	    {
+		tty->data[index(tty,x,l-1)] = tty->data[index(tty,x,l)];
+	    }
+	}
+    }
 }
 
 
 
 
+