Virtual memory & paging

[lunaix-os.git] / lunaix-os / kernel / tty / tty.c

diff --git a/lunaix-os/kernel/tty/tty.c b/lunaix-os/kernel/tty/tty.c
index 2629c747f96b1dae44324895d09675ed18a315c4..cb4e13a1d21954182363b280b2ca84c1d6bf6487 100644 (file)
--- a/lunaix-os/kernel/tty/tty.c
+++ b/lunaix-os/kernel/tty/tty.c
@@ -1,21 +1,31 @@
 #include <libc/string.h>
 #include <lunaix/tty/tty.h>
+#include <lunaix/constants.h>
 #include <stdint.h>
 
 #define TTY_WIDTH 80
 #define TTY_HEIGHT 25
 
-vga_attribute* buffer = (vga_attribute*)0xB8000;
+vga_attribute* tty_vga_buffer = (vga_attribute*)VGA_BUFFER_PADDR;
 
-vga_attribute theme_color = VGA_COLOR_BLACK;
+vga_attribute tty_theme_color = VGA_COLOR_BLACK;
 
 uint32_t tty_x = 0;
 uint16_t tty_y = 0;
 
+void tty_init(void* vga_buf) {
+    tty_vga_buffer = (vga_attribute*)vga_buf;
+    tty_clear();
+}
+
+void tty_set_buffer(void* vga_buf) {
+    tty_vga_buffer = (vga_attribute*)vga_buf;
+}
+
 void
 tty_set_theme(vga_attribute fg, vga_attribute bg)
 {
-    theme_color = (bg << 4 | fg) << 8;
+    tty_theme_color = (bg << 4 | fg) << 8;
 }
 
 void
@@ -27,11 +37,12 @@ tty_put_char(char chr)
             break;
         case '\n':
             tty_y++;
+            // fall through
         case '\r':
             tty_x = 0;
             break;
         default:
-            *(buffer + tty_x + tty_y * TTY_WIDTH) = (theme_color | chr);
+            *(tty_vga_buffer + tty_x + tty_y * TTY_WIDTH) = (tty_theme_color | chr);
             tty_x++;
             break;
     }
@@ -58,9 +69,9 @@ void
 tty_scroll_up()
 {
     size_t last_line = TTY_WIDTH * (TTY_HEIGHT - 1);
-    memcpy(buffer, buffer + TTY_WIDTH, last_line);
+    memcpy(tty_vga_buffer, tty_vga_buffer + TTY_WIDTH, last_line);
     for (size_t i = 0; i < TTY_WIDTH; i++) {
-        *(buffer + i + last_line) = theme_color;
+        *(tty_vga_buffer + i + last_line) = tty_theme_color;
     }
     tty_y = tty_y == 0 ? 0 : tty_y - 1;
 }
@@ -69,7 +80,7 @@ void
 tty_clear()
 {
     for (uint32_t i = 0; i < TTY_WIDTH * TTY_HEIGHT; i++) {
-        *(buffer + i) = theme_color;
+        *(tty_vga_buffer + i) = tty_theme_color;
     }
     tty_x = 0;
     tty_y = 0;