Merge branch 'master' of github.com:Minep/lunaix-os

[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 e9aa42aba3fe09c713e2508baf2e7e0a07844726..41642390ecdd4c03e4231699010243e2a3d9dbc7 100644 (file)
--- a/lunaix-os/kernel/tty/tty.c
+++ b/lunaix-os/kernel/tty/tty.c
@@ -1,24 +1,35 @@
+#include <hal/io.h>
 #include <klibc/string.h>
+#include <lunaix/common.h>
 #include <lunaix/tty/tty.h>
-#include <lunaix/constants.h>
 #include <stdint.h>
 
 #define TTY_WIDTH 80
 #define TTY_HEIGHT 25
 
-vga_attribute* tty_vga_buffer = (vga_attribute*)VGA_BUFFER_PADDR;
+static vga_attribute* tty_vga_buffer = (vga_attribute*)VGA_BUFFER_PADDR;
 
-vga_attribute tty_theme_color = VGA_COLOR_BLACK;
+static vga_attribute tty_theme_color = VGA_COLOR_BLACK;
 
-uint32_t tty_x = 0;
-uint16_t tty_y = 0;
+static uint32_t tty_x = 0;
+static uint32_t tty_y = 0;
 
-void tty_init(void* vga_buf) {
+void
+tty_init(void* vga_buf)
+{
     tty_vga_buffer = (vga_attribute*)vga_buf;
     tty_clear();
+
+    io_outb(0x3D4, 0x0A);
+    io_outb(0x3D5, (io_inb(0x3D5) & 0xC0) | 13);
+
+    io_outb(0x3D4, 0x0B);
+    io_outb(0x3D5, (io_inb(0x3D5) & 0xE0) | 15);
 }
 
-void tty_set_buffer(void* vga_buf) {
+void
+tty_set_buffer(void* vga_buf)
+{
     tty_vga_buffer = (vga_attribute*)vga_buf;
 }
 
@@ -41,8 +52,14 @@ tty_put_char(char chr)
         case '\r':
             tty_x = 0;
             break;
+        case '\x08':
+            tty_x = tty_x ? tty_x - 1 : 0;
+            *(tty_vga_buffer + tty_x + tty_y * TTY_WIDTH) =
+              (tty_theme_color | 0x20);
+            break;
         default:
-            *(tty_vga_buffer + tty_x + tty_y * TTY_WIDTH) = (tty_theme_color | chr);
+            *(tty_vga_buffer + tty_x + tty_y * TTY_WIDTH) =
+              (tty_theme_color | chr);
             tty_x++;
             break;
     }
@@ -56,6 +73,25 @@ tty_put_char(char chr)
     }
 }
 
+void
+tty_sync_cursor()
+{
+    tty_set_cursor(tty_x, tty_y);
+}
+
+void
+tty_set_cursor(uint8_t x, uint8_t y)
+{
+    if (x >= TTY_WIDTH || y >= TTY_HEIGHT) {
+        x = y = 0;
+    }
+    uint32_t pos = y * TTY_WIDTH + x;
+    io_outb(0x3D4, 14);
+    io_outb(0x3D5, pos / 256);
+    io_outb(0x3D4, 15);
+    io_outb(0x3D5, pos % 256);
+}
+
 void
 tty_put_str(char* str)
 {
@@ -63,6 +99,11 @@ tty_put_str(char* str)
         tty_put_char(*str);
         str++;
     }
+    // FIXME: This does not work in user mode.
+    // Work around:
+    //  1. (Easy) Define an IO Permission bitmap in TSS
+    //  2. (More effort) Mount onto file system. (/dev/tty)
+    // tty_sync_cursor();
 }
 
 void
@@ -87,26 +128,29 @@ tty_clear()
 }
 
 void
-tty_clear_line(unsigned int y) {
-    for (size_t i = 0; i < TTY_WIDTH; i++)
-    {
+tty_clear_line(unsigned int y)
+{
+    for (size_t i = 0; i < TTY_WIDTH; i++) {
         *(tty_vga_buffer + i + y * TTY_WIDTH) = tty_theme_color;
     }
 }
 
 void
-tty_set_cpos(unsigned int x, unsigned int y) {
+tty_set_cpos(unsigned int x, unsigned int y)
+{
     tty_x = x % TTY_WIDTH;
     tty_y = y % TTY_HEIGHT;
 }
 
 void
-tty_get_cpos(unsigned int* x, unsigned int* y) {
+tty_get_cpos(unsigned int* x, unsigned int* y)
+{
     *x = tty_x;
     *y = tty_y;
 }
 
 vga_attribute
-tty_get_theme() {
+tty_get_theme()
+{
     return tty_theme_color;
 }
\ No newline at end of file