X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/e0ee3d449aacd33a84cb1f58961e55f9f06acb46..2803826a2373620dbfce8a5bff1e6a01dd594953:/lunaix-os/kernel/tty/tty.c

diff --git a/lunaix-os/kernel/tty/tty.c b/lunaix-os/kernel/tty/tty.c
index cb4f1b4..4164239 100644
--- a/lunaix-os/kernel/tty/tty.c
+++ b/lunaix-os/kernel/tty/tty.c
@@ -1,58 +1,156 @@
+#include <hal/io.h>
+#include <klibc/string.h>
+#include <lunaix/common.h>
 #include <lunaix/tty/tty.h>
 #include <stdint.h>
 
 #define TTY_WIDTH 80
 #define TTY_HEIGHT 25
 
-vga_atrributes *buffer = 0xB8000;
+static vga_attribute* tty_vga_buffer = (vga_attribute*)VGA_BUFFER_PADDR;
 
-vga_atrributes theme_color = VGA_COLOR_BLACK;
+static vga_attribute tty_theme_color = VGA_COLOR_BLACK;
 
-uint32_t TTY_COLUMN = 0;
-uint16_t TTY_ROW = 0;
+static uint32_t tty_x = 0;
+static uint32_t tty_y = 0;
 
-void tty_set_theme(vga_atrributes fg, vga_atrributes bg) {
-    theme_color = (bg << 4 | fg) << 8;
+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)
+{
+    tty_vga_buffer = (vga_attribute*)vga_buf;
+}
+
+void
+tty_set_theme(vga_attribute fg, vga_attribute bg)
+{
+    tty_theme_color = (bg << 4 | fg) << 8;
 }
 
-void tty_put_char(char chr) {
-    if (chr == '\n') {
-        TTY_COLUMN = 0;
-        TTY_ROW++;
+void
+tty_put_char(char chr)
+{
+    switch (chr) {
+        case '\t':
+            tty_x += 4;
+            break;
+        case '\n':
+            tty_y++;
+            // fall through
+        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_x++;
+            break;
     }
-    else if (chr == '\r') {
-        TTY_COLUMN = 0;
+
+    if (tty_x >= TTY_WIDTH) {
+        tty_x = 0;
+        tty_y++;
     }
-    else {
-        *(buffer + TTY_COLUMN + TTY_ROW * TTY_WIDTH) = (theme_color | chr);
-        TTY_COLUMN++;
-        if (TTY_COLUMN >= TTY_WIDTH) {
-            TTY_COLUMN = 0;
-            TTY_ROW++;
-        }
+    if (tty_y >= TTY_HEIGHT) {
+        tty_scroll_up();
     }
+}
 
-    if (TTY_ROW >= TTY_HEIGHT) {
-        tty_scroll_up();
-        TTY_ROW--;
-    } 
+void
+tty_sync_cursor()
+{
+    tty_set_cursor(tty_x, tty_y);
 }
 
-void tty_put_str(char* str) {
+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)
+{
     while (*str != '\0') {
         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
+tty_scroll_up()
+{
+    size_t last_line = TTY_WIDTH * (TTY_HEIGHT - 1);
+    memcpy(tty_vga_buffer, tty_vga_buffer + TTY_WIDTH, last_line * 2);
+    for (size_t i = 0; i < TTY_WIDTH; i++) {
+        *(tty_vga_buffer + i + last_line) = tty_theme_color;
+    }
+    tty_y = tty_y == 0 ? 0 : TTY_HEIGHT - 1;
 }
 
-void tty_scroll_up() {
-    // TODO use memcpy
+void
+tty_clear()
+{
+    for (uint32_t i = 0; i < TTY_WIDTH * TTY_HEIGHT; i++) {
+        *(tty_vga_buffer + i) = tty_theme_color;
+    }
+    tty_x = 0;
+    tty_y = 0;
 }
 
-void tty_clear() {
-    for (uint32_t x = 0; x < TTY_WIDTH; x++) {
-        for (uint32_t y = 0; y < TTY_HEIGHT; y++) {
-            *(buffer + x + y * TTY_WIDTH) = theme_color;
-        }
+void
+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_x = x % TTY_WIDTH;
+    tty_y = y % TTY_HEIGHT;
+}
+
+void
+tty_get_cpos(unsigned int* x, unsigned int* y)
+{
+    *x = tty_x;
+    *y = tty_y;
+}
+
+vga_attribute
+tty_get_theme()
+{
+    return tty_theme_color;
 }
\ No newline at end of file