From a78033acc941fc4bcf6188f1d48fd8e012673fff Mon Sep 17 00:00:00 2001
From: EmulatedSeasons <89668582+EmulatedSeasons@users.noreply.github.com>
Date: Thu, 15 Jun 2023 22:36:39 -0400
Subject: initial commit

---
 kernel/arch/i386/tmtty.cpp | 76 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 kernel/arch/i386/tmtty.cpp

(limited to 'kernel/arch/i386/tmtty.cpp')

diff --git a/kernel/arch/i386/tmtty.cpp b/kernel/arch/i386/tmtty.cpp
new file mode 100644
index 0000000..06eb578
--- /dev/null
+++ b/kernel/arch/i386/tmtty.cpp
@@ -0,0 +1,76 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <arch/i386/tmtty.h>
+
+#include "vga.h"
+
+/* Text mode tty */
+
+static const size_t VGA_WIDTH = 80;
+static const size_t VGA_HEIGHT = 25;
+
+size_t terminal_row;
+size_t terminal_column;
+uint8_t terminal_color;
+uint16_t* terminal_buffer;
+
+void terminal_initialize(void) {
+    terminal_row = 0;
+    terminal_column = 0;
+    terminal_color = vga_entry_color(VGA_COLOR_WHITE, VGA_COLOR_BLACK);
+    terminal_buffer = (uint16_t*) 0xB8000;
+    for (size_t y = 0; y < VGA_HEIGHT; y++) {
+        for (size_t x = 0; x < VGA_WIDTH; x++) {
+            const size_t i = y * VGA_WIDTH + x;
+            terminal_buffer[i] = vga_entry(' ', terminal_color);
+        }
+    }
+}
+
+void terminal_clear(void) {
+    terminal_row = 0;
+    terminal_column = 0;
+    for (size_t y = 0; y < VGA_HEIGHT; y++) {
+        for (size_t x = 0; x < VGA_WIDTH; x++) {
+            const size_t i = y * VGA_WIDTH + x;
+            terminal_buffer[i] = vga_entry(' ', terminal_color);
+        }
+    }
+}
+
+void terminal_setcolor(uint8_t color) {
+    terminal_color = color;
+}
+
+void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
+    const size_t i = y * VGA_WIDTH + x;
+    terminal_buffer[i] = vga_entry(c, color);
+}
+
+void terminal_putchar(char c) {
+    if (c == '\n') {
+        terminal_column = 0;
+        ++terminal_row;
+        return;
+    }
+    terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
+    
+    if (++terminal_column == VGA_WIDTH) {
+        terminal_column = 0;
+        if (++terminal_row == VGA_HEIGHT) {
+            terminal_row = 0;
+        }
+    }
+}
+
+void terminal_write(const char* data, size_t size) {
+    for (size_t i = 0; i < size; i++) {
+        terminal_putchar(data[i]);
+    }
+}
+
+void terminal_writestring(const char* data) {
+    terminal_write(data, strlen(data));
+}
\ No newline at end of file
-- 
cgit v1.2.3-70-g09d2