From d42b629d983de336ddd3c22782caa2791ab78897 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Sun, 5 Mar 2017 21:43:19 +0100
Subject: initial commit

---
 core/vga.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 core/vga.c

(limited to 'core/vga.c')

diff --git a/core/vga.c b/core/vga.c
new file mode 100644
index 0000000..fc1982c
--- /dev/null
+++ b/core/vga.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2017 Robin Krahl <robin.krahl@ireas.org>
+ * 
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <garmos/arch.h>
+#include <garmos/types.h>
+#include <garmos/vga.h>
+
+#ifndef VGA_MEMORY
+#define VGA_MEMORY 0xB8000
+#endif
+
+void vga_clear(void)
+{
+	uint32_t i;
+
+	for (i = 0; i < VGA_ROWS * VGA_COLS; i += 2)
+		regset8(VGA_MEMORY + i, 0);
+}
+
+void vga_pclear(uint8_t attr)
+{
+	uint32_t i;
+
+	for (i = 0; i < VGA_ROWS * VGA_COLS; i += 2) {
+		regset8(VGA_MEMORY + i, 0);
+		regset8(VGA_MEMORY + i + 1, attr);
+	}
+}
+
+void vga_print(uint32_t row, uint32_t col, uint8_t c)
+{
+	uint32_t i = 2 * (row * VGA_COLS + col);
+
+	if (row >= VGA_ROWS || col >= VGA_COLS)
+		return;
+
+	regset8(VGA_MEMORY + i, c);
+}
+
+void vga_pprint(uint32_t row, uint32_t col, uint8_t attr, uint8_t c)
+{
+	uint32_t i = 2 * (row * VGA_COLS + col);
+
+	if (row >= VGA_ROWS || col >= VGA_COLS)
+		return;
+
+	regset8(VGA_MEMORY + i, c);
+	regset8(VGA_MEMORY + i + 1, attr);
+}
-- 
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