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/kernel.c | 24 +++++++++++++++++++
 core/term.c   | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 core/vga.c    | 60 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 160 insertions(+)
 create mode 100644 core/kernel.c
 create mode 100644 core/term.c
 create mode 100644 core/vga.c

(limited to 'core')

diff --git a/core/kernel.c b/core/kernel.c
new file mode 100644
index 0000000..be9782d
--- /dev/null
+++ b/core/kernel.c
@@ -0,0 +1,24 @@
+/*
+ * 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/term.h>
+#include <garmos/types.h>
+
+void kernel_main(uint32_t multiboot, unsigned int *magicno)
+{
+	term_clear();
+	term_print("garmos 0.1.0\n\n");
+
+	while(1);
+}
diff --git a/core/term.c b/core/term.c
new file mode 100644
index 0000000..1f43591
--- /dev/null
+++ b/core/term.c
@@ -0,0 +1,76 @@
+/*
+ * 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/term.h>
+#include <garmos/types.h>
+#include <garmos/vga.h>
+
+struct term {
+	uint32_t row;
+	uint32_t col;
+};
+
+static struct term term = {
+	.row = 0,
+	.col = 0
+};
+
+#ifdef ENABLE_VGA
+
+void term_clear(void)
+{
+	vga_clear();
+}
+
+void term_put(char c)
+{
+	if (term.col + 1 >= VGA_COLS || c == '\n') {
+		term.col = 0;
+		term.row++;
+
+		if (term.row >= VGA_ROWS) {
+			/* TODO: scroll */
+			term.row = 0;
+		}
+	}
+
+	if (c != '\n') {
+		vga_print(term.row, term.col, c);
+		term.col++;
+	}
+}
+
+uint8_t term_enabled(void) {
+	return 1;
+}
+
+#else
+
+/* no supported output found! */
+
+void term_clear(void) {}
+
+void term_put(char c) {}
+
+uint8_t term_enabled(void) {
+	return 0;
+}
+
+#endif
+
+void term_print(char *s)
+{
+	for (; *s != '\0'; s++)
+		term_put(*s);
+}
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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