Add initial barebones kernel and cross compiler container image

2024-07-29 23:59:10 +02:00
commit 30e0d6d9f8
19 changed files with 899 additions and 0 deletions
--- a/src/include/tty.h
+++ b/src/include/tty.h
@@ -0,0 +1,57 @@
+/*
+ * Inspired by OSDev - Bare Bones
+ * 	URL: 	 https://wiki.osdev.org/Bare_Bones#Writing_a_kernel_in_C
+ *	Archive: https://web.archive.org/web/20240718110628/https://wiki.osdev.org/Bare_Bones#Writing_a_kernel_in_C
+ *	Date:	 2024-07-29
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include "str.h"
+
+static constexpr size_t VGA_WIDTH = 80;
+static constexpr size_t VGA_HEIGHT = 25;
+
+static uint16_t* const terminal_buf = (uint16_t*)0xB8000;
+
+struct [[nodiscard]] terminal_state {
+    size_t          row;
+    size_t          column;
+    uint8_t         color;
+    uint16_t* const buf;
+};
+
+/* Hardware text mode color constants. */
+enum vga_color : uint8_t {
+	VGA_COLOR_BLACK         = 0,
+	VGA_COLOR_BLUE          = 1,
+	VGA_COLOR_GREEN         = 2,
+	VGA_COLOR_CYAN          = 3,
+	VGA_COLOR_RED           = 4,
+	VGA_COLOR_MAGENTA       = 5,
+	VGA_COLOR_BROWN         = 6,
+	VGA_COLOR_LIGHT_GREY    = 7,
+	VGA_COLOR_DARK_GREY     = 8,
+	VGA_COLOR_LIGHT_BLUE    = 9,
+	VGA_COLOR_LIGHT_GREEN   = 10,
+	VGA_COLOR_LIGHT_CYAN    = 11,
+	VGA_COLOR_LIGHT_RED     = 12,
+	VGA_COLOR_LIGHT_MAGENTA = 13,
+	VGA_COLOR_LIGHT_BROWN   = 14,
+	VGA_COLOR_WHITE         = 15,
+};
+
+#define vga_color(fg, bg) (fg | bg << 4)
+
+void terminal_clear();
+
+void terminal_set_color(uint8_t fg, uint8_t bg);
+
+void terminal_putentryat(char c, uint8_t color, size_t x, size_t y);
+
+void terminal_scroll(int n);
+
+void terminal_putchar(int c);
+
+void terminal_write(struct str str);