Cleanup

src/kernel.cpp

@@ -0,0 +1,92 @@
+void k_print_line(const char* string);
+void k_print(const char* string);
+
+#include "addresses.hpp"
+
+typedef unsigned int uint8_t __attribute__((__mode__(__QI__)));
+typedef unsigned int uint16_t __attribute__ ((__mode__ (__HI__)));
+
+uint8_t in_byte(uint16_t _port){
+    uint8_t rv;
+    __asm__ __volatile__ ("in %0, %1" : "=a" (rv) : "dN" (_port));
+    return rv;
+}
+
+void out_byte (uint16_t _port, uint8_t _data){
+    __asm__ __volatile__ ("out %0, %1" : : "dN" (_port), "a" (_data));
+}
+
+template<int IRQ>
+void register_irq_handler(void (*handler)()){
+    asm ("mov r8, %0; mov r9, %1; call %2"
+        :
+        : "i" (IRQ), "i" (&handler), "i" (asm_register_irq_handler)
+        : "r8", "r9"
+        );
+}
+
+void keyboard_handler(){
+    in_byte(0x60);
+
+    k_print("key");
+}
+
+extern "C"
+void  __attribute__ ((section ("main_section"))) kernel_main(){
+    k_print("thor> ");
+
+    register_irq_handler<1>(keyboard_handler);
+
+    return;
+}
+
+long current_line = 0;
+long current_column = 0;
+
+enum vga_color {
+    BLACK = 0,
+    BLUE = 1,
+    GREEN = 2,
+    CYAN = 3,
+    RED = 4,
+    MAGENTA = 5,
+    BROWN = 6,
+    LIGHT_GREY = 7,
+    DARK_GREY = 8,
+    LIGHT_BLUE = 9,
+    LIGHT_GREEN = 10,
+    LIGHT_CYAN = 11,
+    LIGHT_RED = 12,
+    LIGHT_MAGENTA = 13,
+    LIGHT_BROWN = 14,
+    WHITE = 15,
+};
+
+uint8_t make_color(vga_color fg, vga_color bg){
+    return fg | bg << 4;
+}
+
+uint16_t make_vga_entry(char c, uint8_t color){
+    uint16_t c16 = c;
+    uint16_t color16 = color;
+    return c16 | color16 << 8;
+}
+
+void k_print_line(const char* string){
+    k_print(string);
+
+    current_column = 0;
+    ++current_line;
+}
+
+void k_print(const char* string){
+    uint16_t* vga_buffer = (uint16_t*) 0x0B8000;
+
+    for(int i = 0; string[i] != 0; ++i){
+        vga_buffer[current_line * 80 + current_column] = make_vga_entry(string[i], make_color(WHITE, BLACK));
+
+        ++current_column;
+    }
+
+    return;
+}