[BOOT] Print functions for debugging

kernel/include/debug.h

@@ -0,0 +1,31 @@
+#pragma once
+#include <string.h>
+
+#ifndef NDEBUG
+  #define debug(...) debug_printf(__VA_ARGS__)
+#else
+  #define debug(...) ((void)0)
+#endif
+#define debug_info(...) do{debug("[INFO] ");debug(__VA_ARGS__);}while(0)
+#define debug_ok(...) do{debug("[OK] ");debug(__VA_ARGS__);}while(0)
+#define debug_warning(...) do{debug("[WARNING] ");debug(__VA_ARGS__);}while(0)
+#define debug_error(...) do{debug("[ERROR] ");debug(__VA_ARGS__);}while(0)
+
+void debug_init();
+void debug_putch(char c);
+void debug_putsn(char *s, size_t n);
+void debug_puts(char *s);
+void debug_printf(char *, ...);
+
+char *_kernel_build_date;
+char *_kernel_build_time;
+
+char *_kernel_git_hash;
+char *_kernel_git_date;
+int kernel_git_dirty;
+char *_kernel_git_message;
+char *_kernel_git_branch;
+
+void debug_build_time();
+void debug_git_info();
+

kernel/include/ports.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <stdint.h>
+
+void outb(uint16_t port, uint8_t value);
+uint8_t inb(uint16_t port);
+
+void outw(uint16_t port, uint16_t value);
+uint16_t inw(uint16_t port);

kernel/include/serial.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <stdint.h>
+
+#define PORT_COM1 0x3F8
+#define PORT_COM2 0x2F8
+#define PORT_COM3 0x3E8
+#define PORT_COM4 0x2E8
+
+void serial_init(uint16_t port);
+void serial_write(uint16_t port, uint8_t c);

kernel/include/string.h

@@ -0,0 +1,13 @@
+#pragma once
+#include <stdint.h>
+#include <stddef.h>
+
+void *memcpy(void *dest, const void *src, size_t n);
+
+void *memset(void *s, int c, size_t n);
+
+void *memmove(void *dest, const void *src, size_t n);
+
+int memcmp(const void *s1, const void *s2, size_t n);
+
+size_t strlen(const char *s);

kernel/include/vga.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#define VGA_WIDTH 80
+#define VGA_LINES 25
+#define VGA_SIZE (VGA_WIDTH*VGA_LINES)
+
+void vga_init();
+void vga_printch(char c);