Got basic tty driver & implemented Stack Smash Protector

kernel/include/kernel.h

@@ -1,6 +1,33 @@
 #ifndef _KERNEL_H
 #define _KERNEL_H
 
+// Null definition
+#define NULL	((void*)0)
+
+/*
+ * Variable arguments
+ */
+typedef void* va_list;
+#define va_start(ap, param) (void)((ap) = (char*)(&(param) + 1))
+#define va_end(ap) (void)((ap) = 0)
+#define va_arg(ap, type) (((type*)((ap) = ((ap) + sizeof(type))))[-1])
+
+/*
+ * Utility macros
+ */
+#define ARRAY_SIZE(_a)	(sizeof((_a)) / sizeof((_a)[0]))
+#define BIT(_n)		(1UL << (_n))
+#define BIT_MASK(_n)	(BIT(_n) - 1)
+#define ALIGN(_x, _a)	__ALIGN_MASK((_x), (typeof(_x))(_a) - 1)
+#define __ALIGN_MASK(_x, _m) (((_x) + (_m)) & ~(_m))
+#define container_of(_p, _t, _m) \
+	((_t*)((char*)(_p) - offsetof(_t, _m)))
+#define swap(_a, _b)	({ typeof(_a) _tmp = (_a); (_a) = (_b); (_b) = (_a); })
+#define min(_x, _y)	({ typeof(_x) __x = (_x); typeof(_y) __y = (_y); __x < __y ? __x : __y; })
+#define max(_x, _y)	({ typeof(_x) __x = (_x); typeof(_y) __y = (_y); __x > __y ? __x : __y; })
+#define ceil(_x, _y)	((((_x) + (_y)) (_y)) * (_y))
+#define floor(_x, _y)	((_x) - ((_x) % (_y)))
+
 /*
  * Attribute definitions
  */ 
@@ -20,18 +47,29 @@
 /*
  * Standard int types
  */
-// Unsigned
 typedef unsigned char	uint8_t;
 typedef unsigned short	uint16_t;
 typedef unsigned int	uint32_t;
 typedef unsigned long	uint64_t;
-// Signed
 typedef signed char	int8_t;
 typedef signed short	int16_t;
 typedef signed int	int32_t;
 typedef signed long	int64_t;
-// Size
 typedef uint32_t	size_t;
 typedef int32_t		ssize_t;
+typedef uint32_t	uintptr_t;
+typedef int32_t		intptr_t;
+
+/*
+ * Logging and errors
+ */
+// TODO: Logging with printk()
+// TODO: Log levels & pr_*() wrappers for printk()
+#define BUG()		(panic("BUG()"))
+#define WARN()		NULL
+#define BUG_ON(_e)	((_e) ? BUG() : NULL)
+#define WARN_ON(_e)	((_e) ? WARN() : NULL)
+// TODO: Write a panic()
+#define panic(_s)	while(1);
 
 #endif

kernel/include/tty.h

@@ -2,13 +2,15 @@
 #define _TTY_H
 
 /* VGA Text mode */
+#define VGA_ATTR(_fg, _bg)	((_fg) | ((_bg) << 4)
 #define VGA_WIDTH	80
 #define VGA_HEIGHT	25
 #define VGA_MEMORY	0xb8000
 
-int tty_init(void);
-int tty_write(char* buf, size_t len);
-int tty_putc(char c);
-int tty_puts(char* s);
+void tty_init(void);
+void tty_clear(void);
+void tty_setattr(uint8_t attr);
+void tty_putc(char c);
+void tty_puts(char* s);
 
 #endif