// IO Port	Access Type	Purpose
// 0x60	Read/Write	Data Port
// 0x64	Read	Status Register
// 0x64	Write	Command Register

enum{
	CON_PC,
	CON_SRI,
	CON_END,
};

struct BIOSreg{
	u32 ax; 
	u32 cx; 
	u32 dx; 
	u32 bx; 
	u32 bp; 
	u32 si; 
	u32 di; 
	u32 ds; 
	u32 es; 
}__attribute__((packed));

typedef struct{
	char *name;
	void (**probes)(void);
	uint cnt;
}BootProbe;

typedef struct ConDev ConDev;
struct ConDev{
	int (*probe)(ConDev*);
	void (*init)(ConDev *);
	int (*getc)(int);
	void (*putc)(int, int);
	uint dev;
	uchar pri; // the higher the better
};

// gdt.S
extern volatile struct BIOSreg BIOSreg;

// boot.c
extern void (*probe1[])(void);
extern void (*probe2[])(void);
extern BootProbe probes[];
extern ConDev contab[CON_END];
extern ConDev *con;