typedef uvlong Devbytes, Devsects; typedef struct Biosdrive Biosdrive;	/* 1 drive -> ndevs */typedef struct Biosdev Biosdev; struct Biosdrive {	int	ndevs;};struct Biosdev {	Devbytes size;	Devbytes offset;	uchar	id;	char	type;}; int	biosboot(int dev, char *file, Boot *b);void*	biosgetfspart(int i, char *name, int chatty);void	biosinitdev(int i, char *name);int	biosinit(void);void	biosprintbootdevs(int dev);void	biosprintdevs(int i);long	biosread(Fs *fs, void *a, long n);