first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/include/usb/usbfs.h

@@ -0,0 +1,70 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+typedef struct Usbfs Usbfs;
+typedef struct Fid Fid;
+
+enum
+{
+	Hdrsize	= 128,		/* plenty of room for headers */
+	Msgsize	= 8216,		/* our preferred iounit (also devmnt's) */
+	Bufsize	= Hdrsize + Msgsize,
+	Namesz = 40,
+	Errmax = 128,
+	ONONE = ~0,		/* omode in Fid when not open */
+};
+
+struct Fid
+{
+	int	fid;
+	Qid	qid;
+	int	omode;
+	Fid*	next;
+	void*	aux;
+};
+
+struct Usbfs
+{
+	char	name[Namesz];
+	uint64_t	qid;
+	Dev*	dev;
+	void*	aux;
+
+	int	(*walk)(Usbfs *fs, Fid *f, char *name);
+	void	(*clone)(Usbfs *fs, Fid *of, Fid *nf);
+	void	(*clunk)(Usbfs *fs, Fid *f);
+	int	(*open)(Usbfs *fs, Fid *f, int mode);
+	int32_t	(*read)(Usbfs *fs, Fid *f, void *data, int32_t count, int64_t offset);
+	int32_t	(*write)(Usbfs *fs, Fid*f, void *data, int32_t count, int64_t offset);
+	int	(*stat)(Usbfs *fs, Qid q, Dir *d);
+	void	(*end)(Usbfs *fs);
+};
+
+typedef int (*Dirgen)(Usbfs*, Qid, int, Dir*, void*);
+
+int32_t	usbreadbuf(void *data, int32_t count, int64_t offset, void *buf, int32_t n);
+void	usbfsadd(Usbfs *dfs);
+void	usbfsdel(Usbfs *dfs);
+int	usbdirread(Usbfs*f, Qid q, char *data, int32_t cnt, int64_t off, Dirgen gen, void *arg);
+void	usbfsinit(char* srv, char *mnt, Usbfs *f, int flag);
+
+void	usbfsdirdump(void);
+
+extern char Enotfound[];
+extern char Etoosmall[];
+extern char Eio[];
+extern char Eperm[];
+extern char Ebadcall[];
+extern char Ebadfid[];
+extern char Einuse[];
+extern char Eisopen[];
+extern char Ebadctl[];
+
+extern Usbfs usbdirfs;
+extern int usbfsdebug;