/*  * 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. */ /* usb support */ #include <u.h>#include <libc.h>#include <auth.h>#include <fcall.h>#include "../boot/boot.h" #define PARTSRV "partfs.sdXX" enum {	Dontpost,	Post,}; int	debugboot; static char usbdisk0[] = "/dev/sdU0.0";static char sdxxctl[]  = "/dev/sdXX/ctl"; /* * run argv[0] (short name is name) and wait awhile for file to appear. * file must be generated by running argv[0]; if it already exists, we're done. */static intstart(char *name, char **argv, char *file){	int cnt; 	if(access(file, AEXIST) >= 0)		return 0;	if(access(argv[0], AEXIST) < 0) {		fprint(2, "no %s...", argv[0]);		return -1;	} 	if(debugboot)		fprint(2, "%s...", name);	runv(argv);	for(cnt = 10; cnt > 0 && access(file, AEXIST) < 0; cnt--)		sleep(100);	if (cnt <= 0) {		if(debugboot)			fprint(2, "no %s...", file);		return -1;	}	return 0;} intchmod(char *file, int mode){	Dir *dir; 	dir = dirstat(file);	if (dir == nil) {		if(debugboot)			fprint(2, "can't stat %s: %r\n", file);		return -1;	}	dir->mode &= ~0777;	dir->mode |= mode & 0777;	dirwstat("/srv/" PARTSRV, dir);	free(dir);	return 0;} /* start partfs on first usb disk, if any.  optionally post partfs in /srv. */static intstartpartfs(int post){	int r, i;	char *parts;	char *partfsv[32]; 	if(access(usbdisk0, AEXIST) < 0)		return -1;	/* can't run partfs until usbd is mounted */ 	if (post)		remove("/srv/" PARTSRV); 	i = 0;	partfsv[i++] = "/boot/partfs";	/*	 * hack for booting from usb: if /env/sdB0part (from 9load) exists,	 * pass it to partfs for sdXX.	 */	parts = getenv("sdB0part");	if (parts != nil) {		partfsv[i++] = "-p";		partfsv[i++] = parts;	}	if (post) {		partfsv[i++] = "-s";		partfsv[i++] = PARTSRV;	}	partfsv[i++] = usbdisk0;	partfsv[i] = nil;	r = start("partfs", partfsv, sdxxctl); 	if (post)		chmod("/srv/" PARTSRV, 0666);	return r;} static intmountusb(void){	int fd; 	if(debugboot)		fprint(2, "mount usbd...");	fd = open("/srv/usb", ORDWR);	if(fd < 0)		warning("can't open /srv/usb");	else if(mount(fd, -1, "/dev", MBEFORE, "") < 0) {		warning("mount -a /srv/usb /dev");		close(fd);	} else		return 0;		/* mount closed fd */	return -1;} intmountusbparts(void){	mountusb();	return startpartfs(Post);} /* *  start usbd, which mounts itself on /dev. *  start partfs on first disk, if any, to permit nvram on usb. */voidusbinit(int post){	int cnt;	static char *usbdv[] = { "/boot/usbd", nil }; 	if(access("#u/usb/ctl", AEXIST) < 0 || bind("#u", "/dev", MAFTER) < 0)		return;	if(debugboot)		fprint(2, "usbinit...");	start("usbd", usbdv, "/srv/usb"); 	/* allow a little time for usbd's device discovery */	for(cnt = 20; cnt > 0 && access(usbdisk0, AEXIST) < 0; cnt--)		sleep(100);	if(cnt > 0)		startpartfs(post);	else if(debugboot)		fprint(2, "no usb disk...");}