#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" enum{	Qdir,	Qboot,	Qmem,	Qkexec, 	Maxkexec = 1536*1024,}; static Dirtab bootdir[]={	".",			{Qdir, 0, QTDIR},	0,	0555,	"boot",		{Qboot},	0,	0220,	"mem",		{Qmem},		0,	0660,	"kexec",		{Qkexec},		0,	0220,}; static Chan*bootattach(char *spec){	return devattach('B', spec);} static Walkqid*bootwalk(Chan *c, Chan *nc, char **name, int nname){	return devwalk(c, nc, name, nname, bootdir, nelem(bootdir), devgen);} static intbootstat(Chan *c, uchar *dp, int n){	return devstat(c, dp, n, bootdir, nelem(bootdir), devgen);} static Chan*bootopen(Chan *c, int omode){	if (c->qid.path == Qkexec) {		c->aux = malloc(Maxkexec);		print("kexec buffer: %lux\n", c->aux);	}	return devopen(c, omode, bootdir, nelem(bootdir), devgen);} static void	 bootclose(Chan *c){	if(c->qid.path == Qkexec && c->aux != nil){		print("exec new kernel @%lux\n", (ulong)c->aux);		splhi();		segflush(c->aux, 64*1024);		gotopc((ulong)c->aux);	}} static long	 bootread(Chan *c, void *buf, long n, vlong offset){	switch((ulong)c->qid.path){ 	case Qdir:		return devdirread(c, buf, n, bootdir, nelem(bootdir), devgen); 	case Qmem:		/* kernel memory */		if(offset>=KZERO && offset<KZERO+conf.npage*BY2PG){			if(offset+n > KZERO+conf.npage*BY2PG)				n = KZERO+conf.npage*BY2PG - offset;			memmove(buf, (char*)offset, n);			return n;		}		error(Ebadarg);	} 	error(Egreg);	return 0;	/* not reached */} static long	 bootwrite(Chan *c, void *buf, long n, vlong offset){	ulong pc;	uchar *p; 	switch((ulong)c->qid.path){	case Qmem:		/* kernel memory */		if(offset>=KZERO && offset<KZERO+conf.npage*BY2PG){			if(offset+n > KZERO+conf.npage*BY2PG)				n = KZERO+conf.npage*BY2PG - offset;			memmove((char*)offset, buf, n);			segflush((void*)offset, n);			return n;		}		error(Ebadarg); 	case Qboot:		p = (uchar*)buf;		pc = (((((p[0]<<8)|p[1])<<8)|p[2])<<8)|p[3];		if(pc < KZERO || pc >= KZERO+conf.npage*BY2PG)			error(Ebadarg);		splhi();		segflush((void*)pc, 64*1024);		gotopc(pc); 	case Qkexec:		print(".");		if(c->aux != nil && offset <= Maxkexec){			if(offset+n > Maxkexec)				n = Maxkexec - offset;			memmove((char*)c->aux+offset, buf, n);			segflush((char*)c->aux+offset, n);			return n;		}		free(c->aux);		c->aux = nil;		error(Ebadarg);	}	error(Ebadarg);	return 0;	/* not reached */} Dev bootdevtab = {	'B',	"boot", 	devreset,	devinit,	devshutdown,	bootattach,	bootwalk,	bootstat,	bootopen,	devcreate,	bootclose,	bootread,	devbread,	bootwrite,	devbwrite,	devremove,	devwstat,};