Subversion Repositories planix.SVN

#include "u.h"

#include "../port/lib.h"

#include "mem.h"

#include "dat.h"

#include "fns.h"

#include "../port/error.h"

#include "io.h"

#include "../ip/ip.h"

enum {

	Qdir = 0,

	Qbase,

	Qmax = 16,

};

typedef long Rdwrfn(Chan*, void*, long, vlong);

static Rdwrfn *readfn[Qmax];

static Rdwrfn *writefn[Qmax];

static Dirtab archdir[Qmax] = {

	".",		{ Qdir, 0, QTDIR },	0,	0555,

};

Lock archwlock;	/* the lock is only for changing archdir */

int narchdir = Qbase;

/*

 * Add a file to the #P listing.  Once added, you can't delete it.

 * You can't add a file with the same name as one already there,

 * and you get a pointer to the Dirtab entry so you can do things

 * like change the Qid version.  Changing the Qid path is disallowed.

 */

Dirtab*

addarchfile(char *name, int perm, Rdwrfn *rdfn, Rdwrfn *wrfn)

{

	int i;

	Dirtab d;

	Dirtab *dp;

	memset(&d, 0, sizeof d);

	strcpy(d.name, name);

	d.perm = perm;

	lock(&archwlock);

	if(narchdir >= Qmax){

		unlock(&archwlock);

		return nil;

	}

	for(i=0; i<narchdir; i++)

		if(strcmp(archdir[i].name, name) == 0){

			unlock(&archwlock);

			return nil;

		}

	d.qid.path = narchdir;

	archdir[narchdir] = d;

	readfn[narchdir] = rdfn;

	writefn[narchdir] = wrfn;

	dp = &archdir[narchdir++];

	unlock(&archwlock);

	return dp;

}

static Chan*

archattach(char* spec)

{

	return devattach('P', spec);

}

Walkqid*

archwalk(Chan* c, Chan *nc, char** name, int nname)

{

	return devwalk(c, nc, name, nname, archdir, narchdir, devgen);

}

static int

archstat(Chan* c, uchar* dp, int n)

{

	return devstat(c, dp, n, archdir, narchdir, devgen);

}

static Chan*

archopen(Chan* c, int omode)

{

	return devopen(c, omode, archdir, narchdir, devgen);

}

static void

archclose(Chan*)

{

}

static long

archread(Chan *c, void *a, long n, vlong offset)

{

	Rdwrfn *fn;

	switch((ulong)c->qid.path){

	case Qdir:

		return devdirread(c, a, n, archdir, narchdir, devgen);

	default:

		if(c->qid.path < narchdir && (fn = readfn[c->qid.path]))

			return fn(c, a, n, offset);

		error(Eperm);

		break;

	}

	return 0;

}

static long

archwrite(Chan *c, void *a, long n, vlong offset)

{

	Rdwrfn *fn;

	if(c->qid.path < narchdir && (fn = writefn[c->qid.path]))

		return fn(c, a, n, offset);

	error(Eperm);

	return 0;

}

void archinit(void);

Dev archdevtab = {

	'P',

	"arch",

	devreset,

	archinit,

	devshutdown,

	archattach,

	archwalk,

	archstat,

	archopen,

	devcreate,

	archclose,

	archread,

	devbread,

	archwrite,

	devbwrite,

	devremove,

	devwstat,

};

static long

cputyperead(Chan*, void *a, long n, vlong offset)

{

	char name[64], str[128];

	cputype2name(name, sizeof name);

	snprint(str, sizeof str, "ARM %s %llud\n", name, m->cpuhz / Mhz);

	return readstr(offset, a, n, str);

}

static long

tbread(Chan*, void *a, long n, vlong offset)

{

	char str[16];

	uvlong tb;

	cycles(&tb);

	snprint(str, sizeof(str), "%16.16llux", tb);

	return readstr(offset, a, n, str);

}

static long

nsread(Chan*, void *a, long n, vlong offset)

{

	char str[16];

	uvlong tb;

	cycles(&tb);

	snprint(str, sizeof(str), "%16.16llux", (tb/700)* 1000);

	return readstr(offset, a, n, str);

}

void

archinit(void)

{

	addarchfile("cputype", 0444, cputyperead, nil);

	addarchfile("timebase",0444, tbread, nil);

//	addarchfile("nsec", 0444, nsread, nil);

}