/*
* To facilitate booting from CDs, we create a partition for
* the boot floppy image embedded in a bootable CD.
*/
static int
part9660(SDunit *unit)
{
uint8_t buf[2048];
uint32_t a, n;
uint8_t *p;
if(unit->secsize != 2048)
return -1;
if(sdbio(unit, &unit->part[0], buf, 2048, 17*2048) < 0)
return -1;
if(buf[0] || strcmp((char*)buf+1, "CD001\x01EL TORITO SPECIFICATION") != 0)
return -1;
p = buf+0x47;
a = p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
if(sdbio(unit, &unit->part[0], buf, 2048, a*2048) < 0)
return -1;
if(memcmp(buf, "\x01\x00\x00\x00", 4) != 0
|| memcmp(buf+30, "\x55\xAA", 2) != 0
|| buf[0x20] != 0x88)
return -1;
p = buf+0x28;
a = p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
switch(buf[0x21]){
case 0x01:
n = 1200*1024;
break;
case 0x02:
n = 1440*1024;
break;
case 0x03:
n = 2880*1024;
break;
default:
return -1;
}
n /= 2048;
print("found partition %s!cdboot; %lud+%lud\n", unit->name, a, n);
sdaddpart(unit, "cdboot", a, a+n);
return 0;
}
long
sdread(Fs *vcrud, void *v, long n)
{
Scsicrud *crud;
long x;
crud = (Scsicrud*)vcrud;
x = sdbio(crud->unit, crud->part, v, n, crud->offset);
if(x > 0)
crud->offset += x;
return x;
}
int
tsdbio(SDunit *unit, SDpart *part, void *a, vlong off, int mbr)
{
uchar *b;
if(sdbio(unit, part, a, unit->secsize, off) != unit->secsize){
if(trace)
print("%s: read %lud at %lld failed\n", unit->name,
unit->secsize, (vlong)part->start*unit->secsize+off);
return -1;
}
b = a;
if(mbr && (b[0x1FE] != 0x55 || b[0x1FF] != 0xAA)){
if(trace)
print("%s: bad magic %.2ux %.2ux at %lld\n",
unit->name, b[0x1FE], b[0x1FF],
(vlong)part->start*unit->secsize+off);
return -1;
}
return 0;
}
static long
sdwrite(Chan* c, void* a, long n, vlong off)
{
char *f0;
int i;
uvlong end, start;
Cmdbuf *cb;
SDifc *ifc;
SDreq *req;
SDunit *unit;
SDev *sdev;
switch(TYPE(c->qid)){
default:
error(Eperm);
case Qtopctl:
cb = parsecmd(a, n);
if(waserror()){
free(cb);
nexterror();
}
if(cb->nf == 0)
error("empty control message");
f0 = cb->f[0];
cb->f++;
cb->nf--;
if(strcmp(f0, "config") == 0){
/* wormhole into ugly legacy interface */
legacytopctl(cb);
poperror();
free(cb);
break;
}
/*
* "ata arg..." invokes sdifc[i]->wtopctl(nil, cb),
* where sdifc[i]->name=="ata" and cb contains the args.
*/
ifc = nil;
sdev = nil;
for(i=0; sdifc[i]; i++){
if(strcmp(sdifc[i]->name, f0) == 0){
ifc = sdifc[i];
sdev = nil;
goto subtopctl;
}
}
/*
* "sd1 arg..." invokes sdifc[i]->wtopctl(sdev, cb),
* where sdifc[i] and sdev match controller letter "1",
* and cb contains the args.
*/
if(f0[0]=='s' && f0[1]=='d' && f0[2] && f0[3] == 0){
if((sdev = sdgetdev(f0[2])) != nil){
ifc = sdev->ifc;
goto subtopctl;
}
}
error("unknown interface");
subtopctl:
if(waserror()){
if(sdev)
decref(&sdev->r);
nexterror();
}
if(ifc->wtopctl)
ifc->wtopctl(sdev, cb);
else
error(Ebadctl);
poperror();
poperror();
if (sdev)
decref(&sdev->r);
free(cb);
break;
case Qctl:
cb = parsecmd(a, n);
sdev = sdgetdev(DEV(c->qid));
if(sdev == nil)
error(Enonexist);
unit = sdev->unit[UNIT(c->qid)];
qlock(&unit->ctl);
if(waserror()){
qunlock(&unit->ctl);
decref(&sdev->r);
free(cb);
nexterror();
}
if(unit->vers != c->qid.vers)
error(Echange);
if(cb->nf < 1)
error(Ebadctl);
if(strcmp(cb->f[0], "part") == 0){
if(cb->nf != 4)
error(Ebadctl);
if(unit->sectors == 0 && !sdinitpart(unit))
error(Eio);
start = strtoull(cb->f[2], 0, 0);
end = strtoull(cb->f[3], 0, 0);
sdaddpart(unit, cb->f[1], start, end);
}
else if(strcmp(cb->f[0], "delpart") == 0){
if(cb->nf != 2 || unit->part == nil)
error(Ebadctl);
sddelpart(unit, cb->f[1]);
}
else if(unit->dev->ifc->wctl)
unit->dev->ifc->wctl(unit, cb);
else
error(Ebadctl);
qunlock(&unit->ctl);
decref(&sdev->r);
poperror();
free(cb);
break;
case Qraw:
sdev = sdgetdev(DEV(c->qid));
if(sdev == nil)
error(Enonexist);
unit = sdev->unit[UNIT(c->qid)];
qlock(&unit->raw);
if(waserror()){
qunlock(&unit->raw);
decref(&sdev->r);
nexterror();
}
switch(unit->state){
case Rawcmd:
if(n < 6 || n > sizeof(req->cmd))
error(Ebadarg);
if((req = malloc(sizeof(SDreq))) == nil)
error(Enomem);
req->unit = unit;
memmove(req->cmd, a, n);
req->clen = n;
req->flags = SDnosense;
req->status = ~0;
unit->req = req;
unit->state = Rawdata;
break;
case Rawstatus:
unit->state = Rawcmd;
free(unit->req);
unit->req = nil;
error(Ebadusefd);
case Rawdata:
unit->state = Rawstatus;
unit->req->write = 1;
n = sdrio(unit->req, a, n);
}
qunlock(&unit->raw);
decref(&sdev->r);
poperror();
break;
case Qpart:
return sdbio(c, 1, a, n, off);
}
return n;
}
static long
sdread(Chan *c, void *a, long n, vlong off)
{
char *p, *e, *buf;
SDpart *pp;
SDunit *unit;
SDev *sdev;
ulong offset;
int i, l, m, status;
offset = off;
switch(TYPE(c->qid)){
default:
error(Eperm);
case Qtopctl:
m = 64*1024; /* room for register dumps */
p = buf = malloc(m);
if(p == nil)
error(Enomem);
e = p + m;
qlock(&devslock);
for(i = 0; i < nelem(devs); i++){
sdev = devs[i];
if(sdev && sdev->ifc->rtopctl)
p = sdev->ifc->rtopctl(sdev, p, e);
}
qunlock(&devslock);
n = readstr(off, a, n, buf);
free(buf);
return n;
case Qtopdir:
case Qunitdir:
return devdirread(c, a, n, 0, 0, sdgen);
case Qctl:
sdev = sdgetdev(DEV(c->qid));
if(sdev == nil)
error(Enonexist);
unit = sdev->unit[UNIT(c->qid)];
m = 16*1024; /* room for register dumps */
p = malloc(m);
if(p == nil)
error(Enomem);
l = snprint(p, m, "inquiry %.48s\n",
(char*)unit->inquiry+8);
qlock(&unit->ctl);
/*
* If there's a device specific routine it must
* provide all information pertaining to night geometry
* and the garscadden trains.
*/
if(unit->dev->ifc->rctl)
l += unit->dev->ifc->rctl(unit, p+l, m-l);
if(unit->sectors == 0)
sdinitpart(unit);
if(unit->sectors){
if(unit->dev->ifc->rctl == nil)
l += snprint(p+l, m-l,
"geometry %llud %lud\n",
unit->sectors, unit->secsize);
pp = unit->part;
for(i = 0; i < unit->npart; i++){
if(pp->valid)
l += snprint(p+l, m-l,
"part %s %llud %llud\n",
pp->name, pp->start, pp->end);
pp++;
}
}
qunlock(&unit->ctl);
decref(&sdev->r);
l = readstr(offset, a, n, p);
free(p);
return l;
case Qraw:
sdev = sdgetdev(DEV(c->qid));
if(sdev == nil)
error(Enonexist);
unit = sdev->unit[UNIT(c->qid)];
qlock(&unit->raw);
if(waserror()){
qunlock(&unit->raw);
decref(&sdev->r);
nexterror();
}
if(unit->state == Rawdata){
unit->state = Rawstatus;
i = sdrio(unit->req, a, n);
}
else if(unit->state == Rawstatus){
status = unit->req->status;
unit->state = Rawcmd;
free(unit->req);
unit->req = nil;
i = readnum(0, a, n, status, NUMSIZE);
} else
i = 0;
qunlock(&unit->raw);
decref(&sdev->r);
poperror();
return i;
case Qpart:
return sdbio(c, 0, a, n, off);
}
}