int
mpintrenable(Vctl* v)
{
int irq, tbdf, vno;
/*
* If the bus is known, try it.
* BUSUNKNOWN is given both by [E]ISA devices and by
* interrupts local to the processor (local APIC, coprocessor
* breakpoint and page-fault).
*/
tbdf = v->tbdf;
if(tbdf != BUSUNKNOWN && (vno = mpintrenablex(v, tbdf)) != -1)
return vno;
irq = v->irq;
if(irq >= IrqLINT0 && irq <= MaxIrqLAPIC){
if(irq != IrqSPURIOUS)
v->isr = lapiceoi;
return VectorPIC+irq;
}
if(irq < 0 || irq > MaxIrqPIC){
print("mpintrenable: irq %d out of range\n", irq);
return -1;
}
/*
* Either didn't find it or have to try the default buses
* (ISA and EISA). This hack is due to either over-zealousness
* or laziness on the part of some manufacturers.
*
* The MP configuration table on some older systems
* (e.g. ASUS PCI/E-P54NP4) has an entry for the EISA bus
* but none for ISA. It also has the interrupt type and
* polarity set to 'default for this bus' which wouldn't
* be compatible with ISA.
*/
if(mpeisabus != -1){
vno = mpintrenablex(v, MKBUS(BusEISA, 0, 0, 0));
if(vno != -1)
return vno;
}
if(mpisabus != -1){
vno = mpintrenablex(v, MKBUS(BusISA, 0, 0, 0));
if(vno != -1)
return vno;
}
print("mpintrenable: out of choices eisa %d isa %d tbdf %#ux irq %d\n",
mpeisabus, mpisabus, v->tbdf, v->irq);
return -1;
}
static int32_t
irqmapwrite(Chan* c, void *buf, int32_t n, int64_t offset)
{
int acpiirq(uint32_t tbdf, int irq);
int t, b, d, f, irq;
int *p[] = {&t, &b, &d, &f, &irq};
Cmdbuf *cb;
cb = parsecmd(buf, n);
if (cb->nf < nelem(p))
error("iprqmapwrite t b d f irq");
for(int i = 0; i < nelem(p); i++)
*p[i] = strtoul(cb->f[i], 0, 0);
acpiirq(MKBUS(t, b, d, f), irq);
return -1;
}
static int32_t
acpiwrite(Chan *c, void *a, int32_t n, int64_t off)
{
Mach *m = machp();
Cmdtab *ct;
Cmdbuf *cb;
Reg *r;
uint rno, fun, dev, bus, i;
if(c->qid.path == Qio){
if(reg == nil)
error("region not configured");
return regio(reg, a, n, off, 1);
}
if(c->qid.path != Qctl)
error(Eperm);
cb = parsecmd(a, n);
if(waserror()){
free(cb);
nexterror();
}
ct = lookupcmd(cb, ctls, nelem(ctls));
DBG("acpi ctl %s\n", cb->f[0]);
switch(ct->index){
case CMregion:
r = reg;
if(r == nil){
r = smalloc(sizeof(Reg));
r->name = nil;
}
kstrdup(&r->name, cb->f[1]);
r->spc = acpiregid(cb->f[2]);
if(r->spc < 0){
free(r);
reg = nil;
error("bad region type");
}
if(r->spc == Rpcicfg || r->spc == Rpcibar){
rno = r->base>>Rpciregshift & Rpciregmask;
fun = r->base>>Rpcifunshift & Rpcifunmask;
dev = r->base>>Rpcidevshift & Rpcidevmask;
bus = r->base>>Rpcibusshift & Rpcibusmask;
r->tbdf = MKBUS(BusPCI, bus, dev, fun);
r->base = rno; /* register ~ our base addr */
}
r->base = strtoull(cb->f[3], nil, 0);
r->len = strtoull(cb->f[4], nil, 0);
r->accsz = strtoul(cb->f[5], nil, 0);
if(r->accsz < 1 || r->accsz > 4){
free(r);
reg = nil;
error("bad region access size");
}
reg = r;
DBG("region %s %s %llux %llux sz%d",
r->name, acpiregstr(r->spc), r->base, r->len, r->accsz);
break;
case CMgpe:
i = strtoul(cb->f[1], nil, 0);
if(i >= ngpes)
error("gpe out of range");
kstrdup(&gpes[i].obj, cb->f[2]);
DBG("gpe %d %s\n", i, gpes[i].obj);
setgpeen(i, 1);
break;
default:
panic("acpi: unknown ctl");
}
static int
pcilscan(int bno, char *path, Pcidev** list)
{
Pcidev *p, *head, *tail;
int dno, fno, i, hdt, l, maxfno, maxubn, sbn, tbdf, ubn, capoff;
maxubn = bno;
head = nil;
tail = nil;
for(dno = 0; dno <= Maxdev; dno++){
maxfno = 0;
for(fno = 0; fno <= maxfno; fno++){
/*
* For this possible device, form the
* bus+device+function triplet needed to address it
* and try to read the vendor and device ID.
* If successful, allocate a device struct and
* start to fill it in with some useful information
* from the device's configuration space.
*/
tbdf = MKBUS(BusPCI, bno, dno, fno);
l = pcicfgrw(tbdf, PciVID, 0, Read, 4);
if(l == 0xFFFFFFFF || l == 0)
continue;
p = malloc(sizeof(*p));
p->caplist = nil;
p->capidx = nil;
p->capcnt = 0;
p->tbdf = tbdf;
p->vid = l;
p->did = l>>16;
p->path = path;
if(pcilist != nil)
pcitail->list = p;
else
pcilist = p;
pcitail = p;
p->pcr = pcicfgr16(p, PciPCR);
p->rid = pcicfgr8(p, PciRID);
p->ccrp = pcicfgr8(p, PciCCRp);
p->ccru = pcicfgr8(p, PciCCRu);
p->ccrb = pcicfgr8(p, PciCCRb);
p->cls = pcicfgr8(p, PciCLS);
p->ltr = pcicfgr8(p, PciLTR);
p->intl = pcicfgr8(p, PciINTL);
p->intp = pcicfgr8(p, PciINTP);
/*
* If the device is a multi-function device adjust the
* loop count so all possible functions are checked.
*/
hdt = pcicfgr8(p, PciHDT);
if(hdt & 0x80)
maxfno = Maxfn;
/*
* If appropriate, read the base address registers
* and work out the sizes.
*/
switch(p->ccrb) {
default:
if((hdt & 0x7F) != 0)
break;
for(i = 0; i < nelem(p->mem); i++) {
p->mem[i].bar = pcicfgr32(p, PciBAR0+4*i);
p->mem[i].size = pcibarsize(p, PciBAR0+4*i);
}
break;
/*
* Some virtio-pci devices have ccrb == 0x00, their BARs and
* sizes also should be picked here.
*/
case 0x05: /* memory controller */
case 0x06: /* bridge device */
break;
}
/*
* Try to gather PCI capabilities. If the offset of capabilities
* in the config area cannot be found, skip this step. For simplicity,
* capabilities will be linked in a LIFO so we don't deal with list
* heads and tails.
*/
capoff = pcicapoff(p);
int off = capoff;
while(capoff != -1) {
off = pcicfgr8(p, off);
if((off < 0x40) || (off & 3))
break;
off &= ~3;
Pcicap *c = malloc(sizeof(*c));
c->dev = p;
c->link = p->caplist;
p->caplist = c;
p->capcnt++;
c->vndr = pcicfgr8(p, off + PciCapVndr);
c->caplen = pcicfgr8(p, off + PciCapLen);
c->type = pcicfgr8(p, off + PciCapType);
c->bar = pcicfgr8(p, off + PciCapBar);
c->offset = pcicfgr32(p, off + PciCapOff);
c->length = pcicfgr32(p, off + PciCapLength);
off++;
}
if(p->capcnt > 0) {
p->capidx = malloc(p->capcnt * sizeof(Pcicap *));
Pcicap *pcp = p->caplist;
for(int pix = 0; ; pix++) {
p->capidx[pix] = pcp;
pcp = pcp->link;
if(pcp == nil)
break;
}
}
if(head != nil)
tail->link = p;
else
head = p;
tail = p;
}
}
*list = head;
for(p = head; p != nil; p = p->link) {
/*
* Find PCI-PCI bridges and recursively descend the tree.
*/
if(p->ccrb != 0x06 || p->ccru != 0x04)
continue;
/*
* If the secondary or subordinate bus number is not
* initialised try to do what the PCI BIOS should have
* done and fill in the numbers as the tree is descended.
* On the way down the subordinate bus number is set to
* the maximum as it's not known how many buses are behind
* this one; the final value is set on the way back up.
*/
sbn = pcicfgr8(p, PciSBN);
ubn = pcicfgr8(p, PciUBN);
if(sbn == 0 || ubn == 0) {
print("%T: unconfigured bridge\n", p->tbdf);
sbn = maxubn+1;
/*
* Make sure memory, I/O and master enables are
* off, set the primary, secondary and subordinate
* bus numbers and clear the secondary status before
* attempting to scan the secondary bus.
*
* Initialisation of the bridge should be done here.
*/
pcicfgw32(p, PciPCR, 0xFFFF0000);
pcicfgw32(p, PciPBN, Maxbus<<16 | sbn<<8 | bno);
pcicfgw16(p, PciSPSR, 0xFFFF);
char *bus = mallocz(256, 1);
snprint(bus, 256, "%s/%d.%d.0", path, BUSBNO(p->tbdf), BUSDNO(p->tbdf));
maxubn = pcilscan(sbn, bus, &p->bridge);
pcicfgw32(p, PciPBN, maxubn<<16 | sbn<<8 | bno);
}
else {
/*
* You can't go back.
* This shouldn't be possible, but the
* Iwill DK8-HTX seems to have subordinate
* bus numbers which get smaller on the
* way down. Need to look more closely at
* this.
*/
if(ubn > maxubn) {
maxubn = ubn;
}
char *bus = mallocz(256, 1);
snprint(bus, 256, "%s/%d.%d.0", path, BUSBNO(p->tbdf), BUSDNO(p->tbdf));
pcilscan(sbn, bus, &p->bridge);
}
}
return maxubn;
}
static void
pcicfginit(void)
{
int fd, i, j, n, bno, dno, fno;
char buf[1024], *base, *s;
Pcidev *p;
Dir *d;
trace("pcicfginit\n");
if((fd = open(base = "/dev/pci", OREAD)) < 0)
if((fd = open(base = "#$/pci", OREAD)) < 0)
return;
n = dirreadall(fd, &d);
close(fd);
for(i=0; i<n; i++) {
if(strstr(d[i].name, "ctl") == nil)
continue;
strncpy(buf, d[i].name, sizeof(buf));
bno = strtoul(buf, &s, 10);
dno = strtoul(s+1, &s, 10);
fno = strtoul(s+1, nil, 10);
p = mallocz(sizeof(*p), 1);
p->tbdf = MKBUS(BusPCI, bno, dno, fno);
sprint(buf, "%s/%d.%d.%draw", base, bno, dno, fno);
if((p->rawfd = open(buf, ORDWR)) < 0){
free(p);
continue;
}
sprint(buf, "%s/%d.%d.%dctl", base, bno, dno, fno);
if((fd = open(buf, OREAD)) < 0){
close(p->rawfd);
free(p);
continue;
}
if((j = read(fd, buf, sizeof(buf)-1)) <= 0){
close(p->rawfd);
close(fd);
free(p);
continue;
}
buf[j] = 0;
close(fd);
p->ccrb = strtol(buf, nil, 16);
p->ccru = strtol(buf + 3, nil, 16);
p->vid = strtol(buf + 9, &s, 16);
p->did = strtol(s + 1, &s, 16);
p->intl = strtol(s + 1, &s, 10);
p->rid = pcicfgr8(p, PciRID);
trace("%d.%d.%d: did=%X vid=%X rid=%X intl=%d ccru=%X\n",
bno, dno, fno, p->did, p->vid, p->rid, p->intl, p->ccru);
while(*s == ' '){
j = strtol(s+1, &s, 10);
if(j < 0 || j >= nelem(p->mem))
break;
p->mem[j].bar = strtoul(s+1, &s, 16);
p->mem[j].size = strtoul(s+1, &s, 10);
trace("\tmem[%d] = %p %d\n", j, p->mem[j].bar, p->mem[j].size);
}
if(pcilist != nil)
pcitail->list = p;
else
pcilist = p;
pcitail = p;
}
}