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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
/*
* Host Communication buffer rings
*/
/*
* initialise receive and transmit buffer rings
*
* the ring entries must be uncached
*/
BD*
bdalloc(ulong nd)
{
BD *b;
b = xspanalloc(nd*sizeof(*b), CACHELINESZ, 0);
if(b == nil)
panic("bdalloc");
return mmucacheinhib(b, nd*sizeof(*b));
}
int
ioringinit(Ring* r, int nrdre, int ntdre)
{
int i;
r->nrdre = nrdre;
if(r->rdr == nil)
r->rdr = bdalloc(nrdre);
if(r->rxb == nil)
r->rxb = malloc(nrdre*sizeof(Block*));
if(r->rdr == nil || r->rxb == nil)
return -1;
for(i = 0; i < nrdre; i++){
r->rxb[i] = nil;
r->rdr[i].ctrl = 0;
r->rdr[i].size = 0;
r->rdr[i].addr = 0;
if(i)
r->rdr[i-1].next = PADDR(&r->rdr[i]);
}
r->rdr[i-1].next = PADDR(&r->rdr[0]);
r->rdrx = 0;
r->ntdre = ntdre;
if(r->tdr == nil)
r->tdr = bdalloc(ntdre);
if(r->txb == nil)
r->txb = malloc(ntdre*sizeof(Block*));
if(r->tdr == nil || r->txb == nil)
return -1;
for(i = 0; i < ntdre; i++){
r->txb[i] = nil;
r->tdr[i].ctrl = 0;
r->tdr[i].size = 0;
r->tdr[i].addr = 0;
if(i)
r->tdr[i-1].next = PADDR(&r->tdr[i]);
}
r->tdr[i-1].next = PADDR(&r->tdr[0]);
r->tdrh = 0;
r->tdri = 0;
r->ntq = 0;
return 0;
}
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