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#include "all.h"
#include "io.h"
long niob;
long nhiob;
Hiob *hiob;
/*
* Called to allocate permanent data structures
* Alignment is in number of bytes. It pertains both to the start and
* end of the allocated memory.
*/
void*
ialloc(ulong n, int align)
{
void *p = mallocalign(n, align, 0, 0);
if (p == nil)
panic("ialloc: out of memory");
memset(p, 0, n);
return p;
}
void
prbanks(void)
{
Mbank *mbp;
for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)
print("bank[%ld]: base 0x%8.8lux, limit 0x%8.8lux (%.0fMB)\n",
mbp - mconf.bank, mbp->base, mbp->limit,
(mbp->limit - mbp->base)/(double)MB);
}
static void
cmd_memory(int, char *[])
{
prbanks();
}
enum { HWIDTH = 8 }; /* buffers per hash */
/*
* allocate rest of mem
* for io buffers.
*/
void
iobufinit(void)
{
long m;
int i;
char *xiop;
Iobuf *p, *q;
Hiob *hp;
Mbank *mbp;
wlock(&mainlock); /* init */
wunlock(&mainlock);
prbanks();
m = 0;
for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)
m += mbp->limit - mbp->base;
niob = m / (sizeof(Iobuf) + RBUFSIZE + sizeof(Hiob)/HWIDTH);
nhiob = niob / HWIDTH;
while(!prime(nhiob))
nhiob++;
print("\t%ld buffers; %ld hashes\n", niob, nhiob);
hiob = ialloc(nhiob * sizeof(Hiob), 0);
hp = hiob;
for(i=0; i<nhiob; i++) {
lock(hp);
unlock(hp);
hp++;
}
p = ialloc(niob * sizeof(Iobuf), 0);
xiop = ialloc(niob * RBUFSIZE, 0);
hp = hiob;
for(i=0; i < niob; i++) {
// p->name = "buf";
qlock(p);
qunlock(p);
if(hp == hiob)
hp = hiob + nhiob;
hp--;
q = hp->link;
if(q) {
p->fore = q;
p->back = q->back;
q->back = p;
p->back->fore = p;
} else {
hp->link = p;
p->fore = p;
p->back = p;
}
p->dev = devnone;
p->addr = -1;
// p->xiobuf = ialloc(RBUFSIZE, RBUFSIZE);
p->xiobuf = xiop;
p->iobuf = (char*)-1;
p++;
xiop += RBUFSIZE;
}
/*
* Make sure that no more of bank[0] can be used.
*/
mconf.bank[0].base = mconf.bank[0].limit;
i = 0;
for(mbp = mconf.bank; mbp < &mconf.bank[mconf.nbank]; mbp++)
i += mbp->limit - mbp->base;
print("\tmem left = %,d, out of %,ld\n", i, conf.mem);
/* paranoia: add this command as late as is easy */
cmd_install("memory", "-- print ranges of memory banks", cmd_memory);
}
void*
iobufmap(Iobuf *p)
{
return p->iobuf = p->xiobuf;
}
void
iobufunmap(Iobuf *p)
{
p->iobuf = (char*)-1;
}
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