4.1cBSD/a/sys/vaxif/if_uba.c
/* if_uba.c 4.16 82/12/17 */
#include "../machine/pte.h"
#include "../h/param.h"
#include "../h/systm.h"
#include "../h/mbuf.h"
#include "../h/map.h"
#include "../h/buf.h"
#include "../h/cmap.h"
#include "../h/vmmac.h"
#include "../h/socket.h"
#include "../net/if.h"
#include "../vax/mtpr.h"
#include "../vaxif/if_uba.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/ubavar.h"
/*
* Routines supporting UNIBUS network interfaces.
*
* TODO:
* Support interfaces using only one BDP statically.
*/
/*
* Init UNIBUS for interface on uban whose headers of size hlen are to
* end on a page boundary. We allocate a UNIBUS map register for the page
* with the header, and nmr more UNIBUS map registers for i/o on the adapter,
* doing this twice: once for reading and once for writing. We also
* allocate page frames in the mbuffer pool for these pages.
*/
if_ubainit(ifu, uban, hlen, nmr)
register struct ifuba *ifu;
int uban, hlen, nmr;
{
register caddr_t cp;
int i, ncl;
ncl = clrnd(nmr + CLSIZE) / CLSIZE;
if (ifu->ifu_r.ifrw_addr)
cp = ifu->ifu_r.ifrw_addr - (CLBYTES - hlen);
else {
cp = m_clalloc(2 * ncl, MPG_SPACE);
if (cp == 0)
return (0);
ifu->ifu_r.ifrw_addr = cp + CLBYTES - hlen;
ifu->ifu_w.ifrw_addr = ifu->ifu_r.ifrw_addr + ncl * CLBYTES;
ifu->ifu_hlen = hlen;
ifu->ifu_uban = uban;
ifu->ifu_uba = uba_hd[uban].uh_uba;
}
if (if_ubaalloc(ifu, &ifu->ifu_r, nmr) == 0)
goto bad;
if (if_ubaalloc(ifu, &ifu->ifu_w, nmr) == 0)
goto bad2;
for (i = 0; i < nmr; i++)
ifu->ifu_wmap[i] = ifu->ifu_w.ifrw_mr[i];
ifu->ifu_xswapd = 0;
return (1);
bad2:
ubarelse(ifu->ifu_uban, &ifu->ifu_r.ifrw_info);
bad:
m_pgfree(cp, 2 * ncl);
ifu->ifu_r.ifrw_addr = 0;
return (0);
}
/*
* Setup either a ifrw structure by allocating UNIBUS map registers,
* possibly a buffered data path, and initializing the fields of
* the ifrw structure to minimize run-time overhead.
*/
static
if_ubaalloc(ifu, ifrw, nmr)
struct ifuba *ifu;
register struct ifrw *ifrw;
int nmr;
{
register int info;
info =
uballoc(ifu->ifu_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->ifu_hlen,
ifu->ifu_flags);
if (info == 0)
return (0);
ifrw->ifrw_info = info;
ifrw->ifrw_bdp = UBAI_BDP(info);
ifrw->ifrw_proto = UBAMR_MRV | (UBAI_BDP(info) << UBAMR_DPSHIFT);
ifrw->ifrw_mr = &ifu->ifu_uba->uba_map[UBAI_MR(info) + 1];
return (1);
}
/*
* Pull read data off a interface.
* Len is length of data, with local net header stripped.
* Off is non-zero if a trailer protocol was used, and
* gives the offset of the trailer information.
* We copy the trailer information and then all the normal
* data into mbufs. When full cluster sized units are present
* on the interface on cluster boundaries we can get them more
* easily by remapping, and take advantage of this here.
*/
struct mbuf *
if_rubaget(ifu, totlen, off0)
register struct ifuba *ifu;
int totlen, off0;
{
struct mbuf *top, **mp, *m;
int off = off0, len;
register caddr_t cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
top = 0;
mp = ⊤
while (totlen > 0) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == 0)
goto bad;
if (off) {
len = totlen - off;
cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen + off;
} else
len = totlen;
if (len >= CLBYTES) {
struct mbuf *p;
struct pte *cpte, *ppte;
int x, *ip, i;
MCLGET(p, 1);
if (p == 0)
goto nopage;
len = m->m_len = CLBYTES;
m->m_off = (int)p - (int)m;
if (!claligned(cp))
goto copy;
/*
* Switch pages mapped to UNIBUS with new page p,
* as quick form of copy. Remap UNIBUS and invalidate.
*/
cpte = &Mbmap[mtocl(cp)*CLSIZE];
ppte = &Mbmap[mtocl(p)*CLSIZE];
x = btop(cp - ifu->ifu_r.ifrw_addr);
ip = (int *)&ifu->ifu_r.ifrw_mr[x];
for (i = 0; i < CLSIZE; i++) {
struct pte t;
t = *ppte; *ppte++ = *cpte; *cpte = t;
*ip++ =
cpte++->pg_pfnum|ifu->ifu_r.ifrw_proto;
mtpr(TBIS, cp);
cp += NBPG;
mtpr(TBIS, (caddr_t)p);
p += NBPG / sizeof (*p);
}
goto nocopy;
}
nopage:
m->m_len = MIN(MLEN, len);
m->m_off = MMINOFF;
copy:
bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len);
cp += m->m_len;
nocopy:
*mp = m;
mp = &m->m_next;
if (off) {
/* sort of an ALGOL-W style for statement... */
off += m->m_len;
if (off == totlen) {
cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen;
off = 0;
totlen = off0;
}
} else
totlen -= m->m_len;
}
return (top);
bad:
m_freem(top);
return (0);
}
/*
* Map a chain of mbufs onto a network interface
* in preparation for an i/o operation.
* The argument chain of mbufs includes the local network
* header which is copied to be in the mapped, aligned
* i/o space.
*/
if_wubaput(ifu, m)
register struct ifuba *ifu;
register struct mbuf *m;
{
register struct mbuf *mp;
register caddr_t cp, dp;
register int i;
int xswapd = 0;
int x, cc;
cp = ifu->ifu_w.ifrw_addr;
while (m) {
dp = mtod(m, char *);
if (claligned(cp) && claligned(dp) && m->m_len == CLBYTES) {
struct pte *pte; int *ip;
pte = &Mbmap[mtocl(dp)*CLSIZE];
x = btop(cp - ifu->ifu_w.ifrw_addr);
ip = (int *)&ifu->ifu_w.ifrw_mr[x];
for (i = 0; i < CLSIZE; i++)
*ip++ =
ifu->ifu_w.ifrw_proto | pte++->pg_pfnum;
xswapd |= 1 << (x>>(CLSHIFT-PGSHIFT));
mp = m->m_next;
m->m_next = ifu->ifu_xtofree;
ifu->ifu_xtofree = m;
cp += m->m_len;
} else {
bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len);
cp += m->m_len;
MFREE(m, mp);
}
m = mp;
}
/*
* Xswapd is the set of clusters we just mapped out. Ifu->ifu_xswapd
* is the set of clusters mapped out from before. We compute
* the number of clusters involved in this operation in x.
* Clusters mapped out before and involved in this operation
* should be unmapped so original pages will be accessed by the device.
*/
cc = cp - ifu->ifu_w.ifrw_addr;
x = ((cc - ifu->ifu_hlen) + CLBYTES - 1) >> CLSHIFT;
ifu->ifu_xswapd &= ~xswapd;
xswapd &= ~ifu->ifu_xswapd;
while (i = ffs(ifu->ifu_xswapd)) {
i--;
if (i >= x)
break;
ifu->ifu_xswapd &= ~(1<<i);
i *= CLSIZE;
for (x = 0; x < CLSIZE; x++) {
ifu->ifu_w.ifrw_mr[i] = ifu->ifu_wmap[i];
i++;
}
}
ifu->ifu_xswapd |= xswapd;
return (cc);
}