Commit | Line | Data |
---|---|---|
e6822062 | 1 | /* if_uba.c 6.3 85/06/03 */ |
961945a8 SL |
2 | |
3 | #include "../machine/pte.h" | |
0468e5fa | 4 | |
a6e960e7 JB |
5 | #include "param.h" |
6 | #include "systm.h" | |
7 | #include "mbuf.h" | |
8 | #include "map.h" | |
9 | #include "buf.h" | |
10 | #include "cmap.h" | |
11 | #include "vmmac.h" | |
12 | #include "socket.h" | |
eaa60542 | 13 | |
8a13b737 | 14 | #include "../net/if.h" |
eaa60542 BJ |
15 | |
16 | #include "../vax/mtpr.h" | |
a6e960e7 | 17 | #include "if_uba.h" |
eaa60542 BJ |
18 | #include "../vaxuba/ubareg.h" |
19 | #include "../vaxuba/ubavar.h" | |
0468e5fa BJ |
20 | |
21 | /* | |
22 | * Routines supporting UNIBUS network interfaces. | |
23 | * | |
24 | * TODO: | |
25 | * Support interfaces using only one BDP statically. | |
26 | */ | |
27 | ||
28 | /* | |
29 | * Init UNIBUS for interface on uban whose headers of size hlen are to | |
30 | * end on a page boundary. We allocate a UNIBUS map register for the page | |
31 | * with the header, and nmr more UNIBUS map registers for i/o on the adapter, | |
32 | * doing this twice: once for reading and once for writing. We also | |
33 | * allocate page frames in the mbuffer pool for these pages. | |
34 | */ | |
35 | if_ubainit(ifu, uban, hlen, nmr) | |
36 | register struct ifuba *ifu; | |
37 | int uban, hlen, nmr; | |
38 | { | |
97da2a42 | 39 | register caddr_t cp; |
e6822062 | 40 | int i, ncl, off; |
0468e5fa | 41 | |
e6822062 MK |
42 | if (hlen) |
43 | off = CLBYTES - hlen; | |
44 | else | |
45 | off = 0; | |
46 | ncl = clrnd(nmr) / CLSIZE; | |
47 | if (hlen) | |
48 | ncl++; | |
176c481f | 49 | if (ifu->ifu_r.ifrw_addr) |
e6822062 | 50 | cp = ifu->ifu_r.ifrw_addr - off; |
176c481f BJ |
51 | else { |
52 | cp = m_clalloc(2 * ncl, MPG_SPACE); | |
53 | if (cp == 0) | |
54 | return (0); | |
e6822062 | 55 | ifu->ifu_r.ifrw_addr = cp + off; |
176c481f BJ |
56 | ifu->ifu_w.ifrw_addr = ifu->ifu_r.ifrw_addr + ncl * CLBYTES; |
57 | ifu->ifu_hlen = hlen; | |
58 | ifu->ifu_uban = uban; | |
59 | ifu->ifu_uba = uba_hd[uban].uh_uba; | |
60 | } | |
b454c3ea | 61 | if (if_ubaalloc(ifu, &ifu->ifu_r, nmr) == 0) |
0468e5fa | 62 | goto bad; |
b454c3ea | 63 | if (if_ubaalloc(ifu, &ifu->ifu_w, nmr) == 0) |
0468e5fa | 64 | goto bad2; |
b454c3ea | 65 | for (i = 0; i < nmr; i++) |
97da2a42 | 66 | ifu->ifu_wmap[i] = ifu->ifu_w.ifrw_mr[i]; |
8a13b737 | 67 | ifu->ifu_xswapd = 0; |
0468e5fa BJ |
68 | return (1); |
69 | bad2: | |
8a13b737 | 70 | ubarelse(ifu->ifu_uban, &ifu->ifu_r.ifrw_info); |
0468e5fa | 71 | bad: |
97da2a42 | 72 | m_pgfree(cp, 2 * ncl); |
176c481f | 73 | ifu->ifu_r.ifrw_addr = 0; |
0468e5fa BJ |
74 | return (0); |
75 | } | |
76 | ||
77 | /* | |
78 | * Setup either a ifrw structure by allocating UNIBUS map registers, | |
d6391cba SL |
79 | * possibly a buffered data path, and initializing the fields of |
80 | * the ifrw structure to minimize run-time overhead. | |
0468e5fa BJ |
81 | */ |
82 | static | |
b454c3ea | 83 | if_ubaalloc(ifu, ifrw, nmr) |
0468e5fa BJ |
84 | struct ifuba *ifu; |
85 | register struct ifrw *ifrw; | |
b454c3ea | 86 | int nmr; |
0468e5fa BJ |
87 | { |
88 | register int info; | |
89 | ||
90 | info = | |
b454c3ea | 91 | uballoc(ifu->ifu_uban, ifrw->ifrw_addr, nmr*NBPG + ifu->ifu_hlen, |
d6391cba | 92 | ifu->ifu_flags); |
0468e5fa | 93 | if (info == 0) |
8a13b737 | 94 | return (0); |
0468e5fa BJ |
95 | ifrw->ifrw_info = info; |
96 | ifrw->ifrw_bdp = UBAI_BDP(info); | |
97da2a42 | 97 | ifrw->ifrw_proto = UBAMR_MRV | (UBAI_BDP(info) << UBAMR_DPSHIFT); |
e6822062 MK |
98 | ifrw->ifrw_mr = &ifu->ifu_uba->uba_map[UBAI_MR(info) + (ifu->ifu_hlen? |
99 | 1 : 0)]; | |
8a13b737 | 100 | return (1); |
0468e5fa BJ |
101 | } |
102 | ||
103 | /* | |
f1b2fa5b BJ |
104 | * Pull read data off a interface. |
105 | * Len is length of data, with local net header stripped. | |
106 | * Off is non-zero if a trailer protocol was used, and | |
107 | * gives the offset of the trailer information. | |
108 | * We copy the trailer information and then all the normal | |
109 | * data into mbufs. When full cluster sized units are present | |
110 | * on the interface on cluster boundaries we can get them more | |
111 | * easily by remapping, and take advantage of this here. | |
0468e5fa BJ |
112 | */ |
113 | struct mbuf * | |
f1b2fa5b | 114 | if_rubaget(ifu, totlen, off0) |
0468e5fa | 115 | register struct ifuba *ifu; |
f1b2fa5b | 116 | int totlen, off0; |
0468e5fa | 117 | { |
b454c3ea BJ |
118 | struct mbuf *top, **mp, *m; |
119 | int off = off0, len; | |
97da2a42 | 120 | register caddr_t cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen; |
0468e5fa | 121 | |
0468e5fa | 122 | |
f1b2fa5b BJ |
123 | top = 0; |
124 | mp = ⊤ | |
125 | while (totlen > 0) { | |
cce93e4b | 126 | MGET(m, M_DONTWAIT, MT_DATA); |
0468e5fa | 127 | if (m == 0) |
8a13b737 | 128 | goto bad; |
f1b2fa5b BJ |
129 | if (off) { |
130 | len = totlen - off; | |
131 | cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen + off; | |
132 | } else | |
133 | len = totlen; | |
97da2a42 | 134 | if (len >= CLBYTES) { |
b454c3ea | 135 | struct mbuf *p; |
0468e5fa | 136 | struct pte *cpte, *ppte; |
b454c3ea | 137 | int x, *ip, i; |
0468e5fa BJ |
138 | |
139 | MCLGET(p, 1); | |
140 | if (p == 0) | |
141 | goto nopage; | |
97da2a42 | 142 | len = m->m_len = CLBYTES; |
0468e5fa | 143 | m->m_off = (int)p - (int)m; |
b454c3ea | 144 | if (!claligned(cp)) |
0468e5fa BJ |
145 | goto copy; |
146 | ||
147 | /* | |
b454c3ea BJ |
148 | * Switch pages mapped to UNIBUS with new page p, |
149 | * as quick form of copy. Remap UNIBUS and invalidate. | |
0468e5fa | 150 | */ |
b454c3ea BJ |
151 | cpte = &Mbmap[mtocl(cp)*CLSIZE]; |
152 | ppte = &Mbmap[mtocl(p)*CLSIZE]; | |
8a13b737 | 153 | x = btop(cp - ifu->ifu_r.ifrw_addr); |
97da2a42 | 154 | ip = (int *)&ifu->ifu_r.ifrw_mr[x]; |
0468e5fa BJ |
155 | for (i = 0; i < CLSIZE; i++) { |
156 | struct pte t; | |
b454c3ea | 157 | t = *ppte; *ppte++ = *cpte; *cpte = t; |
0468e5fa | 158 | *ip++ = |
8a13b737 | 159 | cpte++->pg_pfnum|ifu->ifu_r.ifrw_proto; |
0468e5fa | 160 | mtpr(TBIS, cp); |
8a13b737 | 161 | cp += NBPG; |
0468e5fa | 162 | mtpr(TBIS, (caddr_t)p); |
8a13b737 | 163 | p += NBPG / sizeof (*p); |
0468e5fa BJ |
164 | } |
165 | goto nocopy; | |
166 | } | |
167 | nopage: | |
168 | m->m_len = MIN(MLEN, len); | |
169 | m->m_off = MMINOFF; | |
170 | copy: | |
171 | bcopy(cp, mtod(m, caddr_t), (unsigned)m->m_len); | |
172 | cp += m->m_len; | |
173 | nocopy: | |
f1b2fa5b BJ |
174 | *mp = m; |
175 | mp = &m->m_next; | |
176 | if (off) { | |
b454c3ea | 177 | /* sort of an ALGOL-W style for statement... */ |
f1b2fa5b BJ |
178 | off += m->m_len; |
179 | if (off == totlen) { | |
180 | cp = ifu->ifu_r.ifrw_addr + ifu->ifu_hlen; | |
181 | off = 0; | |
97da2a42 | 182 | totlen = off0; |
f1b2fa5b | 183 | } |
97da2a42 | 184 | } else |
c7a4fdbf | 185 | totlen -= m->m_len; |
0468e5fa BJ |
186 | } |
187 | return (top); | |
188 | bad: | |
189 | m_freem(top); | |
190 | return (0); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Map a chain of mbufs onto a network interface | |
195 | * in preparation for an i/o operation. | |
196 | * The argument chain of mbufs includes the local network | |
197 | * header which is copied to be in the mapped, aligned | |
198 | * i/o space. | |
199 | */ | |
200 | if_wubaput(ifu, m) | |
201 | register struct ifuba *ifu; | |
202 | register struct mbuf *m; | |
203 | { | |
204 | register struct mbuf *mp; | |
205 | register caddr_t cp, dp; | |
206 | register int i; | |
b454c3ea | 207 | int xswapd = 0; |
e6822062 | 208 | int x, cc, t; |
0468e5fa | 209 | |
0468e5fa BJ |
210 | cp = ifu->ifu_w.ifrw_addr; |
211 | while (m) { | |
212 | dp = mtod(m, char *); | |
97da2a42 | 213 | if (claligned(cp) && claligned(dp) && m->m_len == CLBYTES) { |
0468e5fa | 214 | struct pte *pte; int *ip; |
b454c3ea | 215 | pte = &Mbmap[mtocl(dp)*CLSIZE]; |
0468e5fa | 216 | x = btop(cp - ifu->ifu_w.ifrw_addr); |
97da2a42 | 217 | ip = (int *)&ifu->ifu_w.ifrw_mr[x]; |
0468e5fa BJ |
218 | for (i = 0; i < CLSIZE; i++) |
219 | *ip++ = | |
220 | ifu->ifu_w.ifrw_proto | pte++->pg_pfnum; | |
97da2a42 | 221 | xswapd |= 1 << (x>>(CLSHIFT-PGSHIFT)); |
b454c3ea BJ |
222 | mp = m->m_next; |
223 | m->m_next = ifu->ifu_xtofree; | |
224 | ifu->ifu_xtofree = m; | |
225 | cp += m->m_len; | |
226 | } else { | |
0468e5fa | 227 | bcopy(mtod(m, caddr_t), cp, (unsigned)m->m_len); |
b454c3ea BJ |
228 | cp += m->m_len; |
229 | MFREE(m, mp); | |
230 | } | |
0468e5fa BJ |
231 | m = mp; |
232 | } | |
b454c3ea BJ |
233 | |
234 | /* | |
235 | * Xswapd is the set of clusters we just mapped out. Ifu->ifu_xswapd | |
236 | * is the set of clusters mapped out from before. We compute | |
237 | * the number of clusters involved in this operation in x. | |
238 | * Clusters mapped out before and involved in this operation | |
239 | * should be unmapped so original pages will be accessed by the device. | |
240 | */ | |
241 | cc = cp - ifu->ifu_w.ifrw_addr; | |
242 | x = ((cc - ifu->ifu_hlen) + CLBYTES - 1) >> CLSHIFT; | |
97da2a42 | 243 | ifu->ifu_xswapd &= ~xswapd; |
0468e5fa | 244 | xswapd &= ~ifu->ifu_xswapd; |
97da2a42 BJ |
245 | while (i = ffs(ifu->ifu_xswapd)) { |
246 | i--; | |
247 | if (i >= x) | |
248 | break; | |
249 | ifu->ifu_xswapd &= ~(1<<i); | |
250 | i *= CLSIZE; | |
e6822062 | 251 | for (t = 0; t < CLSIZE; t++) { |
97da2a42 BJ |
252 | ifu->ifu_w.ifrw_mr[i] = ifu->ifu_wmap[i]; |
253 | i++; | |
0468e5fa | 254 | } |
97da2a42 | 255 | } |
b454c3ea BJ |
256 | ifu->ifu_xswapd |= xswapd; |
257 | return (cc); | |
0468e5fa | 258 | } |