kernel: Use NULL for pointers in some places.
[dragonfly.git] / sys / platform / pc32 / i386 / autoconf.c
CommitLineData
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1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
37 * $FreeBSD: src/sys/i386/i386/autoconf.c,v 1.146.2.2 2001/06/07 06:05:58 dd Exp $
38 */
39
40/*
41 * Setup the system to run on the current machine.
42 *
43 * Configure() is called at boot time and initializes the vba
44 * device tables and the memory controller monitoring. Available
45 * devices are determined (from possibilities mentioned in ioconf.c),
46 * and the drivers are initialized.
47 */
48#include "opt_bootp.h"
49#include "opt_ffs.h"
50#include "opt_cd9660.h"
51#include "opt_nfs.h"
52#include "opt_nfsroot.h"
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53#include "opt_rootdevname.h"
54
1f2de5d4 55#include "use_isa.h"
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56
57#include <sys/param.h>
58#include <sys/systm.h>
fabb8ceb 59#include <sys/bootmaj.h>
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60#include <sys/bus.h>
61#include <sys/conf.h>
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62#include <sys/diskslice.h>
63#include <sys/reboot.h>
64#include <sys/kernel.h>
65#include <sys/malloc.h>
66#include <sys/mount.h>
67#include <sys/cons.h>
8f41e33b 68#include <sys/thread.h>
335dda38 69#include <sys/device.h>
37e7efec 70#include <sys/machintr.h>
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71
72#include <machine/bootinfo.h>
984263bc 73#include <machine/md_var.h>
984263bc 74#include <machine/smp.h>
a9295349 75#include <machine_base/icu/icu.h>
984263bc 76
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77#include <machine/pcb.h>
78#include <machine/pcb_ext.h>
79#include <machine/vm86.h>
80#include <machine/globaldata.h>
8f41e33b 81
984263bc 82#if NISA > 0
1f2de5d4 83#include <bus/isa/isavar.h>
984263bc 84
716a081c 85device_t isa_bus_device = NULL;
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86#endif
87
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88static void configure_first (void *);
89static void configure (void *);
90static void configure_final (void *);
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91
92#if defined(FFS) && defined(FFS_ROOT)
3ae0cd58 93static void setroot (void);
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94#endif
95
96#if defined(NFS) && defined(NFS_ROOT)
f15db79e 97#if !defined(BOOTP_NFSROOT)
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98static void pxe_setup_nfsdiskless(void);
99#endif
f15db79e 100#endif
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101
102SYSINIT(configure1, SI_SUB_CONFIGURE, SI_ORDER_FIRST, configure_first, NULL);
103/* SI_ORDER_SECOND is hookable */
104SYSINIT(configure2, SI_SUB_CONFIGURE, SI_ORDER_THIRD, configure, NULL);
105/* SI_ORDER_MIDDLE is hookable */
106SYSINIT(configure3, SI_SUB_CONFIGURE, SI_ORDER_ANY, configure_final, NULL);
107
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108cdev_t rootdev = NULL;
109cdev_t dumpdev = NULL;
984263bc 110
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111/*
112 * Determine i/o configuration for a machine.
113 */
114static void
f123d5a1 115configure_first(void *dummy)
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116{
117}
118
119static void
f123d5a1 120configure(void *dummy)
984263bc 121{
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122 /*
123 * This will configure all devices, generally starting with the
124 * nexus (i386/i386/nexus.c). The nexus ISA code explicitly
125 * dummies up the attach in order to delay legacy initialization
126 * until after all other busses/subsystems have had a chance
127 * at those resources.
128 */
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129 root_bus_configure();
130
131#if NISA > 0
132 /*
133 * Explicitly probe and attach ISA last. The isa bus saves
134 * it's device node at attach time for us here.
135 */
136 if (isa_bus_device)
137 isa_probe_children(isa_bus_device);
138#endif
139
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140 /*
141 * Allow lowering of the ipl to the lowest kernel level if we
142 * panic (or call tsleep() before clearing `cold'). No level is
143 * completely safe (since a panic may occur in a critical region
144 * at splhigh()), but we want at least bio interrupts to work.
145 */
e43a034f 146 safepri = TDPRI_KERN_USER;
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147}
148
149static void
f123d5a1 150configure_final(void *dummy)
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151{
152 int i;
153
154 cninit_finish();
155
156 if (bootverbose) {
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157 /*
158 * Print out the BIOS's idea of the disk geometries.
159 */
26be20a0 160 kprintf("BIOS Geometries:\n");
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161 for (i = 0; i < N_BIOS_GEOM; i++) {
162 unsigned long bios_geom;
163 int max_cylinder, max_head, max_sector;
164
165 bios_geom = bootinfo.bi_bios_geom[i];
166
167 /*
168 * XXX the bootstrap punts a 1200K floppy geometry
169 * when the get-disk-geometry interrupt fails. Skip
170 * drives that have this geometry.
171 */
172 if (bios_geom == 0x4f010f)
173 continue;
174
26be20a0 175 kprintf(" %x:%08lx ", i, bios_geom);
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176 max_cylinder = bios_geom >> 16;
177 max_head = (bios_geom >> 8) & 0xff;
178 max_sector = bios_geom & 0xff;
26be20a0 179 kprintf(
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180 "0..%d=%d cylinders, 0..%d=%d heads, 1..%d=%d sectors\n",
181 max_cylinder, max_cylinder + 1,
182 max_head, max_head + 1,
183 max_sector, max_sector);
184 }
26be20a0 185 kprintf(" %d accounted for\n", bootinfo.bi_n_bios_used);
984263bc 186
26be20a0 187 kprintf("Device configuration finished.\n");
984263bc 188 }
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189}
190
191#ifdef BOOTP
f15db79e 192void bootpc_init(void);
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193#endif
194/*
195 * Do legacy root filesystem discovery.
196 */
197void
f123d5a1 198cpu_rootconf(void)
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199{
200#ifdef BOOTP
201 bootpc_init();
202#endif
203#if defined(NFS) && defined(NFS_ROOT)
204#if !defined(BOOTP_NFSROOT)
205 pxe_setup_nfsdiskless();
206 if (nfs_diskless_valid)
207#endif
208 rootdevnames[0] = "nfs:";
209#endif
210#if defined(FFS) && defined(FFS_ROOT)
211 if (!rootdevnames[0])
212 setroot();
213#endif
214}
215SYSINIT(cpu_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, cpu_rootconf, NULL)
216
b13267a5 217u_long bootdev = 0; /* not a cdev_t - encoding is different */
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218
219#if defined(FFS) && defined(FFS_ROOT)
220#define FDMAJOR 2
221#define FDUNITSHIFT 6
222
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223/*
224 * The boot code uses old block device major numbers to pass bootdev to
225 * us. We have to translate these to character device majors because
226 * we don't have block devices any more.
227 */
228static int
229boot_translate_majdev(int bmajor)
230{
231 static int conv[] = { BOOTMAJOR_CONVARY };
232
c157ff7a 233 if (bmajor >= 0 && bmajor < NELEM(conv))
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234 return(conv[bmajor]);
235 return(-1);
236}
237
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238/*
239 * Attempt to find the device from which we were booted.
240 * If we can do so, and not instructed not to do so,
241 * set rootdevs[] and rootdevnames[] to correspond to the
242 * boot device(s).
243 *
244 * This code survives in order to allow the system to be
245 * booted from legacy environments that do not correctly
246 * populate the kernel environment. There are significant
247 * restrictions on the bootability of the system in this
248 * situation; it can only be mounting root from a 'da'
249 * 'wd' or 'fd' device, and the root filesystem must be ufs.
250 */
251static void
f123d5a1 252setroot(void)
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253{
254 int majdev, mindev, unit, slice, part;
b13267a5 255 cdev_t newrootdev, dev;
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256 char partname[2];
257 char *sname;
258
259 if ((bootdev & B_MAGICMASK) != B_DEVMAGIC) {
26be20a0 260 kprintf("no B_DEVMAGIC (bootdev=%#lx)\n", bootdev);
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261 return;
262 }
fabb8ceb 263 majdev = boot_translate_majdev(B_TYPE(bootdev));
422bd071 264 if (bootverbose) {
26be20a0 265 kprintf("bootdev: %08lx type=%ld unit=%ld "
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266 "slice=%ld part=%ld major=%d\n",
267 bootdev, B_TYPE(bootdev), B_UNIT(bootdev),
268 B_SLICE(bootdev), B_PARTITION(bootdev), majdev);
269 }
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270 dev = udev2dev(makeudev(majdev, 0), 0);
271 if (!dev_is_good(dev))
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272 return;
273 unit = B_UNIT(bootdev);
274 slice = B_SLICE(bootdev);
275 if (slice == WHOLE_DISK_SLICE)
276 slice = COMPATIBILITY_SLICE;
277 if (slice < 0 || slice >= MAX_SLICES) {
26be20a0 278 kprintf("bad slice\n");
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279 return;
280 }
281
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282 part = B_PARTITION(bootdev);
283 mindev = dkmakeminor(unit, slice, part);
e4c9c0c8 284 newrootdev = udev2dev(makeudev(majdev, mindev), 0);
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285 if (!dev_is_good(newrootdev))
286 return;
984263bc 287 sname = dsname(newrootdev, unit, slice, part, partname);
efda3bd0 288 rootdevnames[0] = kmalloc(strlen(sname) + 6, M_DEVBUF, M_WAITOK);
f8c7a42d 289 ksprintf(rootdevnames[0], "ufs:%s%s", sname, partname);
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290
291 /*
292 * For properly dangerously dedicated disks (ones with a historical
293 * bogus partition table), the boot blocks will give slice = 4, but
294 * the kernel will only provide the compatibility slice since it
295 * knows that slice 4 is not a real slice. Arrange to try mounting
296 * the compatibility slice as root if mounting the slice passed by
297 * the boot blocks fails. This handles the dangerously dedicated
298 * case and perhaps others.
299 */
300 if (slice == COMPATIBILITY_SLICE)
301 return;
302 slice = COMPATIBILITY_SLICE;
303 sname = dsname(newrootdev, unit, slice, part, partname);
efda3bd0 304 rootdevnames[1] = kmalloc(strlen(sname) + 6, M_DEVBUF, M_WAITOK);
f8c7a42d 305 ksprintf(rootdevnames[1], "ufs:%s%s", sname, partname);
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306}
307#endif
308
309#if defined(NFS) && defined(NFS_ROOT)
f15db79e 310#if !defined(BOOTP_NFSROOT)
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311
312#include <sys/socket.h>
313#include <net/if.h>
314#include <net/if_dl.h>
315#include <net/if_types.h>
316#include <net/if_var.h>
317#include <net/ethernet.h>
318#include <netinet/in.h>
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319#include <vfs/nfs/rpcv2.h>
320#include <vfs/nfs/nfsproto.h>
321#include <vfs/nfs/nfs.h>
322#include <vfs/nfs/nfsdiskless.h>
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323
324extern struct nfs_diskless nfs_diskless;
325
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326/*
327 * Convert a kenv variable to a sockaddr. If the kenv variable does not
328 * exist the sockaddr will remain zerod out (callers typically just check
329 * sin_len). A network address of 0.0.0.0 is equivalent to failure.
330 */
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331static int
332inaddr_to_sockaddr(char *ev, struct sockaddr_in *sa)
333{
334 u_int32_t a[4];
335 char *cp;
336
337 bzero(sa, sizeof(*sa));
984263bc 338
bc01a404 339 if ((cp = kgetenv(ev)) == NULL)
984263bc 340 return(1);
e93690c2 341 if (ksscanf(cp, "%d.%d.%d.%d", &a[0], &a[1], &a[2], &a[3]) != 4)
984263bc 342 return(1);
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343 if (a[0] == 0 && a[1] == 0 && a[2] == 0 && a[3] == 0)
344 return(1);
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345 /* XXX is this ordering correct? */
346 sa->sin_addr.s_addr = (a[3] << 24) + (a[2] << 16) + (a[1] << 8) + a[0];
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347 sa->sin_len = sizeof(*sa);
348 sa->sin_family = AF_INET;
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349 return(0);
350}
351
352static int
353hwaddr_to_sockaddr(char *ev, struct sockaddr_dl *sa)
354{
355 char *cp;
356 u_int32_t a[6];
357
358 bzero(sa, sizeof(*sa));
359 sa->sdl_len = sizeof(*sa);
360 sa->sdl_family = AF_LINK;
361 sa->sdl_type = IFT_ETHER;
362 sa->sdl_alen = ETHER_ADDR_LEN;
bc01a404 363 if ((cp = kgetenv(ev)) == NULL)
984263bc 364 return(1);
e93690c2 365 if (ksscanf(cp, "%x:%x:%x:%x:%x:%x", &a[0], &a[1], &a[2], &a[3], &a[4], &a[5]) != 6)
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366 return(1);
367 sa->sdl_data[0] = a[0];
368 sa->sdl_data[1] = a[1];
369 sa->sdl_data[2] = a[2];
370 sa->sdl_data[3] = a[3];
371 sa->sdl_data[4] = a[4];
372 sa->sdl_data[5] = a[5];
373 return(0);
374}
375
376static int
377decode_nfshandle(char *ev, u_char *fh)
378{
379 u_char *cp;
380 int len, val;
381
bc01a404 382 if (((cp = kgetenv(ev)) == NULL) || (strlen(cp) < 2) || (*cp != 'X'))
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383 return(0);
384 len = 0;
385 cp++;
386 for (;;) {
387 if (*cp == 'X')
388 return(len);
e93690c2 389 if ((ksscanf(cp, "%2x", &val) != 1) || (val > 0xff))
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390 return(0);
391 *(fh++) = val;
392 len++;
393 cp += 2;
394 if (len > NFSX_V2FH)
395 return(0);
396 }
397}
398
399/*
400 * Populate the essential fields in the nfsv3_diskless structure.
401 *
402 * The loader is expected to export the following environment variables:
403 *
404 * boot.netif.ip IP address on boot interface
405 * boot.netif.netmask netmask on boot interface
406 * boot.netif.gateway default gateway (optional)
407 * boot.netif.hwaddr hardware address of boot interface
408 * boot.nfsroot.server IP address of root filesystem server
409 * boot.nfsroot.path path of the root filesystem on server
410 * boot.nfsroot.nfshandle NFS handle for root filesystem on server
411 */
412static void
f123d5a1 413pxe_setup_nfsdiskless(void)
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414{
415 struct nfs_diskless *nd = &nfs_diskless;
416 struct ifnet *ifp;
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417 struct sockaddr_dl *sdl, ourdl;
418 struct sockaddr_in myaddr, netmask;
419 char *cp;
420
421 /* set up interface */
422 if (inaddr_to_sockaddr("boot.netif.ip", &myaddr))
423 return;
424 if (inaddr_to_sockaddr("boot.netif.netmask", &netmask)) {
26be20a0 425 kprintf("PXE: no netmask\n");
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426 return;
427 }
428 bcopy(&myaddr, &nd->myif.ifra_addr, sizeof(myaddr));
429 bcopy(&myaddr, &nd->myif.ifra_broadaddr, sizeof(myaddr));
430 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
431 myaddr.sin_addr.s_addr | ~ netmask.sin_addr.s_addr;
432 bcopy(&netmask, &nd->myif.ifra_mask, sizeof(netmask));
433
434 if (hwaddr_to_sockaddr("boot.netif.hwaddr", &ourdl)) {
26be20a0 435 kprintf("PXE: no hardware address\n");
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436 return;
437 }
984263bc 438 TAILQ_FOREACH(ifp, &ifnet, if_link) {
b2632176
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439 struct ifaddr_container *ifac;
440
441 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
442 struct ifaddr *ifa = ifac->ifa;
443
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444 if ((ifa->ifa_addr->sa_family == AF_LINK) &&
445 (sdl = ((struct sockaddr_dl *)ifa->ifa_addr))) {
446 if ((sdl->sdl_type == ourdl.sdl_type) &&
447 (sdl->sdl_alen == ourdl.sdl_alen) &&
448 !bcmp(sdl->sdl_data + sdl->sdl_nlen,
449 ourdl.sdl_data + ourdl.sdl_nlen,
450 sdl->sdl_alen))
451 goto match_done;
452 }
453 }
454 }
26be20a0 455 kprintf("PXE: no interface\n");
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456 return; /* no matching interface */
457match_done:
3e4a09e7 458 strlcpy(nd->myif.ifra_name, ifp->if_xname, sizeof(nd->myif.ifra_name));
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459
460 /* set up gateway */
461 inaddr_to_sockaddr("boot.netif.gateway", &nd->mygateway);
462
463 /* XXX set up swap? */
464
465 /* set up root mount */
466 nd->root_args.rsize = 8192; /* XXX tunable? */
467 nd->root_args.wsize = 8192;
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468 nd->root_args.sotype = SOCK_STREAM;
469 nd->root_args.flags = NFSMNT_WSIZE | NFSMNT_RSIZE | NFSMNT_RESVPORT;
984263bc 470 if (inaddr_to_sockaddr("boot.nfsroot.server", &nd->root_saddr)) {
26be20a0 471 kprintf("PXE: no server\n");
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472 return;
473 }
474 nd->root_saddr.sin_port = htons(NFS_PORT);
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475
476 /*
477 * A tftp-only loader may pass NFS path information without a
478 * root handle. Generate a warning but continue configuring.
479 */
984263bc 480 if (decode_nfshandle("boot.nfsroot.nfshandle", &nd->root_fh[0]) == 0) {
26be20a0 481 kprintf("PXE: Warning, no NFS handle passed from loader\n");
984263bc 482 }
bc01a404 483 if ((cp = kgetenv("boot.nfsroot.path")) != NULL)
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484 strncpy(nd->root_hostnam, cp, MNAMELEN - 1);
485
486 nfs_diskless_valid = 1;
487}
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488
489#endif
984263bc 490#endif