/*
* This is called by main to set dumplo and dumpsize.
* Dumps always skip the first PAGE_SIZE of disk space
* in case there might be a disk label stored there.
* If there is extra space, put dump at the end to
* reduce the chance that swapping trashes it.
*
* Sparse dumps can't placed as close to the end as possible, because
* savecore(8) has to know where to start reading in the dump device
* before it has access to any of the crashed system's state.
*
* Note also that a sparse dump will never be larger than a full one:
* in order to add a phys_ram_seg_t to the header, at least one page
* must be removed.
*/
void
cpu_dumpconf(void)
{
const struct bdevsw *bdev;
int nblks, dumpblks; /* size of dump area */
if (dumpdev == NODEV)
goto bad;
bdev = bdevsw_lookup(dumpdev);
if (bdev == NULL) {
dumpdev = NODEV;
goto bad;
}
if (bdev->d_psize == NULL)
goto bad;
nblks = (*bdev->d_psize)(dumpdev);
if (nblks <= ctod(1))
goto bad;
dumpblks = cpu_dumpsize();
if (dumpblks < 0)
goto bad;
dumpblks += ctod(cpu_dump_mempagecnt());
/* If dump won't fit (incl. room for possible label): */
if (dumpblks > (nblks - ctod(1))) {
/* A sparse dump might (and hopefully will) fit. */
dumplo = ctod(1);
} else {
/* Put dump at end of partition */
dumplo = nblks - dumpblks;
}
/* dumpsize is in page units, and doesn't include headers. */
dumpsize = cpu_dump_mempagecnt();
/* Now that we've decided this will work, init ancillary stuff. */
dump_misc_init();
return;
bad:
dumpsize = 0;
}
/*
* This is called by main to set dumplo and dumpsize.
* Dumps always skip the first PAGE_SIZE of disk space
* in case there might be a disk label stored there.
* If there is extra space, put dump at the end to
* reduce the chance that swapping trashes it.
*/
void
dumpconf(void)
{
const struct bdevsw *bdev;
int nblks, dumpblks; /* size of dump area */
if (dumpdev == NODEV)
goto bad;
bdev = &bdevsw[major(dumpdev)];
if (bdev == NULL)
panic("dumpconf: bad dumpdev=0x%x", dumpdev);
if (bdev->d_psize == NULL)
goto bad;
nblks = (*bdev->d_psize)(dumpdev);
if (nblks <= ctod(1))
goto bad;
dumpblks = cpu_dumpsize();
if (dumpblks < 0)
goto bad;
dumpblks += ctod(cpu_dump_mempagecnt());
/* If dump won't fit (incl. room for possible label), punt. */
if (dumpblks > (nblks - ctod(1)))
goto bad;
/* Put dump at end of partition */
dumplo = nblks - dumpblks;
/* dumpsize is in page units, and doesn't include headers. */
dumpsize = cpu_dump_mempagecnt();
return;
bad:
dumpsize = 0;
}
void
dumpsys(void)
{
u_long totalbytesleft, bytes, i, n, memseg;
u_long maddr;
daddr_t blkno;
int (*dump)(dev_t, daddr_t, caddr_t, size_t);
int error;
/* Save registers. */
savectx(&dumppcb);
if (dumpdev == NODEV)
return;
/*
* For dumps during autoconfiguration,
* if dump device has already configured...
*/
if (dumpsize == 0)
dumpconf();
if (dumplo <= 0 || dumpsize == 0) {
printf("\ndump to dev %u,%u not possible\n", major(dumpdev),
minor(dumpdev));
return;
}
printf("\ndumping to dev %u,%u offset %ld\n", major(dumpdev),
minor(dumpdev), dumplo);
error = (*bdevsw[major(dumpdev)].d_psize)(dumpdev);
printf("dump ");
if (error == -1) {
printf("area unavailable\n");
return;
}
if ((error = cpu_dump()) != 0)
goto err;
totalbytesleft = ptoa(cpu_dump_mempagecnt());
blkno = dumplo + cpu_dumpsize();
dump = bdevsw[major(dumpdev)].d_dump;
error = 0;
for (memseg = 0; memseg < mem_cluster_cnt; memseg++) {
maddr = mem_clusters[memseg].start;
bytes = mem_clusters[memseg].size;
for (i = 0; i < bytes; i += n, totalbytesleft -= n) {
/* Print out how many MBs we have left to go. */
if ((totalbytesleft % (1024*1024)) == 0)
printf("%ld ", totalbytesleft / (1024 * 1024));
/* Limit size for next transfer. */
n = bytes - i;
if (n > BYTES_PER_DUMP)
n = BYTES_PER_DUMP;
(void) pmap_map(dumpspace, maddr, maddr + n,
VM_PROT_READ);
error = (*dump)(dumpdev, blkno, (caddr_t)dumpspace, n);
if (error)
goto err;
maddr += n;
blkno += btodb(n); /* XXX? */
#if 0 /* XXX this doesn't work. grr. */
/* operator aborting dump? */
if (sget() != NULL) {
error = EINTR;
break;
}
#endif
}
}
err:
switch (error) {
case ENXIO:
printf("device bad\n");
break;
case EFAULT:
printf("device not ready\n");
break;
case EINVAL:
printf("area improper\n");
break;
case EIO:
printf("i/o error\n");
break;
case EINTR:
printf("aborted from console\n");
break;
case 0:
printf("succeeded\n");
break;
default:
printf("error %d\n", error);
break;
}
printf("\n\n");
delay(5000000); /* 5 seconds */
}
