diff options
Diffstat (limited to 'sys/i386/i386/autoconf.c')
| -rw-r--r-- | sys/i386/i386/autoconf.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/sys/i386/i386/autoconf.c b/sys/i386/i386/autoconf.c new file mode 100644 index 0000000..7eee991 --- /dev/null +++ b/sys/i386/i386/autoconf.c @@ -0,0 +1,213 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)autoconf.c 7.1 (Berkeley) 5/9/91 + * + * PATCHES MAGIC LEVEL PATCH THAT GOT US HERE + * -------------------- ----- ---------------------- + * CURRENT PATCH LEVEL: 1 00117 + * -------------------- ----- ---------------------- + * + * 09 Apr 93 ???(From sun-lamp) Fix to report sd when Julians + * scsi code is used, allow you to swap + * root floppies during a boot + */ +static char rcsid[] = "$Header: /b/source/CVS/src/sys.386bsd/i386/i386/autoconf.c,v 1.3 1993/04/10 21:58:52 cgd Exp $"; + +/* + * Setup the system to run on the current machine. + * + * Configure() is called at boot time and initializes the vba + * device tables and the memory controller monitoring. Available + * devices are determined (from possibilities mentioned in ioconf.c), + * and the drivers are initialized. + */ +#include "param.h" +#include "systm.h" +#include "buf.h" +#include "dkstat.h" +#include "conf.h" +#include "dmap.h" +#include "reboot.h" + +#include "machine/pte.h" + +/* + * The following several variables are related to + * the configuration process, and are used in initializing + * the machine. + */ +int dkn; /* number of iostat dk numbers assigned so far */ +extern int cold; /* cold start flag initialized in locore.s */ + +/* + * Determine i/o configuration for a machine. + */ +configure() +{ + +#include "isa.h" +#if NISA > 0 + isa_configure(); +#endif + +#if GENERICxxx + if ((boothowto & RB_ASKNAME) == 0) + setroot(); + setconf(); +#else + setroot(); +#endif + /* + * Configure swap area and related system + * parameter based on device(s) used. + */ + swapconf(); + cold = 0; +} + +/* + * Configure swap space and related parameters. + */ +swapconf() +{ + register struct swdevt *swp; + register int nblks; +extern int Maxmem; + + for (swp = swdevt; swp->sw_dev > 0; swp++) + { + unsigned d = major(swp->sw_dev); + + if (d > nblkdev) break; + if (bdevsw[d].d_psize) { + nblks = (*bdevsw[d].d_psize)(swp->sw_dev); + if (nblks > 0 && + (swp->sw_nblks == 0 || swp->sw_nblks > nblks)) + swp->sw_nblks = nblks; + else + swp->sw_nblks = 0; + } + swp->sw_nblks = ctod(dtoc(swp->sw_nblks)); + } + if (dumplo == 0 && bdevsw[major(dumpdev)].d_psize) + /*dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) - physmem;*/ + dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) - + Maxmem*NBPG/512; + if (dumplo < 0) + dumplo = 0; +} + +#define DOSWAP /* change swdevt and dumpdev */ +u_long bootdev = 0; /* should be dev_t, but not until 32 bits */ + +#include "sd.h" +static char devname[][2] = { + 'w','d', /* 0 = wd */ + 's','w', /* 1 = sw */ + 'f','d', /* 2 = fd */ + 'w','t', /* 3 = wt */ +#if NSD < 1 + 'a','s', /* 4 = as */ +#else + 's','d', /* 4 = sd -- new SCSI system */ +#endif +}; + +#define PARTITIONMASK 0x7 +#define PARTITIONSHIFT 3 + +/* + * Attempt to find the device from which we were booted. + * If we can do so, and not instructed not to do so, + * change rootdev to correspond to the load device. + */ +setroot() +{ + int majdev, mindev, unit, part, adaptor; + dev_t temp, orootdev; + struct swdevt *swp; + +/*printf("howto %x bootdev %x ", boothowto, bootdev);*/ + if (boothowto & RB_DFLTROOT || + (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC) + return; + majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK; + if (majdev > sizeof(devname) / sizeof(devname[0])) + return; + adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK; + part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK; + unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK; + mindev = (unit << PARTITIONSHIFT) + part; + orootdev = rootdev; + rootdev = makedev(majdev, mindev); + /* + * If the original rootdev is the same as the one + * just calculated, don't need to adjust the swap configuration. + */ + if (rootdev == orootdev) + return; + if (devname[majdev][0] == 'f' && devname[majdev][1] == 'd') { + printf(""); + printf("* insert the floppy you want to have mounted as\n"); + printf("* root, and hit any key to continue booting:\n"); + cngetc(); + printf(""); + } + printf("changing root device to %c%c%d%c\n", + devname[majdev][0], devname[majdev][1], + mindev >> PARTITIONSHIFT, part + 'a'); +#ifdef DOSWAP + mindev &= ~PARTITIONMASK; + for (swp = swdevt; swp->sw_dev; swp++) { + if (majdev == major(swp->sw_dev) && + mindev == (minor(swp->sw_dev) & ~PARTITIONMASK)) { + + temp = swdevt[0].sw_dev; + swdevt[0].sw_dev = swp->sw_dev; + swp->sw_dev = temp; + break; + } + } + if (swp->sw_dev == 0) + return; + /* + * If dumpdev was the same as the old primary swap + * device, move it to the new primary swap device. + */ + if (temp == dumpdev) + dumpdev = swdevt[0].sw_dev; +#endif +} |
