1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)autoconf.c 8.1 (Berkeley) 06/11/93 11 */ 12 13 /* 14 * Setup the system to run on the current machine. 15 * 16 * Configure() is called at boot time and initializes the vba 17 * device tables and the memory controller monitoring. Available 18 * devices are determined (from possibilities mentioned in ioconf.c), 19 * and the drivers are initialized. 20 */ 21 #include <sys/param.h> 22 #include <sys/systm.h> 23 #include <sys/map.h> 24 #include <sys/buf.h> 25 #include <sys/dkstat.h> 26 #include <sys/conf.h> 27 #include <sys/dmap.h> 28 #include <sys/reboot.h> 29 30 #include <machine/pte.h> 31 32 /* 33 * The following several variables are related to 34 * the configuration process, and are used in initializing 35 * the machine. 36 */ 37 int dkn; /* number of iostat dk numbers assigned so far */ 38 extern int cold; /* cold start flag initialized in locore.s */ 39 40 /* 41 * Determine i/o configuration for a machine. 42 */ 43 configure() 44 { 45 46 #include "isa.h" 47 #if NISA > 0 48 isa_configure(); 49 #endif 50 51 #if GENERICxxx 52 if ((boothowto & RB_ASKNAME) == 0) 53 setroot(); 54 setconf(); 55 #else 56 setroot(); 57 #endif 58 /* 59 * Configure swap area and related system 60 * parameter based on device(s) used. 61 */ 62 swapconf(); 63 cold = 0; 64 } 65 66 /* 67 * Configure swap space and related parameters. 68 */ 69 swapconf() 70 { 71 register struct swdevt *swp; 72 register int nblks; 73 extern int Maxmem; 74 75 for (swp = swdevt; swp->sw_dev != NODEV; swp++) 76 { 77 if ( (u_int)swp->sw_dev >= nblkdev ) break; /* XXX */ 78 if (bdevsw[major(swp->sw_dev)].d_psize) { 79 nblks = 80 (*bdevsw[major(swp->sw_dev)].d_psize)(swp->sw_dev); 81 if (nblks != -1 && 82 (swp->sw_nblks == 0 || swp->sw_nblks > nblks)) 83 swp->sw_nblks = nblks; 84 } 85 } 86 if (dumplo == 0 && bdevsw[major(dumpdev)].d_psize) 87 /*dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) - physmem;*/ 88 dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) - 89 Maxmem*NBPG/512; 90 if (dumplo < 0) 91 dumplo = 0; 92 } 93 94 #define DOSWAP /* change swdevt and dumpdev */ 95 u_long bootdev = 0; /* should be dev_t, but not until 32 bits */ 96 97 static char devname[][2] = { 98 'w','d', /* 0 = wd */ 99 's','w', /* 1 = sw */ 100 'f','d', /* 2 = fd */ 101 'w','t', /* 3 = wt */ 102 'x','d', /* 4 = xd */ 103 }; 104 105 #define PARTITIONMASK 0x7 106 #define PARTITIONSHIFT 3 107 108 /* 109 * Attempt to find the device from which we were booted. 110 * If we can do so, and not instructed not to do so, 111 * change rootdev to correspond to the load device. 112 */ 113 setroot() 114 { 115 int majdev, mindev, unit, part, adaptor; 116 dev_t temp, orootdev; 117 struct swdevt *swp; 118 119 if (boothowto & RB_DFLTROOT || 120 (bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC) 121 return; 122 majdev = (bootdev >> B_TYPESHIFT) & B_TYPEMASK; 123 if (majdev > sizeof(devname) / sizeof(devname[0])) 124 return; 125 adaptor = (bootdev >> B_ADAPTORSHIFT) & B_ADAPTORMASK; 126 part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK; 127 unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK; 128 mindev = (unit << PARTITIONSHIFT) + part; 129 orootdev = rootdev; 130 rootdev = makedev(majdev, mindev); 131 /* 132 * If the original rootdev is the same as the one 133 * just calculated, don't need to adjust the swap configuration. 134 */ 135 if (rootdev == orootdev) 136 return; 137 printf("changing root device to %c%c%d%c\n", 138 devname[majdev][0], devname[majdev][1], 139 mindev >> PARTITIONSHIFT, part + 'a'); 140 #ifdef DOSWAP 141 mindev &= ~PARTITIONMASK; 142 for (swp = swdevt; swp->sw_dev != NODEV; swp++) { 143 if (majdev == major(swp->sw_dev) && 144 mindev == (minor(swp->sw_dev) & ~PARTITIONMASK)) { 145 temp = swdevt[0].sw_dev; 146 swdevt[0].sw_dev = swp->sw_dev; 147 swp->sw_dev = temp; 148 break; 149 } 150 } 151 if (swp->sw_dev == NODEV) 152 return; 153 /* 154 * If dumpdev was the same as the old primary swap 155 * device, move it to the new primary swap device. 156 */ 157 if (temp == dumpdev) 158 dumpdev = swdevt[0].sw_dev; 159 #endif 160 } 161