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      1 /* $NetBSD: mainbus.c,v 1.37 2021/08/07 16:18:40 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: mainbus.c,v 1.37 2021/08/07 16:18:40 thorpej Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/device.h>
     37 #include <sys/reboot.h>
     38 #include <sys/conf.h>
     39 
     40 #include <machine/alpha.h>
     41 #include <machine/autoconf.h>
     42 #include <machine/rpb.h>
     43 #include <machine/cpuconf.h>
     44 
     45 /* Definition of the mainbus driver. */
     46 static int	mbmatch(device_t, cfdata_t, void *);
     47 static void	mbattach(device_t, device_t, void *);
     48 static int	mbprint(void *, const char *);
     49 
     50 CFATTACH_DECL_NEW(mainbus, 0, mbmatch, mbattach, NULL, NULL);
     51 
     52 /* There can be only one. */
     53 int	mainbus_found;
     54 
     55 static int
     56 mbmatch(device_t parent, cfdata_t cf, void *aux)
     57 {
     58 
     59 	if (mainbus_found)
     60 		return (0);
     61 
     62 	return (1);
     63 }
     64 
     65 static void
     66 mbattach(device_t parent, device_t self, void *aux)
     67 {
     68 	struct mainbus_attach_args ma;
     69 	struct pcs *pcsp;
     70 	int i, cpuattachcnt;
     71 	extern int ncpus;
     72 
     73 	mainbus_found = 1;
     74 
     75 	printf("\n");
     76 
     77 	/*
     78 	 * Try to find and attach all of the CPUs in the machine.
     79 	 */
     80 	cpuattachcnt = 0;
     81 	for (i = 0; i < hwrpb->rpb_pcs_cnt; i++) {
     82 		pcsp = LOCATE_PCS(hwrpb, i);
     83 		if ((pcsp->pcs_flags & PCS_PP) == 0)
     84 			continue;
     85 
     86 		ma.ma_name = "cpu";
     87 		ma.ma_slot = i;
     88 		if (config_found(self, &ma, mbprint, CFARGS_NONE) != NULL)
     89 			cpuattachcnt++;
     90 	}
     91 	if (ncpus != cpuattachcnt)
     92 		printf("WARNING: %d cpus in machine, %d attached\n",
     93 			ncpus, cpuattachcnt);
     94 
     95 	/* Patch-up any routines based on architecture features. */
     96 	alpha_patch(false);
     97 
     98 	if (alpha_is_qemu) {
     99 		ma.ma_name = "qemu";
    100 		ma.ma_slot = 0;			/* meaningless */
    101 		config_found(self, &ma, mbprint, CFARGS_NONE);
    102 	}
    103 
    104 	if (platform.iobus != NULL) {
    105 		ma.ma_name = platform.iobus;
    106 		ma.ma_slot = 0;			/* meaningless */
    107 		config_found(self, &ma, mbprint, CFARGS_NONE);
    108 	}
    109 }
    110 
    111 static int
    112 mbprint(void *aux, const char *pnp)
    113 {
    114 	struct mainbus_attach_args *ma = aux;
    115 
    116 	if (pnp)
    117 		aprint_normal("%s at %s", ma->ma_name, pnp);
    118 
    119 	return (UNCONF);
    120 }
    121