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      1 /*	$NetBSD: cpu_mainbus.c,v 1.19 2024/05/09 12:41:08 pho Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Mark Brinicombe.
      5  * Copyright (c) 1995 Brini.
      6  * All rights reserved.
      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 Brini.
     19  * 4. The name of the company nor the name of the author may be used to
     20  *    endorse or promote products derived from this software without specific
     21  *    prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
     24  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     26  * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     27  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     28  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     29  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  * RiscBSD kernel project
     36  *
     37  * cpu.c
     38  *
     39  * Probing and configuration for the master cpu
     40  *
     41  * Created      : 10/10/95
     42  */
     43 
     44 #include "locators.h"
     45 #include "opt_multiprocessor.h"
     46 
     47 #include <sys/cdefs.h>
     48 __KERNEL_RCSID(0, "$NetBSD: cpu_mainbus.c,v 1.19 2024/05/09 12:41:08 pho Exp $");
     49 
     50 #include <sys/param.h>
     51 #include <sys/types.h>
     52 #include <sys/systm.h>
     53 #include <sys/cpu.h>
     54 #include <sys/device.h>
     55 #include <sys/proc.h>
     56 
     57 #include <arm/cpuvar.h>
     58 #include <arm/mainbus/mainbus.h>
     59 
     60 /*
     61  * Prototypes
     62  */
     63 static int cpu_mainbus_match(device_t, cfdata_t, void *);
     64 static void cpu_mainbus_attach(device_t, device_t, void *);
     65 
     66 /*
     67  * int cpumatch(device_t parent, cfdata_t cf, void *aux)
     68  *
     69  * Probe for the main cpu. Currently all this does is return 1 to
     70  * indicate that the cpu was found.
     71  */
     72 #ifndef MULTIPROCESSOR
     73 #define	arm_cpu_max		1
     74 #endif
     75 
     76 static int
     77 cpu_mainbus_match(device_t parent, cfdata_t cf, void *aux)
     78 {
     79 	struct mainbus_attach_args * const mb = aux;
     80 	int id = mb->mb_core;
     81 
     82 	if (id != MAINBUSCF_CORE_DEFAULT) {
     83 		if (id == 0)
     84 			return cpu_info_store[0].ci_dev == NULL;
     85 		if (id >= arm_cpu_max)
     86 			return 0;
     87 #ifdef MULTIPROCESSOR
     88 		if (cpu_info[id] != NULL)
     89 			return 0;
     90 #endif
     91 		return 1;
     92 	}
     93 
     94 	if (cpu_info_store[0].ci_dev == NULL) {
     95 		mb->mb_core = 0;
     96 		return 1;
     97 	}
     98 
     99 #ifdef MULTIPROCESSOR
    100 	for (id = 1; id < arm_cpu_max; id++) {
    101 		if (cpu_info[id] != NULL)
    102 			continue;
    103 		mb->mb_core = id;
    104 		return 1;
    105 	}
    106 #endif
    107 
    108 	return 0;
    109 }
    110 
    111 /*
    112  * void cpusattach(device_t parent, device_t dev, void *aux)
    113  *
    114  * Attach the main cpu
    115  */
    116 
    117 static void
    118 cpu_mainbus_attach(device_t parent, device_t self, void *aux)
    119 {
    120 	struct mainbus_attach_args * const mb = aux;
    121 
    122 	cpu_attach(self, mb->mb_core);
    123 }
    124 
    125 CFATTACH_DECL2_NEW(cpu_mainbus, 0,
    126     cpu_mainbus_match, cpu_mainbus_attach, NULL, NULL,
    127     cpu_rescan, cpu_childdetached);
    128