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 */
63static int cpu_mainbus_match(device_t, cfdata_t, void *);
64static 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
76static int
77cpu_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
117static void
118cpu_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
125CFATTACH_DECL2_NEW(cpu_mainbus, 0,
126    cpu_mainbus_match, cpu_mainbus_attach, NULL, NULL,
127    cpu_rescan, cpu_childdetached);
128