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
cpu_mainbus_match(device_t parent,cfdata_t cf,void * aux)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
cpu_mainbus_attach(device_t parent,device_t self,void * aux)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