2 * Copyright (c) 2001 Wind River Systems, Inc.
4 * Written by: John Baldwin <jhb@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the author nor the names of any co-contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * This module provides MI support for per-cpu data.
34 * Each architecture determines the mapping of logical CPU IDs to physical
35 * CPUs. The requirements of this mapping are as follows:
36 * - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1.
37 * - The mapping is not required to be dense. That is, there may be
38 * gaps in the mappings.
39 * - The platform sets the value of MAXCPU in <machine/param.h>.
40 * - It is suggested, but not required, that in the non-SMP case, the
41 * platform define MAXCPU to be 1 and define the logical ID of the
45 #include <sys/cdefs.h>
46 __FBSDID("$FreeBSD$");
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/linker_set.h>
58 static struct pcpu *cpuid_to_pcpu[MAXCPU];
59 struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead);
62 * Initialize the MI portions of a struct pcpu.
65 pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
69 KASSERT(cpuid >= 0 && cpuid < MAXCPU,
70 ("pcpu_init: invalid cpuid %d", cpuid));
71 pcpu->pc_cpuid = cpuid;
72 pcpu->pc_cpumask = 1 << cpuid;
73 cpuid_to_pcpu[cpuid] = pcpu;
74 SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu);
75 cpu_pcpu_init(pcpu, cpuid, size);
79 * Destroy a struct pcpu.
82 pcpu_destroy(struct pcpu *pcpu)
85 SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu);
86 cpuid_to_pcpu[pcpu->pc_cpuid] = NULL;
90 * Locate a struct pcpu by cpu id.
93 pcpu_find(u_int cpuid)
96 return (cpuid_to_pcpu[cpuid]);
100 DB_SHOW_COMMAND(pcpu, db_show_pcpu)
107 id = ((addr >> 4) % 16) * 10 + (addr % 16);
109 id = PCPU_GET(cpuid);
112 db_printf("CPU %d not found\n", id);
115 db_printf("cpuid = %d\n", pc->pc_cpuid);
116 db_printf("curthread = ");
117 td = pc->pc_curthread;
119 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
120 td->td_proc->p_comm);
123 db_printf("curpcb = %p\n", pc->pc_curpcb);
124 db_printf("fpcurthread = ");
125 td = pc->pc_fpcurthread;
127 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
128 td->td_proc->p_comm);
131 db_printf("idlethread = ");
132 td = pc->pc_idlethread;
134 db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid,
135 td->td_proc->p_comm);
141 db_printf("spin locks held:\n");
142 witness_list_locks(&pc->pc_spinlocks);