Linux Kernel  3.7.1
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platsmp.c
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1 /*
2  * Copyright 2010-2011 Calxeda, Inc.
3  * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program. If not, see <http://www.gnu.org/licenses/>.
16  */
17 #include <linux/init.h>
18 #include <linux/smp.h>
19 #include <linux/io.h>
20 
21 #include <asm/smp_scu.h>
22 #include <asm/hardware/gic.h>
23 
24 #include "core.h"
25 
26 extern void secondary_startup(void);
27 
28 static void __cpuinit highbank_secondary_init(unsigned int cpu)
29 {
31 }
32 
33 static int __cpuinit highbank_boot_secondary(unsigned int cpu, struct task_struct *idle)
34 {
36  return 0;
37 }
38 
39 /*
40  * Initialise the CPU possible map early - this describes the CPUs
41  * which may be present or become present in the system.
42  */
43 static void __init highbank_smp_init_cpus(void)
44 {
45  unsigned int i, ncores;
46 
48 
49  /* sanity check */
50  if (ncores > NR_CPUS) {
52  "highbank: no. of cores (%d) greater than configured "
53  "maximum of %d - clipping\n",
54  ncores, NR_CPUS);
55  ncores = NR_CPUS;
56  }
57 
58  for (i = 0; i < ncores; i++)
59  set_cpu_possible(i, true);
60 
62 }
63 
64 static void __init highbank_smp_prepare_cpus(unsigned int max_cpus)
65 {
66  int i;
67 
69 
70  /*
71  * Write the address of secondary startup into the jump table
72  * The cores are in wfi and wait until they receive a soft interrupt
73  * and a non-zero value to jump to. Then the secondary CPU branches
74  * to this address.
75  */
76  for (i = 1; i < max_cpus; i++)
78 }
79 
81  .smp_init_cpus = highbank_smp_init_cpus,
82  .smp_prepare_cpus = highbank_smp_prepare_cpus,
83  .smp_secondary_init = highbank_secondary_init,
84  .smp_boot_secondary = highbank_boot_secondary,
85 #ifdef CONFIG_HOTPLUG_CPU
86  .cpu_die = highbank_cpu_die,
87 #endif
88 };