aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/mips-boards/sim/sim_smp.c
blob: a9f0c2bfe4ad7b4ee63480d6ec4b88b919a80c17 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
 * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 */
/*
 * Simulator Platform-specific hooks for SMP operation
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
#include <asm/atomic.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
#ifdef CONFIG_MIPS_MT_SMTC
#include <asm/smtc_ipi.h>
#endif /* CONFIG_MIPS_MT_SMTC */

/* VPE/SMP Prototype implements platform interfaces directly */
#if !defined(CONFIG_MIPS_MT_SMP)

/*
 * Cause the specified action to be performed on a targeted "CPU"
 */

void core_send_ipi(int cpu, unsigned int action)
{
#ifdef CONFIG_MIPS_MT_SMTC
	void smtc_send_ipi(int, int, unsigned int);

	smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
#endif /* CONFIG_MIPS_MT_SMTC */
/* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */

}

/*
 * Detect available CPUs/VPEs/TCs and populate phys_cpu_present_map
 */

void __init prom_build_cpu_map(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	extern int mipsmt_build_cpu_map(int startslot);
	int nextslot;

	cpus_clear(phys_cpu_present_map);

	/* Register the boot CPU */

	smp_prepare_boot_cpu();

	/*
	 * As of November, 2004, MIPSsim only simulates one core
	 * at a time.  However, that core may be a MIPS MT core
	 * with multiple virtual processors and thread contexts.
	 */

	if (read_c0_config3() & (1<<2)) {
		nextslot = mipsmt_build_cpu_map(1);
	}
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Platform "CPU" startup hook
 */

void prom_boot_secondary(int cpu, struct task_struct *idle)
{
#ifdef CONFIG_MIPS_MT_SMTC
	extern void smtc_boot_secondary(int cpu, struct task_struct *t);

	smtc_boot_secondary(cpu, idle);
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Post-config but pre-boot cleanup entry point
 */

void prom_init_secondary(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	void smtc_init_secondary(void);

	smtc_init_secondary();
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Platform SMP pre-initialization
 */

void prom_prepare_cpus(unsigned int max_cpus)
{
#ifdef CONFIG_MIPS_MT_SMTC
	void mipsmt_prepare_cpus(int c);
	/*
	 * As noted above, we can assume a single CPU for now
	 * but it may be multithreaded.
	 */

	if (read_c0_config3() & (1<<2)) {
		mipsmt_prepare_cpus(max_cpus);
	}
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * SMP initialization finalization entry point
 */

void prom_smp_finish(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	void smtc_smp_finish(void);

	smtc_smp_finish();
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Hook for after all CPUs are online
 */

void prom_cpus_done(void)
{
#ifdef CONFIG_MIPS_MT_SMTC

#endif /* CONFIG_MIPS_MT_SMTC */
}
#endif /* CONFIG_MIPS32R2_MT_SMP */