summaryrefslogtreecommitdiff
path: root/arch/sparc/prom/mp.c
blob: 92fe3739fdb82f2044e64deb6f508374af963941 (plain)
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
/* $Id: mp.c,v 1.12 2000/08/26 02:38:03 anton Exp $
 * mp.c:  OpenBoot Prom Multiprocessor support routines.  Don't call
 *        these on a UP or else you will halt and catch fire. ;)
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>

#include <asm/openprom.h>
#include <asm/oplib.h>

extern void restore_current(void);

/* Start cpu with prom-tree node 'cpunode' using context described
 * by 'ctable_reg' in context 'ctx' at program counter 'pc'.
 *
 * XXX Have to look into what the return values mean. XXX
 */
int
prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&prom_lock, flags);
	switch(prom_vers) {
	case PROM_V0:
	case PROM_V2:
	default:
		ret = -1;
		break;
	case PROM_V3:
		ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc);
		break;
	};
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return ret;
}

/* Stop CPU with device prom-tree node 'cpunode'.
 * XXX Again, what does the return value really mean? XXX
 */
int
prom_stopcpu(int cpunode)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&prom_lock, flags);
	switch(prom_vers) {
	case PROM_V0:
	case PROM_V2:
	default:
		ret = -1;
		break;
	case PROM_V3:
		ret = (*(romvec->v3_cpustop))(cpunode);
		break;
	};
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return ret;
}

/* Make CPU with device prom-tree node 'cpunode' idle.
 * XXX Return value, anyone? XXX
 */
int
prom_idlecpu(int cpunode)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&prom_lock, flags);
	switch(prom_vers) {
	case PROM_V0:
	case PROM_V2:
	default:
		ret = -1;
		break;
	case PROM_V3:
		ret = (*(romvec->v3_cpuidle))(cpunode);
		break;
	};
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return ret;
}

/* Resume the execution of CPU with nodeid 'cpunode'.
 * XXX Come on, somebody has to know... XXX
 */
int
prom_restartcpu(int cpunode)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&prom_lock, flags);
	switch(prom_vers) {
	case PROM_V0:
	case PROM_V2:
	default:
		ret = -1;
		break;
	case PROM_V3:
		ret = (*(romvec->v3_cpuresume))(cpunode);
		break;
	};
	restore_current();
	spin_unlock_irqrestore(&prom_lock, flags);

	return ret;
}