Commit | Line | Data |
---|---|---|
88278ca2 | 1 | /* |
1da177e4 LT |
2 | * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call |
3 | * these on a UP or else you will halt and catch fire. ;) | |
4 | * | |
5 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) | |
6 | */ | |
7 | ||
8 | #include <linux/types.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/sched.h> | |
11 | ||
12 | #include <asm/openprom.h> | |
13 | #include <asm/oplib.h> | |
14 | ||
15 | extern void restore_current(void); | |
16 | ||
17 | /* Start cpu with prom-tree node 'cpunode' using context described | |
18 | * by 'ctable_reg' in context 'ctx' at program counter 'pc'. | |
19 | * | |
20 | * XXX Have to look into what the return values mean. XXX | |
21 | */ | |
22 | int | |
23 | prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc) | |
24 | { | |
25 | int ret; | |
26 | unsigned long flags; | |
27 | ||
28 | spin_lock_irqsave(&prom_lock, flags); | |
29 | switch(prom_vers) { | |
30 | case PROM_V0: | |
31 | case PROM_V2: | |
32 | default: | |
33 | ret = -1; | |
34 | break; | |
35 | case PROM_V3: | |
36 | ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc); | |
37 | break; | |
38 | }; | |
39 | restore_current(); | |
40 | spin_unlock_irqrestore(&prom_lock, flags); | |
41 | ||
42 | return ret; | |
43 | } | |
44 | ||
45 | /* Stop CPU with device prom-tree node 'cpunode'. | |
46 | * XXX Again, what does the return value really mean? XXX | |
47 | */ | |
48 | int | |
49 | prom_stopcpu(int cpunode) | |
50 | { | |
51 | int ret; | |
52 | unsigned long flags; | |
53 | ||
54 | spin_lock_irqsave(&prom_lock, flags); | |
55 | switch(prom_vers) { | |
56 | case PROM_V0: | |
57 | case PROM_V2: | |
58 | default: | |
59 | ret = -1; | |
60 | break; | |
61 | case PROM_V3: | |
62 | ret = (*(romvec->v3_cpustop))(cpunode); | |
63 | break; | |
64 | }; | |
65 | restore_current(); | |
66 | spin_unlock_irqrestore(&prom_lock, flags); | |
67 | ||
68 | return ret; | |
69 | } | |
70 | ||
71 | /* Make CPU with device prom-tree node 'cpunode' idle. | |
72 | * XXX Return value, anyone? XXX | |
73 | */ | |
74 | int | |
75 | prom_idlecpu(int cpunode) | |
76 | { | |
77 | int ret; | |
78 | unsigned long flags; | |
79 | ||
80 | spin_lock_irqsave(&prom_lock, flags); | |
81 | switch(prom_vers) { | |
82 | case PROM_V0: | |
83 | case PROM_V2: | |
84 | default: | |
85 | ret = -1; | |
86 | break; | |
87 | case PROM_V3: | |
88 | ret = (*(romvec->v3_cpuidle))(cpunode); | |
89 | break; | |
90 | }; | |
91 | restore_current(); | |
92 | spin_unlock_irqrestore(&prom_lock, flags); | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | /* Resume the execution of CPU with nodeid 'cpunode'. | |
98 | * XXX Come on, somebody has to know... XXX | |
99 | */ | |
100 | int | |
101 | prom_restartcpu(int cpunode) | |
102 | { | |
103 | int ret; | |
104 | unsigned long flags; | |
105 | ||
106 | spin_lock_irqsave(&prom_lock, flags); | |
107 | switch(prom_vers) { | |
108 | case PROM_V0: | |
109 | case PROM_V2: | |
110 | default: | |
111 | ret = -1; | |
112 | break; | |
113 | case PROM_V3: | |
114 | ret = (*(romvec->v3_cpuresume))(cpunode); | |
115 | break; | |
116 | }; | |
117 | restore_current(); | |
118 | spin_unlock_irqrestore(&prom_lock, flags); | |
119 | ||
120 | return ret; | |
121 | } |