| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* $Id: mp.c,v 1.12 2000/08/26 02:38:03 anton Exp $ |
| 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 | } |