| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * mp.c: OpenBoot Prom Multiprocessor support routines. Don't call |
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| 4 | * these on a UP or else you will halt and catch fire. ;) |
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| 5 | * |
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| 6 | * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
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| 7 | */ |
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| 8 | |
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| 9 | #include <linux/types.h> |
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| 10 | #include <linux/kernel.h> |
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| 11 | #include <linux/sched.h> |
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| 12 | |
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| 13 | #include <asm/openprom.h> |
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| 14 | #include <asm/oplib.h> |
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| 15 | |
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| 16 | extern void restore_current(void); |
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| 17 | |
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| 18 | /* Start cpu with prom-tree node 'cpunode' using context described |
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| 19 | * by 'ctable_reg' in context 'ctx' at program counter 'pc'. |
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| 20 | * |
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| 21 | * XXX Have to look into what the return values mean. XXX |
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| 22 | */ |
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| 23 | int |
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| 24 | prom_startcpu(int cpunode, struct linux_prom_registers *ctable_reg, int ctx, char *pc) |
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| 25 | { |
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| 26 | int ret; |
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| 27 | unsigned long flags; |
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| 28 | |
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| 29 | spin_lock_irqsave(&prom_lock, flags); |
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| 30 | switch(prom_vers) { |
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| 31 | case PROM_V0: |
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| 32 | case PROM_V2: |
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| 33 | default: |
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| 34 | ret = -1; |
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| 35 | break; |
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| 36 | case PROM_V3: |
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| 37 | ret = (*(romvec->v3_cpustart))(cpunode, (int) ctable_reg, ctx, pc); |
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| 38 | break; |
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| 39 | } |
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| 40 | restore_current(); |
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| 41 | spin_unlock_irqrestore(lock: &prom_lock, flags); |
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| 42 | |
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| 43 | return ret; |
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| 44 | } |
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| 45 | |
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