cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mp.c (1024B)

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