1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Smp support for CHRP machines. 4 * 5 * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great 6 * deal of code from the sparc and intel versions. 7 * 8 * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu> 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/sched.h> 14 #include <linux/smp.h> 15 #include <linux/interrupt.h> 16 #include <linux/kernel_stat.h> 17 #include <linux/delay.h> 18 #include <linux/spinlock.h> 19 20 #include <asm/ptrace.h> 21 #include <linux/atomic.h> 22 #include <asm/irq.h> 23 #include <asm/page.h> 24 #include <asm/pgtable.h> 25 #include <asm/sections.h> 26 #include <asm/io.h> 27 #include <asm/prom.h> 28 #include <asm/smp.h> 29 #include <asm/machdep.h> 30 #include <asm/mpic.h> 31 #include <asm/rtas.h> 32 33 static int smp_chrp_kick_cpu(int nr) 34 { 35 *(unsigned long *)KERNELBASE = nr; 36 asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory"); 37 38 return 0; 39 } 40 41 static void smp_chrp_setup_cpu(int cpu_nr) 42 { 43 mpic_setup_this_cpu(); 44 } 45 46 /* CHRP with openpic */ 47 struct smp_ops_t chrp_smp_ops = { 48 .cause_nmi_ipi = NULL, 49 .message_pass = smp_mpic_message_pass, 50 .probe = smp_mpic_probe, 51 .kick_cpu = smp_chrp_kick_cpu, 52 .setup_cpu = smp_chrp_setup_cpu, 53 .give_timebase = rtas_give_timebase, 54 .take_timebase = rtas_take_timebase, 55 }; 56