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9b6695a8ad
A recent change requires cpu_possible_map to be initialized before
smp_sched_init() but most MIPS platforms were initializing their
processors in the prom_prepare_cpus callback of smp_prepare_cpus. The
simple fix of calling prom_prepare_cpus from one of the earlier SMP
initialization hooks doesn't work well either since IPIs may require
init_IRQ() to have completed, so bit the bullet and split
prom_prepare_cpus into two initialization functions, plat_smp_setup
which is called early from setup_arch and plat_prepare_cpus called where
prom_prepare_cpus used to be called.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
111 lines
2.8 KiB
C
111 lines
2.8 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <asm/processor.h>
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#include "cfe_api.h"
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#include "cfe_error.h"
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/*
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* Use CFE to find out how many CPUs are available, setting up
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* phys_cpu_present_map and the logical/physical mappings.
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* XXXKW will the boot CPU ever not be physical 0?
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*
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* Common setup before any secondaries are started
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*/
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void __init plat_smp_setup(void)
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{
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int i, num;
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cpus_clear(phys_cpu_present_map);
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cpu_set(0, phys_cpu_present_map);
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__cpu_number_map[0] = 0;
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__cpu_logical_map[0] = 0;
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for (i = 1, num = 0; i < NR_CPUS; i++) {
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if (cfe_cpu_stop(i) == 0) {
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cpu_set(i, phys_cpu_present_map);
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__cpu_number_map[i] = ++num;
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__cpu_logical_map[num] = i;
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}
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}
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printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
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}
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void __init plat_prepare_cpus(unsigned int max_cpus)
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{
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}
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/*
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* Setup the PC, SP, and GP of a secondary processor and start it
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* running!
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*/
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void prom_boot_secondary(int cpu, struct task_struct *idle)
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{
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int retval;
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retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap,
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__KSTK_TOS(idle),
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(unsigned long)task_thread_info(idle), 0);
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if (retval != 0)
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printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
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}
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/*
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* Code to run on secondary just after probing the CPU
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*/
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void prom_init_secondary(void)
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{
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#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
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extern void bcm1480_smp_init(void);
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bcm1480_smp_init();
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#elif defined(CONFIG_SIBYTE_SB1250)
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extern void sb1250_smp_init(void);
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sb1250_smp_init();
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#else
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#error invalid SMP configuration
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#endif
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}
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/*
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* Do any tidying up before marking online and running the idle
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* loop
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*/
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void prom_smp_finish(void)
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{
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#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
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extern void bcm1480_smp_finish(void);
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bcm1480_smp_finish();
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#elif defined(CONFIG_SIBYTE_SB1250)
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extern void sb1250_smp_finish(void);
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sb1250_smp_finish();
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#else
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#error invalid SMP configuration
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#endif
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}
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/*
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* Final cleanup after all secondaries booted
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*/
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void prom_cpus_done(void)
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{
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}
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