mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 08:31:55 +00:00
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
/*
|
|
* Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/smp.h>
|
|
#include <asm/processor.h>
|
|
|
|
#include "cfe_api.h"
|
|
#include "cfe_error.h"
|
|
|
|
/*
|
|
* Use CFE to find out how many CPUs are available, setting up
|
|
* phys_cpu_present_map and the logical/physical mappings.
|
|
* XXXKW will the boot CPU ever not be physical 0?
|
|
*
|
|
* Common setup before any secondaries are started
|
|
*/
|
|
void __init plat_smp_setup(void)
|
|
{
|
|
int i, num;
|
|
|
|
cpus_clear(phys_cpu_present_map);
|
|
cpu_set(0, phys_cpu_present_map);
|
|
__cpu_number_map[0] = 0;
|
|
__cpu_logical_map[0] = 0;
|
|
|
|
for (i = 1, num = 0; i < NR_CPUS; i++) {
|
|
if (cfe_cpu_stop(i) == 0) {
|
|
cpu_set(i, phys_cpu_present_map);
|
|
__cpu_number_map[i] = ++num;
|
|
__cpu_logical_map[num] = i;
|
|
}
|
|
}
|
|
printk(KERN_INFO "Detected %i available secondary CPU(s)\n", num);
|
|
}
|
|
|
|
void __init plat_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* Setup the PC, SP, and GP of a secondary processor and start it
|
|
* running!
|
|
*/
|
|
void prom_boot_secondary(int cpu, struct task_struct *idle)
|
|
{
|
|
int retval;
|
|
|
|
retval = cfe_cpu_start(cpu_logical_map(cpu), &smp_bootstrap,
|
|
__KSTK_TOS(idle),
|
|
(unsigned long)task_thread_info(idle), 0);
|
|
if (retval != 0)
|
|
printk("cfe_start_cpu(%i) returned %i\n" , cpu, retval);
|
|
}
|
|
|
|
/*
|
|
* Code to run on secondary just after probing the CPU
|
|
*/
|
|
void prom_init_secondary(void)
|
|
{
|
|
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
|
|
extern void bcm1480_smp_init(void);
|
|
bcm1480_smp_init();
|
|
#elif defined(CONFIG_SIBYTE_SB1250)
|
|
extern void sb1250_smp_init(void);
|
|
sb1250_smp_init();
|
|
#else
|
|
#error invalid SMP configuration
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Do any tidying up before marking online and running the idle
|
|
* loop
|
|
*/
|
|
void prom_smp_finish(void)
|
|
{
|
|
#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
|
|
extern void bcm1480_smp_finish(void);
|
|
bcm1480_smp_finish();
|
|
#elif defined(CONFIG_SIBYTE_SB1250)
|
|
extern void sb1250_smp_finish(void);
|
|
sb1250_smp_finish();
|
|
#else
|
|
#error invalid SMP configuration
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Final cleanup after all secondaries booted
|
|
*/
|
|
void prom_cpus_done(void)
|
|
{
|
|
}
|