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Commit c1449c8f authored by Ralf Baechle's avatar Ralf Baechle
Browse files

[MIPS] Symmetric Uniprocessor support for Qemu. 


    
SMP bits needed to builds and run an SMP kernel.  While only a single
processor is supported ATM it's still useful for some SMP debugging using
Qemu.
    
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 37caa934

arch/mips/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -1582,7 +1582,7 @@ source "mm/Kconfig" 


config SMP

	bool "Multi-Processing support"

	depends on CPU_RM9000 || ((SIBYTE_BCM1x80 || SIBYTE_BCM1x55 || SIBYTE_SB1250) && !SIBYTE_STANDALONE) || SGI_IP27 || MIPS_MT_SMP

	depends on CPU_RM9000 || ((SIBYTE_BCM1x80 || SIBYTE_BCM1x55 || SIBYTE_SB1250 || QEMU) && !SIBYTE_STANDALONE) || SGI_IP27 || MIPS_MT_SMP

	---help---

	  This enables support for systems with more than one CPU. If you have

	  a system with only one CPU, like most personal computers, say N. If

arch/mips/qemu/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -3,3 +3,5 @@ 
#



obj-y		= q-firmware.o q-int.o q-irq.o q-mem.o q-setup.o



obj-$(CONFIG_SMP) += q-smp.o

arch/mips/qemu/q-smp.c

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+48 −0
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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2006 by Ralf Baechle (ralf@linux-mips.org)

 *

 * Symmetric Uniprocessor (TM) Support

 */

#include <linux/kernel.h>

#include <linux/sched.h>



/*

 * Send inter-processor interrupt

 */

void core_send_ipi(int cpu, unsigned int action)

{

	panic(KERN_ERR "%s called", __FUNCTION__);

}



/*

 *  After we've done initial boot, this function is called to allow the

 *  board code to clean up state, if needed

 */

void prom_init_secondary(void)

{

}



void prom_smp_finish(void)

{

}



/* Hook for after all CPUs are online */

void prom_cpus_done(void)

{

}



void __init prom_prepare_cpus(unsigned int max_cpus)

{

	cpus_clear(phys_cpu_present_map);

}



/*

 * Firmware CPU startup hook

 */

void prom_boot_secondary(int cpu, struct task_struct *idle)

{

}