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Commit 72ede9b1 authored by Atsushi Nemoto's avatar Atsushi Nemoto Committed by Ralf Baechle
Browse files

[MIPS] Qemu: Fix Symmetric Uniprocessor support. 



Might be useful for SMP debugging.

Signed-off-by: default avatarAtsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>

[Rewritten Kconfig bits to deal better fit in the usual pattern of doing
things - Ralf]

Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 8c364435

arch/mips/Kconfig

+12 −3
Original line number Diff line number Diff line
@@ -542,6 +542,8 @@ config QEMU 
	select SYS_SUPPORTS_LITTLE_ENDIAN

	select ARCH_SPARSEMEM_ENABLE

	select GENERIC_HARDIRQS_NO__DO_IRQ

	select NR_CPUS_DEFAULT_1

	select SYS_SUPPORTS_SMP

	help

	  Qemu is a software emulator which among other architectures also

	  can simulate a MIPS32 4Kc system.  This patch adds support for the
@@ -1805,6 +1807,9 @@ config SMP 
config SYS_SUPPORTS_SMP

	bool



config NR_CPUS_DEFAULT_1

	bool



config NR_CPUS_DEFAULT_2

	bool
@@ -1825,8 +1830,9 @@ config NR_CPUS_DEFAULT_64 


config NR_CPUS

	int "Maximum number of CPUs (2-64)"

	range 2 64

	range 1 64 if NR_CPUS_DEFAULT_1

	depends on SMP

	default "1" if NR_CPUS_DEFAULT_1

	default "2" if NR_CPUS_DEFAULT_2

	default "4" if NR_CPUS_DEFAULT_4

	default "8" if NR_CPUS_DEFAULT_8
@@ -1837,10 +1843,13 @@ config NR_CPUS 
	  This allows you to specify the maximum number of CPUs which this

	  kernel will support.  The maximum supported value is 32 for 32-bit

	  kernel and 64 for 64-bit kernels; the minimum value which makes

	  sense is 2.

	  sense is 1 for Qemu (useful only for kernel debugging purposes)

	  and 2 for all others.



	  This is purely to save memory - each supported CPU adds

	  approximately eight kilobytes to the kernel image.

	  approximately eight kilobytes to the kernel image.  For best

	  performance should round up your number of processors to the next

	  power of two.



#

# Timer Interrupt Frequency Configuration

arch/mips/qemu/q-smp.c

+7 −0
Original line number Diff line number Diff line
@@ -46,3 +46,10 @@ void __init prom_prepare_cpus(unsigned int max_cpus) 
void prom_boot_secondary(int cpu, struct task_struct *idle)

{

}



void __init plat_smp_setup(void)

{

}

void __init plat_prepare_cpus(unsigned int max_cpus)

{

}