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[MIPS] Qemu: Fix Symmetric Uniprocessor support. 

Might be useful for SMP debugging.

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

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

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Atsushi Nemoto 2007-03-18 01:01:39 +09:00 committed by Ralf Baechle
parent 8c3644350f
commit 72ede9b189
2 changed files with 19 additions and 3 deletions
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15
arch/mips/Kconfig
View File

@ -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

7
arch/mips/qemu/q-smp.c
View File

@ -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)
{
}