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powerpc/fsl_booke: Add support to boot from core other than 0 

First we check to see if we are the first core booting up. This
is accomplished by comparing the boot_cpuid with -1, if it is we
assume this is the first core coming up.

Secondly, we need to update the initial thread info structure
to reflect the actual cpu we are running on otherwise
smp_processor_id() and related functions will return the default
initialization value of the struct or 0.

Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
hifive-unleashed-5.1
Matthew McClintock 2010-08-31 18:24:45 -05:00 committed by Kumar Gala
parent f7a07fd961
commit 2ed38b2359
2 changed files with 9 additions and 3 deletions
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10
arch/powerpc/kernel/head_fsl_booke.S
View File

@ -152,8 +152,11 @@ _ENTRY(__early_start)
/* Check to see if we're the second processor, and jump
* to the secondary_start code if so
*/
mfspr r24,SPRN_PIR
cmpwi r24,0
lis r24, boot_cpuid@h
ori r24, r24, boot_cpuid@l
lwz r24, 0(r24)
cmpwi r24, -1
mfspr r24,SPRN_PIR
bne __secondary_start
#endif
@ -175,6 +178,9 @@ _ENTRY(__early_start)
li r0,0
stwu r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
rlwinm r22,r1,0,0,31-THREAD_SHIFT /* current thread_info */
stw r24, TI_CPU(r22)
bl early_init
#ifdef CONFIG_RELOCATABLE

2
arch/powerpc/kernel/setup_32.c
View File

@ -46,7 +46,7 @@
extern void bootx_init(unsigned long r4, unsigned long phys);
int boot_cpuid;
int boot_cpuid = -1;
EXPORT_SYMBOL_GPL(boot_cpuid);
int boot_cpuid_phys;