brain-hackers_pepepper-mirror/u-boot-brain
1
0
Fork 0
mirror of https://github.com/brain-hackers/u-boot-brain synced 2024-06-09 23:36:03 +09:00
Code Issues Projects Releases Wiki Activity

armv8: fsl-layerscape: Fix "cpu release" command

Browse Source 
When one core is released, other cores may not have valid entry
address. Those cores are trapped by "wfe" and wait for further
instruction. When their address is set, they need to be kicked
off by "sev".

Signed-off-by: York Sun <yorksun@freescale.com>
This commit is contained in:
York Sun 2015-11-12 12:38:21 -08:00
parent da305b9f57
commit 1f6236f06b
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm/cpu/armv8/fsl-layerscape/mp.c
View File

@ -192,6 +192,12 @@ int cpu_release(int nr, int argc, char * const argv[])
(unsigned long)table + SPIN_TABLE_ELEM_SIZE);
asm volatile("dsb st");
smp_kick_all_cpus(); /* only those with entry addr set will run */
/*
* When the first release command runs, all cores are set to go. Those
* without a valid entry address will be trapped by "wfe". "sev" kicks
* them off to check the address again. When set, they continue to run.
*/
asm volatile("sev");
return 0;
}