leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

powerpc/44x: Fix/Initialize PID to kernel PID before the TLB search

Browse Source 
Initialize the PID register with kernel pid (0) before we start
setting the TLB mapping for KEXEC. Also set the MMUCR[TID] to kernel
PID.

This was spotted while testing the kexec on ISS for 47x. ISS  doesn't
return a successful tlbsx for a kernel address with PID set to a user PID.
Though the hardware/qemu/simics work fine.

This patch is harmless and initializes the PID to 0 (kernel PID) which
is usually the case during a normal kernel boot. This would fix the kexec
on ISS for 440. I have tested this patch on sequoia board.

Signed-off-by: Suzuki K Poulose <suzuki@in.ibm.com>
Cc: Josh Boyer <jwboyer@gmail.com>
Signed-off-by: Josh Boyer <jwboyer@gmail.com>
This commit is contained in:
Suzuki Poulose 2012-04-15 21:48:21 +00:00 committed by Josh Boyer
parent ec34a68149
commit f13bfcc696
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/kernel/misc_32.S
View File

@ -761,8 +761,12 @@ relocate_new_kernel:
mr r30, r4
mr r31, r5
/* Load our MSR_IS and TID to MMUCR for TLB search */
mfspr r3,SPRN_PID
/*
* Load the PID with kernel PID (0).
* Also load our MSR_IS and TID to MMUCR for TLB search.
*/
li r3, 0
mtspr SPRN_PID, r3
mfmsr r4
andi. r4,r4,MSR_IS@l
beq wmmucr