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| author | Suzuki Poulose <suzuki@in.ibm.com> | 2012-04-15 23:48:21 +0200 |
|---|---|---|
| committer | Josh Boyer <jwboyer@gmail.com> | 2012-05-03 14:37:36 +0200 |
| commit | f13bfcc6961a5c9f511c401292db522edcd0b061 (patch) | |
| tree | 155e83bebe453ddac859a7b542e98ecc0f3f2a52 /arch/powerpc/kernel/misc_32.S | |
| parent | powerpc: Remove old powerpc specific ptrace getregs/setregs calls (diff) | |
| download | linux-f13bfcc6961a5c9f511c401292db522edcd0b061.tar.xz linux-f13bfcc6961a5c9f511c401292db522edcd0b061.zip | |
powerpc/44x: Fix/Initialize PID to kernel PID before the TLB search
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>
Diffstat (limited to 'arch/powerpc/kernel/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index 7cd07b42ca1a..d7e05d20b55c 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -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 |