diff options
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index e28a76bd..84e4816 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -749,6 +749,22 @@ config ARM_ERRATA_411920 It does not affect the MPCore. This option enables the ARM Ltd. recommended workaround. +config ARM_ERRATA_430973 + bool "ARM errata: Stale prediction on replaced interworking branch" + depends on CPU_V7 + help + This option enables the workaround for the 430973 Cortex-A8 + (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb + interworking branch is replaced with another code sequence at the + same virtual address, whether due to self-modifying code or virtual + to physical address re-mapping, Cortex-A8 does not recover from the + stale interworking branch prediction. This results in Cortex-A8 + executing the new code sequence in the incorrect ARM or Thumb state. + The workaround enables the BTB/BTAC operations by setting ACTLR.IBE + and also flushes the branch target cache at every context switch. + Note that setting specific bits in the ACTLR register may not be + available in non-secure mode. + endmenu source "arch/arm/common/Kconfig" |
