CONFIG_ARM_ERRATA_430973: ARM errata: Stale prediction on replaced interworking branch

General informations

The Linux kernel configuration item CONFIG_ARM_ERRATA_430973:

• prompt: ARM errata: Stale prediction on replaced interworking branch
• type: bool
• depends on: CONFIG_CPU_V7
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.6.30–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11, 6.12-rc+HEAD

Help text

This option enables the workaround for the 430973 Cortex-A8 r1p* 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.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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