This patchset implements support for the MPU in our v7M cores. Support is on the same level as that for the R profile MPU: it works, but regions smaller than 1K in size are not supported. It likely has some missing corner-case features.
The patchset can be divided into three parts: * patches 1..3 are the RFC I sent out yesterday which refactors the mmuidx handling so that M profile can use different semantics for the mmu indexes (only very minor change to the RFC: I used some symbolic constants rather than hardcoding masks with 7 and ~7, tweaked a few expressions, etc) * patches 4..7 clean up our handling of whether the MPU exists or not, since we weren't consistent about whether ARM_FEATURE_MPU meant "PMSA, not VMSA" or "PMSA and MPU is present". We rename the feature bit to ARM_FEATURE_PMSA and use the has_mpu flag to indicate whether a PMSA core has an MPU implemented or not * patches 8..13 implement the MPU support proper. Most of this is Michael Davidsaver's code, but I've tidied it up, fixed a few bugs, and reimplemented the HFNMIENA support Testing has been light -- I have a few basic MPU tests at https://git.linaro.org/people/peter.maydell/m-profile-tests.git but otherwise don't have anything to hand that exercises the MPU. I wanted to get this patchset out to the list before I go off on my break; I will come back and follow up on review comments when I get back in June. thanks -- PMM Michael Davidsaver (4): armv7m: Improve "-d mmu" tracing for PMSAv7 MPU armv7m: Implement M profile default memory map armv7m: Classify faults as MemManage or BusFault arm: add MPU support to M profile CPUs Peter Maydell (9): arm: Use the mmu_idx we're passed in arm_cpu_do_unaligned_access() arm: Add support for M profile CPUs having different MMU index semantics arm: Use different ARMMMUIdx values for M profile arm: Clean up handling of no-MPU PMSA CPUs arm: Don't clear ARM_FEATURE_PMSA for no-mpu configs arm: Don't let no-MPU PMSA cores write to SCTLR.M arm: Remove unnecessary check on cpu->pmsav7_dregion arm: All M profile cores are PMSA arm: Implement HFNMIENA support for M profile MPU target/arm/cpu.h | 118 ++++++++++++++-- target/arm/translate.h | 2 +- hw/intc/armv7m_nvic.c | 104 ++++++++++++++ target/arm/cpu.c | 26 +++- target/arm/helper.c | 332 +++++++++++++++++++++++++++++++-------------- target/arm/machine.c | 7 +- target/arm/op_helper.c | 3 +- target/arm/translate-a64.c | 18 ++- target/arm/translate.c | 14 +- 9 files changed, 484 insertions(+), 140 deletions(-) -- 2.7.4
