armv8-r: Add Arm Cortex-R82 non-MPU port #1289
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Hi @AhmedIsmail02, Apologies for the late response. I will reach out to someone with a bit more familiarity with this architecture (and has a board to test) to take a look. Best, Jason Carroll |
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Hi @jasonpcarroll, Thanks for getting back to me. Sure, you can refer them to use the example available here which runs on Arm's FVP. |
portable/GCC/ARM_CR82/port.c
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| uint64_t ullPortInterruptNestings[ configNUMBER_OF_CORES ] = { 0 }; | ||
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| /* Flag to control tick ISR handling, this is made true just before schedular start. */ | ||
| __attribute__( ( section( ".shared_ram" ) ) ) |
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Why does it need to be placed in shared_ram section?
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That's not needed anymore as the port assumes that the hardware or target model is fully cache coherent. Hence, it's now removed.
The goal of this commit is to add the GCC/ARMClang non-MPU port variant for ARM Cortex-R82 processor which is ARMv8-R AArch64 based. The work done is inspired by the GCC ARM_AARCH64 FreeRTOS port. This port has the following features: * Uses single security state (non TrustZone). * Supports SMP (Symmetric multi-processing). * Doesn't support Hypervisor (EL2). * Doesn't support neither PMSA (MPU) nor VMSA (MMU). Signed-off-by: Ahmed Ismail <[email protected]>
Signed-off-by: Gaurav Aggarwal <[email protected]>
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This commit includes the following changes * Currently, the expectation is that applications would explicitly call xPortStartScheduler() on all secondary cores. However, this approach places an unnecessary burden on the application developer and assumes strict adherence to our example code, which we cannot guarantee. To make the port more inclusive and align with the principle that the kernel should take care of system responsibilities, we are shifting this logic into the port itself. With this change, the application developer only needs to call vTaskStartScheduler() on the primary core, does an SVC call once the secondary cores are online, and the kernel will ensure that all secondary cores are properly managed. * Support tasks running in EL0 and only kernel running in EL1, the changes are just having multiple SVCs for different purposes (whenever a privileged instruction (e.g., MSR) is to be executed). Signed-off-by: Ahmed Ismail <[email protected]>
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #1289 +/- ##
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Coverage 91.46% 91.46%
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Files 6 6
Lines 3256 3256
Branches 899 899
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Misses 132 132
Partials 146 146
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Description
The goal of this PR is to add the GCC/ARMClang non-MPU port variant for ARM Cortex-R82 processor ( ARMv8-R AArch64 based ).
This port has the following features:
Test Steps
Checklist:
Related Issue
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