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cpu/avr8_common: Optimize context switch #19799

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cpu/avr8_common: Optimize context switch #19799

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Commits on Dec 3, 2023

  1. tests: add test for context switch from ISR 

    This try to explore a potential issue that may happen at context switch
inside ISR.

Signed-off-by: Gerson Fernando Budke <[email protected]>
    @nandojve
    nandojve committed Dec 3, 2023
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  2. cpu/avr8_common: Rework avr-8 interrupts 

    AVR-8 supports nested interrupts but there is no infrastructure to
use that.  This refactor infraestrocuture and enable the enhancement.
It rework the ISR processing to use a shared stack implemeting the
isr prolog/epilog/return.

Signed-off-by: Gerson Fernando Budke <[email protected]>
    @nandojve
    nandojve committed Dec 3, 2023
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  3. cpu/avr8_common: Fix assembly code style 

    Adjust the code style of cpu_get_caller_pc function.

Signed-off-by: Gerson Fernando Budke <[email protected]>
    @nandojve
    nandojve committed Dec 3, 2023
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  4. cpu/avr8_common: Optimize context ISR switch 

    The current context switch implementaion don't take in consideration
the call-used registers.  This means that ISR and context switch can
not be optimized.  This rework both context switch and ISR save/restore
order to optimize the context switch on ISR and reduce code size.

This chance should improve the performance of AVR platform on RIOT-OS
if is compared with the 2023.04 release.

Signed-off-by: Gerson Fernando Budke <[email protected]>
    @nandojve
    nandojve committed Dec 3, 2023
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  5. cpu/avr8_common: Add dedicated ISR stack 

    Signed-off-by: Gerson Fernando Budke <[email protected]>
    @nandojve
    nandojve committed Dec 3, 2023
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