Sleep manager implements all the API's in platform/mbed_sleep_manager.changes ...

Not sure why mbed_sleep_manager.c was in hal, moving it to platform

Merge pull request #9260 from deepikabhavnani/flags_fix ...

Use mbed_error_printf instead of debug for ISR friendly prints

Use mbed_error_printf instead of debug for ISR friendly prints ...

Internally in sleep tracing `debug` was used for trace prints, but
all sleep API's are ISR safe and used in interrupts. This resulted in
hardfaults / errors.

Solution is to use `mbed_error_printf` instead for printing on UART

critical sections: remove unnecessary volatile ...

Critical section count/state variables are synchronised by IRQ disabling and
critical section calls themselves, so do not need to be volatile.

This eliminates a couple of unnecessary reads of the counter variable.

Fix ticker_read_us() race condition.

Don't use define checks on DEVICE_FOO macros (mbed code) ...

The DEVICE_FOO macros are always defined (either 0 or 1).

This patch replaces any instances of a define check on a DEVICE_FOO
macro with value test instead.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>

Fix target.mpu-rom-end setting, for ARMv8-M too ...

targets.json was not specifying the same macro name as the code was
checking for, so setting was ineffective.

Making this work tripped up not-supported checks in ARMv8-M - rather than deal
with making this work, support it instead.

Both ARMv7-M and ARMv8-M slightly reduce code size and runtime impact if
mpu-rom-end is 0x1fffffff, using one fewer region.

This means default setup for ARMv8-M now requires 5 regions, with
mpu-rom-end set to default 0x0fffffff, but this can be put back to 4 by
changing the setting.

ARMv7-M MPU: correctly protect 80000000 RAM region ...

Subregion mask for this region was set fully disabled, instead of fully
enabled.

Assert MPU regions, rather than error ...

As we build for a specific CPU, a runtime check for number of MPU
regions in release builds is not worthwhile. Make it an assert only.
Saves a little space in develop images, a lot in release.

MPU - use higher-level calls, fix ARMv8-M error ...

Switch to higher-level calls and macros, and fix an error in the ARMv8-M
version - "inner" attributes were not being set correctly due to a
copy/paste error - "outer" was being set twice.

This means RAM would have been marked WTRA rather than WBWA for the
inner cache.

Slightly reduces ARMv7-M init code size by feeding region number
into RBAR instead of using RNR.

Reduce dynamic MPU code size with a loop

Fix MPU synchronisation ...

Synchronisation instructions were not quite right - too strict on entry,
and not quite correctly synchronising the instruction stream on exit.

References:

* https://static.docs.arm.com/dai0321/a/DAI0321A_programming_guide_memory_barriers_for_m_profile.pdf
* https://static.docs.arm.com/100699/0100/armv8m_architecture_memory_protection_unit_100699_0100_00_en.pdf

Save ROM by specifying initial MPU state ...

We can omit the need for the "change MPU state" calls from simple images
by specifying the initial state at init.

Merge pull request #8956 from c1728p9/don't_ignore_early_interrupts ...

Update Ticker wrapper to handle early interrupts

Merge pull request #8873 from kfnta/psa_spm_docs ...

PSA-SPM documentation follow-up

Update Ticker wrapper to handle early interrupts ...

Update the LowPowerTickerWrapper class to handle rather than ignore
early low power ticker interrupts. This ensures that devices don't get
stuck in sleep due to a ignored early low power ticker interrupt.

hal: add spdx license

set proper groups for spm and HAL

Fix PSA-SPM Documentation

Merge pull request #8871 from c1728p9/mpu ...

MPU API (Reopened)

Fix asyle problems ...

Run astyle to fix CI failures.

Overhaul MPU for new requirements ...

Make the following changes:
-Allow a vector specific ARM MPU driver by defining MBED_MPU_CUSTOM
-Allow ROM address to be configured for ARMv7-M devices by
    setting the define MBED_MPU_ROM_END
-Add ROM write protection
    -Add new functions and lock
    -enable at boot
    -disable during flash programming

Add a formal HAL specification for the MPU API ...

Add a formal HAL specification consisting of:
-defined and undefined behavior
-test descriptions
-enable doxygen for MPU

Add v8m MPU ...

Add a driver for the v8m MPU.

Rework MPU layout for future changes ...

Create a dedicated MPU directory for standard Arm MPU implementations
in preparation for the Arm v8m MPU. Replace MBED_MPU_ENABLED with
DEVICE_MPU to align with the porting layer of other HAL APIs.

Add an initial MPU API ...

Add a minimalistic HAL MPU API with the ability to prevent execution
in ram.

Edit spm_api.h ...

Edit file, mostly for minor grammar and style changes.

CR fixes

PSA SPM ...

* Intorduce PSA-SPM to mbed-os
* Add SPM tests (for PSA targets)
* Add PSA PRoT internal storage Secure implementation
* Integrate SPM into the boot proccess
* PSA manifest data generator
* Introduce PSA targets skeleton to mbed-os
* Add artifact delivery to the tools

Support erase value in Flash HAL drivers, FlashIAP and block devices