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10 Commits (767c7f646e1133af20c6052aa4166442c0afdfaa)

Author SHA1 Message Date
Kevin Bracey 4e992a32ce 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.
 2018-12-27 22:26:03 -06:00
Kevin Bracey 263129a300 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.
 2018-12-27 22:26:03 -06:00
Kevin Bracey 60451368a8 Reduce dynamic MPU code size with a loop 2018-12-27 22:26:03 -06:00
Kevin Bracey 4f9b258a03 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
 2018-12-27 22:26:02 -06:00
Kevin Bracey 81acc28c3f Rework MPU use option 
Make the option positively named, and as it is a platform config
option make sure it only affects platform code.

HAL functions still remain available even if platform is told not
to use them.
 2018-12-11 16:14:50 -06:00
Russ Butler 2463596779 Add a platform config to disable the MPU 
Add the platform config DISABLE_MPU to allow the MPU to be disabled
from an application.
 2018-12-11 16:14:50 -06:00
Kevin Bracey 4d9f218ab2 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.
 2018-12-11 16:14:49 -06:00
Russ Butler 7cdfbee28b Fix asyle problems 
Run astyle to fix CI failures.
 2018-11-27 09:29:33 +00:00
Russ Butler 1821d37621 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
 2018-11-27 09:29:32 +00:00
Russ Butler a4aa5eaf93 Add v8m MPU 
Add a driver for the v8m MPU.
 2018-11-27 09:29:32 +00:00