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arch: introduce option to force internal architectural state init

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We introduce an option that instructs Zephyr to perform
the initialization of internal architectural state (e.g.
ARCH-level HW registers and system control blocks) during
early boot to the reset values. The option is available
to the application developer but shall depend on whether
the architecture supports the functionality.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2020-10-21 15:48:41 +02:00
parent b3ff89bd51
commit 20a9848230
1 changed files with 21 additions and 0 deletions
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21
arch/Kconfig
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@ -384,6 +384,24 @@ config EXTRA_EXCEPTION_INFO
endmenu # Interrupt configuration
config INIT_ARCH_HW_AT_BOOT
bool "Initialize internal architecture state at boot"
depends on ARCH_SUPPORTS_ARCH_HW_INIT
help
This option instructs Zephyr to force the initialization
of the internal architectural state (for example ARCH-level
HW registers and system control blocks) during boot to
the reset values as specified by the corresponding
architecture manual. The option is useful when the Zephyr
firmware image is chain-loaded, for example, by a debugger
or a bootloader, and we need to guarantee that the internal
states of the architecture core blocks are restored to the
reset values (as specified by the architecture).
Note: the functionality is architecture-specific. For the
implementation details refer to each architecture where
this feature is supported.
endmenu
#
@ -417,6 +435,9 @@ config ARCH_HAS_NESTED_EXCEPTION_DETECTION
config ARCH_SUPPORTS_COREDUMP
bool
config ARCH_SUPPORTS_ARCH_HW_INIT
bool
config ARCH_HAS_EXTRA_EXCEPTION_INFO
bool