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linker: add bits for boot regions

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This adds the necessary bits for linker scripts and source code
to specify which symbols are needed for boot process so they
can be grouped together.

One use of this is to group boot related code and data so these
won't interval with other kernel and application for better
caching.

This is a must for demand paging as some functions and data
must be available during the boot process and before the memory
manager is initialized. During this time, paging cannot be used
so symbols linked in virtual memory space are unavailable.

This is up to the arch/SoC/board to define the sections in
their linker scripts as section may need special alignment
which cannot be done in common script snippets.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>
This commit is contained in:
Daniel Leung 2021-02-24 10:18:34 -08:00 • committed by Kumar Gala
commit d812728ec4
6 changed files with 103 additions and 0 deletions
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Kconfig.zephyr
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@ -180,6 +180,20 @@ config SRAM_OFFSET
If unsure, leave at the default value 0.
menu "Linker Sections"
config LINKER_USE_BOOT_SECTION
bool "Enable Usage of Boot Linker Section"
help
If enabled, the symbols which are needed for the boot process
will be put into another linker section reserved for these
symbols.
Requires that boot sections exist in the architecture, SoC,
board or custom linker script.
endmenu # "Linker Sections"
endmenu
menu "Compiler Options"