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linker: add bits for pinned regions

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This adds the necessary bits for linker scripts and source code
to specify which symbols need to be pinned in memory. This is
needed for demand paging as some functions and data must reside
in memory all the time and cannot be paged out (e.g. paging,
scheduler, and interrupt routines for functionality).

This is up to the arch/SoC/board to define the sections in
their linker scripts as the pinned 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 2021-02-23 13:33:38 -08:00 • committed by Kumar Gala
commit 1310ad6b0e
8 changed files with 164 additions and 0 deletions
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26
include/linker/linker-defs.h
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@ -341,6 +341,32 @@ extern char lnkr_boot_noinit_end[];
extern char lnkr_boot_noinit_size[];
#endif /* CONFIG_LINKER_USE_BOOT_SECTION */
#ifdef CONFIG_LINKER_USE_PINNED_SECTION
/* lnkr_pinned_start[] and lnkr_pinned_end[] must encapsulate
* all the pinned sections as these are used by
* the MMU code to mark the physical page frames with
* Z_PAGE_FRAME_PINNED.
*/
extern char lnkr_pinned_start[];
extern char lnkr_pinned_end[];
extern char lnkr_pinned_text_start[];
extern char lnkr_pinned_text_end[];
extern char lnkr_pinned_text_size[];
extern char lnkr_pinned_data_start[];
extern char lnkr_pinned_data_end[];
extern char lnkr_pinned_data_size[];
extern char lnkr_pinned_rodata_start[];
extern char lnkr_pinned_rodata_end[];
extern char lnkr_pinned_rodata_size[];
extern char lnkr_pinned_bss_start[];
extern char lnkr_pinned_bss_end[];
extern char lnkr_pinned_bss_size[];
extern char lnkr_pinned_noinit_start[];
extern char lnkr_pinned_noinit_end[];
extern char lnkr_pinned_noinit_size[];
#endif /* CONFIG_LINKER_USE_PINNED_SECTION */
#endif /* ! _ASMLANGUAGE */
#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_ */