michaelh/zephyr
1
0
Fork 0
Code Releases Activity

linker: add bits for boot regions

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

24
include/linker/linker-defs.h
View file

@ -317,6 +317,30 @@ extern char __tls_end[];
extern char __tls_size[];
#endif /* CONFIG_THREAD_LOCAL_STORAGE */
#ifdef CONFIG_LINKER_USE_BOOT_SECTION
/* lnkr_boot_start[] and lnkr_boot_end[]
* must encapsulate all the boot sections.
*/
extern char lnkr_boot_start[];
extern char lnkr_boot_end[];
extern char lnkr_boot_text_start[];
extern char lnkr_boot_text_end[];
extern char lnkr_boot_text_size[];
extern char lnkr_boot_data_start[];
extern char lnkr_boot_data_end[];
extern char lnkr_boot_data_size[];
extern char lnkr_boot_rodata_start[];
extern char lnkr_boot_rodata_end[];
extern char lnkr_boot_rodata_size[];
extern char lnkr_boot_bss_start[];
extern char lnkr_boot_bss_end[];
extern char lnkr_boot_bss_size[];
extern char lnkr_boot_noinit_start[];
extern char lnkr_boot_noinit_end[];
extern char lnkr_boot_noinit_size[];
#endif /* CONFIG_LINKER_USE_BOOT_SECTION */
#endif /* ! _ASMLANGUAGE */
#endif /* ZEPHYR_INCLUDE_LINKER_LINKER_DEFS_H_ */