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linker: arm: Add cortex_m itcm section

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Adds a linker section for Cortex-M instruction tightly coupled memory
(ITCM), similar to the existing section for DTCM. A new executable MPU
region is not added as there isn't currently a need to make this section
accessible to user mode. This section can be enabled by setting a device
tree chosen node zephyr,itcm.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
This commit is contained in:
Maureen Helm 2021-01-06 08:52:28 -06:00 • committed by Ioannis Glaropoulos
commit f63385204c
6 changed files with 41 additions and 0 deletions
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7
include/linker/linker-defs.h
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@ -230,6 +230,13 @@ extern char __ccm_noinit_end[];
extern char __ccm_end[];
#endif
#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_itcm), okay)
extern char __itcm_start[];
extern char __itcm_end[];
extern char __itcm_size[];
extern char __itcm_rom_start[];
#endif
#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_dtcm), okay)
extern char __dtcm_data_start[];
extern char __dtcm_data_end[];

1
include/linker/section_tags.h
View file

@ -23,6 +23,7 @@
#define __ccm_data_section Z_GENERIC_SECTION(_CCM_DATA_SECTION_NAME)
#define __ccm_bss_section Z_GENERIC_SECTION(_CCM_BSS_SECTION_NAME)
#define __ccm_noinit_section Z_GENERIC_SECTION(_CCM_NOINIT_SECTION_NAME)
#define __itcm_section Z_GENERIC_SECTION(_ITCM_SECTION_NAME)
#define __dtcm_data_section Z_GENERIC_SECTION(_DTCM_DATA_SECTION_NAME)
#define __dtcm_bss_section Z_GENERIC_SECTION(_DTCM_BSS_SECTION_NAME)
#define __dtcm_noinit_section Z_GENERIC_SECTION(_DTCM_NOINIT_SECTION_NAME)

2
include/linker/sections.h
View file

@ -43,6 +43,8 @@
#define _CCM_BSS_SECTION_NAME .ccm_bss
#define _CCM_NOINIT_SECTION_NAME .ccm_noinit
#define _ITCM_SECTION_NAME .itcm
#define _DTCM_DATA_SECTION_NAME .dtcm_data
#define _DTCM_BSS_SECTION_NAME .dtcm_bss
#define _DTCM_NOINIT_SECTION_NAME .dtcm_noinit