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cmake: Add support to add symbols to nocache section

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This PR allows the user to add symbols to the nocache
section. The use for this could be as follows

zephyr_linker_sources_ifdef(CONFIG_NOCACHE_MEMORY
  NOCACHE_SECTION
  nocache.ld
)

nocache.ld (as shown below) can define additional
symbols to  go into the nocache section

. = ALIGN(4);
KEEP(*(NonCacheable))

Signed-off-by: Mahesh Mahadevan <mahesh.mahadevan@nxp.com>
This commit is contained in:
Mahesh Mahadevan 2022-08-22 11:05:04 -05:00 committed by Carles Cufí
parent 8195ea7ea0
commit c029b081cc
2 changed files with 11 additions and 3 deletions
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3
arch/common/nocache.ld
View file

@ -18,6 +18,9 @@ SECTION_DATA_PROLOGUE(_NOCACHE_SECTION_NAME,(NOLOAD),)
_nocache_ram_start = .;
*(.nocache)
*(".nocache.*")
#include <snippets-nocache-section.ld>
#if defined(CONFIG_MMU)
MMU_ALIGN;
#else

11
cmake/modules/extensions.cmake
View file

@ -1146,6 +1146,7 @@ endfunction(zephyr_check_compiler_flag_hardcoded)
# RAM_SECTIONS Inside the RAMABLE_REGION GROUP, not initialized.
# DATA_SECTIONS Inside the RAMABLE_REGION GROUP, initialized.
# RAMFUNC_SECTION Inside the RAMFUNC RAMABLE_REGION GROUP, not initialized.
# NOCACHE_SECTION Inside the NOCACHE section
# SECTIONS Near the end of the file. Don't use this when linking into
# RAMABLE_REGION, use RAM_SECTIONS instead.
# PINNED_RODATA Similar to RODATA but pinned in memory.
@ -1159,9 +1160,9 @@ endfunction(zephyr_check_compiler_flag_hardcoded)
#
# Use NOINIT, RWDATA, and RODATA unless they don't work for your use case.
#
# When placing into NOINIT, RWDATA, RODATA, ROM_START, RAMFUNC_SECTION the
# contents of the files will be placed inside an output section, so assume
# the section definition is already present, e.g.:
# When placing into NOINIT, RWDATA, RODATA, ROM_START, RAMFUNC_SECTION,
# NOCACHE_SECTION the contents of the files will be placed inside
# an output section, so assume the section definition is already present, e.g.:
# _mysection_start = .;
# KEEP(*(.mysection));
# _mysection_end = .;
@ -1195,6 +1196,7 @@ function(zephyr_linker_sources location)
set(rwdata_path "${snippet_base}/snippets-rwdata.ld")
set(rodata_path "${snippet_base}/snippets-rodata.ld")
set(ramfunc_path "${snippet_base}/snippets-ramfunc-section.ld")
set(nocache_path "${snippet_base}/snippets-nocache-section.ld")
set(pinned_ram_sections_path "${snippet_base}/snippets-pinned-ram-sections.ld")
set(pinned_data_sections_path "${snippet_base}/snippets-pinned-data-sections.ld")
@ -1211,6 +1213,7 @@ function(zephyr_linker_sources location)
file(WRITE ${rwdata_path} "")
file(WRITE ${rodata_path} "")
file(WRITE ${ramfunc_path} "")
file(WRITE ${nocache_path} "")
file(WRITE ${pinned_ram_sections_path} "")
file(WRITE ${pinned_data_sections_path} "")
file(WRITE ${pinned_rodata_path} "")
@ -1234,6 +1237,8 @@ function(zephyr_linker_sources location)
set(snippet_path "${rodata_path}")
elseif("${location}" STREQUAL "RAMFUNC_SECTION")
set(snippet_path "${ramfunc_path}")
elseif("${location}" STREQUAL "NOCACHE_SECTION")
set(snippet_path "${nocache_path}")
elseif("${location}" STREQUAL "PINNED_RAM_SECTIONS")
set(snippet_path "${pinned_ram_sections_path}")
elseif("${location}" STREQUAL "PINNED_DATA_SECTIONS")