adafruit-mirror/zephyr
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 9

mbedtls: add ability to use custom memory section for mbedtls heap

Browse source 
This commit introduces the option to place the mbed TLS heap in a custom
memory section. The heap might be quite large depending on concurrent
TLS connections, thus it might be needed to place this manually

Signed-off-by: Emil Lindqvist <emil@lindq.gr>
This commit is contained in:
Emil Lindqvist 2024-08-20 14:52:53 +02:00 committed by Carles Cufí
parent 8233aa122a
commit ca41413038
2 changed files with 17 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
modules/mbedtls/Kconfig
View file

@ -186,11 +186,12 @@ config MBEDTLS_ENABLE_HEAP
in mbedtls. If this is enabled, and MBEDTLS_INIT is enabled then the
Zephyr will, during the device startup, initialize the heap automatically.
if MBEDTLS_ENABLE_HEAP
config MBEDTLS_HEAP_SIZE
int "Heap size for mbed TLS"
default 10240 if OPENTHREAD_COMMISSIONER || OPENTHREAD_JOINER
default 512
depends on MBEDTLS_ENABLE_HEAP
help
The mbedtls routines will use this heap if enabled.
See ext/lib/crypto/mbedtls/include/mbedtls/config.h and
@ -202,6 +203,15 @@ config MBEDTLS_HEAP_SIZE
be needed. For some dedicated and specific usage of mbedtls API, the
1000 bytes might be ok.
config MBEDTLS_HEAP_CUSTOM_SECTION
bool "Use a custom section for the Mbed TLS heap"
help
Place Mbed TLS heap in custom section, with tag ".mbedtls_heap".
This can be used by custom linker scripts to relocate the Mbed TLS
heap to a custom location, such as another SRAM region or external memory.
endif # MBEDTLS_ENABLE_HEAP
config MBEDTLS_INIT
bool "Initialize mbed TLS at boot"
default y

12
modules/mbedtls/zephyr_init.c
View file

@ -29,12 +29,12 @@
defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
#include <mbedtls/memory_buffer_alloc.h>
#if !defined(CONFIG_MBEDTLS_HEAP_SIZE)
#error "Please set heap size to be used. Set value to CONFIG_MBEDTLS_HEAP_SIZE \
option."
#endif
static unsigned char _mbedtls_heap[CONFIG_MBEDTLS_HEAP_SIZE];
#ifdef CONFIG_MBEDTLS_HEAP_CUSTOM_SECTION
#define HEAP_MEM_ATTRIBUTES Z_GENERIC_SECTION(.mbedtls_heap)
#else
#define HEAP_MEM_ATTRIBUTES
#endif /* CONFIG_MBEDTLS_HEAP_CUSTOM_SECTION */
static unsigned char _mbedtls_heap[CONFIG_MBEDTLS_HEAP_SIZE] HEAP_MEM_ATTRIBUTES;
static void init_heap(void)
{