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drivers: entropy native: Refactor to support embedded libCs

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Refactor the host libC accesses to use the native simulator
host trampolines.

In this way we support building this driver with embedded libCs.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
This commit is contained in:
Alberto Escolar Piedras 2023-06-21 14:46:00 +02:00 committed by Carles Cufí
parent 265010a4b6
commit 8252e99608
3 changed files with 4 additions and 4 deletions
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2
boards/posix/native_sim/doc/index.rst
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@ -109,7 +109,7 @@ host libC (:kconfig:option:`CONFIG_EXTERNAL_LIBC`).
can, can native posix, :kconfig:option:`CONFIG_CAN_NATIVE_POSIX_LINUX`, host libC
console backend, POSIX arch console, :kconfig:option:`CONFIG_POSIX_ARCH_CONSOLE`, all
display, display SDL, :kconfig:option:`CONFIG_SDL_DISPLAY`, all
entropy, native posix entropy, :kconfig:option:`CONFIG_FAKE_ENTROPY_NATIVE_POSIX`, host libC
entropy, native posix entropy, :kconfig:option:`CONFIG_FAKE_ENTROPY_NATIVE_POSIX`, all
eprom, eprom emulator, :kconfig:option:`CONFIG_EEPROM_EMULATOR`, host libC
ethernet, eth native_posix, :kconfig:option:`CONFIG_ETH_NATIVE_POSIX`, host libC
flash, flash simulator, :kconfig:option:`CONFIG_FLASH_SIMULATOR`, host libC

1
drivers/entropy/Kconfig.native_posix
View file

@ -4,7 +4,6 @@ config FAKE_ENTROPY_NATIVE_POSIX
bool "Native posix entropy driver"
default y
depends on DT_HAS_ZEPHYR_NATIVE_POSIX_RNG_ENABLED
depends on EXTERNAL_LIBC
select ENTROPY_HAS_DRIVER
help
This option enables the test random number generator for the

5
drivers/entropy/fake_entropy_native_posix.c
View file

@ -22,6 +22,7 @@
#include <zephyr/arch/posix/posix_trace.h>
#include "soc.h"
#include "cmdline.h" /* native_posix command line options header */
#include "nsi_host_trampolines.h"
static unsigned int seed = 0x5678;
@ -36,7 +37,7 @@ static int entropy_native_posix_get_entropy(const struct device *dev,
* Note that only 1 thread (Zephyr thread or HW models), runs at
* a time, therefore there is no need to use random_r()
*/
long int value = random();
long value = nsi_host_random();
size_t to_copy = MIN(length, sizeof(long int));
@ -64,7 +65,7 @@ static int entropy_native_posix_get_entropy_isr(const struct device *dev,
static int entropy_native_posix_init(const struct device *dev)
{
ARG_UNUSED(dev);
srandom(seed);
nsi_host_srandom(seed);
posix_print_warning("WARNING: "
"Using a test - not safe - entropy source\n");
return 0;