diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c')
| -rw-r--r-- | c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c b/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c deleted file mode 100644 index 11e24dcda1..0000000000 --- a/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c +++ /dev/null @@ -1,61 +0,0 @@ -/* - * Copyright (c) 2017 embedded brains GmbH. All rights reserved. - * - * embedded brains GmbH - * Dornierstr. 4 - * 82178 Puchheim - * Germany - * <rtems@embedded-brains.de> - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - */ - -#include <libchip/chip.h> -#include <unistd.h> -#include <string.h> -#include <rtems/sysinit.h> - -static void atsam_trng_enable(void) -{ - PMC_EnablePeripheral(ID_TRNG); - TRNG_Enable(); -} - -int getentropy(void *ptr, size_t n) -{ - while (n > 0) { - uint32_t random; - size_t copy; - - while ((TRNG_GetStatus() & TRNG_ISR_DATRDY) == 0) { - /* wait */ - } - random = TRNG_GetRandData(); - - /* - * Read TRNG status one more time to avoid race condition. - * Otherwise we can read (and clear) an old ready status but get - * a new value. The ready status for this value wouldn't be - * reset. - */ - TRNG_GetStatus(); - - copy = sizeof(random); - if (n < copy ) { - copy = n; - } - memcpy(ptr, &random, copy); - n -= copy; - ptr += copy; - } - - return 0; -} - -RTEMS_SYSINIT_ITEM( - atsam_trng_enable, - RTEMS_SYSINIT_DEVICE_DRIVERS, - RTEMS_SYSINIT_ORDER_LAST -); |