circuitpython/ports/stm32/mbedtls/mbedtls_port.c

97 lines
2.8 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "py/gc.h"
#include "rng.h"
#include "mbedtls_config.h"
#define DEBUG (0)
#if DEBUG
static size_t count_links(uint32_t *nb) {
void **p = MP_STATE_PORT(mbedtls_memory);
size_t n = 0;
*nb = 0;
while (p != NULL) {
++n;
*nb += gc_nbytes(p);
p = (void**)p[1];
}
return n;
}
#endif
void *m_calloc_mbedtls(size_t nmemb, size_t size) {
void **ptr = m_malloc0(nmemb * size + 2 * sizeof(uintptr_t));
#if DEBUG
uint32_t nb;
size_t n = count_links(&nb);
printf("mbed_alloc(%u, %u) -> (%u;%u) %p\n", nmemb, size, n, (uint)nb, ptr);
#endif
if (MP_STATE_PORT(mbedtls_memory) != NULL) {
MP_STATE_PORT(mbedtls_memory)[0] = ptr;
}
ptr[0] = NULL;
ptr[1] = MP_STATE_PORT(mbedtls_memory);
MP_STATE_PORT(mbedtls_memory) = ptr;
return &ptr[2];
}
void m_free_mbedtls(void *ptr_in) {
void **ptr = &((void**)ptr_in)[-2];
#if DEBUG
uint32_t nb;
size_t n = count_links(&nb);
printf("mbed_free(%p, [%p, %p], nbytes=%u, links=%u;%u)\n", ptr, ptr[0], ptr[1], gc_nbytes(ptr), n, (uint)nb);
#endif
if (ptr[1] != NULL) {
((void**)ptr[1])[0] = ptr[0];
}
if (ptr[0] != NULL) {
((void**)ptr[0])[1] = ptr[1];
} else {
MP_STATE_PORT(mbedtls_memory) = ptr[1];
}
m_free(ptr);
}
int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen) {
uint32_t val;
int n = 0;
*olen = len;
while (len--) {
if (!n) {
val = rng_get();
n = 4;
}
*output++ = val;
val >>= 8;
--n;
}
return 0;
}