dwc_tasklet_t *DWC_TASK_ALLOC(char *name, dwc_tasklet_callback_t cb, void *data)
{
dwc_tasklet_t *t = DWC_ALLOC(sizeof(*t));
if (t == NULL) {
return NULL;
}
t->cb = cb;
t->data = data;
return t;
}
void *__DWC_DMA_ALLOC(void *dma_ctx, uint32_t size, dwc_dma_t * dma_addr)
{
void *buf = DWC_ALLOC(size);
if (!buf) {
return NULL;
}
*dma_addr = (dwc_dma_t) buf;
DWC_MEMSET(buf, 0, size);
return buf;
}
/* Computes the modular exponentiation (num^exp % mod). num, exp, and mod are
* big endian numbers of size len, in bytes. Each len value must be a multiple
* of 4. */
int dwc_dh_modpow(void *num, uint32_t num_len,
void *exp, uint32_t exp_len,
void *mod, uint32_t mod_len,
void *out)
{
/* modpow() takes little endian numbers. AM uses big-endian. This
* function swaps bytes of numbers before passing onto modpow. */
int retval = 0;
uint32_t *result;
uint32_t *bignum_num = DWC_ALLOC(num_len + 4);
uint32_t *bignum_exp = DWC_ALLOC(exp_len + 4);
uint32_t *bignum_mod = DWC_ALLOC(mod_len + 4);
dh_swap_bytes(num, &bignum_num[1], num_len);
bignum_num[0] = num_len / 4;
dh_swap_bytes(exp, &bignum_exp[1], exp_len);
bignum_exp[0] = exp_len / 4;
dh_swap_bytes(mod, &bignum_mod[1], mod_len);
bignum_mod[0] = mod_len / 4;
result = dwc_modpow(bignum_num, bignum_exp, bignum_mod);
if (!result) {
retval = -1;
goto dh_modpow_nomem;
}
dh_swap_bytes(&result[1], out, result[0] * 4);
DWC_FREE(result);
dh_modpow_nomem:
DWC_FREE(bignum_num);
DWC_FREE(bignum_exp);
DWC_FREE(bignum_mod);
return retval;
}
dwc_timer_t *DWC_TIMER_ALLOC(char *name, dwc_timer_callback_t cb, void *data)
{
dwc_timer_t *t = DWC_ALLOC(sizeof(*t));
/*OS_ERR_TYPE err;*/
if (t == NULL) {
DWC_ERROR("Cannot allocate memory for timer");
return NULL;
}
t->lock = DWC_SPINLOCK_ALLOC();
if (!t->lock) {
DWC_ERROR("Cannot allocate memory for lock");
goto no_lock;
}
t->scheduled = 0;
t->cb = cb;
t->data = data;
/*t->t = timer_create(timer_callback, (void *)t, 0, 0, 0, &err);
if (err == E_OS_ERR) {
DWC_ERROR("Cannot allocate memory for timer->t");
goto no_timer;
}*/
return t;
/* no_timer: */
DWC_SPINLOCK_FREE(t->lock);
no_lock:
DWC_FREE(t);
return NULL;
}
