u-boot/drivers/rng/sandbox_rng.c
Simon Glass 90526e9fba common: Drop net.h from common header
Move this header out of the common header. Network support is used in
quite a few places but it still does not warrant blanket inclusion.

Note that this net.h header itself has quite a lot in it. It could be
split into the driver-mode support, functions, structures, checksumming,
etc.

Signed-off-by: Simon Glass <sjg@chromium.org>
2020-05-18 17:33:31 -04:00

57 lines
1,014 B
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2019, Linaro Limited
*/
#include <common.h>
#include <dm.h>
#include <rand.h>
#include <rng.h>
#include <linux/string.h>
static int sandbox_rng_read(struct udevice *dev, void *data, size_t len)
{
unsigned int i, seed, random;
unsigned char *buf = data;
size_t nrem, nloops;
if (!len)
return 0;
nloops = len / sizeof(random);
seed = get_timer(0) ^ rand();
srand(seed);
for (i = 0, nrem = len; i < nloops; i++) {
random = rand();
memcpy(buf, &random, sizeof(random));
buf += sizeof(random);
nrem -= sizeof(random);
}
if (nrem) {
random = rand();
memcpy(buf, &random, nrem);
}
return 0;
}
static const struct dm_rng_ops sandbox_rng_ops = {
.read = sandbox_rng_read,
};
static const struct udevice_id sandbox_rng_match[] = {
{
.compatible = "sandbox,sandbox-rng",
},
{},
};
U_BOOT_DRIVER(sandbox_rng) = {
.name = "sandbox-rng",
.id = UCLASS_RNG,
.of_match = sandbox_rng_match,
.ops = &sandbox_rng_ops,
};