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cmd: add rng command

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For the RNG uclass we currently only have a test working on the sandbox.

Provide a command to test the hardware random number generator on
non-sandbox systems.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-12-24 22:17:37 +01:00
parent 03018ea8fd
commit 4f24ac08af
3 changed files with 64 additions and 0 deletions
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7
cmd/Kconfig
View file

@ -1672,6 +1672,13 @@ config CMD_GETTIME
milliseconds. See also the 'bootstage' command which provides more
flexibility for boot timing.
config CMD_RNG
bool "rng command"
depends on DM_RNG
select HEXDUMP
help
Print bytes from the hardware random number generator.
# TODO: rename to CMD_SLEEP
config CMD_MISC
bool "sleep"

1
cmd/Makefile
View file

@ -117,6 +117,7 @@ obj-$(CONFIG_CMD_READ) += read.o
obj-$(CONFIG_CMD_REGINFO) += reginfo.o
obj-$(CONFIG_CMD_REISER) += reiser.o
obj-$(CONFIG_CMD_REMOTEPROC) += remoteproc.o
obj-$(CONFIG_CMD_RNG) += rng.o
obj-$(CONFIG_CMD_ROCKUSB) += rockusb.o
obj-$(CONFIG_SANDBOX) += host.o
obj-$(CONFIG_CMD_SATA) += sata.o

56
cmd/rng.c Normal file
View file

@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* The 'rng' command prints bytes from the hardware random number generator.
*
* Copyright (c) 2019, Heinrich Schuchardt <xypron.glpk@gmx.de>
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <hexdump.h>
#include <rng.h>
static int do_rng(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
size_t n = 0x40;
struct udevice *dev;
void *buf;
int ret = CMD_RET_SUCCESS;
if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
printf("No RNG device\n");
return CMD_RET_FAILURE;
}
if (argc >= 2)
n = simple_strtoul(argv[1], NULL, 16);
buf = malloc(n);
if (!buf) {
printf("Out of memory\n");
return CMD_RET_FAILURE;
}
if (dm_rng_read(dev, buf, n)) {
printf("Reading RNG failed\n");
ret = CMD_RET_FAILURE;
} else {
print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf, n);
}
free(buf);
return ret;
}
#ifdef CONFIG_SYS_LONGHELP
static char rng_help_text[] =
"[n]\n"
" - print n random bytes\n";
#endif
U_BOOT_CMD(
rng, 2, 0, do_rng,
"print bytes from the hardware random number generator",
rng_help_text
);