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The 'rng list' command probes all RNG devices and list those devices that are successfully probed. Also update the help info. Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* The 'rng' command prints bytes from the hardware random number generator.
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*
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* Copyright (c) 2019, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <hexdump.h>
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#include <malloc.h>
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#include <rng.h>
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static int do_rng(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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{
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size_t n;
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u8 buf[64];
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int devnum;
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struct udevice *dev;
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int ret = CMD_RET_SUCCESS;
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if (argc == 2 && !strcmp(argv[1], "list")) {
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int idx = 0;
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uclass_foreach_dev_probe(UCLASS_RNG, dev) {
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idx++;
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printf("RNG #%d - %s\n", dev->seq_, dev->name);
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}
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if (!idx) {
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log_err("No RNG device\n");
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return CMD_RET_FAILURE;
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}
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return CMD_RET_SUCCESS;
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}
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switch (argc) {
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case 1:
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devnum = 0;
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n = 0x40;
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break;
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case 2:
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devnum = hextoul(argv[1], NULL);
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n = 0x40;
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break;
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case 3:
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devnum = hextoul(argv[1], NULL);
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n = hextoul(argv[2], NULL);
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break;
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default:
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return CMD_RET_USAGE;
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}
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if (uclass_get_device_by_seq(UCLASS_RNG, devnum, &dev) || !dev) {
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printf("No RNG device\n");
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return CMD_RET_FAILURE;
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}
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if (!n)
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return 0;
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n = min(n, sizeof(buf));
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if (dm_rng_read(dev, buf, n)) {
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printf("Reading RNG failed\n");
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ret = CMD_RET_FAILURE;
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} else {
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print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, buf, n);
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}
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return ret;
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}
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U_BOOT_CMD(
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rng, 3, 0, do_rng,
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"print bytes from the hardware random number generator",
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"list - list all the probed rng devices\n"
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"rng [dev] [n] - print n random bytes(max 64) read from dev\n"
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);
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