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"Das U-Boot" Source Tree
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Verified Boot for Embedded (VBE) command
4 *
5 * Copyright 2022 Google LLC
6 * Written by Simon Glass <sjg@chromium.org>
7 */
8
9#include <bloblist.h>
10#include <bootmeth.h>
11#include <bootstd.h>
12#include <command.h>
13#include <spl.h>
14#include <vbe.h>
15
16static int do_vbe_list(struct cmd_tbl *cmdtp, int flag, int argc,
17 char *const argv[])
18{
19 vbe_list();
20
21 return 0;
22}
23
24static int do_vbe_select(struct cmd_tbl *cmdtp, int flag, int argc,
25 char *const argv[])
26{
27 struct bootstd_priv *std;
28 struct udevice *dev;
29 int ret;
30
31 ret = bootstd_get_priv(&std);
32 if (ret)
33 return CMD_RET_FAILURE;
34 if (argc < 2) {
35 std->vbe_bootmeth = NULL;
36 return 0;
37 }
38 if (vbe_find_by_any(argv[1], &dev))
39 return CMD_RET_FAILURE;
40
41 std->vbe_bootmeth = dev;
42
43 return 0;
44}
45
46static int do_vbe_info(struct cmd_tbl *cmdtp, int flag, int argc,
47 char *const argv[])
48{
49 struct bootstd_priv *std;
50 char buf[256];
51 int ret, len;
52
53 ret = bootstd_get_priv(&std);
54 if (ret)
55 return CMD_RET_FAILURE;
56 if (!std->vbe_bootmeth) {
57 printf("No VBE bootmeth selected\n");
58 return CMD_RET_FAILURE;
59 }
60 ret = bootmeth_get_state_desc(std->vbe_bootmeth, buf, sizeof(buf));
61 if (ret) {
62 printf("Failed (err=%d)\n", ret);
63 return CMD_RET_FAILURE;
64 }
65 len = strnlen(buf, sizeof(buf));
66 if (len >= sizeof(buf)) {
67 printf("Buffer overflow\n");
68 return CMD_RET_FAILURE;
69 }
70
71 puts(buf);
72 if (buf[len] != '\n')
73 putc('\n');
74
75 return 0;
76}
77
78static int do_vbe_state(struct cmd_tbl *cmdtp, int flag, int argc,
79 char *const argv[])
80{
81 struct vbe_handoff *handoff = NULL;
82 int i;
83
84 if (IS_ENABLED(CONFIG_BLOBLIST)) {
85 handoff = bloblist_find(BLOBLISTT_VBE,
86 sizeof(struct vbe_handoff));
87 }
88 if (!handoff) {
89 printf("No VBE state\n");
90 return CMD_RET_FAILURE;
91 }
92
93 printf("Phases:");
94 for (i = PHASE_NONE; i < PHASE_COUNT; i++) {
95 if (handoff->phases & (1 << i))
96 printf(" %s", xpl_name(i));
97
98 }
99 if (!handoff->phases)
100 printf(" (none)");
101 printf("\n");
102
103 return 0;
104}
105
106U_BOOT_LONGHELP(vbe,
107 "list - list VBE bootmeths\n"
108 "vbe select - select a VBE bootmeth by sequence or name\n"
109 "vbe info - show information about a VBE bootmeth\n"
110 "vbe state - show VBE state");
111
112U_BOOT_CMD_WITH_SUBCMDS(vbe, "Verified Boot for Embedded", vbe_help_text,
113 U_BOOT_SUBCMD_MKENT(list, 1, 1, do_vbe_list),
114 U_BOOT_SUBCMD_MKENT(select, 2, 1, do_vbe_select),
115 U_BOOT_SUBCMD_MKENT(state, 2, 1, do_vbe_state),
116 U_BOOT_SUBCMD_MKENT(info, 2, 1, do_vbe_info));