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 <common.h>
10 #include <bloblist.h>
11 #include <bootmeth.h>
12 #include <bootstd.h>
13 #include <command.h>
14 #include <spl.h>
15 #include <vbe.h>
16
do_vbe_list(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])17 static int do_vbe_list(struct cmd_tbl *cmdtp, int flag, int argc,
18 char *const argv[])
19 {
20 vbe_list();
21
22 return 0;
23 }
24
do_vbe_select(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])25 static int do_vbe_select(struct cmd_tbl *cmdtp, int flag, int argc,
26 char *const argv[])
27 {
28 struct bootstd_priv *std;
29 struct udevice *dev;
30 int ret;
31
32 ret = bootstd_get_priv(&std);
33 if (ret)
34 return CMD_RET_FAILURE;
35 if (argc < 2) {
36 std->vbe_bootmeth = NULL;
37 return 0;
38 }
39 if (vbe_find_by_any(argv[1], &dev))
40 return CMD_RET_FAILURE;
41
42 std->vbe_bootmeth = dev;
43
44 return 0;
45 }
46
do_vbe_info(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])47 static int do_vbe_info(struct cmd_tbl *cmdtp, int flag, int argc,
48 char *const argv[])
49 {
50 struct bootstd_priv *std;
51 char buf[256];
52 int ret, len;
53
54 ret = bootstd_get_priv(&std);
55 if (ret)
56 return CMD_RET_FAILURE;
57 if (!std->vbe_bootmeth) {
58 printf("No VBE bootmeth selected\n");
59 return CMD_RET_FAILURE;
60 }
61 ret = bootmeth_get_state_desc(std->vbe_bootmeth, buf, sizeof(buf));
62 if (ret) {
63 printf("Failed (err=%d)\n", ret);
64 return CMD_RET_FAILURE;
65 }
66 len = strnlen(buf, sizeof(buf));
67 if (len >= sizeof(buf)) {
68 printf("Buffer overflow\n");
69 return CMD_RET_FAILURE;
70 }
71
72 puts(buf);
73 if (buf[len] != '\n')
74 putc('\n');
75
76 return 0;
77 }
78
do_vbe_state(struct cmd_tbl * cmdtp,int flag,int argc,char * const argv[])79 static int do_vbe_state(struct cmd_tbl *cmdtp, int flag, int argc,
80 char *const argv[])
81 {
82 struct vbe_handoff *handoff = NULL;
83 int i;
84
85 if (IS_ENABLED(CONFIG_BLOBLIST)) {
86 handoff = bloblist_find(BLOBLISTT_VBE,
87 sizeof(struct vbe_handoff));
88 }
89 if (!handoff) {
90 printf("No VBE state\n");
91 return CMD_RET_FAILURE;
92 }
93
94 printf("Phases:");
95 for (i = PHASE_NONE; i < PHASE_COUNT; i++) {
96 if (handoff->phases & (1 << i))
97 printf(" %s", spl_phase_name(i));
98
99 }
100 if (!handoff->phases)
101 printf(" (none)");
102 printf("\n");
103
104 return 0;
105 }
106
107 #ifdef CONFIG_SYS_LONGHELP
108 static char vbe_help_text[] =
109 "list - list VBE bootmeths\n"
110 "vbe select - select a VBE bootmeth by sequence or name\n"
111 "vbe info - show information about a VBE bootmeth\n"
112 "vbe state - show VBE state";
113 #endif
114
115 U_BOOT_CMD_WITH_SUBCMDS(vbe, "Verified Boot for Embedded", vbe_help_text,
116 U_BOOT_SUBCMD_MKENT(list, 1, 1, do_vbe_list),
117 U_BOOT_SUBCMD_MKENT(select, 2, 1, do_vbe_select),
118 U_BOOT_SUBCMD_MKENT(state, 2, 1, do_vbe_state),
119 U_BOOT_SUBCMD_MKENT(info, 2, 1, do_vbe_info));
120