1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * (C) Copyright 2014 Google, Inc
4  * Simon Glass <sjg@chromium.org>
5  */
6 
7 #ifndef __CLI_H
8 #define __CLI_H
9 
10 /**
11  * Go into the command loop
12  *
13  * This will return if we get a timeout waiting for a command. See
14  * CONFIG_BOOT_RETRY_TIME.
15  */
16 void cli_simple_loop(void);
17 
18 /**
19  * cli_simple_run_command() - Execute a command with the simple CLI
20  *
21  * @cmd:	String containing the command to execute
22  * @flag	Flag value - see CMD_FLAG_...
23  * @return 1  - command executed, repeatable
24  *	0  - command executed but not repeatable, interrupted commands are
25  *	     always considered not repeatable
26  *	-1 - not executed (unrecognized, bootd recursion or too many args)
27  *           (If cmd is NULL or "" or longer than CONFIG_SYS_CBSIZE-1 it is
28  *           considered unrecognized)
29  */
30 int cli_simple_run_command(const char *cmd, int flag);
31 
32 /**
33  * cli_simple_process_macros() - Expand $() and ${} format env. variables
34  *
35  * @param input		Input string possible containing $() / ${} vars
36  * @param output	Output string with $() / ${} vars expanded
37  * @param max_size	Maximum size of @output (including terminator)
38  * @return 0 if OK, -ENOSPC if we ran out of space in @output
39  */
40 int cli_simple_process_macros(const char *input, char *output, int max_size);
41 
42 /**
43  * cli_simple_run_command_list() - Execute a list of command
44  *
45  * The commands should be separated by ; or \n and will be executed
46  * by the built-in parser.
47  *
48  * This function cannot take a const char * for the command, since if it
49  * finds newlines in the string, it replaces them with \0.
50  *
51  * @param cmd	String containing list of commands
52  * @param flag	Execution flags (CMD_FLAG_...)
53  * @return 0 on success, or != 0 on error.
54  */
55 int cli_simple_run_command_list(char *cmd, int flag);
56 
57 /**
58  * cli_readline() - read a line into the console_buffer
59  *
60  * This is a convenience function which calls cli_readline_into_buffer().
61  *
62  * @prompt: Prompt to display
63  * @return command line length excluding terminator, or -ve on error
64  */
65 int cli_readline(const char *const prompt);
66 
67 /**
68  * readline_into_buffer() - read a line into a buffer
69  *
70  * Display the prompt, then read a command line into @buffer. The
71  * maximum line length is CONFIG_SYS_CBSIZE including a \0 terminator, which
72  * will always be added.
73  *
74  * The command is echoed as it is typed. Command editing is supported if
75  * CONFIG_CMDLINE_EDITING is defined. Tab auto-complete is supported if
76  * CONFIG_AUTO_COMPLETE is defined. If CONFIG_BOOT_RETRY_TIME is defined,
77  * then a timeout will be applied.
78  *
79  * If CONFIG_BOOT_RETRY_TIME is defined and retry_time >= 0,
80  * time out when time goes past endtime (timebase time in ticks).
81  *
82  * @prompt:	Prompt to display
83  * @buffer:	Place to put the line that is entered
84  * @timeout:	Timeout in milliseconds, 0 if none
85  * @return command line length excluding terminator, or -ve on error: of the
86  * timeout is exceeded (either CONFIG_BOOT_RETRY_TIME or the timeout
87  * parameter), then -2 is returned. If a break is detected (Ctrl-C) then
88  * -1 is returned.
89  */
90 int cli_readline_into_buffer(const char *const prompt, char *buffer,
91 				int timeout);
92 
93 /**
94  * parse_line() - split a command line down into separate arguments
95  *
96  * The argv[] array is filled with pointers into @line, and each argument
97  * is terminated by \0 (i.e. @line is changed in the process unless there
98  * is only one argument).
99  *
100  * #argv is terminated by a NULL after the last argument pointer.
101  *
102  * At most CONFIG_SYS_MAXARGS arguments are permited - if there are more
103  * than that then an error is printed, and this function returns
104  * CONFIG_SYS_MAXARGS, with argv[] set up to that point.
105  *
106  * @line:	Command line to parse
107  * @args:	Array to hold arguments
108  * @return number of arguments
109  */
110 int cli_simple_parse_line(char *line, char *argv[]);
111 
112 #if CONFIG_IS_ENABLED(OF_CONTROL)
113 /**
114  * cli_process_fdt() - process the boot command from the FDT
115  *
116  * If bootcmmd is defined in the /config node of the FDT, we use that
117  * as the boot command. Further, if bootsecure is set to 1 (in the same
118  * node) then we return true, indicating that the command should be executed
119  * as securely as possible, avoiding the CLI parser.
120  *
121  * @cmdp:	On entry, the command that will be executed if the FDT does
122  *		not have a command. Returns the command to execute after
123  *		checking the FDT.
124  * @return true to execute securely, else false
125  */
126 bool cli_process_fdt(const char **cmdp);
127 
128 /** cli_secure_boot_cmd() - execute a command as securely as possible
129  *
130  * This avoids using the parser, thus executing the command with the
131  * smallest amount of code. Parameters are not supported.
132  */
133 void cli_secure_boot_cmd(const char *cmd);
134 #else
cli_process_fdt(const char ** cmdp)135 static inline bool cli_process_fdt(const char **cmdp)
136 {
137 	return false;
138 }
139 
cli_secure_boot_cmd(const char * cmd)140 static inline void cli_secure_boot_cmd(const char *cmd)
141 {
142 }
143 #endif /* CONFIG_OF_CONTROL */
144 
145 /**
146  * Go into the command loop
147  *
148  * This will return if we get a timeout waiting for a command, but only for
149  * the simple parser (not hush). See CONFIG_BOOT_RETRY_TIME.
150  */
151 void cli_loop(void);
152 
153 /** Set up the command line interpreter ready for action */
154 void cli_init(void);
155 
156 #define endtick(seconds) (get_ticks() + (uint64_t)(seconds) * get_tbclk())
157 
158 #endif
159