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u-boot-brain/include/command.h
Boris Brezillon c0cf06e523 command: commands: Add macros to declare commands with subcmds 
Most cmd/xxx.c source files expose several commands through a single
entry point. Some of them are doing the sub-command parsing manually in
their do_<cmd>() function, others are declaring a table of sub-commands
and then use find_cmd_tbl() to delegate the request to the sub command
handler.

In either case, the amount of code to do that is not negligible and
repetitive, not to mention that almost no commands are implementing
the auto-completion hook, which means most u-boot commands lack
auto-completion.

Provide several macros to easily define commands exposing sub-commands.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-01-15 15:28:54 -05:00

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2000-2009
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
/*
* Definitions for Command Processor
*/
#ifndef __COMMAND_H
#define __COMMAND_H
#include <linker_lists.h>
#ifndef NULL
#define NULL 0
#endif
/* Default to a width of 8 characters for help message command width */
#ifndef CONFIG_SYS_HELP_CMD_WIDTH
#define CONFIG_SYS_HELP_CMD_WIDTH 8
#endif
#ifndef __ASSEMBLY__
/*
* Monitor Command Table
*/
struct cmd_tbl_s {
char *name; /* Command Name */
int maxargs; /* maximum number of arguments */
/*
* Same as ->cmd() except the command
* tells us if it can be repeated.
* Replaces the old ->repeatable field
* which was not able to make
* repeatable property different for
* the main command and sub-commands.
*/
int (*cmd_rep)(struct cmd_tbl_s *cmd, int flags, int argc,
char * const argv[], int *repeatable);
/* Implementation function */
int (*cmd)(struct cmd_tbl_s *, int, int, char * const []);
char *usage; /* Usage message (short) */
#ifdef CONFIG_SYS_LONGHELP
char *help; /* Help message (long) */
#endif
#ifdef CONFIG_AUTO_COMPLETE
/* do auto completion on the arguments */
int (*complete)(int argc, char * const argv[], char last_char, int maxv, char *cmdv[]);
#endif
};
typedef struct cmd_tbl_s cmd_tbl_t;
#if defined(CONFIG_CMD_RUN)
extern int do_run(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
#endif
/* common/command.c */
int _do_help (cmd_tbl_t *cmd_start, int cmd_items, cmd_tbl_t * cmdtp, int
flag, int argc, char * const argv[]);
cmd_tbl_t *find_cmd(const char *cmd);
cmd_tbl_t *find_cmd_tbl (const char *cmd, cmd_tbl_t *table, int table_len);
int complete_subcmdv(cmd_tbl_t *cmdtp, int count, int argc,
char * const argv[], char last_char, int maxv,
char *cmdv[]);
extern int cmd_usage(const cmd_tbl_t *cmdtp);
/* Dummy ->cmd and ->cmd_rep wrappers. */
int cmd_always_repeatable(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[], int *repeatable);
int cmd_never_repeatable(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[], int *repeatable);
int cmd_discard_repeatable(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[]);
static inline bool cmd_is_repeatable(cmd_tbl_t *cmdtp)
{
return cmdtp->cmd_rep == cmd_always_repeatable;
}
#ifdef CONFIG_AUTO_COMPLETE
extern int var_complete(int argc, char * const argv[], char last_char, int maxv, char *cmdv[]);
extern int cmd_auto_complete(const char *const prompt, char *buf, int *np, int *colp);
#endif
/**
* cmd_process_error() - report and process a possible error
*
* @cmdtp: Command which caused the error
* @err: Error code (0 if none, -ve for error, like -EIO)
* @return 0 (CMD_RET_SUCCESS) if there is not error,
* 1 (CMD_RET_FAILURE) if an error is found
* -1 (CMD_RET_USAGE) if 'usage' error is found
*/
int cmd_process_error(cmd_tbl_t *cmdtp, int err);
/*
* Monitor Command
*
* All commands use a common argument format:
*
* void function (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
*/
#if defined(CONFIG_CMD_MEMORY) || \
defined(CONFIG_CMD_I2C) || \
defined(CONFIG_CMD_ITEST) || \
defined(CONFIG_CMD_PCI)
#define CMD_DATA_SIZE
extern int cmd_get_data_size(char* arg, int default_size);
#endif
#ifdef CONFIG_CMD_BOOTD
extern int do_bootd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
#endif
#ifdef CONFIG_CMD_BOOTM
extern int do_bootm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
extern int bootm_maybe_autostart(cmd_tbl_t *cmdtp, const char *cmd);
#else
static inline int bootm_maybe_autostart(cmd_tbl_t *cmdtp, const char *cmd)
{
return 0;
}
#endif
extern int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
extern int do_booti(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
extern int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
char *const argv[]);
extern int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
extern int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
extern unsigned long do_go_exec(ulong (*entry)(int, char * const []), int argc,
char * const argv[]);
/*
* Error codes that commands return to cmd_process(). We use the standard 0
* and 1 for success and failure, but add one more case - failure with a
* request to call cmd_usage(). But the cmd_process() function handles
* CMD_RET_USAGE itself and after calling cmd_usage() it will return 1.
* This is just a convenience for commands to avoid them having to call
* cmd_usage() all over the place.
*/
enum command_ret_t {
CMD_RET_SUCCESS, /* 0 = Success */
CMD_RET_FAILURE, /* 1 = Failure */
CMD_RET_USAGE = -1, /* Failure, please report 'usage' error */
};
/**
* Process a command with arguments. We look up the command and execute it
* if valid. Otherwise we print a usage message.
*
* @param flag Some flags normally 0 (see CMD_FLAG_.. above)
* @param argc Number of arguments (arg 0 must be the command text)
* @param argv Arguments
* @param repeatable This function sets this to 0 if the command is not
* repeatable. If the command is repeatable, the value
* is left unchanged.
* @param ticks If ticks is not null, this function set it to the
* number of ticks the command took to complete.
* @return 0 if the command succeeded, 1 if it failed
*/
int cmd_process(int flag, int argc, char * const argv[],
int *repeatable, unsigned long *ticks);
void fixup_cmdtable(cmd_tbl_t *cmdtp, int size);
/**
* board_run_command() - Fallback function to execute a command
*
* When no command line features are enabled in U-Boot, this function is
* called to execute a command. Typically the function can look at the
* command and perform a few very specific tasks, such as booting the
* system in a particular way.
*
* This function is only used when CONFIG_CMDLINE is not enabled.
*
* In normal situations this function should not return, since U-Boot will
* simply hang.
*
* @cmdline: Command line string to execute
* @return 0 if OK, 1 for error
*/
int board_run_command(const char *cmdline);
#endif /* __ASSEMBLY__ */
/*
* Command Flags:
*/
#define CMD_FLAG_REPEAT 0x0001 /* repeat last command */
#define CMD_FLAG_BOOTD 0x0002 /* command is from bootd */
#define CMD_FLAG_ENV 0x0004 /* command is from the environment */
#ifdef CONFIG_AUTO_COMPLETE
# define _CMD_COMPLETE(x) x,
#else
# define _CMD_COMPLETE(x)
#endif
#ifdef CONFIG_SYS_LONGHELP
# define _CMD_HELP(x) x,
#else
# define _CMD_HELP(x)
#endif
#ifdef CONFIG_NEEDS_MANUAL_RELOC
#define U_BOOT_SUBCMDS_RELOC(_cmdname) \
static void _cmdname##_subcmds_reloc(void) \
{ \
static int relocated; \
\
if (relocated) \
return; \
\
fixup_cmdtable(_cmdname##_subcmds, \
ARRAY_SIZE(_cmdname##_subcmds)); \
relocated = 1; \
}
#else
#define U_BOOT_SUBCMDS_RELOC(_cmdname) \
static void _cmdname##_subcmds_reloc(void) { }
#endif
#define U_BOOT_SUBCMDS_DO_CMD(_cmdname) \
static int do_##_cmdname(cmd_tbl_t *cmdtp, int flag, int argc, \
char * const argv[], int *repeatable) \
{ \
cmd_tbl_t *subcmd; \
\
_cmdname##_subcmds_reloc(); \
\
/* We need at least the cmd and subcmd names. */ \
if (argc < 2 || argc > CONFIG_SYS_MAXARGS) \
return CMD_RET_USAGE; \
\
subcmd = find_cmd_tbl(argv[1], _cmdname##_subcmds, \
ARRAY_SIZE(_cmdname##_subcmds)); \
if (!subcmd || argc - 1 > subcmd->maxargs) \
return CMD_RET_USAGE; \
\
if (flag == CMD_FLAG_REPEAT && \
!cmd_is_repeatable(subcmd)) \
return CMD_RET_SUCCESS; \
\
return subcmd->cmd_rep(subcmd, flag, argc - 1, \
argv + 1, repeatable); \
}
#ifdef CONFIG_AUTO_COMPLETE
#define U_BOOT_SUBCMDS_COMPLETE(_cmdname) \
static int complete_##_cmdname(int argc, char * const argv[], \
char last_char, int maxv, \
char *cmdv[]) \
{ \
return complete_subcmdv(_cmdname##_subcmds, \
ARRAY_SIZE(_cmdname##_subcmds), \
argc - 1, argv + 1, last_char, \
maxv, cmdv); \
}
#else
#define U_BOOT_SUBCMDS_COMPLETE(_cmdname)
#endif
#define U_BOOT_SUBCMDS(_cmdname, ...) \
static cmd_tbl_t _cmdname##_subcmds[] = { __VA_ARGS__ }; \
U_BOOT_SUBCMDS_RELOC(_cmdname) \
U_BOOT_SUBCMDS_DO_CMD(_cmdname) \
U_BOOT_SUBCMDS_COMPLETE(_cmdname)
#ifdef CONFIG_CMDLINE
#define U_BOOT_CMDREP_MKENT_COMPLETE(_name, _maxargs, _cmd_rep, \
_usage, _help, _comp) \
{ #_name, _maxargs, _cmd_rep, cmd_discard_repeatable, \
_usage, _CMD_HELP(_help) _CMD_COMPLETE(_comp) }
#define U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd, \
_usage, _help, _comp) \
{ #_name, _maxargs, \
_rep ? cmd_always_repeatable : cmd_never_repeatable, \
_cmd, _usage, _CMD_HELP(_help) _CMD_COMPLETE(_comp) }
#define U_BOOT_CMD_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, _help, _comp) \
ll_entry_declare(cmd_tbl_t, _name, cmd) = \
U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd, \
_usage, _help, _comp);
#define U_BOOT_CMDREP_COMPLETE(_name, _maxargs, _cmd_rep, _usage, \
_help, _comp) \
ll_entry_declare(cmd_tbl_t, _name, cmd) = \
U_BOOT_CMDREP_MKENT_COMPLETE(_name, _maxargs, _cmd_rep, \
_usage, _help, _comp)
#else
#define U_BOOT_SUBCMD_START(name) static cmd_tbl_t name[] = {};
#define U_BOOT_SUBCMD_END
#define _CMD_REMOVE(_name, _cmd) \
int __remove_ ## _name(void) \
{ \
if (0) \
_cmd(NULL, 0, 0, NULL); \
return 0; \
}
#define U_BOOT_CMDREP_MKENT_COMPLETE(_name, _maxargs, _cmd_rep, \
_usage, _help, _comp) \
{ #_name, _maxargs, 0 ? _cmd_rep : NULL, NULL, _usage, \
_CMD_HELP(_help) _CMD_COMPLETE(_comp) }
#define U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, \
_help, _comp) \
{ #_name, _maxargs, NULL, 0 ? _cmd : NULL, _usage, \
_CMD_HELP(_help) _CMD_COMPLETE(_comp) }
#define U_BOOT_CMD_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, _help, \
_comp) \
_CMD_REMOVE(sub_ ## _name, _cmd)
#define U_BOOT_CMDREP_COMPLETE(_name, _maxargs, _cmd_rep, _usage, \
_help, _comp) \
_CMD_REMOVE(sub_ ## _name, _cmd_rep)
#endif /* CONFIG_CMDLINE */
#define U_BOOT_CMD(_name, _maxargs, _rep, _cmd, _usage, _help) \
U_BOOT_CMD_COMPLETE(_name, _maxargs, _rep, _cmd, _usage, _help, NULL)
#define U_BOOT_CMD_MKENT(_name, _maxargs, _rep, _cmd, _usage, _help) \
U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _cmd, \
_usage, _help, NULL)
#define U_BOOT_SUBCMD_MKENT_COMPLETE(_name, _maxargs, _rep, _do_cmd, \
_comp) \
U_BOOT_CMD_MKENT_COMPLETE(_name, _maxargs, _rep, _do_cmd, \
"", "", _comp)
#define U_BOOT_SUBCMD_MKENT(_name, _maxargs, _rep, _do_cmd) \
U_BOOT_SUBCMD_MKENT_COMPLETE(_name, _maxargs, _rep, _do_cmd, \
NULL)
#define U_BOOT_CMD_WITH_SUBCMDS(_name, _usage, _help, ...) \
U_BOOT_SUBCMDS(_name, __VA_ARGS__) \
U_BOOT_CMDREP_COMPLETE(_name, CONFIG_SYS_MAXARGS, do_##_name, \
_usage, _help, complete_##_name)
#endif /* __COMMAND_H */
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