2020 internships

U-Boot, Linux, Elixir

2020 internships

U-Boot, Linux, Elixir

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Elixir Cross Referencer

/* 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	10
#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[]);

#if defined(CONFIG_CMD_NVEDIT_EFI)
extern int do_env_print_efi(cmd_tbl_t *cmdtp, int flag, int argc,
			    char * const argv[]);
extern int do_env_set_efi(cmd_tbl_t *cmdtp, int flag, int argc,
			  char * const argv[]);
#endif

/*
 * 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 */