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bootloader/u-boot_2015_04/include/env_flags.h 4.09 KB
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  /*
   * (C) Copyright 2012
   * Joe Hershberger, National Instruments, joe.hershberger@ni.com
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  #ifndef __ENV_FLAGS_H__
  #define __ENV_FLAGS_H__
  
  enum env_flags_vartype {
  	env_flags_vartype_string,
  	env_flags_vartype_decimal,
  	env_flags_vartype_hex,
  	env_flags_vartype_bool,
  #ifdef CONFIG_CMD_NET
  	env_flags_vartype_ipaddr,
  	env_flags_vartype_macaddr,
  #endif
  	env_flags_vartype_end
  };
  
  enum env_flags_varaccess {
  	env_flags_varaccess_any,
  	env_flags_varaccess_readonly,
  	env_flags_varaccess_writeonce,
  	env_flags_varaccess_changedefault,
  	env_flags_varaccess_end
  };
  
  #define ENV_FLAGS_VAR ".flags"
  #define ENV_FLAGS_ATTR_MAX_LEN 2
  #define ENV_FLAGS_VARTYPE_LOC 0
  #define ENV_FLAGS_VARACCESS_LOC 1
  
  #ifndef CONFIG_ENV_FLAGS_LIST_STATIC
  #define CONFIG_ENV_FLAGS_LIST_STATIC ""
  #endif
  
  #ifdef CONFIG_CMD_NET
  #ifdef CONFIG_ENV_OVERWRITE
  #define ETHADDR_FLAGS "ethaddr:ma,"
  #else
  #ifdef CONFIG_OVERWRITE_ETHADDR_ONCE
  #define ETHADDR_FLAGS "ethaddr:mc,"
  #else
  #define ETHADDR_FLAGS "ethaddr:mo,"
  #endif
  #endif
  #else
  #define ETHADDR_FLAGS ""
  #endif
  
  #ifndef CONFIG_ENV_OVERWRITE
  #define SERIAL_FLAGS "serial#:so,"
  #else
  #define SERIAL_FLAGS ""
  #endif
  
  #define ENV_FLAGS_LIST_STATIC \
  	ETHADDR_FLAGS \
  	SERIAL_FLAGS \
  	CONFIG_ENV_FLAGS_LIST_STATIC
  
  #ifdef CONFIG_CMD_ENV_FLAGS
  /*
   * Print the whole list of available type flags.
   */
  void env_flags_print_vartypes(void);
  /*
   * Print the whole list of available access flags.
   */
  void env_flags_print_varaccess(void);
  /*
   * Return the name of the type.
   */
  const char *env_flags_get_vartype_name(enum env_flags_vartype type);
  /*
   * Return the name of the access.
   */
  const char *env_flags_get_varaccess_name(enum env_flags_varaccess access);
  #endif
  
  /*
   * Parse the flags string from a .flags attribute list into the vartype enum.
   */
  enum env_flags_vartype env_flags_parse_vartype(const char *flags);
  /*
   * Parse the flags string from a .flags attribute list into the varaccess enum.
   */
  enum env_flags_varaccess env_flags_parse_varaccess(const char *flags);
  /*
   * Parse the binary flags from a hash table entry into the varaccess enum.
   */
  enum env_flags_varaccess env_flags_parse_varaccess_from_binflags(int binflags);
  
  #ifdef USE_HOSTCC
  /*
   * Look up the type of a variable directly from the .flags var.
   */
  enum env_flags_vartype env_flags_get_type(const char *name);
  /*
   * Look up the access of a variable directly from the .flags var.
   */
  enum env_flags_varaccess env_flags_get_access(const char *name);
  /*
   * Validate the newval for its type to conform with the requirements defined by
   * its flags (directly looked at the .flags var).
   */
  int env_flags_validate_type(const char *name, const char *newval);
  /*
   * Validate the newval for its access to conform with the requirements defined
   * by its flags (directly looked at the .flags var).
   */
  int env_flags_validate_access(const char *name, int check_mask);
  /*
   * Validate that the proposed access to variable "name" is valid according to
   * the defined flags for that variable, if any.
   */
  int env_flags_validate_varaccess(const char *name, int check_mask);
  /*
   * Validate the parameters passed to "env set" for type compliance
   */
  int env_flags_validate_env_set_params(int argc, char * const argv[]);
  
  #else /* !USE_HOSTCC */
  
  #include <search.h>
  
  /*
   * When adding a variable to the environment, initialize the flags for that
   * variable.
   */
  void env_flags_init(ENTRY *var_entry);
  
  /*
   * Validate the newval for to conform with the requirements defined by its flags
   */
  int env_flags_validate(const ENTRY *item, const char *newval, enum env_op op,
  	int flag);
  
  #endif /* USE_HOSTCC */
  
  /*
   * These are the binary flags used in the environment entry->flags variable to
   * decribe properties of veriables in the table
   */
  #define ENV_FLAGS_VARTYPE_BIN_MASK			0x00000007
  /* The actual variable type values use the enum value (within the mask) */
  #define ENV_FLAGS_VARACCESS_PREVENT_DELETE		0x00000008
  #define ENV_FLAGS_VARACCESS_PREVENT_CREATE		0x00000010
  #define ENV_FLAGS_VARACCESS_PREVENT_OVERWR		0x00000020
  #define ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR	0x00000040
  #define ENV_FLAGS_VARACCESS_BIN_MASK			0x00000078
  
  #endif /* __ENV_FLAGS_H__ */