git.ozlabs.org Git - petitboot/blob - discover/grub2/grub2.h

   1 #ifndef GRUB2_H
   2 #define GRUB2_H
   3
   4 #include <discover/device-handler.h>
   5
   6 #include <stdbool.h>
   7 #include <list/list.h>
   8
   9 struct grub2_script;
  10
  11 struct grub2_word {
  12         enum {
  13                 GRUB2_WORD_TEXT,
  14                 GRUB2_WORD_VAR,
  15         } type;
  16         union {
  17                 char            *text;
  18                 const char      *name;
  19         };
  20         bool                    split;
  21         struct grub2_word       *next;
  22         struct grub2_word       *last;
  23         struct list_item        argv_list;
  24 };
  25
  26 struct grub2_argv {
  27         struct list             words;
  28
  29         /* postprocessing (with process_expansions) populates these to hand to
  30          * the grub2_command callbacks */
  31         char                    **argv;
  32         int                     argc;
  33 };
  34
  35 struct grub2_statements {
  36         struct list             list;
  37 };
  38
  39 struct grub2_statement {
  40         struct list_item        list;
  41         enum {
  42                 STMT_TYPE_SIMPLE,
  43                 STMT_TYPE_MENUENTRY,
  44                 STMT_TYPE_IF,
  45                 STMT_TYPE_BLOCK,
  46                 STMT_TYPE_CONDITIONAL,
  47         } type;
  48         int                     (*exec)(struct grub2_script *,
  49                                         struct grub2_statement *);
  50 };
  51
  52 struct grub2_statement_simple {
  53         struct grub2_statement  st;
  54         struct grub2_argv       *argv;
  55 };
  56
  57 struct grub2_statement_menuentry {
  58         struct grub2_statement  st;
  59         struct grub2_argv       *argv;
  60         struct grub2_statements *statements;
  61 };
  62
  63 struct grub2_statement_conditional {
  64         struct grub2_statement  st;
  65         struct grub2_statement  *condition;
  66         struct grub2_statements *statements;
  67 };
  68
  69 struct grub2_statement_if {
  70         struct grub2_statement  st;
  71         struct grub2_statements *conditionals;
  72         struct grub2_statements *else_case;
  73 };
  74
  75 struct grub2_statement_block {
  76         struct grub2_statement  st;
  77         struct grub2_statements *statements;
  78 };
  79
  80 struct grub2_statement_function {
  81         struct grub2_statement  st;
  82         struct grub2_word       *name;
  83         struct grub2_statements *body;
  84 };
  85
  86 struct grub2_script {
  87         struct grub2_statements         *statements;
  88         struct list                     environment;
  89         struct list                     symtab;
  90         struct discover_context         *ctx;
  91         struct discover_boot_option     *opt;
  92         unsigned int                    n_options;
  93 };
  94
  95 struct grub2_parser {
  96         void                    *scanner;
  97         struct grub2_script     *script;
  98 };
  99
 100 /* type for builtin functions */
 101 typedef int (*grub2_function)(struct grub2_script *script, void *data,
 102                                 int argc, char *argv[]);
 103
 104 struct grub2_statements *create_statements(struct grub2_parser *parser);
 105
 106 struct grub2_statement *create_statement_simple(struct grub2_parser *parser,
 107                 struct grub2_argv *argv);
 108
 109 struct grub2_statement *create_statement_menuentry(struct grub2_parser *parser,
 110                 struct grub2_argv *argv, struct grub2_statements *stmts);
 111
 112 struct grub2_statement *create_statement_conditional(
 113                 struct grub2_parser *parser, struct grub2_statement *condition,
 114                 struct grub2_statements *statements);
 115
 116 struct grub2_statement *create_statement_if(struct grub2_parser *parser,
 117                 struct grub2_statement *conditional,
 118                 struct grub2_statements *elifs,
 119                 struct grub2_statements *else_case);
 120
 121 struct grub2_statement *create_statement_block(struct grub2_parser *parser,
 122                 struct grub2_statements *stmts);
 123
 124 struct grub2_statement *create_statement_function(struct grub2_parser *parser,
 125                 struct grub2_word *name, struct grub2_statements *body);
 126
 127 struct grub2_word *create_word_text(struct grub2_parser *parser,
 128                 const char *text);
 129
 130 struct grub2_word *create_word_var(struct grub2_parser *parser,
 131                 const char *name, bool split);
 132
 133 struct grub2_argv *create_argv(struct grub2_parser *parser);
 134
 135 void statement_append(struct grub2_statements *stmts,
 136                 struct grub2_statement *stmt);
 137
 138 void argv_append(struct grub2_argv *argv, struct grub2_word *word);
 139
 140 void word_append(struct grub2_word *w1, struct grub2_word *w2);
 141
 142 /* script interface */
 143 void script_execute(struct grub2_script *script);
 144
 145 int statement_simple_execute(struct grub2_script *script,
 146                 struct grub2_statement *statement);
 147 int statement_block_execute(struct grub2_script *script,
 148                 struct grub2_statement *statement);
 149 int statement_if_execute(struct grub2_script *script,
 150                 struct grub2_statement *statement);
 151 int statement_menuentry_execute(struct grub2_script *script,
 152                 struct grub2_statement *statement);
 153 int statement_function_execute(struct grub2_script *script,
 154                 struct grub2_statement *statement);
 155
 156 struct grub2_script *create_script(struct grub2_parser *parser,
 157                 struct discover_context *ctx);
 158
 159 const char *script_env_get(struct grub2_script *script, const char *name);
 160
 161 void script_env_set(struct grub2_script *script,
 162                 const char *name, const char *value);
 163
 164 void script_register_function(struct grub2_script *script,
 165                 const char *name, grub2_function fn, void *data);
 166
 167 void register_builtins(struct grub2_script *script);
 168
 169 /* resources */
 170 struct resource *create_grub2_resource(struct discover_boot_option *opt,
 171                 struct discover_device *orig_device,
 172                 const char *root, const char *path);
 173
 174 bool resolve_grub2_resource(struct device_handler *handler,
 175                 struct resource *res);
 176
 177 /* external parser api */
 178 struct grub2_parser *grub2_parser_create(struct discover_context *ctx);
 179 void grub2_parser_parse(struct grub2_parser *parser, char *buf, int len);
 180 #endif /* GRUB2_H */
 181