2001-08-20 Roland McGrath <roland@frob.com>

	Support "boot script" functionality in multiboot module strings.
	* kern/bootstrap.c: Rewrite merged from oskit-branch.
	* kern/boot_script.c, kern/boot_script.h: New files,
	copied from boot/ directory in Hurd sources.
	* Makefile.in (kern-cfiles): Add boot_script.c here.
	(kern-files): Add boot_script.h here.
	* NEWS: Mention the new feature.

1 files changed, 115 insertions, 0 deletions

diff --git a/kern/boot_script.h b/kern/boot_script.h
new file mode 100644
index 0000000..c436ac2
--- /dev/null
+++ b/kern/boot_script.h
@@ -0,0 +1,115 @@
+/* Definitions for boot script parser for Mach.  */
+
+#ifndef _boot_script_h
+#define _boot_script_h
+
+/* Written by Shantanu Goel (goel@cs.columbia.edu).  */
+
+/* Error codes returned by boot_script_parse_line()
+   and boot_script_exec_cmd().  */
+#define BOOT_SCRIPT_NOMEM		1
+#define BOOT_SCRIPT_SYNTAX_ERROR	2
+#define BOOT_SCRIPT_INVALID_ASG		3
+#define BOOT_SCRIPT_MACH_ERROR		4
+#define BOOT_SCRIPT_UNDEF_SYM		5
+#define BOOT_SCRIPT_EXEC_ERROR		6
+#define BOOT_SCRIPT_INVALID_SYM		7
+#define BOOT_SCRIPT_BAD_TYPE		8
+
+/* Legal values for argument `type' to function
+   boot_script_set_variable and boot_script_define_function.  */
+#define VAL_NONE	0	/* none -- function runs at exec time */
+#define VAL_STR		1	/* string */
+#define VAL_PORT	2	/* port */
+#define VAL_TASK	3	/* task port */
+
+/* This structure describes a command.  */
+struct cmd
+{
+  /* Cookie passed in to boot_script_parse_line.  */
+  void *hook;
+
+  /* Path of executable.  */
+  char *path;
+
+  /* Task port.  */
+  task_t task;
+
+  /* Argument list.  */
+  struct arg **args;
+
+  /* Amount allocated for `args'.  */
+  int args_alloc;
+
+  /* Next available slot in `args'.  */
+  int args_index;
+
+  /* List of functions that want to be run on command execution.  */
+  struct sym **exec_funcs;
+
+  /* Amount allocated for `exec_funcs'.  */
+  int exec_funcs_alloc;
+
+  /* Next available slot in `exec_funcs'.  */
+  int exec_funcs_index;
+};
+
+
+/* The user must define these functions, we work like malloc and free.  */
+void *boot_script_malloc (unsigned int);
+void boot_script_free (void *, unsigned int);
+
+/* The user must define this function.  Load the image of the
+   executable specified by PATH in TASK.  Create a thread
+   in TASK and point it at the executable's entry point.  Initialize
+   TASK's stack with argument vector ARGV of length ARGC whose
+   strings are STRINGS.  STRINGS has length STRINGLEN.
+   Return 0 for success, non-zero otherwise.  */
+int boot_script_exec_cmd (void *hook,
+			  task_t task, char *path, int argc,
+			  char **argv, char *strings, int stringlen);
+
+/* The user must define this function.  Load the contents of FILE
+   into a fresh anonymous memory object and return the memory object port.  */
+mach_port_t boot_script_read_file (const char *file);
+
+/* The user must define this functions to perform the corresponding
+   Mach task manipulations.  */
+int boot_script_task_create (struct cmd *); /* task_create + task_suspend */
+int boot_script_task_resume (struct cmd *);
+int boot_script_prompt_task_resume (struct cmd *);
+int boot_script_insert_right (struct cmd *, mach_port_t, mach_port_t *namep);
+int boot_script_insert_task_port (struct cmd *, task_t, mach_port_t *namep);
+
+/* The user must define this function to clean up the `task_t'
+   returned by boot_script_task_create.  */
+void boot_script_free_task (task_t task, int aborting);
+
+
+/* Parse the command line LINE.  This causes the command line to be
+   converted into an internal format.  Returns 0 for success, non-zero
+   otherwise.
+
+   NOTE: The parser writes into the line so it must not be a string constant.
+   It is also the responsibility of the caller not to deallocate the line
+   across calls to the parser.  */
+int boot_script_parse_line (void *hook, char *cmdline);
+
+/* Execute the command lines prevously parsed.
+   Returns 0 for success, non-zero otherwise.  */
+int boot_script_exec (void);
+
+/* Create an entry in the symbol table for variable NAME,
+   whose type is TYPE and value is VAL.  Returns 0 on success,
+   non-zero otherwise.  */
+int boot_script_set_variable (const char *name, int type, int val);
+
+/* Define the function NAME, which will return type RET_TYPE.  */
+int boot_script_define_function (const char *name, int ret_type,
+				 int (*func) (const struct cmd *cmd, int *val));
+
+/* Returns a string describing the error ERR.  */
+char *boot_script_error_string (int err);
+
+
+#endif /* _boot_script_h */