module.h

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

/*
 * Dynamic loading of modules into the kernel.
 *
 * Modified by Bjorn Ekwall <[e-mail]>
 */

#ifndef _LINUX_MODULE_H
#define _LINUX_MODULE_H

#ifdef __GENKSYMS__
#  define _set_ver(sym,vers) sym
#  undef  MODVERSIONS
#  define MODVERSIONS
#else /* ! __GENKSYMS__ */
# if defined(MODVERSIONS) && !defined(MODULE) && defined(EXPORT_SYMTAB)
#   define _set_ver(sym,vers) sym
#   include <linux/modversions.h>
# endif
#endif /* __GENKSYMS__ */

/* values of module.state */
#define MOD_UNINITIALIZED 0
#define MOD_RUNNING 1
#define MOD_DELETED 2

/* maximum length of module name */
#define MOD_MAX_NAME 64

/* magic marker for modules inserted from kerneld, to be auto-reaped */
#define MOD_AUTOCLEAN 0x40000000 /* big enough, but no sign problems... */
#define MOD_VISITED   0x20000000 /* Thanks Jacques! */

/* maximum length of symbol name */
#define SYM_MAX_NAME 60

struct kernel_sym { /* sent to "insmod" */
	unsigned long value;		/* value of symbol */
	char name[SYM_MAX_NAME];	/* name of symbol */
};

struct module_ref {
	struct module *module;
	struct module_ref *next;
};

struct internal_symbol {
	void *addr;
	const char *name;
	};

struct symbol_table { /* received from "insmod" */
	int size; /* total, including string table!!! */
	int n_symbols;
	int n_refs;
	struct internal_symbol symbol[0]; /* actual size defined by n_symbols */
	struct module_ref ref[0]; /* actual size defined by n_refs */
};
/*
 * Note: The string table follows immediately after the symbol table in memory!
 */

struct module {
	struct module *next;
	struct module_ref *ref;	/* the list of modules that refer to me */
	struct symbol_table *symtab;
	const char *name;
	int size;			/* size of module in pages */
	void* addr;			/* address of module */
	int state;
	void (*cleanup)(void);		/* cleanup routine */
};

struct mod_routines {
	int (*init)(void);		/* initialization routine */
	void (*cleanup)(void);		/* cleanup routine */
};

/*
 * The first word of the module contains the use count.
 */
#define GET_USE_COUNT(module)	(* (long *) (module)->addr)
/*
 * define the count variable, and usage macros.
 */

#ifdef MODULE

extern long mod_use_count_;
#define MOD_INC_USE_COUNT      (mod_use_count_++, mod_use_count_ |= MOD_VISITED)
#define MOD_DEC_USE_COUNT      (mod_use_count_--, mod_use_count_ |= MOD_VISITED)
#define MOD_IN_USE	       ((mod_use_count_ & ~(MOD_AUTOCLEAN | MOD_VISITED)) != 0)

#ifndef __NO_VERSION__
#include <linux/version.h>
char kernel_version[]=UTS_RELEASE;
#endif

#if defined(MODVERSIONS) && !defined(__GENKSYMS__)
int Using_Versions; /* gcc will handle this global (used as a flag) correctly */
#endif

#else

#define MOD_INC_USE_COUNT	do { } while (0)
#define MOD_DEC_USE_COUNT	do { } while (0)
#define MOD_IN_USE		1

#endif

/* insert new symbol table */
extern int register_symtab_from(struct symbol_table *, long *);
extern void *get_module_symbol(char *, char *);
#ifdef MODULE
#define register_symtab(symtab) register_symtab_from(symtab, &mod_use_count_)
#else
#define register_symtab(symtab) register_symtab_from(symtab, 0)
#endif

#endif