module.h
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上传日期:2013-02-24
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文件大小:13k
- /*
- * Dynamic loading of modules into the kernel.
- *
- * Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
- */
- #ifndef _LINUX_MODULE_H
- #define _LINUX_MODULE_H
- #include <linux/config.h>
- #include <linux/spinlock.h>
- #include <linux/list.h>
- #ifdef __GENKSYMS__
- # define _set_ver(sym) sym
- # undef MODVERSIONS
- # define MODVERSIONS
- #else /* ! __GENKSYMS__ */
- # if !defined(MODVERSIONS) && defined(EXPORT_SYMTAB)
- # define _set_ver(sym) sym
- # include <linux/modversions.h>
- # endif
- #endif /* __GENKSYMS__ */
- #include <asm/atomic.h>
- /* Don't need to bring in all of uaccess.h just for this decl. */
- struct exception_table_entry;
- /* Used by get_kernel_syms, which is obsolete. */
- struct kernel_sym
- {
- unsigned long value;
- char name[60]; /* should have been 64-sizeof(long); oh well */
- };
- struct module_symbol
- {
- unsigned long value;
- const char *name;
- };
- struct module_ref
- {
- struct module *dep; /* "parent" pointer */
- struct module *ref; /* "child" pointer */
- struct module_ref *next_ref;
- };
- /* TBD */
- struct module_persist;
- struct module
- {
- unsigned long size_of_struct; /* == sizeof(module) */
- struct module *next;
- const char *name;
- unsigned long size;
- union
- {
- atomic_t usecount;
- long pad;
- } uc; /* Needs to keep its size - so says rth */
- unsigned long flags; /* AUTOCLEAN et al */
- unsigned nsyms;
- unsigned ndeps;
- struct module_symbol *syms;
- struct module_ref *deps;
- struct module_ref *refs;
- int (*init)(void);
- void (*cleanup)(void);
- const struct exception_table_entry *ex_table_start;
- const struct exception_table_entry *ex_table_end;
- #ifdef __alpha__
- unsigned long gp;
- #endif
- /* Members past this point are extensions to the basic
- module support and are optional. Use mod_member_present()
- to examine them. */
- const struct module_persist *persist_start;
- const struct module_persist *persist_end;
- int (*can_unload)(void);
- int runsize; /* In modutils, not currently used */
- const char *kallsyms_start; /* All symbols for kernel debugging */
- const char *kallsyms_end;
- const char *archdata_start; /* arch specific data for module */
- const char *archdata_end;
- const char *kernel_data; /* Reserved for kernel internal use */
- };
- struct module_info
- {
- unsigned long addr;
- unsigned long size;
- unsigned long flags;
- long usecount;
- };
- /* Bits of module.flags. */
- #define MOD_UNINITIALIZED 0
- #define MOD_RUNNING 1
- #define MOD_DELETED 2
- #define MOD_AUTOCLEAN 4
- #define MOD_VISITED 8
- #define MOD_USED_ONCE 16
- #define MOD_JUST_FREED 32
- #define MOD_INITIALIZING 64
- /* Values for query_module's which. */
- #define QM_MODULES 1
- #define QM_DEPS 2
- #define QM_REFS 3
- #define QM_SYMBOLS 4
- #define QM_INFO 5
- /* Can the module be queried? */
- #define MOD_CAN_QUERY(mod) (((mod)->flags & (MOD_RUNNING | MOD_INITIALIZING)) && !((mod)->flags & MOD_DELETED))
- /* When struct module is extended, we must test whether the new member
- is present in the header received from insmod before we can use it.
- This function returns true if the member is present. */
- #define mod_member_present(mod,member)
- ((unsigned long)(&((struct module *)0L)->member + 1)
- <= (mod)->size_of_struct)
- /*
- * Ditto for archdata. Assumes mod->archdata_start and mod->archdata_end
- * are validated elsewhere.
- */
- #define mod_archdata_member_present(mod, type, member)
- (((unsigned long)(&((type *)0L)->member) +
- sizeof(((type *)0L)->member)) <=
- ((mod)->archdata_end - (mod)->archdata_start))
-
- /* Check if an address p with number of entries n is within the body of module m */
- #define mod_bound(p, n, m) ((unsigned long)(p) >= ((unsigned long)(m) + ((m)->size_of_struct)) &&
- (unsigned long)((p)+(n)) <= (unsigned long)(m) + (m)->size)
- /* Backwards compatibility definition. */
- #define GET_USE_COUNT(module) (atomic_read(&(module)->uc.usecount))
- /* Poke the use count of a module. */
- #define __MOD_INC_USE_COUNT(mod)
- (atomic_inc(&(mod)->uc.usecount), (mod)->flags |= MOD_VISITED|MOD_USED_ONCE)
- #define __MOD_DEC_USE_COUNT(mod)
- (atomic_dec(&(mod)->uc.usecount), (mod)->flags |= MOD_VISITED)
- #define __MOD_IN_USE(mod)
- (mod_member_present((mod), can_unload) && (mod)->can_unload
- ? (mod)->can_unload() : atomic_read(&(mod)->uc.usecount))
- /* Indirect stringification. */
- #define __MODULE_STRING_1(x) #x
- #define __MODULE_STRING(x) __MODULE_STRING_1(x)
- /* Generic inter module communication.
- *
- * NOTE: This interface is intended for small amounts of data that are
- * passed between two objects and either or both of the objects
- * might be compiled as modules. Do not over use this interface.
- *
- * If more than two objects need to communicate then you probably
- * need a specific interface instead of abusing this generic
- * interface. If both objects are *always* built into the kernel
- * then a global extern variable is good enough, you do not need
- * this interface.
- *
- * Keith Owens <kaos@ocs.com.au> 28 Oct 2000.
- */
- #ifdef __KERNEL__
- #define HAVE_INTER_MODULE
- extern void inter_module_register(const char *, struct module *, const void *);
- extern void inter_module_unregister(const char *);
- extern const void *inter_module_get(const char *);
- extern const void *inter_module_get_request(const char *, const char *);
- extern void inter_module_put(const char *);
- struct inter_module_entry {
- struct list_head list;
- const char *im_name;
- struct module *owner;
- const void *userdata;
- };
- extern int try_inc_mod_count(struct module *mod);
- #endif /* __KERNEL__ */
- #if defined(MODULE) && !defined(__GENKSYMS__)
- /* Embedded module documentation macros. */
- /* For documentation purposes only. */
- #define MODULE_AUTHOR(name)
- const char __module_author[] __attribute__((section(".modinfo"))) =
- "author=" name
- #define MODULE_DESCRIPTION(desc)
- const char __module_description[] __attribute__((section(".modinfo"))) =
- "description=" desc
- /* Could potentially be used by kmod... */
- #define MODULE_SUPPORTED_DEVICE(dev)
- const char __module_device[] __attribute__((section(".modinfo"))) =
- "device=" dev
- /* Used to verify parameters given to the module. The TYPE arg should
- be a string in the following format:
- [min[-max]]{b,h,i,l,s}
- The MIN and MAX specifiers delimit the length of the array. If MAX
- is omitted, it defaults to MIN; if both are omitted, the default is 1.
- The final character is a type specifier:
- b byte
- h short
- i int
- l long
- s string
- */
- #define MODULE_PARM(var,type)
- const char __module_parm_##var[]
- __attribute__((section(".modinfo"))) =
- "parm_" __MODULE_STRING(var) "=" type
- #define MODULE_PARM_DESC(var,desc)
- const char __module_parm_desc_##var[]
- __attribute__((section(".modinfo"))) =
- "parm_desc_" __MODULE_STRING(var) "=" desc
- /*
- * MODULE_DEVICE_TABLE exports information about devices
- * currently supported by this module. A device type, such as PCI,
- * is a C-like identifier passed as the first arg to this macro.
- * The second macro arg is the variable containing the device
- * information being made public.
- *
- * The following is a list of known device types (arg 1),
- * and the C types which are to be passed as arg 2.
- * pci - struct pci_device_id - List of PCI ids supported by this module
- * isapnp - struct isapnp_device_id - List of ISA PnP ids supported by this module
- * usb - struct usb_device_id - List of USB ids supported by this module
- */
- #define MODULE_GENERIC_TABLE(gtype,name)
- static const unsigned long __module_##gtype##_size
- __attribute__ ((unused)) = sizeof(struct gtype##_id);
- static const struct gtype##_id * __module_##gtype##_table
- __attribute__ ((unused)) = name
- /*
- * The following license idents are currently accepted as indicating free
- * software modules
- *
- * "GPL" [GNU Public License v2 or later]
- * "GPL and additional rights" [GNU Public License v2 rights and more]
- * "Dual BSD/GPL" [GNU Public License v2 or BSD license choice]
- * "Dual MPL/GPL" [GNU Public License v2 or Mozilla license choice]
- *
- * The following other idents are available
- *
- * "Proprietary" [Non free products]
- *
- * There are dual licensed components, but when running with Linux it is the
- * GPL that is relevant so this is a non issue. Similarly LGPL linked with GPL
- * is a GPL combined work.
- *
- * This exists for several reasons
- * 1. So modinfo can show license info for users wanting to vet their setup
- * is free
- * 2. So the community can ignore bug reports including proprietary modules
- * 3. So vendors can do likewise based on their own policies
- */
-
- #define MODULE_LICENSE(license)
- static const char __module_license[] __attribute__((section(".modinfo"))) =
- "license=" license
- /* Define the module variable, and usage macros. */
- extern struct module __this_module;
- #define THIS_MODULE (&__this_module)
- #define MOD_INC_USE_COUNT __MOD_INC_USE_COUNT(THIS_MODULE)
- #define MOD_DEC_USE_COUNT __MOD_DEC_USE_COUNT(THIS_MODULE)
- #define MOD_IN_USE __MOD_IN_USE(THIS_MODULE)
- #include <linux/version.h>
- static const char __module_kernel_version[] __attribute__((section(".modinfo"))) =
- "kernel_version=" UTS_RELEASE;
- #ifdef MODVERSIONS
- static const char __module_using_checksums[] __attribute__((section(".modinfo"))) =
- "using_checksums=1";
- #endif
- #else /* MODULE */
- #define MODULE_AUTHOR(name)
- #define MODULE_LICENSE(license)
- #define MODULE_DESCRIPTION(desc)
- #define MODULE_SUPPORTED_DEVICE(name)
- #define MODULE_PARM(var,type)
- #define MODULE_PARM_DESC(var,desc)
- /* Create a dummy reference to the table to suppress gcc unused warnings. Put
- * the reference in the .data.exit section which is discarded when code is built
- * in, so the reference does not bloat the running kernel. Note: cannot be
- * const, other exit data may be writable.
- */
- #define MODULE_GENERIC_TABLE(gtype,name)
- static const struct gtype##_id * __module_##gtype##_table
- __attribute__ ((unused, __section__(".data.exit"))) = name
- #ifndef __GENKSYMS__
- #define THIS_MODULE NULL
- #define MOD_INC_USE_COUNT do { } while (0)
- #define MOD_DEC_USE_COUNT do { } while (0)
- #define MOD_IN_USE 1
- extern struct module *module_list;
- #endif /* !__GENKSYMS__ */
- #endif /* MODULE */
- #define MODULE_DEVICE_TABLE(type,name)
- MODULE_GENERIC_TABLE(type##_device,name)
- /* Export a symbol either from the kernel or a module.
- In the kernel, the symbol is added to the kernel's global symbol table.
- In a module, it controls which variables are exported. If no
- variables are explicitly exported, the action is controled by the
- insmod -[xX] flags. Otherwise, only the variables listed are exported.
- This obviates the need for the old register_symtab() function. */
- #if defined(__GENKSYMS__)
- /* We want the EXPORT_SYMBOL tag left intact for recognition. */
- #elif !defined(AUTOCONF_INCLUDED)
- #define __EXPORT_SYMBOL(sym,str) error config_must_be_included_before_module
- #define EXPORT_SYMBOL(var) error config_must_be_included_before_module
- #define EXPORT_SYMBOL_NOVERS(var) error config_must_be_included_before_module
- #define EXPORT_SYMBOL_GPL(var) error config_must_be_included_before_module
- #elif !defined(CONFIG_MODULES)
- #define __EXPORT_SYMBOL(sym,str)
- #define EXPORT_SYMBOL(var)
- #define EXPORT_SYMBOL_NOVERS(var)
- #define EXPORT_SYMBOL_GPL(var)
- #elif !defined(EXPORT_SYMTAB)
- #define __EXPORT_SYMBOL(sym,str) error this_object_must_be_defined_as_export_objs_in_the_Makefile
- #define EXPORT_SYMBOL(var) error this_object_must_be_defined_as_export_objs_in_the_Makefile
- #define EXPORT_SYMBOL_NOVERS(var) error this_object_must_be_defined_as_export_objs_in_the_Makefile
- #define EXPORT_SYMBOL_GPL(var) error this_object_must_be_defined_as_export_objs_in_the_Makefile
- #else
- #define __EXPORT_SYMBOL(sym, str)
- const char __kstrtab_##sym[]
- __attribute__((section(".kstrtab"))) = str;
- const struct module_symbol __ksymtab_##sym
- __attribute__((section("__ksymtab"))) =
- { (unsigned long)&sym, __kstrtab_##sym }
- #define __EXPORT_SYMBOL_GPL(sym, str)
- const char __kstrtab_##sym[]
- __attribute__((section(".kstrtab"))) = "GPLONLY_" str;
- const struct module_symbol __ksymtab_##sym
- __attribute__((section("__ksymtab"))) =
- { (unsigned long)&sym, __kstrtab_##sym }
- #if defined(MODVERSIONS) || !defined(CONFIG_MODVERSIONS)
- #define EXPORT_SYMBOL(var) __EXPORT_SYMBOL(var, __MODULE_STRING(var))
- #define EXPORT_SYMBOL_GPL(var) __EXPORT_SYMBOL_GPL(var, __MODULE_STRING(var))
- #else
- #define EXPORT_SYMBOL(var) __EXPORT_SYMBOL(var, __MODULE_STRING(__VERSIONED_SYMBOL(var)))
- #define EXPORT_SYMBOL_GPL(var) __EXPORT_SYMBOL(var, __MODULE_STRING(__VERSIONED_SYMBOL(var)))
- #endif
- #define EXPORT_SYMBOL_NOVERS(var) __EXPORT_SYMBOL(var, __MODULE_STRING(var))
- #endif /* __GENKSYMS__ */
- #ifdef MODULE
- /* Force a module to export no symbols. */
- #define EXPORT_NO_SYMBOLS __asm__(".section __ksymtabn.previous")
- #else
- #define EXPORT_NO_SYMBOLS
- #endif /* MODULE */
- #ifdef CONFIG_MODULES
- #define SET_MODULE_OWNER(some_struct) do { (some_struct)->owner = THIS_MODULE; } while (0)
- #else
- #define SET_MODULE_OWNER(some_struct) do { } while (0)
- #endif
- #endif /* _LINUX_MODULE_H */