Import changeset

1 files changed, 355 insertions, 0 deletions

diff --git a/include/linux/module.h b/include/linux/module.h
new file mode 100644
index 000000000000..7f416d7fb9b7
--- /dev/null
+++ b/include/linux/module.h
@@ -0,0 +1,355 @@
+/*
+ * 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+/* Used by get_kernel_syms, which is obsolete.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)
+
+/* 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
+#define MODULE_DEVICE_TABLE(type,name)		\
+  MODULE_GENERIC_TABLE(type##_device,name)
+/* not put to .modinfo section to avoid section type conflicts */
+
+/* The attributes of a section are set the first time the section is
+   seen; we want .modinfo to not be allocated.  */
+
+__asm__(".section .modinfo\n\t.previous");
+
+/* 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_DESCRIPTION(desc)
+#define MODULE_SUPPORTED_DEVICE(name)
+#define MODULE_PARM(var,type)
+#define MODULE_PARM_DESC(var,desc)
+#define MODULE_GENERIC_TABLE(gtype,name)
+#define MODULE_DEVICE_TABLE(type,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 */
+
+/* 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
+
+#elif !defined(CONFIG_MODULES)
+
+#define __EXPORT_SYMBOL(sym,str)
+#define EXPORT_SYMBOL(var)
+#define EXPORT_SYMBOL_NOVERS(var)
+
+#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 }
+
+#if defined(MODVERSIONS) || !defined(CONFIG_MODVERSIONS)
+#define EXPORT_SYMBOL(var)  __EXPORT_SYMBOL(var, __MODULE_STRING(var))
+#else
+#define EXPORT_SYMBOL(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 __ksymtab\n.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 */