159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/*
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* sys/module.h
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*
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* This is a bastardized version of linux/module.h, since the latter
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* doesn't have __KERNEL__ guards where it needs them...
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*/
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#ifndef _SYS_MODULE_H
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#define _SYS_MODULE_H
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/*
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* Dynamic loading of modules into the kernel.
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*
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* Rewritten by Richard Henderson <rth@tamu.edu> Dec 1996
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*/
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#include <asm/atomic.h>
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/* Don't need to bring in all of uaccess.h just for this decl. */
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struct exception_table_entry;
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/* Used by get_kernel_syms, which is obsolete. */
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struct kernel_sym
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{
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unsigned long value;
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char name[60]; /* should have been 64-sizeof(long); oh well */
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};
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struct module_symbol
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{
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unsigned long value;
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const char *name;
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};
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struct module_ref
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{
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struct module *dep; /* "parent" pointer */
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struct module *ref; /* "child" pointer */
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struct module_ref *next_ref;
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};
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/* TBD */
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struct module_persist;
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struct module
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{
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unsigned long size_of_struct; /* == sizeof(module) */
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struct module *next;
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const char *name;
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unsigned long size;
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union
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{
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atomic_t usecount;
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long pad;
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} uc; /* Needs to keep its size - so says rth */
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unsigned long flags; /* AUTOCLEAN et al */
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unsigned nsyms;
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unsigned ndeps;
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struct module_symbol *syms;
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struct module_ref *deps;
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struct module_ref *refs;
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int (*init)(void);
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void (*cleanup)(void);
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const struct exception_table_entry *ex_table_start;
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const struct exception_table_entry *ex_table_end;
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#ifdef __alpha__
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unsigned long gp;
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#endif
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/* Members past this point are extensions to the basic
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module support and are optional. Use mod_member_present()
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to examine them. */
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const struct module_persist *persist_start;
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const struct module_persist *persist_end;
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int (*can_unload)(void);
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int runsize; /* In modutils, not currently used */
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const char *kallsyms_start; /* All symbols for kernel debugging */
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const char *kallsyms_end;
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const char *archdata_start; /* arch specific data for module */
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const char *archdata_end;
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const char *kernel_data; /* Reserved for kernel internal use */
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};
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struct module_info
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{
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unsigned long addr;
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unsigned long size;
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unsigned long flags;
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long usecount;
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};
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/* Bits of module.flags. */
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#define MOD_UNINITIALIZED 0
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#define MOD_RUNNING 1
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#define MOD_DELETED 2
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#define MOD_AUTOCLEAN 4
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#define MOD_VISITED 8
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#define MOD_USED_ONCE 16
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#define MOD_JUST_FREED 32
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#define MOD_INITIALIZING 64
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/* Values for query_module's which. */
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#define QM_MODULES 1
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#define QM_DEPS 2
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#define QM_REFS 3
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#define QM_SYMBOLS 4
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#define QM_INFO 5
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/* Can the module be queried? */
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#define MOD_CAN_QUERY(mod) (((mod)->flags & (MOD_RUNNING | MOD_INITIALIZING)) && !((mod)->flags & MOD_DELETED))
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/* When struct module is extended, we must test whether the new member
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is present in the header received from insmod before we can use it.
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This function returns true if the member is present. */
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#define mod_member_present(mod,member) \
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((unsigned long)(&((struct module *)0L)->member + 1) \
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<= (mod)->size_of_struct)
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/*
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* Ditto for archdata. Assumes mod->archdata_start and mod->archdata_end
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* are validated elsewhere.
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*/
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#define mod_archdata_member_present(mod, type, member) \
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(((unsigned long)(&((type *)0L)->member) + \
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sizeof(((type *)0L)->member)) <= \
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((mod)->archdata_end - (mod)->archdata_start))
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/* Check if an address p with number of entries n is within the body of module m */
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#define mod_bound(p, n, m) ((unsigned long)(p) >= ((unsigned long)(m) + ((m)->size_of_struct)) && \
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(unsigned long)((p)+(n)) <= (unsigned long)(m) + (m)->size)
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/* Backwards compatibility definition. */
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#define GET_USE_COUNT(module) (atomic_read(&(module)->uc.usecount))
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/* Poke the use count of a module. */
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#define __MOD_INC_USE_COUNT(mod) \
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(atomic_inc(&(mod)->uc.usecount), (mod)->flags |= MOD_VISITED|MOD_USED_ONCE)
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#define __MOD_DEC_USE_COUNT(mod) \
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(atomic_dec(&(mod)->uc.usecount), (mod)->flags |= MOD_VISITED)
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#define __MOD_IN_USE(mod) \
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(mod_member_present((mod), can_unload) && (mod)->can_unload \
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? (mod)->can_unload() : atomic_read(&(mod)->uc.usecount))
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/* Indirect stringification. */
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#define __MODULE_STRING_1(x) #x
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#define __MODULE_STRING(x) __MODULE_STRING_1(x)
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#endif /* _SYS_MODULE_H */
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