2 * Copyright 2000, International Business Machines Corporation and others.
5 * This software has been released under the terms of the IBM Public
6 * License. For details, see the LICENSE file in the top-level source
7 * directory or online at http://www.openafs.org/dl/license10.html
11 * Linux module support routines.
14 #include "../afs/param.h"
15 #include "../afs/sysincludes.h"
16 #include "../afs/afsincludes.h"
17 #include "../h/unistd.h" /* For syscall numbers. */
20 #include <linux/module.h>
24 asmlinkage int (*sys_settimeofdayp)(struct timeval *tv, struct timezone *tz);
25 asmlinkage int (*sys_socketcallp)(int call, long *args);
26 asmlinkage int (*sys_killp)(int pid, int signal);
27 asmlinkage int (*sys_setgroupsp)(int gidsetsize, gid_t *grouplist);
29 extern unsigned int sys_call_table[]; /* changed to uint because SPARC64 has syscaltable of 32bit items */
30 extern struct file_system_type afs_file_system;
32 static long get_page_offset(void);
34 #if defined(AFS_LINUX24_ENV)
35 DECLARE_MUTEX(afs_global_lock);
37 struct semaphore afs_global_lock = MUTEX;
39 int afs_global_owner = 0;
40 unsigned long afs_linux_page_offset = 0; /* contains the PAGE_OFFSET value */
42 /* Since sys_ni_syscall is not exported, I need to cache it in order to restore
45 static unsigned int afs_ni_syscall = 0;
47 #ifdef AFS_SPARC64_LINUX20_ENV
48 static unsigned int afs_ni_syscall32 = 0;
49 asmlinkage int (*sys_setgroupsp32)(int gidsetsize, __kernel_gid_t32 *grouplist);
50 extern unsigned int sys_call_table32[];
52 asmlinkage int afs_syscall32(long syscall, long parm1, long parm2, long parm3,
53 long parm4, long parm5)
55 __asm__ __volatile__ ("
66 #define POINTER2SYSCALL (unsigned int)(unsigned long)
67 #define SYSCALL2POINTER (void *)(long)
71 extern int afs_syscall();
72 extern int afs_xsetgroups();
73 #ifdef AFS_SPARC64_LINUX20_ENV
74 extern int afs_xsetgroups32();
77 /* obtain PAGE_OFFSET value */
78 afs_linux_page_offset = get_page_offset();
80 if (afs_linux_page_offset == 0) {
81 /* couldn't obtain page offset so can't continue */
82 printf("afs: Unable to obtain PAGE_OFFSET. Exiting..");
86 /* Initialize pointers to kernel syscalls. */
87 sys_settimeofdayp = SYSCALL2POINTER sys_call_table[__NR_settimeofday];
88 sys_socketcallp = SYSCALL2POINTER sys_call_table[__NR_socketcall];
89 sys_killp = SYSCALL2POINTER sys_call_table[__NR_kill];
91 /* setup AFS entry point. */
92 if (SYSCALL2POINTER sys_call_table[__NR_afs_syscall] == afs_syscall) {
93 printf("AFS syscall entry point already in use!\n");
98 afs_ni_syscall = sys_call_table[__NR_afs_syscall];
99 sys_call_table[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall;
100 #ifdef AFS_SPARC64_LINUX20_ENV
101 afs_ni_syscall32 = sys_call_table32[__NR_afs_syscall];
102 sys_call_table32[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall32;
106 register_filesystem(&afs_file_system);
108 /* Intercept setgroups calls */
109 sys_setgroupsp = SYSCALL2POINTER sys_call_table[__NR_setgroups];
110 sys_call_table[__NR_setgroups] = POINTER2SYSCALL afs_xsetgroups;
111 #ifdef AFS_SPARC64_LINUX20_ENV
112 sys_setgroupsp32 = SYSCALL2POINTER sys_call_table32[__NR_setgroups];
113 sys_call_table32[__NR_setgroups] = POINTER2SYSCALL afs_xsetgroups32;
119 void cleanup_module(void)
121 struct task_struct *t;
123 sys_call_table[__NR_setgroups] = POINTER2SYSCALL sys_setgroupsp;
124 sys_call_table[__NR_afs_syscall] = afs_ni_syscall;
125 #ifdef AFS_SPARC64_LINUX20_ENV
126 sys_call_table32[__NR_setgroups] = POINTER2SYSCALL sys_setgroupsp32;
127 sys_call_table32[__NR_afs_syscall] = afs_ni_syscall32;
130 unregister_filesystem(&afs_file_system);
132 osi_linux_free_inode_pages(); /* Invalidate all pages using AFS inodes. */
133 osi_linux_free_afs_memory();
138 static long get_page_offset(void)
140 #if defined(AFS_PPC_LINUX22_ENV) || defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_SPARC_LINUX20_ENV)
143 struct task_struct *p;
145 /* search backward thru the circular list */
146 for(p = current; p; p = p->prev_task)
148 return p->addr_limit.seg;