bsd/sys/systm.h

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  29 /*-
  30  * Copyright (c) 1982, 1988, 1991, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  * (c) UNIX System Laboratories, Inc.
  33  * All or some portions of this file are derived from material licensed
  34  * to the University of California by American Telephone and Telegraph
  35  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  36  * the permission of UNIX System Laboratories, Inc.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)systm.h     8.7 (Berkeley) 3/29/95
  67  */
  68
  69 /*
  70  * The `securelevel' variable controls the security level of the system.
  71  * It can only be decreased by process 1 (/sbin/init).
  72  *
  73  * Security levels are as follows:
  74  *   -1 permannently insecure mode - always run system in level 0 mode.
  75  *    0 insecure mode - immutable and append-only flags make be turned off.
  76  *      All devices may be read or written subject to permission modes.
  77  *    1 secure mode - immutable and append-only flags may not be changed;
  78  *      raw disks of mounted filesystems, /dev/mem, and /dev/kmem are
  79  *      read-only.
  80  *    2 highly secure mode - same as (1) plus raw disks are always
  81  *      read-only whether mounted or not. This level precludes tampering
  82  *      with filesystems by unmounting them, but also inhibits running
  83  *      newfs while the system is secured.
  84  *
  85  * In normal operation, the system runs in level 0 mode while single user
  86  * and in level 1 mode while multiuser. If level 2 mode is desired while
  87  * running multiuser, it can be set in the multiuser startup script
  88  * (/etc/rc.local) using sysctl(1). If it is desired to run the system
  89  * in level 0 mode while multiuser, initialize the variable securelevel
  90  * in /sys/kern/kern_sysctl.c to -1. Note that it is NOT initialized to
  91  * zero as that would allow the vmunix binary to be patched to -1.
  92  * Without initialization, securelevel loads in the BSS area which only
  93  * comes into existence when the kernel is loaded and hence cannot be
  94  * patched by a stalking hacker.
  95  */
  96
  97 #ifndef _SYS_SYSTM_H_
  98 #define _SYS_SYSTM_H_
  99
 100 #include <sys/appleapiopts.h>
 101 #include <sys/cdefs.h>
 102 #include <sys/types.h>
 103 #include <sys/time.h>
 104 #include <sys/ioctl.h>
 105 #include <sys/malloc.h>
 106 #ifdef BSD_KERNEL_PRIVATE
 107 #include <sys/tty.h>
 108 #include <sys/vm.h>
 109 #endif
 110 #include <sys/proc.h>
 111 __BEGIN_DECLS
 112 #ifdef KERNEL
 113 #include <libkern/libkern.h>
 114 #endif
 115 #include <kern/thread.h>
 116 #include <kern/debug.h>
 117 __END_DECLS
 118
 119 #ifdef BSD_KERNEL_PRIVATE
 120 extern char version[];                  /* system version */
 121 extern const char copyright[];          /* system copyright */
 122
 123
 124 extern int      boothowto;      /* reboot flags, from console subsystem */
 125 extern int      show_space;
 126 extern int      minimalboot;
 127 #if CONFIG_EMBEDDED
 128 extern int      darkboot;
 129 #endif
 130
 131 extern const int nblkdev; /* number of entries in bdevsw */
 132 extern const int nchrdev; /* number of entries in cdevsw */
 133 #endif /* BSD_KERNEL_PRIVATE */
 134
 135 #ifdef KERNEL_PRIVATE
 136
 137 extern int securelevel;         /* system security level */
 138 extern dev_t rootdev;           /* root device */
 139 extern struct vnode *rootvp;    /* vnode equivalent to above */
 140
 141 #endif /* KERNEL_PRIVATE */
 142
 143 #define SYSINIT(a,b,c,d,e)
 144 #define MALLOC_DEFINE(a,b,c)
 145
 146 #define getenv_int(a,b) (*b = 0)
 147 #define KASSERT(exp,msg)
 148 /*
 149  * General function declarations.
 150  */
 151 __BEGIN_DECLS
 152
 153 #ifdef BSD_KERNEL_PRIVATE
 154 int     einval(void);
 155 void    nullsys(void);
 156 int     errsys(void);
 157 int     seltrue(dev_t dev, int which, struct proc *p);
 158 void    ttyprintf(struct tty *, const char *, ...) __printflike(2, 3);
 159 void    realitexpire(struct proc *);
 160 int     hzto(struct timeval *tv);
 161 void    tablefull(const char *);
 162 int     kvprintf(char const *, void (*)(int, void*), void *, int,
 163                       __darwin_va_list) __printflike(1,0);
 164 void    uprintf(const char *, ...) __printflike(1,2);
 165 int     copywithin(void *saddr, void *daddr, size_t len);
 166 int64_t fulong(user_addr_t addr);
 167 int     sulong(user_addr_t addr, int64_t longword);
 168 uint64_t fuulong(user_addr_t addr);
 169 int     suulong(user_addr_t addr, uint64_t ulongword);
 170 int     clone_system_shared_regions(int shared_regions_active,
 171                                     int chain_regions,
 172                                     int base_vnode);
 173 extern kern_return_t bsd_exception(int, mach_exception_data_t codes, int);
 174 extern void     bsdinit_task(void);
 175 extern void unix_syscall_return(int) __dead2;
 176 void    initclocks(void);
 177 void    startprofclock(struct proc *);
 178 void    stopprofclock(struct proc *);
 179 void    setstatclockrate(int hzrate);
 180 struct time_value;
 181 void    get_procrustime(struct time_value *tv);
 182 void    load_init_program(struct proc *p);
 183 void __pthread_testcancel(int presyscall);
 184 void throttle_info_get_last_io_time(mount_t mp, struct timeval *tv);
 185 void update_last_io_time(mount_t mp);
 186 void throttle_info_end_io(buf_t bp);
 187 #endif /* BSD_KERNEL_PRIVATE */
 188
 189 #ifdef KERNEL_PRIVATE
 190 void    timeout(void (*)(void *), void *arg, int ticks);
 191 void    timeout_with_leeway(void (*)(void *), void *arg, int ticks, int leeway_ticks);
 192 void    untimeout(void (*)(void *), void *arg);
 193 int     bsd_hostname(char *, int, int*);
 194 int     vslock(user_addr_t addr, user_size_t len);
 195 int     vsunlock(user_addr_t addr, user_size_t len, int dirtied);
 196 #endif /* KERNEL_PRIVATE */
 197
 198 int     nullop(void);
 199 int     nulldev(void);
 200 int     enoioctl(void);
 201 int     enosys(void);
 202 int     enxio(void);
 203 int     eopnotsupp(void);
 204 void    *hashinit(int count, int type, u_long *hashmask);
 205 void    ovbcopy(const void *from, void *to, size_t len);
 206 int     fubyte(user_addr_t addr);
 207 int     fuibyte(user_addr_t addr);
 208 int     subyte(user_addr_t addr, int byte);
 209 int     suibyte(user_addr_t addr, int byte);
 210 long   fuword(user_addr_t addr);
 211 long   fuiword(user_addr_t addr);
 212 int    suword(user_addr_t addr, long word);
 213 int    suiword(user_addr_t addr, long word);
 214 #define fusize(_a)      ((user_size_t)fulong(_a))
 215 #define susize(_a, _s)  sulong((_a), (_s))
 216 #define fuptr(a)        ((user_addr_t)fulong(_a)
 217 #define suptr(_a, _p)   sulong((_a), (_p))
 218 int     useracc(user_addr_t addr, user_size_t len,int prot);
 219 typedef void (*timeout_fcn_t)(void *);
 220 void    bsd_timeout(void (*)(void *), void *arg, struct timespec * ts);
 221 void    bsd_untimeout(void (*)(void *), void *arg);
 222 void    set_fsblocksize(struct vnode *);
 223 uint64_t tvtoabstime(struct timeval *);
 224 uint64_t tstoabstime(struct timespec *);
 225 void    *throttle_info_create(void);
 226 void    throttle_info_mount_ref(mount_t mp, void * throttle_info);
 227 void    throttle_info_mount_rel(mount_t mp);
 228 void    throttle_info_release(void *throttle_info);
 229 void    throttle_info_update(void *throttle_info, int flags);
 230 uint32_t throttle_lowpri_io(int sleep_amount);
 231 void    throttle_set_thread_io_policy(int policy);
 232 int             throttle_get_thread_effective_io_policy(void);
 233
 234 typedef struct __throttle_info_handle *throttle_info_handle_t;
 235 int     throttle_info_ref_by_mask(uint64_t throttle_mask, throttle_info_handle_t *throttle_info_handle);
 236 void    throttle_info_rel_by_mask(throttle_info_handle_t throttle_info_handle);
 237 void    throttle_info_update_by_mask(void *throttle_info_handle, int flags);
 238 void    throttle_info_disable_throttle(int devno, boolean_t isfusion);
 239 /*
 240  * 'throttle_info_handle' acquired via 'throttle_info_ref_by_mask'
 241  * 'policy' should be specified as either IOPOL_UTILITY or IPOL_THROTTLE,
 242  * all other values will be treated as IOPOL_NORMAL (i.e. no throttling)
 243  */
 244 int     throttle_info_io_will_be_throttled(void *throttle_info_handle, int policy);
 245
 246 #ifdef KERNEL_PRIVATE
 247
 248 /* returned by throttle_io_will_be_throttled */
 249 #define THROTTLE_DISENGAGED     0
 250 #define THROTTLE_ENGAGED        1
 251 #define THROTTLE_NOW            2
 252
 253 int  throttle_io_will_be_throttled(int lowpri_window_msecs, mount_t mp);
 254 int throttle_lowpri_window(void) __attribute__((pure));
 255 struct uthread;
 256 void throttle_info_reset_window(struct uthread *ut);
 257
 258 #endif
 259
 260 #ifdef XNU_KERNEL_PRIVATE
 261 void *exec_spawnattr_getmacpolicyinfo(const void *macextensions, const char *policyname, size_t *lenp);
 262 #endif
 263
 264 #ifdef BSD_KERNEL_PRIVATE
 265
 266 #define THROTTLE_IO_ENABLE      1
 267 #define THROTTLE_IO_DISABLE     0
 268 void sys_override_io_throttle(int flag);
 269
 270 #endif /* BSD_KERNEL_PRIVATE */
 271
 272 __END_DECLS
 273
 274 #endif /* !_SYS_SYSTM_H_ */