The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/linux/linux.h

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    1 /*-
    2  * Copyright (c) 1994-1996 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/11.2/sys/i386/linux/linux.h 331722 2018-03-29 02:50:57Z eadler $
   29  */
   30 
   31 #ifndef _I386_LINUX_H_
   32 #define _I386_LINUX_H_
   33 
   34 #include <sys/signal.h> /* for sigval union */
   35 
   36 #include <compat/linux/linux.h>
   37 #include <i386/linux/linux_syscall.h>
   38 
   39 /*
   40  * debugging support
   41  */
   42 extern u_char linux_debug_map[];
   43 #define ldebug(name)    isclr(linux_debug_map, LINUX_SYS_linux_ ## name)
   44 #define ARGS(nm, fmt)   "linux(%ld/%ld): "#nm"("fmt")\n",                       \
   45                         (long)td->td_proc->p_pid, (long)td->td_tid
   46 #define LMSG(fmt)       "linux(%ld/%ld): "fmt"\n",                              \
   47                         (long)td->td_proc->p_pid, (long)td->td_tid
   48 #define LINUX_DTRACE    linuxulator
   49 
   50 #define LINUX_SHAREDPAGE        (VM_MAXUSER_ADDRESS - PAGE_SIZE)
   51 #define LINUX_USRSTACK          LINUX_SHAREDPAGE
   52 
   53 #define PTRIN(v)        (void *)(v)
   54 #define PTROUT(v)       (l_uintptr_t)(v)
   55 
   56 #define CP(src,dst,fld) do { (dst).fld = (src).fld; } while (0)
   57 #define CP2(src,dst,sfld,dfld) do { (dst).dfld = (src).sfld; } while (0)
   58 #define PTRIN_CP(src,dst,fld) \
   59         do { (dst).fld = PTRIN((src).fld); } while (0)
   60 
   61 /*
   62  * Provide a separate set of types for the Linux types.
   63  */
   64 typedef int             l_int;
   65 typedef int32_t         l_long;
   66 typedef int64_t         l_longlong;
   67 typedef short           l_short;
   68 typedef unsigned int    l_uint;
   69 typedef uint32_t        l_ulong;
   70 typedef uint64_t        l_ulonglong;
   71 typedef unsigned short  l_ushort;
   72 
   73 typedef char            *l_caddr_t;
   74 typedef l_ulong         l_uintptr_t;
   75 typedef l_long          l_clock_t;
   76 typedef l_int           l_daddr_t;
   77 typedef l_ushort        l_dev_t;
   78 typedef l_uint          l_gid_t;
   79 typedef l_ushort        l_gid16_t;
   80 typedef l_ulong         l_ino_t;
   81 typedef l_int           l_key_t;
   82 typedef l_longlong      l_loff_t;
   83 typedef l_ushort        l_mode_t;
   84 typedef l_long          l_off_t;
   85 typedef l_int           l_pid_t;
   86 typedef l_uint          l_size_t;
   87 typedef l_long          l_suseconds_t;
   88 typedef l_long          l_time_t;
   89 typedef l_uint          l_uid_t;
   90 typedef l_ushort        l_uid16_t;
   91 typedef l_int           l_timer_t;
   92 typedef l_int           l_mqd_t;
   93 typedef l_ulong         l_fd_mask;
   94 
   95 typedef struct {
   96         l_int           val[2];
   97 } l_fsid_t;
   98 
   99 typedef struct {
  100         l_time_t        tv_sec;
  101         l_suseconds_t   tv_usec;
  102 } l_timeval;
  103 
  104 #define l_fd_set        fd_set
  105 
  106 /*
  107  * Miscellaneous
  108  */
  109 #define LINUX_AT_COUNT          20      /* Count of used aux entry types.
  110                                          * Keep this synchronized with
  111                                          * elf_linux_fixup() code.
  112                                          */
  113 struct l___sysctl_args
  114 {
  115         l_int           *name;
  116         l_int           nlen;
  117         void            *oldval;
  118         l_size_t        *oldlenp;
  119         void            *newval;
  120         l_size_t        newlen;
  121         l_ulong         __spare[4];
  122 };
  123 
  124 /* Resource limits */
  125 #define LINUX_RLIMIT_CPU        0
  126 #define LINUX_RLIMIT_FSIZE      1
  127 #define LINUX_RLIMIT_DATA       2
  128 #define LINUX_RLIMIT_STACK      3
  129 #define LINUX_RLIMIT_CORE       4
  130 #define LINUX_RLIMIT_RSS        5
  131 #define LINUX_RLIMIT_NPROC      6
  132 #define LINUX_RLIMIT_NOFILE     7
  133 #define LINUX_RLIMIT_MEMLOCK    8
  134 #define LINUX_RLIMIT_AS         9       /* Address space limit */
  135 
  136 #define LINUX_RLIM_NLIMITS      10
  137 
  138 struct l_rlimit {
  139         l_ulong rlim_cur;
  140         l_ulong rlim_max;
  141 };
  142 
  143 struct l_mmap_argv {
  144         l_uintptr_t     addr;
  145         l_size_t        len;
  146         l_int           prot;
  147         l_int           flags;
  148         l_int           fd;
  149         l_off_t         pgoff;
  150 } __packed;
  151 
  152 /*
  153  * stat family of syscalls
  154  */
  155 struct l_timespec {
  156         l_time_t        tv_sec;
  157         l_long          tv_nsec;
  158 };
  159 
  160 struct l_newstat {
  161         l_ushort        st_dev;
  162         l_ushort        __pad1;
  163         l_ulong         st_ino;
  164         l_ushort        st_mode;
  165         l_ushort        st_nlink;
  166         l_ushort        st_uid;
  167         l_ushort        st_gid;
  168         l_ushort        st_rdev;
  169         l_ushort        __pad2;
  170         l_ulong         st_size;
  171         l_ulong         st_blksize;
  172         l_ulong         st_blocks;
  173         struct l_timespec       st_atim;
  174         struct l_timespec       st_mtim;
  175         struct l_timespec       st_ctim;
  176         l_ulong         __unused4;
  177         l_ulong         __unused5;
  178 };
  179 
  180 struct l_stat {
  181         l_ushort        st_dev;
  182         l_ulong         st_ino;
  183         l_ushort        st_mode;
  184         l_ushort        st_nlink;
  185         l_ushort        st_uid;
  186         l_ushort        st_gid;
  187         l_ushort        st_rdev;
  188         l_long          st_size;
  189         struct l_timespec       st_atim;
  190         struct l_timespec       st_mtim;
  191         struct l_timespec       st_ctim;
  192         l_long          st_blksize;
  193         l_long          st_blocks;
  194         l_ulong         st_flags;
  195         l_ulong         st_gen;
  196 };
  197 
  198 struct l_stat64 {
  199         l_ushort        st_dev;
  200         u_char          __pad0[10];
  201         l_ulong         __st_ino;
  202         l_uint          st_mode;
  203         l_uint          st_nlink;
  204         l_ulong         st_uid;
  205         l_ulong         st_gid;
  206         l_ushort        st_rdev;
  207         u_char          __pad3[10];
  208         l_longlong      st_size;
  209         l_ulong         st_blksize;
  210         l_ulong         st_blocks;
  211         l_ulong         __pad4;
  212         struct l_timespec       st_atim;
  213         struct l_timespec       st_mtim;
  214         struct l_timespec       st_ctim;
  215         l_ulonglong     st_ino;
  216 };
  217 
  218 struct l_statfs64 { 
  219         l_int           f_type; 
  220         l_int           f_bsize; 
  221         uint64_t        f_blocks; 
  222         uint64_t        f_bfree; 
  223         uint64_t        f_bavail; 
  224         uint64_t        f_files; 
  225         uint64_t        f_ffree; 
  226         l_fsid_t        f_fsid;
  227         l_int           f_namelen;
  228         l_int           f_frsize;
  229         l_int           f_flags;
  230         l_int           f_spare[4];
  231 };
  232 
  233 #define LINUX_NSIG_WORDS        2
  234 
  235 /* sigaction flags */
  236 #define LINUX_SA_NOCLDSTOP      0x00000001
  237 #define LINUX_SA_NOCLDWAIT      0x00000002
  238 #define LINUX_SA_SIGINFO        0x00000004
  239 #define LINUX_SA_RESTORER       0x04000000
  240 #define LINUX_SA_ONSTACK        0x08000000
  241 #define LINUX_SA_RESTART        0x10000000
  242 #define LINUX_SA_INTERRUPT      0x20000000
  243 #define LINUX_SA_NOMASK         0x40000000
  244 #define LINUX_SA_ONESHOT        0x80000000
  245 
  246 /* sigprocmask actions */
  247 #define LINUX_SIG_BLOCK         0
  248 #define LINUX_SIG_UNBLOCK       1
  249 #define LINUX_SIG_SETMASK       2
  250 
  251 /* sigaltstack */
  252 #define LINUX_MINSIGSTKSZ       2048
  253 
  254 typedef void    (*l_handler_t)(l_int);
  255 typedef l_ulong l_osigset_t;
  256 
  257 typedef struct {
  258         l_handler_t     lsa_handler;
  259         l_osigset_t     lsa_mask;
  260         l_ulong         lsa_flags;
  261         void    (*lsa_restorer)(void);
  262 } l_osigaction_t;
  263 
  264 typedef struct {
  265         l_handler_t     lsa_handler;
  266         l_ulong         lsa_flags;
  267         void    (*lsa_restorer)(void);
  268         l_sigset_t      lsa_mask;
  269 } l_sigaction_t;
  270 
  271 typedef struct {
  272         void            *ss_sp;
  273         l_int           ss_flags;
  274         l_size_t        ss_size;
  275 } l_stack_t;
  276 
  277 /* The Linux sigcontext, pretty much a standard 386 trapframe. */
  278 struct l_sigcontext {
  279         l_int           sc_gs;
  280         l_int           sc_fs;
  281         l_int           sc_es;
  282         l_int           sc_ds;
  283         l_int           sc_edi;
  284         l_int           sc_esi;
  285         l_int           sc_ebp;
  286         l_int           sc_esp;
  287         l_int           sc_ebx;
  288         l_int           sc_edx;
  289         l_int           sc_ecx;
  290         l_int           sc_eax;
  291         l_int           sc_trapno;
  292         l_int           sc_err;
  293         l_int           sc_eip;
  294         l_int           sc_cs;
  295         l_int           sc_eflags;
  296         l_int           sc_esp_at_signal;
  297         l_int           sc_ss;
  298         l_int           sc_387;
  299         l_int           sc_mask;
  300         l_int           sc_cr2;
  301 };
  302 
  303 struct l_ucontext {
  304         l_ulong         uc_flags;
  305         void            *uc_link;
  306         l_stack_t       uc_stack;
  307         struct l_sigcontext     uc_mcontext;
  308         l_sigset_t      uc_sigmask;
  309 };
  310 
  311 #define LINUX_SI_MAX_SIZE       128
  312 #define LINUX_SI_PAD_SIZE       ((LINUX_SI_MAX_SIZE/sizeof(l_int)) - 3)
  313 
  314 typedef union l_sigval {
  315         l_int           sival_int;
  316         l_uintptr_t     sival_ptr;
  317 } l_sigval_t;
  318 
  319 typedef struct l_siginfo {
  320         l_int           lsi_signo;
  321         l_int           lsi_errno;
  322         l_int           lsi_code;
  323         union {
  324                 l_int   _pad[LINUX_SI_PAD_SIZE];
  325 
  326                 struct {
  327                         l_pid_t         _pid;
  328                         l_uid_t         _uid;
  329                 } _kill;
  330 
  331                 struct {
  332                         l_timer_t       _tid;
  333                         l_int           _overrun;
  334                         char            _pad[sizeof(l_uid_t) - sizeof(l_int)];
  335                         l_sigval_t      _sigval;
  336                         l_int           _sys_private;
  337                 } _timer;
  338 
  339                 struct {
  340                         l_pid_t         _pid;           /* sender's pid */
  341                         l_uid_t         _uid;           /* sender's uid */
  342                         l_sigval_t      _sigval;
  343                 } _rt;
  344 
  345                 struct {
  346                         l_pid_t         _pid;           /* which child */
  347                         l_uid_t         _uid;           /* sender's uid */
  348                         l_int           _status;        /* exit code */
  349                         l_clock_t       _utime;
  350                         l_clock_t       _stime;
  351                 } _sigchld;
  352 
  353                 struct {
  354                         l_uintptr_t     _addr;  /* Faulting insn/memory ref. */
  355                 } _sigfault;
  356 
  357                 struct {
  358                         l_long          _band;  /* POLL_IN,POLL_OUT,POLL_MSG */
  359                         l_int           _fd;
  360                 } _sigpoll;
  361         } _sifields;
  362 } l_siginfo_t;
  363 
  364 #define lsi_pid         _sifields._kill._pid
  365 #define lsi_uid         _sifields._kill._uid
  366 #define lsi_tid         _sifields._timer._tid
  367 #define lsi_overrun     _sifields._timer._overrun
  368 #define lsi_sys_private _sifields._timer._sys_private
  369 #define lsi_status      _sifields._sigchld._status
  370 #define lsi_utime       _sifields._sigchld._utime
  371 #define lsi_stime       _sifields._sigchld._stime
  372 #define lsi_value       _sifields._rt._sigval
  373 #define lsi_int         _sifields._rt._sigval.sival_int
  374 #define lsi_ptr         _sifields._rt._sigval.sival_ptr
  375 #define lsi_addr        _sifields._sigfault._addr
  376 #define lsi_band        _sifields._sigpoll._band
  377 #define lsi_fd          _sifields._sigpoll._fd
  378 
  379 struct l_fpreg {
  380         u_int16_t       significand[4];
  381         u_int16_t       exponent;
  382 };
  383 
  384 struct l_fpxreg {
  385         u_int16_t       significand[4];
  386         u_int16_t       exponent;
  387         u_int16_t       padding[3];
  388 };
  389 
  390 struct l_xmmreg {
  391         u_int32_t       element[4];
  392 };
  393 
  394 struct l_fpstate {
  395         /* Regular FPU environment */
  396         u_int32_t               cw;
  397         u_int32_t               sw;
  398         u_int32_t               tag;
  399         u_int32_t               ipoff;
  400         u_int32_t               cssel;
  401         u_int32_t               dataoff;
  402         u_int32_t               datasel;
  403         struct l_fpreg          _st[8];
  404         u_int16_t               status;
  405         u_int16_t               magic;          /* 0xffff = regular FPU data */
  406 
  407         /* FXSR FPU environment */
  408         u_int32_t               _fxsr_env[6];   /* env is ignored. */
  409         u_int32_t               mxcsr;
  410         u_int32_t               reserved;
  411         struct l_fpxreg         _fxsr_st[8];    /* reg data is ignored. */
  412         struct l_xmmreg         _xmm[8];
  413         u_int32_t               padding[56];
  414 };
  415 
  416 /*
  417  * We make the stack look like Linux expects it when calling a signal
  418  * handler, but use the BSD way of calling the handler and sigreturn().
  419  * This means that we need to pass the pointer to the handler too.
  420  * It is appended to the frame to not interfere with the rest of it.
  421  */
  422 struct l_sigframe {
  423         l_int                   sf_sig;
  424         struct l_sigcontext     sf_sc;
  425         struct l_fpstate        sf_fpstate;
  426         l_uint                  sf_extramask[LINUX_NSIG_WORDS-1];
  427         l_handler_t             sf_handler;
  428 };
  429 
  430 struct l_rt_sigframe {
  431         l_int                   sf_sig;
  432         l_siginfo_t             *sf_siginfo;
  433         struct l_ucontext       *sf_ucontext;
  434         l_siginfo_t             sf_si;
  435         struct l_ucontext       sf_sc;
  436         l_handler_t             sf_handler;
  437 };
  438 
  439 extern struct sysentvec linux_sysvec;
  440 
  441 /*
  442  * arch specific open/fcntl flags
  443  */
  444 #define LINUX_F_GETLK64         12
  445 #define LINUX_F_SETLK64         13
  446 #define LINUX_F_SETLKW64        14
  447 
  448 union l_semun {
  449         l_int           val;
  450         struct l_semid_ds       *buf;
  451         l_ushort        *array;
  452         struct l_seminfo        *__buf;
  453         void            *__pad;
  454 };
  455 
  456 struct l_sockaddr {
  457         l_ushort        sa_family;
  458         char            sa_data[14];
  459 };
  460 
  461 struct l_ifmap {
  462         l_ulong         mem_start;
  463         l_ulong         mem_end;
  464         l_ushort        base_addr;
  465         u_char          irq;
  466         u_char          dma;
  467         u_char          port;
  468 };
  469 
  470 #define LINUX_IFHWADDRLEN       6
  471 #define LINUX_IFNAMSIZ          16
  472 
  473 struct l_ifreq {
  474         union {
  475                 char    ifrn_name[LINUX_IFNAMSIZ];
  476         } ifr_ifrn;
  477 
  478         union {
  479                 struct l_sockaddr       ifru_addr;
  480                 struct l_sockaddr       ifru_dstaddr;
  481                 struct l_sockaddr       ifru_broadaddr;
  482                 struct l_sockaddr       ifru_netmask;
  483                 struct l_sockaddr       ifru_hwaddr;
  484                 l_short         ifru_flags[1];
  485                 l_int           ifru_ivalue;
  486                 l_int           ifru_mtu;
  487                 struct l_ifmap  ifru_map;
  488                 char            ifru_slave[LINUX_IFNAMSIZ];
  489                 l_caddr_t       ifru_data;
  490         } ifr_ifru;
  491 };
  492 
  493 #define ifr_name        ifr_ifrn.ifrn_name      /* Interface name */
  494 #define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address */
  495 #define ifr_ifindex     ifr_ifru.ifru_ivalue    /* Interface index */
  496 
  497 /*
  498  * poll()
  499  */
  500 #define LINUX_POLLIN            0x0001
  501 #define LINUX_POLLPRI           0x0002
  502 #define LINUX_POLLOUT           0x0004
  503 #define LINUX_POLLERR           0x0008
  504 #define LINUX_POLLHUP           0x0010
  505 #define LINUX_POLLNVAL          0x0020
  506 #define LINUX_POLLRDNORM        0x0040
  507 #define LINUX_POLLRDBAND        0x0080
  508 #define LINUX_POLLWRNORM        0x0100
  509 #define LINUX_POLLWRBAND        0x0200
  510 #define LINUX_POLLMSG           0x0400
  511 
  512 struct l_pollfd {
  513         l_int           fd;
  514         l_short         events;
  515         l_short         revents;
  516 };
  517 
  518 struct l_user_desc {
  519         l_uint          entry_number;
  520         l_uint          base_addr;
  521         l_uint          limit;
  522         l_uint          seg_32bit:1;
  523         l_uint          contents:2;
  524         l_uint          read_exec_only:1;
  525         l_uint          limit_in_pages:1;
  526         l_uint          seg_not_present:1;
  527         l_uint          useable:1;
  528 };
  529 
  530 struct l_desc_struct {
  531         unsigned long   a, b;
  532 };
  533 
  534 
  535 #define LINUX_LOWERWORD 0x0000ffff
  536 
  537 /*
  538  * Macros which does the same thing as those in Linux include/asm-um/ldt-i386.h.
  539  * These convert Linux user space descriptor to machine one.
  540  */
  541 #define LINUX_LDT_entry_a(info)                                 \
  542         ((((info)->base_addr & LINUX_LOWERWORD) << 16) |        \
  543         ((info)->limit & LINUX_LOWERWORD))
  544 
  545 #define LINUX_ENTRY_B_READ_EXEC_ONLY    9
  546 #define LINUX_ENTRY_B_CONTENTS          10
  547 #define LINUX_ENTRY_B_SEG_NOT_PRESENT   15
  548 #define LINUX_ENTRY_B_BASE_ADDR         16
  549 #define LINUX_ENTRY_B_USEABLE           20
  550 #define LINUX_ENTRY_B_SEG32BIT          22
  551 #define LINUX_ENTRY_B_LIMIT             23
  552 
  553 #define LINUX_LDT_entry_b(info)                                                 \
  554         (((info)->base_addr & 0xff000000) |                                     \
  555         ((info)->limit & 0xf0000) |                                             \
  556         ((info)->contents << LINUX_ENTRY_B_CONTENTS) |                          \
  557         (((info)->seg_not_present == 0) << LINUX_ENTRY_B_SEG_NOT_PRESENT) |     \
  558         (((info)->base_addr & 0x00ff0000) >> LINUX_ENTRY_B_BASE_ADDR) |         \
  559         (((info)->read_exec_only == 0) << LINUX_ENTRY_B_READ_EXEC_ONLY) |       \
  560         ((info)->seg_32bit << LINUX_ENTRY_B_SEG32BIT) |                         \
  561         ((info)->useable << LINUX_ENTRY_B_USEABLE) |                            \
  562         ((info)->limit_in_pages << LINUX_ENTRY_B_LIMIT) | 0x7000)
  563 
  564 #define LINUX_LDT_empty(info)           \
  565         ((info)->base_addr == 0 &&      \
  566         (info)->limit == 0 &&           \
  567         (info)->contents == 0 &&        \
  568         (info)->seg_not_present == 1 && \
  569         (info)->read_exec_only == 1 &&  \
  570         (info)->seg_32bit == 0 &&       \
  571         (info)->limit_in_pages == 0 &&  \
  572         (info)->useable == 0)
  573 
  574 /*
  575  * Macros for converting segments.
  576  * They do the same as those in arch/i386/kernel/process.c in Linux.
  577  */
  578 #define LINUX_GET_BASE(desc)                            \
  579         ((((desc)->a >> 16) & LINUX_LOWERWORD) |        \
  580         (((desc)->b << 16) & 0x00ff0000) |              \
  581         ((desc)->b & 0xff000000))
  582 
  583 #define LINUX_GET_LIMIT(desc)                   \
  584         (((desc)->a & LINUX_LOWERWORD) |        \
  585         ((desc)->b & 0xf0000))
  586 
  587 #define LINUX_GET_32BIT(desc)           \
  588         (((desc)->b >> LINUX_ENTRY_B_SEG32BIT) & 1)
  589 #define LINUX_GET_CONTENTS(desc)        \
  590         (((desc)->b >> LINUX_ENTRY_B_CONTENTS) & 3)
  591 #define LINUX_GET_WRITABLE(desc)        \
  592         (((desc)->b >> LINUX_ENTRY_B_READ_EXEC_ONLY) & 1)
  593 #define LINUX_GET_LIMIT_PAGES(desc)     \
  594         (((desc)->b >> LINUX_ENTRY_B_LIMIT) & 1)
  595 #define LINUX_GET_PRESENT(desc)         \
  596         (((desc)->b >> LINUX_ENTRY_B_SEG_NOT_PRESENT) & 1)
  597 #define LINUX_GET_USEABLE(desc)         \
  598         (((desc)->b >> LINUX_ENTRY_B_USEABLE) & 1)
  599 
  600 #define linux_copyout_rusage(r, u)      copyout(r, u, sizeof(*r))
  601 
  602 /* robust futexes */
  603 struct linux_robust_list {
  604         struct linux_robust_list        *next;
  605 };
  606 
  607 struct linux_robust_list_head {
  608         struct linux_robust_list        list;
  609         l_long                          futex_offset;
  610         struct linux_robust_list        *pending_list;
  611 };
  612 
  613 #endif /* !_I386_LINUX_H_ */

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