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: stable/10/sys/i386/linux/linux.h 302964 2016-07-17 15:23:32Z dchagin $
   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_spare[6];
  229 };
  230 
  231 #define LINUX_NSIG_WORDS        2
  232 
  233 /* sigaction flags */
  234 #define LINUX_SA_NOCLDSTOP      0x00000001
  235 #define LINUX_SA_NOCLDWAIT      0x00000002
  236 #define LINUX_SA_SIGINFO        0x00000004
  237 #define LINUX_SA_RESTORER       0x04000000
  238 #define LINUX_SA_ONSTACK        0x08000000
  239 #define LINUX_SA_RESTART        0x10000000
  240 #define LINUX_SA_INTERRUPT      0x20000000
  241 #define LINUX_SA_NOMASK         0x40000000
  242 #define LINUX_SA_ONESHOT        0x80000000
  243 
  244 /* sigprocmask actions */
  245 #define LINUX_SIG_BLOCK         0
  246 #define LINUX_SIG_UNBLOCK       1
  247 #define LINUX_SIG_SETMASK       2
  248 
  249 /* sigaltstack */
  250 #define LINUX_MINSIGSTKSZ       2048
  251 
  252 typedef void    (*l_handler_t)(l_int);
  253 typedef l_ulong l_osigset_t;
  254 
  255 typedef struct {
  256         l_handler_t     lsa_handler;
  257         l_osigset_t     lsa_mask;
  258         l_ulong         lsa_flags;
  259         void    (*lsa_restorer)(void);
  260 } l_osigaction_t;
  261 
  262 typedef struct {
  263         l_handler_t     lsa_handler;
  264         l_ulong         lsa_flags;
  265         void    (*lsa_restorer)(void);
  266         l_sigset_t      lsa_mask;
  267 } l_sigaction_t;
  268 
  269 typedef struct {
  270         void            *ss_sp;
  271         l_int           ss_flags;
  272         l_size_t        ss_size;
  273 } l_stack_t;
  274 
  275 /* The Linux sigcontext, pretty much a standard 386 trapframe. */
  276 struct l_sigcontext {
  277         l_int           sc_gs;
  278         l_int           sc_fs;
  279         l_int           sc_es;
  280         l_int           sc_ds;
  281         l_int           sc_edi;
  282         l_int           sc_esi;
  283         l_int           sc_ebp;
  284         l_int           sc_esp;
  285         l_int           sc_ebx;
  286         l_int           sc_edx;
  287         l_int           sc_ecx;
  288         l_int           sc_eax;
  289         l_int           sc_trapno;
  290         l_int           sc_err;
  291         l_int           sc_eip;
  292         l_int           sc_cs;
  293         l_int           sc_eflags;
  294         l_int           sc_esp_at_signal;
  295         l_int           sc_ss;
  296         l_int           sc_387;
  297         l_int           sc_mask;
  298         l_int           sc_cr2;
  299 };
  300 
  301 struct l_ucontext {
  302         l_ulong         uc_flags;
  303         void            *uc_link;
  304         l_stack_t       uc_stack;
  305         struct l_sigcontext     uc_mcontext;
  306         l_sigset_t      uc_sigmask;
  307 };
  308 
  309 #define LINUX_SI_MAX_SIZE       128
  310 #define LINUX_SI_PAD_SIZE       ((LINUX_SI_MAX_SIZE/sizeof(l_int)) - 3)
  311 
  312 typedef union l_sigval {
  313         l_int           sival_int;
  314         l_uintptr_t     sival_ptr;
  315 } l_sigval_t;
  316 
  317 typedef struct l_siginfo {
  318         l_int           lsi_signo;
  319         l_int           lsi_errno;
  320         l_int           lsi_code;
  321         union {
  322                 l_int   _pad[LINUX_SI_PAD_SIZE];
  323 
  324                 struct {
  325                         l_pid_t         _pid;
  326                         l_uid_t         _uid;
  327                 } _kill;
  328 
  329                 struct {
  330                         l_timer_t       _tid;
  331                         l_int           _overrun;
  332                         char            _pad[sizeof(l_uid_t) - sizeof(l_int)];
  333                         l_sigval_t      _sigval;
  334                         l_int           _sys_private;
  335                 } _timer;
  336 
  337                 struct {
  338                         l_pid_t         _pid;           /* sender's pid */
  339                         l_uid_t         _uid;           /* sender's uid */
  340                         l_sigval_t      _sigval;
  341                 } _rt;
  342 
  343                 struct {
  344                         l_pid_t         _pid;           /* which child */
  345                         l_uid_t         _uid;           /* sender's uid */
  346                         l_int           _status;        /* exit code */
  347                         l_clock_t       _utime;
  348                         l_clock_t       _stime;
  349                 } _sigchld;
  350 
  351                 struct {
  352                         l_uintptr_t     _addr;  /* Faulting insn/memory ref. */
  353                 } _sigfault;
  354 
  355                 struct {
  356                         l_long          _band;  /* POLL_IN,POLL_OUT,POLL_MSG */
  357                         l_int           _fd;
  358                 } _sigpoll;
  359         } _sifields;
  360 } l_siginfo_t;
  361 
  362 #define lsi_pid         _sifields._kill._pid
  363 #define lsi_uid         _sifields._kill._uid
  364 #define lsi_tid         _sifields._timer._tid
  365 #define lsi_overrun     _sifields._timer._overrun
  366 #define lsi_sys_private _sifields._timer._sys_private
  367 #define lsi_status      _sifields._sigchld._status
  368 #define lsi_utime       _sifields._sigchld._utime
  369 #define lsi_stime       _sifields._sigchld._stime
  370 #define lsi_value       _sifields._rt._sigval
  371 #define lsi_int         _sifields._rt._sigval.sival_int
  372 #define lsi_ptr         _sifields._rt._sigval.sival_ptr
  373 #define lsi_addr        _sifields._sigfault._addr
  374 #define lsi_band        _sifields._sigpoll._band
  375 #define lsi_fd          _sifields._sigpoll._fd
  376 
  377 struct l_fpreg {
  378         u_int16_t       significand[4];
  379         u_int16_t       exponent;
  380 };
  381 
  382 struct l_fpxreg {
  383         u_int16_t       significand[4];
  384         u_int16_t       exponent;
  385         u_int16_t       padding[3];
  386 };
  387 
  388 struct l_xmmreg {
  389         u_int32_t       element[4];
  390 };
  391 
  392 struct l_fpstate {
  393         /* Regular FPU environment */
  394         u_int32_t               cw;
  395         u_int32_t               sw;
  396         u_int32_t               tag;
  397         u_int32_t               ipoff;
  398         u_int32_t               cssel;
  399         u_int32_t               dataoff;
  400         u_int32_t               datasel;
  401         struct l_fpreg          _st[8];
  402         u_int16_t               status;
  403         u_int16_t               magic;          /* 0xffff = regular FPU data */
  404 
  405         /* FXSR FPU environment */
  406         u_int32_t               _fxsr_env[6];   /* env is ignored. */
  407         u_int32_t               mxcsr;
  408         u_int32_t               reserved;
  409         struct l_fpxreg         _fxsr_st[8];    /* reg data is ignored. */
  410         struct l_xmmreg         _xmm[8];
  411         u_int32_t               padding[56];
  412 };
  413 
  414 /*
  415  * We make the stack look like Linux expects it when calling a signal
  416  * handler, but use the BSD way of calling the handler and sigreturn().
  417  * This means that we need to pass the pointer to the handler too.
  418  * It is appended to the frame to not interfere with the rest of it.
  419  */
  420 struct l_sigframe {
  421         l_int                   sf_sig;
  422         struct l_sigcontext     sf_sc;
  423         struct l_fpstate        sf_fpstate;
  424         l_uint                  sf_extramask[LINUX_NSIG_WORDS-1];
  425         l_handler_t             sf_handler;
  426 };
  427 
  428 struct l_rt_sigframe {
  429         l_int                   sf_sig;
  430         l_siginfo_t             *sf_siginfo;
  431         struct l_ucontext       *sf_ucontext;
  432         l_siginfo_t             sf_si;
  433         struct l_ucontext       sf_sc;
  434         l_handler_t             sf_handler;
  435 };
  436 
  437 extern struct sysentvec linux_sysvec;
  438 
  439 /*
  440  * arch specific open/fcntl flags
  441  */
  442 #define LINUX_F_GETLK64         12
  443 #define LINUX_F_SETLK64         13
  444 #define LINUX_F_SETLKW64        14
  445 
  446 union l_semun {
  447         l_int           val;
  448         struct l_semid_ds       *buf;
  449         l_ushort        *array;
  450         struct l_seminfo        *__buf;
  451         void            *__pad;
  452 };
  453 
  454 struct l_ipc_perm {
  455         l_key_t         key;
  456         l_uid16_t       uid;
  457         l_gid16_t       gid;
  458         l_uid16_t       cuid;
  459         l_gid16_t       cgid;
  460         l_ushort        mode;
  461         l_ushort        seq;
  462 };
  463 
  464 /*
  465  * Socket defines
  466  */
  467 #define LINUX_SOL_SOCKET        1
  468 #define LINUX_SOL_IP            0
  469 #define LINUX_SOL_IPX           256
  470 #define LINUX_SOL_AX25          257
  471 #define LINUX_SOL_TCP           6
  472 #define LINUX_SOL_UDP           17
  473 
  474 #define LINUX_SO_DEBUG          1
  475 #define LINUX_SO_REUSEADDR      2
  476 #define LINUX_SO_TYPE           3
  477 #define LINUX_SO_ERROR          4
  478 #define LINUX_SO_DONTROUTE      5
  479 #define LINUX_SO_BROADCAST      6
  480 #define LINUX_SO_SNDBUF         7
  481 #define LINUX_SO_RCVBUF         8
  482 #define LINUX_SO_KEEPALIVE      9
  483 #define LINUX_SO_OOBINLINE      10
  484 #define LINUX_SO_NO_CHECK       11
  485 #define LINUX_SO_PRIORITY       12
  486 #define LINUX_SO_LINGER         13
  487 #define LINUX_SO_PEERCRED       17
  488 #define LINUX_SO_RCVLOWAT       18
  489 #define LINUX_SO_SNDLOWAT       19
  490 #define LINUX_SO_RCVTIMEO       20
  491 #define LINUX_SO_SNDTIMEO       21
  492 #define LINUX_SO_TIMESTAMP      29
  493 #define LINUX_SO_ACCEPTCONN     30
  494 
  495 struct l_sockaddr {
  496         l_ushort        sa_family;
  497         char            sa_data[14];
  498 };
  499 
  500 struct l_ifmap {
  501         l_ulong         mem_start;
  502         l_ulong         mem_end;
  503         l_ushort        base_addr;
  504         u_char          irq;
  505         u_char          dma;
  506         u_char          port;
  507 };
  508 
  509 #define LINUX_IFHWADDRLEN       6
  510 #define LINUX_IFNAMSIZ          16
  511 
  512 struct l_ifreq {
  513         union {
  514                 char    ifrn_name[LINUX_IFNAMSIZ];
  515         } ifr_ifrn;
  516 
  517         union {
  518                 struct l_sockaddr       ifru_addr;
  519                 struct l_sockaddr       ifru_dstaddr;
  520                 struct l_sockaddr       ifru_broadaddr;
  521                 struct l_sockaddr       ifru_netmask;
  522                 struct l_sockaddr       ifru_hwaddr;
  523                 l_short         ifru_flags[1];
  524                 l_int           ifru_metric;
  525                 l_int           ifru_mtu;
  526                 struct l_ifmap  ifru_map;
  527                 char            ifru_slave[LINUX_IFNAMSIZ];
  528                 l_caddr_t       ifru_data;
  529         } ifr_ifru;
  530 };
  531 
  532 #define ifr_name        ifr_ifrn.ifrn_name      /* Interface name */
  533 #define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address */
  534 
  535 /*
  536  * poll()
  537  */
  538 #define LINUX_POLLIN            0x0001
  539 #define LINUX_POLLPRI           0x0002
  540 #define LINUX_POLLOUT           0x0004
  541 #define LINUX_POLLERR           0x0008
  542 #define LINUX_POLLHUP           0x0010
  543 #define LINUX_POLLNVAL          0x0020
  544 #define LINUX_POLLRDNORM        0x0040
  545 #define LINUX_POLLRDBAND        0x0080
  546 #define LINUX_POLLWRNORM        0x0100
  547 #define LINUX_POLLWRBAND        0x0200
  548 #define LINUX_POLLMSG           0x0400
  549 
  550 struct l_pollfd {
  551         l_int           fd;
  552         l_short         events;
  553         l_short         revents;
  554 };
  555 
  556 struct l_user_desc {
  557         l_uint          entry_number;
  558         l_uint          base_addr;
  559         l_uint          limit;
  560         l_uint          seg_32bit:1;
  561         l_uint          contents:2;
  562         l_uint          read_exec_only:1;
  563         l_uint          limit_in_pages:1;
  564         l_uint          seg_not_present:1;
  565         l_uint          useable:1;
  566 };
  567 
  568 struct l_desc_struct {
  569         unsigned long   a, b;
  570 };
  571 
  572 
  573 #define LINUX_LOWERWORD 0x0000ffff
  574 
  575 /*
  576  * Macros which does the same thing as those in Linux include/asm-um/ldt-i386.h.
  577  * These convert Linux user space descriptor to machine one.
  578  */
  579 #define LINUX_LDT_entry_a(info)                                 \
  580         ((((info)->base_addr & LINUX_LOWERWORD) << 16) |        \
  581         ((info)->limit & LINUX_LOWERWORD))
  582 
  583 #define LINUX_ENTRY_B_READ_EXEC_ONLY    9
  584 #define LINUX_ENTRY_B_CONTENTS          10
  585 #define LINUX_ENTRY_B_SEG_NOT_PRESENT   15
  586 #define LINUX_ENTRY_B_BASE_ADDR         16
  587 #define LINUX_ENTRY_B_USEABLE           20
  588 #define LINUX_ENTRY_B_SEG32BIT          22
  589 #define LINUX_ENTRY_B_LIMIT             23
  590 
  591 #define LINUX_LDT_entry_b(info)                                                 \
  592         (((info)->base_addr & 0xff000000) |                                     \
  593         ((info)->limit & 0xf0000) |                                             \
  594         ((info)->contents << LINUX_ENTRY_B_CONTENTS) |                          \
  595         (((info)->seg_not_present == 0) << LINUX_ENTRY_B_SEG_NOT_PRESENT) |     \
  596         (((info)->base_addr & 0x00ff0000) >> LINUX_ENTRY_B_BASE_ADDR) |         \
  597         (((info)->read_exec_only == 0) << LINUX_ENTRY_B_READ_EXEC_ONLY) |       \
  598         ((info)->seg_32bit << LINUX_ENTRY_B_SEG32BIT) |                         \
  599         ((info)->useable << LINUX_ENTRY_B_USEABLE) |                            \
  600         ((info)->limit_in_pages << LINUX_ENTRY_B_LIMIT) | 0x7000)
  601 
  602 #define LINUX_LDT_empty(info)           \
  603         ((info)->base_addr == 0 &&      \
  604         (info)->limit == 0 &&           \
  605         (info)->contents == 0 &&        \
  606         (info)->seg_not_present == 1 && \
  607         (info)->read_exec_only == 1 &&  \
  608         (info)->seg_32bit == 0 &&       \
  609         (info)->limit_in_pages == 0 &&  \
  610         (info)->useable == 0)
  611 
  612 /*
  613  * Macros for converting segments.
  614  * They do the same as those in arch/i386/kernel/process.c in Linux.
  615  */
  616 #define LINUX_GET_BASE(desc)                            \
  617         ((((desc)->a >> 16) & LINUX_LOWERWORD) |        \
  618         (((desc)->b << 16) & 0x00ff0000) |              \
  619         ((desc)->b & 0xff000000))
  620 
  621 #define LINUX_GET_LIMIT(desc)                   \
  622         (((desc)->a & LINUX_LOWERWORD) |        \
  623         ((desc)->b & 0xf0000))
  624 
  625 #define LINUX_GET_32BIT(desc)           \
  626         (((desc)->b >> LINUX_ENTRY_B_SEG32BIT) & 1)
  627 #define LINUX_GET_CONTENTS(desc)        \
  628         (((desc)->b >> LINUX_ENTRY_B_CONTENTS) & 3)
  629 #define LINUX_GET_WRITABLE(desc)        \
  630         (((desc)->b >> LINUX_ENTRY_B_READ_EXEC_ONLY) & 1)
  631 #define LINUX_GET_LIMIT_PAGES(desc)     \
  632         (((desc)->b >> LINUX_ENTRY_B_LIMIT) & 1)
  633 #define LINUX_GET_PRESENT(desc)         \
  634         (((desc)->b >> LINUX_ENTRY_B_SEG_NOT_PRESENT) & 1)
  635 #define LINUX_GET_USEABLE(desc)         \
  636         (((desc)->b >> LINUX_ENTRY_B_USEABLE) & 1)
  637 
  638 #define linux_copyout_rusage(r, u)      copyout(r, u, sizeof(*r))
  639 
  640 /* robust futexes */
  641 struct linux_robust_list {
  642         struct linux_robust_list        *next;
  643 };
  644 
  645 struct linux_robust_list_head {
  646         struct linux_robust_list        list;
  647         l_long                          futex_offset;
  648         struct linux_robust_list        *pending_list;
  649 };
  650 
  651 #endif /* !_I386_LINUX_H_ */

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