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/10.3/sys/i386/linux/linux.h 293587 2016-01-09 17:49:05Z 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 /* mmap options */
  144 #define LINUX_MAP_SHARED        0x0001
  145 #define LINUX_MAP_PRIVATE       0x0002
  146 #define LINUX_MAP_FIXED         0x0010
  147 #define LINUX_MAP_ANON          0x0020
  148 #define LINUX_MAP_GROWSDOWN     0x0100
  149 
  150 struct l_mmap_argv {
  151         l_uintptr_t     addr;
  152         l_size_t        len;
  153         l_int           prot;
  154         l_int           flags;
  155         l_int           fd;
  156         l_off_t         pgoff;
  157 } __packed;
  158 
  159 /*
  160  * stat family of syscalls
  161  */
  162 struct l_timespec {
  163         l_time_t        tv_sec;
  164         l_long          tv_nsec;
  165 };
  166 
  167 struct l_newstat {
  168         l_ushort        st_dev;
  169         l_ushort        __pad1;
  170         l_ulong         st_ino;
  171         l_ushort        st_mode;
  172         l_ushort        st_nlink;
  173         l_ushort        st_uid;
  174         l_ushort        st_gid;
  175         l_ushort        st_rdev;
  176         l_ushort        __pad2;
  177         l_ulong         st_size;
  178         l_ulong         st_blksize;
  179         l_ulong         st_blocks;
  180         struct l_timespec       st_atim;
  181         struct l_timespec       st_mtim;
  182         struct l_timespec       st_ctim;
  183         l_ulong         __unused4;
  184         l_ulong         __unused5;
  185 };
  186 
  187 struct l_stat {
  188         l_ushort        st_dev;
  189         l_ulong         st_ino;
  190         l_ushort        st_mode;
  191         l_ushort        st_nlink;
  192         l_ushort        st_uid;
  193         l_ushort        st_gid;
  194         l_ushort        st_rdev;
  195         l_long          st_size;
  196         struct l_timespec       st_atim;
  197         struct l_timespec       st_mtim;
  198         struct l_timespec       st_ctim;
  199         l_long          st_blksize;
  200         l_long          st_blocks;
  201         l_ulong         st_flags;
  202         l_ulong         st_gen;
  203 };
  204 
  205 struct l_stat64 {
  206         l_ushort        st_dev;
  207         u_char          __pad0[10];
  208         l_ulong         __st_ino;
  209         l_uint          st_mode;
  210         l_uint          st_nlink;
  211         l_ulong         st_uid;
  212         l_ulong         st_gid;
  213         l_ushort        st_rdev;
  214         u_char          __pad3[10];
  215         l_longlong      st_size;
  216         l_ulong         st_blksize;
  217         l_ulong         st_blocks;
  218         l_ulong         __pad4;
  219         struct l_timespec       st_atim;
  220         struct l_timespec       st_mtim;
  221         struct l_timespec       st_ctim;
  222         l_ulonglong     st_ino;
  223 };
  224 
  225 struct l_statfs64 { 
  226         l_int           f_type; 
  227         l_int           f_bsize; 
  228         uint64_t        f_blocks; 
  229         uint64_t        f_bfree; 
  230         uint64_t        f_bavail; 
  231         uint64_t        f_files; 
  232         uint64_t        f_ffree; 
  233         l_fsid_t        f_fsid;
  234         l_int           f_namelen;
  235         l_int           f_spare[6];
  236 };
  237 
  238 #define LINUX_NSIG_WORDS        2
  239 
  240 /* sigaction flags */
  241 #define LINUX_SA_NOCLDSTOP      0x00000001
  242 #define LINUX_SA_NOCLDWAIT      0x00000002
  243 #define LINUX_SA_SIGINFO        0x00000004
  244 #define LINUX_SA_RESTORER       0x04000000
  245 #define LINUX_SA_ONSTACK        0x08000000
  246 #define LINUX_SA_RESTART        0x10000000
  247 #define LINUX_SA_INTERRUPT      0x20000000
  248 #define LINUX_SA_NOMASK         0x40000000
  249 #define LINUX_SA_ONESHOT        0x80000000
  250 
  251 /* sigprocmask actions */
  252 #define LINUX_SIG_BLOCK         0
  253 #define LINUX_SIG_UNBLOCK       1
  254 #define LINUX_SIG_SETMASK       2
  255 
  256 /* sigaltstack */
  257 #define LINUX_MINSIGSTKSZ       2048
  258 
  259 typedef void    (*l_handler_t)(l_int);
  260 typedef l_ulong l_osigset_t;
  261 
  262 typedef struct {
  263         l_handler_t     lsa_handler;
  264         l_osigset_t     lsa_mask;
  265         l_ulong         lsa_flags;
  266         void    (*lsa_restorer)(void);
  267 } l_osigaction_t;
  268 
  269 typedef struct {
  270         l_handler_t     lsa_handler;
  271         l_ulong         lsa_flags;
  272         void    (*lsa_restorer)(void);
  273         l_sigset_t      lsa_mask;
  274 } l_sigaction_t;
  275 
  276 typedef struct {
  277         void            *ss_sp;
  278         l_int           ss_flags;
  279         l_size_t        ss_size;
  280 } l_stack_t;
  281 
  282 /* The Linux sigcontext, pretty much a standard 386 trapframe. */
  283 struct l_sigcontext {
  284         l_int           sc_gs;
  285         l_int           sc_fs;
  286         l_int           sc_es;
  287         l_int           sc_ds;
  288         l_int           sc_edi;
  289         l_int           sc_esi;
  290         l_int           sc_ebp;
  291         l_int           sc_esp;
  292         l_int           sc_ebx;
  293         l_int           sc_edx;
  294         l_int           sc_ecx;
  295         l_int           sc_eax;
  296         l_int           sc_trapno;
  297         l_int           sc_err;
  298         l_int           sc_eip;
  299         l_int           sc_cs;
  300         l_int           sc_eflags;
  301         l_int           sc_esp_at_signal;
  302         l_int           sc_ss;
  303         l_int           sc_387;
  304         l_int           sc_mask;
  305         l_int           sc_cr2;
  306 };
  307 
  308 struct l_ucontext {
  309         l_ulong         uc_flags;
  310         void            *uc_link;
  311         l_stack_t       uc_stack;
  312         struct l_sigcontext     uc_mcontext;
  313         l_sigset_t      uc_sigmask;
  314 };
  315 
  316 #define LINUX_SI_MAX_SIZE       128
  317 #define LINUX_SI_PAD_SIZE       ((LINUX_SI_MAX_SIZE/sizeof(l_int)) - 3)
  318 
  319 typedef union l_sigval {
  320         l_int           sival_int;
  321         l_uintptr_t     sival_ptr;
  322 } l_sigval_t;
  323 
  324 typedef struct l_siginfo {
  325         l_int           lsi_signo;
  326         l_int           lsi_errno;
  327         l_int           lsi_code;
  328         union {
  329                 l_int   _pad[LINUX_SI_PAD_SIZE];
  330 
  331                 struct {
  332                         l_pid_t         _pid;
  333                         l_uid_t         _uid;
  334                 } _kill;
  335 
  336                 struct {
  337                         l_timer_t       _tid;
  338                         l_int           _overrun;
  339                         char            _pad[sizeof(l_uid_t) - sizeof(l_int)];
  340                         l_sigval_t      _sigval;
  341                         l_int           _sys_private;
  342                 } _timer;
  343 
  344                 struct {
  345                         l_pid_t         _pid;           /* sender's pid */
  346                         l_uid_t         _uid;           /* sender's uid */
  347                         l_sigval_t      _sigval;
  348                 } _rt;
  349 
  350                 struct {
  351                         l_pid_t         _pid;           /* which child */
  352                         l_uid_t         _uid;           /* sender's uid */
  353                         l_int           _status;        /* exit code */
  354                         l_clock_t       _utime;
  355                         l_clock_t       _stime;
  356                 } _sigchld;
  357 
  358                 struct {
  359                         l_uintptr_t     _addr;  /* Faulting insn/memory ref. */
  360                 } _sigfault;
  361 
  362                 struct {
  363                         l_long          _band;  /* POLL_IN,POLL_OUT,POLL_MSG */
  364                         l_int           _fd;
  365                 } _sigpoll;
  366         } _sifields;
  367 } l_siginfo_t;
  368 
  369 #define lsi_pid         _sifields._kill._pid
  370 #define lsi_uid         _sifields._kill._uid
  371 #define lsi_tid         _sifields._timer._tid
  372 #define lsi_overrun     _sifields._timer._overrun
  373 #define lsi_sys_private _sifields._timer._sys_private
  374 #define lsi_status      _sifields._sigchld._status
  375 #define lsi_utime       _sifields._sigchld._utime
  376 #define lsi_stime       _sifields._sigchld._stime
  377 #define lsi_value       _sifields._rt._sigval
  378 #define lsi_int         _sifields._rt._sigval.sival_int
  379 #define lsi_ptr         _sifields._rt._sigval.sival_ptr
  380 #define lsi_addr        _sifields._sigfault._addr
  381 #define lsi_band        _sifields._sigpoll._band
  382 #define lsi_fd          _sifields._sigpoll._fd
  383 
  384 struct l_fpreg {
  385         u_int16_t       significand[4];
  386         u_int16_t       exponent;
  387 };
  388 
  389 struct l_fpxreg {
  390         u_int16_t       significand[4];
  391         u_int16_t       exponent;
  392         u_int16_t       padding[3];
  393 };
  394 
  395 struct l_xmmreg {
  396         u_int32_t       element[4];
  397 };
  398 
  399 struct l_fpstate {
  400         /* Regular FPU environment */
  401         u_int32_t               cw;
  402         u_int32_t               sw;
  403         u_int32_t               tag;
  404         u_int32_t               ipoff;
  405         u_int32_t               cssel;
  406         u_int32_t               dataoff;
  407         u_int32_t               datasel;
  408         struct l_fpreg          _st[8];
  409         u_int16_t               status;
  410         u_int16_t               magic;          /* 0xffff = regular FPU data */
  411 
  412         /* FXSR FPU environment */
  413         u_int32_t               _fxsr_env[6];   /* env is ignored. */
  414         u_int32_t               mxcsr;
  415         u_int32_t               reserved;
  416         struct l_fpxreg         _fxsr_st[8];    /* reg data is ignored. */
  417         struct l_xmmreg         _xmm[8];
  418         u_int32_t               padding[56];
  419 };
  420 
  421 /*
  422  * We make the stack look like Linux expects it when calling a signal
  423  * handler, but use the BSD way of calling the handler and sigreturn().
  424  * This means that we need to pass the pointer to the handler too.
  425  * It is appended to the frame to not interfere with the rest of it.
  426  */
  427 struct l_sigframe {
  428         l_int                   sf_sig;
  429         struct l_sigcontext     sf_sc;
  430         struct l_fpstate        sf_fpstate;
  431         l_uint                  sf_extramask[LINUX_NSIG_WORDS-1];
  432         l_handler_t             sf_handler;
  433 };
  434 
  435 struct l_rt_sigframe {
  436         l_int                   sf_sig;
  437         l_siginfo_t             *sf_siginfo;
  438         struct l_ucontext       *sf_ucontext;
  439         l_siginfo_t             sf_si;
  440         struct l_ucontext       sf_sc;
  441         l_handler_t             sf_handler;
  442 };
  443 
  444 extern struct sysentvec linux_sysvec;
  445 
  446 /*
  447  * arch specific open/fcntl flags
  448  */
  449 #define LINUX_F_GETLK64         12
  450 #define LINUX_F_SETLK64         13
  451 #define LINUX_F_SETLKW64        14
  452 
  453 union l_semun {
  454         l_int           val;
  455         struct l_semid_ds       *buf;
  456         l_ushort        *array;
  457         struct l_seminfo        *__buf;
  458         void            *__pad;
  459 };
  460 
  461 struct l_ipc_perm {
  462         l_key_t         key;
  463         l_uid16_t       uid;
  464         l_gid16_t       gid;
  465         l_uid16_t       cuid;
  466         l_gid16_t       cgid;
  467         l_ushort        mode;
  468         l_ushort        seq;
  469 };
  470 
  471 /*
  472  * Socket defines
  473  */
  474 #define LINUX_SOL_SOCKET        1
  475 #define LINUX_SOL_IP            0
  476 #define LINUX_SOL_IPX           256
  477 #define LINUX_SOL_AX25          257
  478 #define LINUX_SOL_TCP           6
  479 #define LINUX_SOL_UDP           17
  480 
  481 #define LINUX_SO_DEBUG          1
  482 #define LINUX_SO_REUSEADDR      2
  483 #define LINUX_SO_TYPE           3
  484 #define LINUX_SO_ERROR          4
  485 #define LINUX_SO_DONTROUTE      5
  486 #define LINUX_SO_BROADCAST      6
  487 #define LINUX_SO_SNDBUF         7
  488 #define LINUX_SO_RCVBUF         8
  489 #define LINUX_SO_KEEPALIVE      9
  490 #define LINUX_SO_OOBINLINE      10
  491 #define LINUX_SO_NO_CHECK       11
  492 #define LINUX_SO_PRIORITY       12
  493 #define LINUX_SO_LINGER         13
  494 #define LINUX_SO_PEERCRED       17
  495 #define LINUX_SO_RCVLOWAT       18
  496 #define LINUX_SO_SNDLOWAT       19
  497 #define LINUX_SO_RCVTIMEO       20
  498 #define LINUX_SO_SNDTIMEO       21
  499 #define LINUX_SO_TIMESTAMP      29
  500 #define LINUX_SO_ACCEPTCONN     30
  501 
  502 struct l_sockaddr {
  503         l_ushort        sa_family;
  504         char            sa_data[14];
  505 };
  506 
  507 struct l_ifmap {
  508         l_ulong         mem_start;
  509         l_ulong         mem_end;
  510         l_ushort        base_addr;
  511         u_char          irq;
  512         u_char          dma;
  513         u_char          port;
  514 };
  515 
  516 #define LINUX_IFHWADDRLEN       6
  517 #define LINUX_IFNAMSIZ          16
  518 
  519 struct l_ifreq {
  520         union {
  521                 char    ifrn_name[LINUX_IFNAMSIZ];
  522         } ifr_ifrn;
  523 
  524         union {
  525                 struct l_sockaddr       ifru_addr;
  526                 struct l_sockaddr       ifru_dstaddr;
  527                 struct l_sockaddr       ifru_broadaddr;
  528                 struct l_sockaddr       ifru_netmask;
  529                 struct l_sockaddr       ifru_hwaddr;
  530                 l_short         ifru_flags[1];
  531                 l_int           ifru_metric;
  532                 l_int           ifru_mtu;
  533                 struct l_ifmap  ifru_map;
  534                 char            ifru_slave[LINUX_IFNAMSIZ];
  535                 l_caddr_t       ifru_data;
  536         } ifr_ifru;
  537 };
  538 
  539 #define ifr_name        ifr_ifrn.ifrn_name      /* Interface name */
  540 #define ifr_hwaddr      ifr_ifru.ifru_hwaddr    /* MAC address */
  541 
  542 /*
  543  * poll()
  544  */
  545 #define LINUX_POLLIN            0x0001
  546 #define LINUX_POLLPRI           0x0002
  547 #define LINUX_POLLOUT           0x0004
  548 #define LINUX_POLLERR           0x0008
  549 #define LINUX_POLLHUP           0x0010
  550 #define LINUX_POLLNVAL          0x0020
  551 #define LINUX_POLLRDNORM        0x0040
  552 #define LINUX_POLLRDBAND        0x0080
  553 #define LINUX_POLLWRNORM        0x0100
  554 #define LINUX_POLLWRBAND        0x0200
  555 #define LINUX_POLLMSG           0x0400
  556 
  557 struct l_pollfd {
  558         l_int           fd;
  559         l_short         events;
  560         l_short         revents;
  561 };
  562 
  563 struct l_user_desc {
  564         l_uint          entry_number;
  565         l_uint          base_addr;
  566         l_uint          limit;
  567         l_uint          seg_32bit:1;
  568         l_uint          contents:2;
  569         l_uint          read_exec_only:1;
  570         l_uint          limit_in_pages:1;
  571         l_uint          seg_not_present:1;
  572         l_uint          useable:1;
  573 };
  574 
  575 struct l_desc_struct {
  576         unsigned long   a, b;
  577 };
  578 
  579 
  580 #define LINUX_LOWERWORD 0x0000ffff
  581 
  582 /*
  583  * Macros which does the same thing as those in Linux include/asm-um/ldt-i386.h.
  584  * These convert Linux user space descriptor to machine one.
  585  */
  586 #define LINUX_LDT_entry_a(info)                                 \
  587         ((((info)->base_addr & LINUX_LOWERWORD) << 16) |        \
  588         ((info)->limit & LINUX_LOWERWORD))
  589 
  590 #define LINUX_ENTRY_B_READ_EXEC_ONLY    9
  591 #define LINUX_ENTRY_B_CONTENTS          10
  592 #define LINUX_ENTRY_B_SEG_NOT_PRESENT   15
  593 #define LINUX_ENTRY_B_BASE_ADDR         16
  594 #define LINUX_ENTRY_B_USEABLE           20
  595 #define LINUX_ENTRY_B_SEG32BIT          22
  596 #define LINUX_ENTRY_B_LIMIT             23
  597 
  598 #define LINUX_LDT_entry_b(info)                                                 \
  599         (((info)->base_addr & 0xff000000) |                                     \
  600         ((info)->limit & 0xf0000) |                                             \
  601         ((info)->contents << LINUX_ENTRY_B_CONTENTS) |                          \
  602         (((info)->seg_not_present == 0) << LINUX_ENTRY_B_SEG_NOT_PRESENT) |     \
  603         (((info)->base_addr & 0x00ff0000) >> LINUX_ENTRY_B_BASE_ADDR) |         \
  604         (((info)->read_exec_only == 0) << LINUX_ENTRY_B_READ_EXEC_ONLY) |       \
  605         ((info)->seg_32bit << LINUX_ENTRY_B_SEG32BIT) |                         \
  606         ((info)->useable << LINUX_ENTRY_B_USEABLE) |                            \
  607         ((info)->limit_in_pages << LINUX_ENTRY_B_LIMIT) | 0x7000)
  608 
  609 #define LINUX_LDT_empty(info)           \
  610         ((info)->base_addr == 0 &&      \
  611         (info)->limit == 0 &&           \
  612         (info)->contents == 0 &&        \
  613         (info)->seg_not_present == 1 && \
  614         (info)->read_exec_only == 1 &&  \
  615         (info)->seg_32bit == 0 &&       \
  616         (info)->limit_in_pages == 0 &&  \
  617         (info)->useable == 0)
  618 
  619 /*
  620  * Macros for converting segments.
  621  * They do the same as those in arch/i386/kernel/process.c in Linux.
  622  */
  623 #define LINUX_GET_BASE(desc)                            \
  624         ((((desc)->a >> 16) & LINUX_LOWERWORD) |        \
  625         (((desc)->b << 16) & 0x00ff0000) |              \
  626         ((desc)->b & 0xff000000))
  627 
  628 #define LINUX_GET_LIMIT(desc)                   \
  629         (((desc)->a & LINUX_LOWERWORD) |        \
  630         ((desc)->b & 0xf0000))
  631 
  632 #define LINUX_GET_32BIT(desc)           \
  633         (((desc)->b >> LINUX_ENTRY_B_SEG32BIT) & 1)
  634 #define LINUX_GET_CONTENTS(desc)        \
  635         (((desc)->b >> LINUX_ENTRY_B_CONTENTS) & 3)
  636 #define LINUX_GET_WRITABLE(desc)        \
  637         (((desc)->b >> LINUX_ENTRY_B_READ_EXEC_ONLY) & 1)
  638 #define LINUX_GET_LIMIT_PAGES(desc)     \
  639         (((desc)->b >> LINUX_ENTRY_B_LIMIT) & 1)
  640 #define LINUX_GET_PRESENT(desc)         \
  641         (((desc)->b >> LINUX_ENTRY_B_SEG_NOT_PRESENT) & 1)
  642 #define LINUX_GET_USEABLE(desc)         \
  643         (((desc)->b >> LINUX_ENTRY_B_USEABLE) & 1)
  644 
  645 #define linux_copyout_rusage(r, u)      copyout(r, u, sizeof(*r))
  646 
  647 /* robust futexes */
  648 struct linux_robust_list {
  649         struct linux_robust_list        *next;
  650 };
  651 
  652 struct linux_robust_list_head {
  653         struct linux_robust_list        list;
  654         l_long                          futex_offset;
  655         struct linux_robust_list        *pending_list;
  656 };
  657 
  658 #endif /* !_I386_LINUX_H_ */

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