lib/libcaps/i386/md_globaldata.c

   1 /*
   2  * Copyright (c) 2003 Matthew Dillon <dillon@backplane.com>
   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  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $DragonFly: src/lib/libcaps/i386/md_globaldata.c,v 1.2 2003/12/07 04:21:54 dillon Exp $
  27  */
  28 #include "../defs.h"
  29 #include <machine/segments.h>
  30 #include <machine/sysarch.h>
  31
  32 int __mycpu__dummy;     /* for the MP lock functions */
  33
  34 void
  35 md_gdinit1(globaldata_t gd)
  36 {
  37     union descriptor desc;
  38     int error;
  39
  40     bzero(&desc, sizeof(desc));
  41     desc.sd.sd_lolimit = sizeof(struct globaldata);
  42     desc.sd.sd_lobase = (uintptr_t)gd & 0xFFFFFF;
  43     desc.sd.sd_hibase = (uintptr_t)gd >> 24;
  44     desc.sd.sd_type = SDT_MEMRW;
  45     desc.sd.sd_dpl = SEL_UPL;
  46     desc.sd.sd_p = 1;
  47     desc.sd.sd_hilimit = 0;
  48     desc.sd.sd_xx = 0;
  49     desc.sd.sd_def32 = 1;
  50     desc.sd.sd_gran = 0;
  51
  52     error = i386_set_ldt(gd->gd_cpuid, &desc, 1);
  53     if (error < 0)
  54         panic("i386_set_ldt cpu %d failed\n", gd->gd_cpuid);
  55 }
  56
  57 void
  58 md_gdinit2(globaldata_t gd)
  59 {
  60     _set_mycpu(LSEL(gd->gd_cpuid, SEL_UPL));
  61 }
  62