com32/lib/syslinux/ipappend.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2008 H. Peter Anvin - All Rights Reserved
   4  *
   5  *   Permission is hereby granted, free of charge, to any person
   6  *   obtaining a copy of this software and associated documentation
   7  *   files (the "Software"), to deal in the Software without
   8  *   restriction, including without limitation the rights to use,
   9  *   copy, modify, merge, publish, distribute, sublicense, and/or
  10  *   sell copies of the Software, and to permit persons to whom
  11  *   the Software is furnished to do so, subject to the following
  12  *   conditions:
  13  *
  14  *   The above copyright notice and this permission notice shall
  15  *   be included in all copies or substantial portions of the Software.
  16  *
  17  *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18  *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  19  *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  20  *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  21  *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  22  *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23  *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  *   OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * ----------------------------------------------------------------------- */
  27
  28 /*
  29  * syslinux/ipappend.c
  30  *
  31  * Get ipappend strings
  32  */
  33
  34 #include <syslinux/config.h>
  35 #include <klibc/compiler.h>
  36 #include <com32.h>
  37
  38 struct syslinux_ipappend_strings __syslinux_ipappend_strings;
  39 static const char *syslinux_ipappend_string_list[32];
  40
  41 void __constructor __syslinux_get_ipappend_strings(void)
  42 {
  43   static com32sys_t reg;
  44   int i;
  45
  46   reg.eax.w[0] = 0x000f;
  47   __intcall(0x22, &reg, &reg);
  48
  49   if (!(reg.eflags.l & EFLAGS_CF)) {
  50     __syslinux_ipappend_strings.count = reg.ecx.w[0];
  51     __syslinux_ipappend_strings.ptr =
  52       syslinux_ipappend_string_list;
  53     for (i = 0; i < reg.ecx.w[0]; i++) {
  54       syslinux_ipappend_string_list[i] =
  55         MK_PTR(reg.es, *(uint16_t *)MK_PTR(reg.es, reg.ebx.w[0]+i*2));
  56     }
  57   }
  58 }