com32/lib/syslinux/pxe_get_nic.c

   1 /* ----------------------------------------------------------------------- *
   2  *
   3  *   Copyright 2007-2008 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  * pxe_get_cached.c
  30  *
  31  * PXE call "get cached info"
  32  */
  33
  34 #include <stdlib.h>
  35 #include <stdint.h>
  36 #include <string.h>
  37 #include <com32.h>
  38
  39 #include <syslinux/pxe.h>
  40
  41 /* Returns the status code from PXE (0 on success),
  42    or -1 on invocation failure */
  43 int pxe_get_nic_type(t_PXENV_UNDI_GET_NIC_TYPE *gnt)
  44 {
  45     com32sys_t regs;
  46     t_PXENV_UNDI_GET_NIC_TYPE *lgnt;
  47
  48     lgnt = lzalloc(sizeof *lgnt);
  49     if (!lgnt)
  50         return -1;
  51
  52     memset(&regs, 0, sizeof regs);
  53     regs.eax.w[0] = 0x0009;
  54     regs.ebx.w[0] = PXENV_UNDI_GET_NIC_TYPE;
  55     regs.es = SEG(lgnt);
  56     /* regs.edi.w[0] = OFFS(lgnt); */
  57
  58     __intcall(0x22, &regs, &regs);
  59
  60     memcpy(gnt, lgnt, sizeof(t_PXENV_UNDI_GET_NIC_TYPE));
  61     lfree(lgnt);
  62
  63     if (regs.eflags.l & EFLAGS_CF)
  64         return -1;
  65
  66     return gnt->Status;
  67 }