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mca.c

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * arch/i386/boot/mca.c
 *
 * Get the MCA system description table
 */

#include "boot.h"

int query_mca(void)
{
      u8 err;
      u16 es, bx, len;

      asm("pushw %%es ; "
          "int $0x15 ; "
          "setc %0 ; "
          "movw %%es, %1 ; "
          "popw %%es"
          : "=acd" (err), "=acdSD" (es), "=b" (bx)
          : "a" (0xc000));

      if (err)
            return -1;  /* No MCA present */

      set_fs(es);
      len = rdfs16(bx);

      if (len > sizeof(boot_params.sys_desc_table))
            len = sizeof(boot_params.sys_desc_table);

      copy_from_fs(&boot_params.sys_desc_table, bx, len);
      return 0;
}

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