Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/* -*- 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;

}