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root/arch/x86/boot/mca.c

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DEFINITIONS

This source file includes following definitions.
  1. query_mca

/* -*- 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.
 *
 * ----------------------------------------------------------------------- */

/*
 * 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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