/*      $NetBSD: pxe_call.S,v 1.5 2013/10/20 19:47:28 christos Exp $    */

/*
 * Copyright 2001 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Low level PXE BIOS call glue.
 */

#include <machine/asm.h>

ENTRY(pxecall_bangpxe)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ebx
        pushl   %ecx
        pushl   %edx

        /* For simplicity, just move all 32 bits. */
        movl    8(%ebp), %ebx

        pushw   _C_LABEL(pxe_command_buf_seg)
        pushw   _C_LABEL(pxe_command_buf_off)
        pushw   %bx

        call    _C_LABEL(prot_to_real)          # enter real mode
        .code16

        /* The encoding is: 0x9a offlo offhi seglo seghi */
        lcall   $0, $0xffff
        .globl  _C_LABEL(bangpxe_off)
_C_LABEL(bangpxe_off) = . - 4
        .globl  _C_LABEL(bangpxe_seg)
_C_LABEL(bangpxe_seg) = . - 2

        calll   _C_LABEL(real_to_prot)          # leave real mode
        .code32

        add     $6, %esp

        popl    %edx
        popl    %ecx
        popl    %ebx
        popl    %ebp
        ret

ENTRY(pxecall_pxenv)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ebx
        pushl   %ecx
        pushl   %edx
        pushl   %edi

        /* For simplicity, just move all 32 bits. */
        movl    8(%ebp), %ebx

        call    _C_LABEL(prot_to_real)          # enter real mode
        .code16

        /* prot_to_real() has already set %es to BOOTSEG */
        lea     _C_LABEL(pxe_command_buf), %di

        /* The encoding is: 0x9a offlo offhi seglo seghi */
        lcall   $0, $0xffff
        .globl  _C_LABEL(pxenv_off)
_C_LABEL(pxenv_off) = . - 4
        .globl  _C_LABEL(pxenv_seg)
_C_LABEL(pxenv_seg) = . - 2

        calll   _C_LABEL(real_to_prot)          # leave real mode
        .code32

        popl    %edi
        popl    %edx
        popl    %ecx
        popl    %ebx
        popl    %ebp
        ret

        .globl _C_LABEL(pxe_command_buf)
        .align 32
        .type   _C_LABEL(pxe_command_buf), @object
        .size   _C_LABEL(pxe_command_buf), 256
_C_LABEL(pxe_command_buf):
        .zero   256