/*      $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