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pxe_call.S revision 1.2 
      1 /*	$NetBSD: pxe_call.S,v 1.2 2002/03/27 17:24:22 kanaoka Exp $	*/
      2 
      3 /*
      4  * Copyright 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Low level PXE BIOS call glue.
     40  */
     41 
     42 #include <machine/asm.h>
     43 
     44 #define	addr32	.byte 0x67
     45 #define	data32	.byte 0x66
     46 #define	farcall	.byte 0x9a
     47 
     48 ENTRY(pxecall_bangpxe)
     49 	pushl	%ebp
     50 	movl	%esp, %ebp
     51 	pushl	%ebx
     52 	pushl	%ecx
     53 	pushl	%edx
     54 
     55 	/* For simplicity, just move all 32 bits. */
     56 	movl	8(%ebp), %ebx
     57 
     58 	pushw	_C_LABEL(pxe_command_buf_seg)
     59 	pushw	_C_LABEL(pxe_command_buf_off)
     60 	pushw	%bx
     61 
     62 	call	_C_LABEL(prot_to_real)		# enter real mode
     63 
     64 	/* The encoding is: 0x9a offlo offhi seglo seghi */
     65 	farcall
     66 	.globl	_C_LABEL(bangpxe_off)
     67 _C_LABEL(bangpxe_off):
     68 	.word	0
     69 	.globl	_C_LABEL(bangpxe_seg)
     70 _C_LABEL(bangpxe_seg):
     71 	.word	0
     72 
     73 	data32
     74 	call	_C_LABEL(real_to_prot)		# leave real mode
     75 
     76 	add	$6, %esp
     77 
     78 	popl	%edx
     79 	popl	%ecx
     80 	popl	%ebx
     81 	popl	%ebp
     82 	ret
     83 
     84 ENTRY(pxecall_pxenv)
     85 	pushl	%ebp
     86 	movl	%esp, %ebp
     87 	pushl	%ebx
     88 	pushl	%ecx
     89 	pushl	%edx
     90 	pushl	%edi
     91 
     92 	/* For simplicity, just move all 32 bits. */
     93 	movl	8(%ebp), %ebx
     94 
     95 	call	_C_LABEL(prot_to_real)		# enter real mode
     96 
     97 	/* prot_to_real() has already set %es to BOOTSEG */
     98 	addr32
     99 	leal	_C_LABEL(pxe_command_buf), %edi
    100 
    101 	/* The encoding is: 0x9a offlo offhi seglo seghi */
    102 	farcall
    103 	.globl	_C_LABEL(pxenv_off)
    104 _C_LABEL(pxenv_off):
    105 	.word	0
    106 	.globl	_C_LABEL(pxenv_seg)
    107 _C_LABEL(pxenv_seg):
    108 	.word	0
    109 
    110 	data32
    111 	call	_C_LABEL(real_to_prot)		# leave real mode
    112 
    113 	popl	%edi
    114 	popl	%edx
    115 	popl	%ecx
    116 	popl	%ebx
    117 	popl	%ebp
    118 	ret
    119