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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights
	7	* Reserved. This file contains Original Code and/or Modifications of
	8	* Original Code as defined in and that are subject to the Apple Public
	9	* Source License Version 2.0 (the "License"). You may not use this file
	10	* except in compliance with the License. Please obtain a copy of the
	11	* License at http://www.apple.com/publicsource and read it before using
	12	* this file.
	13	*
	14	* The Original Code and all software distributed under the License are
	15	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	16	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	17	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the
	19	* License for the specific language governing rights and limitations
	20	* under the License.
	21	*
	22	* @APPLE_LICENSE_HEADER_END@
	23	*/
	24	/*
	25	* Copyright 1993 NeXT Computer, Inc.
	26	* All rights reserved.
	27	*
	28	* Harness for calling real-mode BIOS functions.
	29	*/
	30
	31	#include <architecture/i386/asm_help.h>
	32	#include "memory.h"
	33
	34	#define data32 .byte 0x66
	35	#define addr32 .byte 0x67
	36
	37	#define O_INT 0
	38	#define O_EAX 4
	39	#define O_EBX 8
	40	#define O_ECX 12
	41	#define O_EDX 16
	42	#define O_EDI 20
	43	#define O_ESI 24
	44	#define O_EBP 28
	45	#define O_CS 32
	46	#define O_DS 34
	47	#define O_ES 36
	48	#define O_FLG 38
	49
	50	.data
	51	.lcomm save_eax, 4,2
	52	.lcomm save_edx, 4,2
	53	.lcomm save_es, 2,1
	54	.lcomm save_flag, 2,1
	55	.lcomm new_eax, 4,2
	56	.lcomm new_edx, 4,2
	57	.lcomm new_es, 2,1
	58
	59	.text
	60
	61	/*============================================================================
	62	* Call real-mode BIOS INT functions.
	63	*
	64	*/
	65	LABEL(_bios)
	66	enter $0, $0
	67	pushal
	68
	69	movl 8(%ebp), %edx // address of save area
	70	movb O_INT(%edx), %al // save int number
	71	movb %al, do_int+1
	72
	73	movl O_EBX(%edx), %ebx
	74	movl O_ECX(%edx), %ecx
	75	movl O_EDI(%edx), %edi
	76	movl O_ESI(%edx), %esi
	77	movl O_EBP(%edx), %ebp
	78	movl %edx, save_edx
	79	movl O_EAX(%edx), %eax
	80	movl %eax, new_eax
	81	movl O_EDX(%edx), %eax
	82	movl %eax, new_edx
	83	movw O_ES(%edx), %ax
	84	movl %ax, new_es
	85
	86	call __prot_to_real
	87
	88	data32
	89	addr32
	90	mov OFFSET1U16(new_eax), %eax
	91	data32
	92	addr32
	93	mov OFFSET1U16(new_edx), %edx
	94	data32
	95	addr32
	96	mov OFFSET1U16(new_es), %es
	97
	98	do_int:
	99	int $0x00
	100	pushf
	101	data32
	102	addr32
	103	movl %eax, OFFSET1U16(save_eax)
	104	popl %eax // actually pop %ax
	105	addr32
	106	movl %eax, OFFSET1U16(save_flag) // actually movw
	107	mov %es, %ax
	108	addr32
	109	movl %eax, OFFSET1U16(save_es) // actually movw
	110	data32
	111	call __real_to_prot
	112
	113	movl %edx, new_edx // save new edx before clobbering
	114	movl save_edx, %edx
	115	movl new_edx, %eax // now move it into buffer
	116	movl %eax, O_EDX(%edx)
	117	movl save_eax, %eax
	118	movl %eax, O_EAX(%edx)
	119	movw save_es, %ax
	120	movw %ax, O_ES(%edx)
	121	movw save_flag, %ax
	122	movw %ax, O_FLG(%edx)
	123	movl %ebx, O_EBX(%edx)
	124	movl %ecx, O_ECX(%edx)
	125	movl %edi, O_EDI(%edx)
	126	movl %esi, O_ESI(%edx)
	127	movl %ebp, O_EBP(%edx)
	128
	129	popal
	130	leave
	131
	132	ret
	133