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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 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 1.1 (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: /*
26: * Copyright 1993 NeXT Computer, Inc.
27: * All rights reserved.
28: *
29: * Harness for calling protected-mode BIOS functions.
30: */
31:
32: #import <machdep/i386/asm.h>
33: #import <assym.h>
34:
35: #define data32 .byte 0x66
36: #define addr32 .byte 0x67
37:
38: #define O_INT 0
39: #define O_EAX 4
40: #define O_EBX 8
41: #define O_ECX 12
42: #define O_EDX 16
43: #define O_EDI 20
44: #define O_ESI 24
45: #define O_EBP 28
46: #define O_CS 32
47: #define O_DS 34
48: #define O_ES 36
49: #define O_FLG 40
50: #define O_ADDR 44
51:
52: .data
53: .align 2
54: save_es:
55: .long 0
56: save_eax:
57: .long 0
58: save_edx:
59: .long 0
60: save_flag:
61: .long 0
62: new_eax:
63: .long 0
64: new_edx:
65: .long 0
66:
67: .text
68: ENTRY(_bios32)
69: enter $0,$0
70: pushal
71: push %es
72: push %fs
73: push %gs
74: pushf
75:
76: movl 8(%ebp), %edx // address of save area
77:
78: movw O_CS(%edx), %ax
79: movw %ax, save_seg
80: movl O_ADDR(%edx), %eax
81: movl %eax, save_addr
82: movl O_EBX(%edx), %ebx
83: movl O_ECX(%edx), %ecx
84: movl O_EDI(%edx), %edi
85: movl O_ESI(%edx), %esi
86: movl O_EBP(%edx), %ebp
87: movl %edx, save_edx
88: movl O_EAX(%edx), %eax
89: movl %eax, new_eax
90: movl O_EDX(%edx), %eax
91: movl %eax, new_edx
92: movw O_DS(%edx), %ax
93: pushw %ax
94:
95: movl new_eax, %eax
96: mov new_edx, %edx
97: popw %ds
98:
99: cli
100: .byte 0x9A // far jmp
101: save_addr:
102: .long 0
103: save_seg:
104: .word 0
105:
106: pushf
107: mov $KDSSEL, %eax
108: mov %ax, %ds
109:
110:
111: movl %eax, save_eax
112: popl %eax
113: movw %ax, save_flag
114: movw %es, %ax
115: movw %ax, save_es
116:
117: movl %edx, new_edx // save new edx before clobbering
118: movl save_edx, %edx
119: movl new_edx, %eax // now move it into buffer
120: movl %eax, O_EDX(%edx)
121: movl save_eax, %eax
122: movl %eax, O_EAX(%edx)
123: movw save_es, %ax
124: movw %ax, O_ES(%edx)
125: movw save_flag, %ax
126: movw %ax, O_FLG(%edx)
127: movl %ebx, O_EBX(%edx)
128: movl %ecx, O_ECX(%edx)
129: movl %edi, O_EDI(%edx)
130: movl %esi, O_ESI(%edx)
131: movl %ebp, O_EBP(%edx)
132:
133: popf
134: pop %gs
135: pop %fs
136: pop %es
137:
138: popal
139: leave
140:
141: ret
142:
143:
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