source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Registers.asm@ 537

Last change on this file since 537 was 526, checked in by krille_n_@…, 12 years ago

Changes:

  • Update of the copyright notices to include the year 2013.
File size: 3.2 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for register operations.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
24; Registers_ExchangeDSSIwithESDI
25; Parameters
26; Nothing
27; Returns:
28; DS:SI and ES:DI are exchanged.
29; Corrupts registers:
30; Nothing
31;--------------------------------------------------------------------
32ALIGN JUMP_ALIGN
33Registers_ExchangeDSSIwithESDI:
34 push ds
35 push es
36 pop ds
37 pop es
38 xchg si, di
39 ret
40
41
42;--------------------------------------------------------------------
43; Registers_CopySSBPtoESDI
44; Registers_CopySSBPtoDSSI
45; Registers_CopyDSSItoESDI
46; Registers_CopyESDItoDSSI
47; Parameters
48; Nothing
49; Returns:
50; Copies farm pointer to different segment/pointer register pair
51; Corrupts registers:
52; Nothing
53;--------------------------------------------------------------------
54%ifdef INCLUDE_MENU_LIBRARY
55ALIGN JUMP_ALIGN
56Registers_CopySSBPtoESDI:
57 COPY_SSBP_TO_ESDI
58 ret
59%endif
60
61%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
62ALIGN JUMP_ALIGN
63Registers_CopySSBPtoDSSI:
64 COPY_SSBP_TO_DSSI
65 ret
66
67ALIGN JUMP_ALIGN
68Registers_CopyDSSItoESDI:
69 COPY_DSSI_TO_ESDI
70 ret
71
72ALIGN JUMP_ALIGN
73Registers_CopyESDItoDSSI:
74 COPY_ESDI_to_DSSI
75 ret
76%endif
77
78
79;--------------------------------------------------------------------
80; Registers_NormalizeESSI
81; Registers_NormalizeESDI
82; Parameters
83; DS:SI or ES:DI: Ptr to normalize
84; Returns:
85; DS:SI or ES:DI: Normalized pointer
86; Corrupts registers:
87; AX, CX
88;
89; Inline of NORMALIZE_FAR_POINTER so that we can share the last 2/3 of the
90; routine with Registers_NormalizeFinish.
91;
92;--------------------------------------------------------------------
93%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
94ALIGN JUMP_ALIGN
95Registers_NormalizeESSI:
96 mov cx, si
97 and si, byte 0fh
98 jmp Registers_NormalizeFinish
99
100ALIGN JUMP_ALIGN
101Registers_NormalizeESDI:
102 mov cx, di
103 and di, byte 0fh
104;;; fall-through
105
106ALIGN JUMP_ALIGN
107Registers_NormalizeFinish:
108 eSHR_IM cx, 4
109 mov ax, es
110 add ax, cx
111 mov es, ax
112 ret
113%endif
114
115
116;--------------------------------------------------------------------
117; Registers_SetZFifNullPointerInDSSI (commented to save bytes)
118; Parameters
119; DS:SI: Far pointer
120; Returns:
121; ZF: Set if NULL pointer in DS:SI
122; Corrupts registers:
123; Nothing
124;--------------------------------------------------------------------
125;ALIGN JUMP_ALIGN
126;Registers_SetZFifNullPointerInDSSI:
127; push ax
128; mov ax, ds
129; or ax, si
130; pop ax
131; ret
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