source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Registers.asm @ 596

Last change on this file since 596 was 596, checked in by krille_n_, 6 years ago

Changes:

  • Made changes to HotkeyBar.asm to give the Boot Menu and Hotkey Bar a more consistent look. It will probably seem a bit strange at first to people used to the classic theme.
  • Added the missing parts of USE_NEC_V that should have been committed with the rest in r593.
  • Removed DEFINES_ALL_FEATURES from the BIOS makefile. It didn't work anymore and never really made sense anyway. Added all the official builds to 'make unused' instead which actually uncovered some unused code in the Tiny build.
  • XTIDECFG will no longer load color themes from unrecognized versions of the BIOS.
  • Other fixes in comments and some minor optimizations.
File size: 3.3 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%ifdef EXCLUDE_FROM_XUB
24    %ifndef MODULE_EBIOS
25        %define EXCLUDE
26    %endif
27%endif
28;--------------------------------------------------------------------
29; Registers_ExchangeDSSIwithESDI
30;   Parameters
31;       Nothing
32;   Returns:
33;       DS:SI and ES:DI are exchanged.
34;   Corrupts registers:
35;       Nothing
36;--------------------------------------------------------------------
37%ifndef EXCLUDE
38ALIGN JUMP_ALIGN
39Registers_ExchangeDSSIwithESDI:
40    push    ds
41    push    es
42    pop     ds
43    pop     es
44    xchg    si, di
45    ret
46%endif
47%undef EXCLUDE
48
49
50;--------------------------------------------------------------------
51; Registers_CopySSBPtoESDI
52; Registers_CopySSBPtoDSSI
53; Registers_CopyDSSItoESDI
54; Registers_CopyESDItoDSSI
55;   Parameters
56;       Nothing
57;   Returns:
58;       Copies far pointer to different segment/pointer register pair
59;   Corrupts registers:
60;       Nothing
61;--------------------------------------------------------------------
62%ifdef INCLUDE_MENU_LIBRARY
63ALIGN JUMP_ALIGN
64Registers_CopySSBPtoESDI:
65    COPY_SSBP_TO_ESDI
66    ret
67%endif
68
69%ifndef EXCLUDE_FROM_XUB
70ALIGN JUMP_ALIGN
71Registers_CopySSBPtoDSSI:
72    COPY_SSBP_TO_DSSI
73    ret
74
75ALIGN JUMP_ALIGN
76Registers_CopyDSSItoESDI:
77    COPY_DSSI_TO_ESDI
78    ret
79
80ALIGN JUMP_ALIGN
81Registers_CopyESDItoDSSI:
82    COPY_ESDI_to_DSSI
83    ret
84%endif
85
86
87;--------------------------------------------------------------------
88; Registers_NormalizeESSI
89; Registers_NormalizeESDI
90;   Parameters
91;       DS:SI or ES:DI: Ptr to normalize
92;   Returns:
93;       DS:SI or ES:DI: Normalized pointer
94;   Corrupts registers:
95;       AX, CX
96;
97; Inline of NORMALIZE_FAR_POINTER so that we can share the last 2/3 of the
98; routine with Registers_NormalizeFinish.
99;
100;--------------------------------------------------------------------
101%ifndef EXCLUDE_FROM_XUB OR EXCLUDE_FROM_XTIDECFG
102ALIGN JUMP_ALIGN
103Registers_NormalizeESSI:
104    mov         cx, si
105    and         si, BYTE 0Fh
106    jmp         SHORT Registers_NormalizeFinish
107
108ALIGN JUMP_ALIGN
109Registers_NormalizeESDI:
110    mov         cx, di
111    and         di, BYTE 0Fh
112;;; fall-through
113
114ALIGN JUMP_ALIGN
115Registers_NormalizeFinish:
116    eSHR_IM     cx, 4
117    mov         ax, es
118    add         ax, cx
119    mov         es, ax
120    ret
121%endif
122
123
124;--------------------------------------------------------------------
125; Registers_SetZFifNullPointerInDSSI (commented to save bytes)
126;   Parameters
127;       DS:SI:  Far pointer
128;   Returns:
129;       ZF:     Set if NULL pointer in DS:SI
130;   Corrupts registers:
131;       Nothing
132;--------------------------------------------------------------------
133;ALIGN JUMP_ALIGN
134;Registers_SetZFifNullPointerInDSSI:
135;   push    ax
136;   mov     ax, ds
137;   or      ax, si
138;   pop     ax
139;   ret
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