source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Memory.asm@ 622

Last change on this file since 622 was 621, checked in by Krister Nordvall, 3 years ago

Changes:

  • Fixed three different bugs all causing the boot menu to show drives using IRQs even though the BIOS had been built without MODULE_IRQ.
  • Fixed two bugs in XTIDECFG where loading a BIOS from file and then loading the old settings from EEPROM would
    • overwrite ROMVARS.wFlags in the loaded BIOS file (in RAM). The possibly resulting mismatch of module flags could make it impossible to change settings for modules included in the BIOS or allow changing settings for modules not included in the BIOS.
    • not copy the color theme over to the loaded BIOS.
  • Also fixed two very minor bugs in XTIDECFG in BiosFile_LoadFileFromDSSItoRamBuffer and BiosFile_SaveRamBufferToFileInDSSI where the error handling in these routines would close whatever file handle that happened to match the error code returned by DOS in AX.
  • Made significant changes to the new flash ROM programming routines to reduce the size. Also fixed a minor bug that would cause the second verification to be skipped and return success when programming a 64 KB block of data.
  • Changed the custom BIOS build file names to the 8.3 format.
  • Changed some help strings in XTIDECFG to clarify things.
  • Other minor optimizations and fixes.
File size: 4.5 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for memory access.
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; OPTIMIZE_STRING_OPERATION
25; Parameters
26; %1: String instruction without size (only MOVS and STOS is supported)
27; CX: Number of BYTEs to operate
28; DS:SI: Ptr to source data (for MOVS)
29; ES:DI: Ptr to destination
30; Returns:
31; CF: Cleared
32; CX: Zero
33; SI, DI: Updated by number of bytes operated
34; Corrupts registers:
35; Nothing
36;--------------------------------------------------------------------
37%macro OPTIMIZE_STRING_OPERATION 1
38 shr cx, 1
39 rep %1w
40 eRCL_IM cx, 1
41 rep %1b
42%endmacro
43
44
45;--------------------------------------------------------------------
46; Memory_CopyCXbytesFromDSSItoESDI
47; Parameters
48; CX: Number of bytes to copy
49; DS:SI: Ptr to source data
50; ES:DI: Ptr to destination buffer
51; Returns:
52; CF: Cleared
53; SI, DI: Updated by number of bytes copied
54; Corrupts registers:
55; Nothing
56;--------------------------------------------------------------------
57%ifndef EXCLUDE_FROM_XUB
58ALIGN JUMP_ALIGN
59Memory_CopyCXbytesFromDSSItoESDI:
60 push cx
61 OPTIMIZE_STRING_OPERATION movs
62 pop cx
63 ret
64%endif
65
66
67;--------------------------------------------------------------------
68; Memory_ZeroSSBPwithSizeInCX
69; Parameters
70; CX: Number of bytes to zero
71; SS:BP: Ptr to buffer to zero
72; Returns:
73; Nothing
74; Corrupts registers:
75; CX
76;--------------------------------------------------------------------
77%ifdef INCLUDE_MENU_LIBRARY
78ALIGN JUMP_ALIGN
79Memory_ZeroSSBPwithSizeInCX:
80 push es
81 push di
82 push ax
83 call Registers_CopySSBPtoESDI
84 call Memory_ZeroESDIwithSizeInCX
85 pop ax
86 pop di
87 pop es
88 ret
89%endif
90
91
92;--------------------------------------------------------------------
93; Memory_ZeroESDIwithSizeInCX
94; Parameters
95; CX: Number of bytes to zero
96; ES:DI: Ptr to destination buffer
97; Returns:
98; DI: Updated by number of BYTEs stored
99; Corrupts registers:
100; AX, CX
101;--------------------------------------------------------------------
102ALIGN JUMP_ALIGN
103Memory_ZeroESDIwithSizeInCX:
104 xor ax, ax
105 ; Fall to Memory_StoreCXbytesFromAccumToESDI
106
107;--------------------------------------------------------------------
108; Memory_StoreCXbytesFromAccumToESDI
109; Parameters
110; AX: Word to use to fill buffer
111; CX: Number of BYTEs to store
112; ES:DI: Ptr to destination buffer
113; Returns:
114; DI: Updated by number of BYTEs stored
115; Corrupts registers:
116; CX
117;--------------------------------------------------------------------
118Memory_StoreCXbytesFromAccumToESDI:
119 OPTIMIZE_STRING_OPERATION stos
120 ret
121
122
123;--------------------------------------------------------------------
124; Memory_ReserveCLbytesFromStackToDSSI
125; Memory_ReserveCXbytesFromStackToDSSI
126; Parameters
127; CL/CX: Number of bytes to reserve
128; Returns:
129; DS:SI: Ptr to reserved buffer
130; Corrupts registers:
131; AX
132;--------------------------------------------------------------------
133%ifndef EXCLUDE_FROM_XUB
134ALIGN JUMP_ALIGN
135Memory_ReserveCLbytesFromStackToDSSI:
136 xor ch, ch
137Memory_ReserveCXbytesFromStackToDSSI:
138 pop ax
139 push ss
140 pop ds
141 sub sp, cx
142 mov si, sp
143 jmp ax
144%endif
145
146
147;--------------------------------------------------------------------
148; Memory_SumCXbytesFromESSItoAL
149; Parameters
150; CX: Number of bytes to sum (0=65536)
151; ES:SI: Ptr to buffer containing the bytes to sum
152; Returns:
153; AL: Sum of bytes
154; ZF: Set if result is zero
155; Cleared if result is non-zero
156; Corrupts registers:
157; CX
158;--------------------------------------------------------------------
159%ifndef EXCLUDE_FROM_XTIDECFG OR NO_ATAID_VALIDATION
160ALIGN JUMP_ALIGN
161Memory_SumCXbytesFromESSItoAL:
162 add si, cx
163 xor al, al
164ALIGN JUMP_ALIGN
165.AddNextByteToAL:
166 dec si
167 add al, [es:si]
168 loop .AddNextByteToAL
169 ret
170%endif
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