source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Memory.asm @ 621

Last change on this file since 621 was 621, checked in by krille_n_, 2 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
RevLine 
[41]1; Project name  :   Assembly Library
2; Description   :   Functions for memory access.
3
[376]4;
[445]5; XTIDE Universal BIOS and Associated Tools
[526]6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[376]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.
[445]12;
[376]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
[445]16; GNU General Public License for more details.
[376]17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[445]18;
[376]19
[41]20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
[46]24; OPTIMIZE_STRING_OPERATION
[41]25;   Parameters
[592]26;       %1:     String instruction without size (only MOVS and STOS is supported)
[46]27;       CX:     Number of BYTEs to operate
[592]28;       DS:SI:  Ptr to source data (for MOVS)
[46]29;       ES:DI:  Ptr to destination
[41]30;   Returns:
[592]31;       CF:     Cleared
32;       CX:     Zero
[46]33;       SI, DI: Updated by number of bytes operated
34;   Corrupts registers:
[41]35;       Nothing
[46]36;--------------------------------------------------------------------
[592]37%macro OPTIMIZE_STRING_OPERATION 1
38    shr     cx, 1
39    rep     %1w
40    eRCL_IM cx, 1
41    rep     %1b
[46]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:
[592]52;       CF:     Cleared
[46]53;       SI, DI: Updated by number of bytes copied
[41]54;   Corrupts registers:
[46]55;       Nothing
[41]56;--------------------------------------------------------------------
[592]57%ifndef EXCLUDE_FROM_XUB
[41]58ALIGN JUMP_ALIGN
[46]59Memory_CopyCXbytesFromDSSItoESDI:
[592]60    push    cx
61    OPTIMIZE_STRING_OPERATION movs
62    pop     cx
[46]63    ret
[131]64%endif
[41]65
[46]66
[41]67;--------------------------------------------------------------------
[46]68; Memory_ZeroSSBPwithSizeInCX
[41]69;   Parameters
[46]70;       CX:     Number of bytes to zero
[41]71;       SS:BP:  Ptr to buffer to zero
72;   Returns:
73;       Nothing
74;   Corrupts registers:
[592]75;       CX
[41]76;--------------------------------------------------------------------
[489]77%ifdef INCLUDE_MENU_LIBRARY
[41]78ALIGN JUMP_ALIGN
[46]79Memory_ZeroSSBPwithSizeInCX:
[50]80    push    es
81    push    di
[41]82    push    ax
[105]83    call    Registers_CopySSBPtoESDI
[46]84    call    Memory_ZeroESDIwithSizeInCX
[41]85    pop     ax
[50]86    pop     di
87    pop     es
[41]88    ret
[489]89%endif
[41]90
[526]91
[41]92;--------------------------------------------------------------------
[46]93; Memory_ZeroESDIwithSizeInCX
[41]94;   Parameters
[46]95;       CX:     Number of bytes to zero
96;       ES:DI:  Ptr to destination buffer
[41]97;   Returns:
[50]98;       DI:     Updated by number of BYTEs stored
[41]99;   Corrupts registers:
[592]100;       AX, CX
[41]101;--------------------------------------------------------------------
102ALIGN JUMP_ALIGN
[46]103Memory_ZeroESDIwithSizeInCX:
[41]104    xor     ax, ax
[46]105    ; Fall to Memory_StoreCXbytesFromAccumToESDI
[41]106
107;--------------------------------------------------------------------
[46]108; Memory_StoreCXbytesFromAccumToESDI
[41]109;   Parameters
110;       AX:     Word to use to fill buffer
[46]111;       CX:     Number of BYTEs to store
112;       ES:DI:  Ptr to destination buffer
[41]113;   Returns:
[50]114;       DI:     Updated by number of BYTEs stored
[41]115;   Corrupts registers:
[592]116;       CX
[41]117;--------------------------------------------------------------------
[46]118Memory_StoreCXbytesFromAccumToESDI:
[592]119    OPTIMIZE_STRING_OPERATION stos
[41]120    ret
121
122
123;--------------------------------------------------------------------
[602]124; Memory_ReserveCLbytesFromStackToDSSI
[41]125; Memory_ReserveCXbytesFromStackToDSSI
126;   Parameters
[602]127;       CL/CX:  Number of bytes to reserve
[41]128;   Returns:
129;       DS:SI:  Ptr to reserved buffer
130;   Corrupts registers:
131;       AX
132;--------------------------------------------------------------------
[592]133%ifndef EXCLUDE_FROM_XUB
[41]134ALIGN JUMP_ALIGN
[602]135Memory_ReserveCLbytesFromStackToDSSI:
136    xor     ch, ch
[41]137Memory_ReserveCXbytesFromStackToDSSI:
138    pop     ax
139    push    ss
140    pop     ds
141    sub     sp, cx
142    mov     si, sp
143    jmp     ax
[194]144%endif
[440]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
[445]154;       ZF:     Set if result is zero
155;               Cleared if result is non-zero
[440]156;   Corrupts registers:
157;       CX
158;--------------------------------------------------------------------
[580]159%ifndef EXCLUDE_FROM_XTIDECFG OR NO_ATAID_VALIDATION
[440]160ALIGN JUMP_ALIGN
161Memory_SumCXbytesFromESSItoAL:
[621]162    add     si, cx
[440]163    xor     al, al
164ALIGN JUMP_ALIGN
165.AddNextByteToAL:
[621]166    dec     si
[440]167    add     al, [es:si]
168    loop    .AddNextByteToAL
169    ret
[445]170%endif
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