source: xtideuniversalbios/trunk/Assembly_Library/Inc/CgaSnow.inc@ 594

Last change on this file since 594 was 589, checked in by Krister Nordvall, 8 years ago

Changes:

  • BIOS: Fixed a purely cosmetic bug from r542 where, in builds containing MODULE_EBIOS, the boot menu would display an incorrect drive size (0.4 kB with MODULE_STRINGS_COMPRESSED or 0.5 kB without) for old drives with no support for LBA.
  • Fixed a bug from r392 where Vision_DetectAndReturnIDinAXandPortInDXifControllerPresent would return the ID in AL instead of AH (if DANGEROUS_DETECTION had been defined).
  • Fixed a bug from r587 in AdvAtaInit.asm that would prevent detection of QDI Vision controllers.
  • Also changed how the QDI Vision IDs are defined (removed the need for shifting) to avoid confusion. This fixed a potential bug from r587 in AdvAtaInit.asm where some IDs were not being shifted.
  • Fixed a bug in PDC20x30.asm from r587 where GetPdcIDtoAX would not return with the IDE base port in DX so DisablePdcProgrammingMode would fail.
  • Made some changes to ModuleDependency.inc and other files so that MODULE_ADVANCED_ATA now requires USE_386. Consequently it is no longer included in the regular AT-builds, only in the 386_8k-build.
  • Moved the UNROLL_SECTORS_IN_CX_TO_xWORDS macros from IDE_8bit.inc to IdeIO.inc which means it's now possible to build a BIOS without MODULE_8BIT_IDE.
  • XTIDECFG: Added a minimum DOS version check (since it needs DOS version 2+) to allow the program to quit gracefully in the unlikely scenario where someone tries to run it under DOS version 1.
  • Made some changes to Drive.asm to improve drive enumeration. The old method using GET_DOS_DRIVE_PARAMETER_BLOCK_FOR_SPECIFIC_DRIVE worked well in Windows XP but not in Windows 98 SE (in Windows or in DOS mode). The two problems were; 1) The function call would access the drives which on single floppy drive systems would cause Windows to swap between A: and B: (throwing a blue screen asking the user to insert a disk etc). 2) Only floppy drives and FAT16 drives would be available in the list of drives, no FAT32/optical/network drives.
  • Improved code in IdeControllerMenu.asm so that the default port addresses for all IDE interfaces are now restored when (re-)selecting the (same) type of IDE device.
  • Also made it impossible to select a device type unless the required module is included in the loaded BIOS.
  • The version check done when loading a BIOS now uses the FLASH_SIGNATURE definition from Version.inc. Any changes affecting RomVars now only requires updating that definition. This means that changes to RomVars must be implemented in both the BIOS and XTIDECFG before being committed to the repository.
  • Added a compatibility fix for 3Com 3C503 cards to the ROM checksumming code in Buffers.asm (Buffers_GenerateChecksum).
  • SerDrive: Made some minor changes to file names and paths to improve compatibility with case sensitive environments.
  • BIOSDRVS: Made a minor size optimization which as a side effect also makes it compatible with all DOS versions including DOS version 1.
  • Library: Renamed the WAIT_RETRACE_IF_NECESSARY_THEN macro to CALL_WAIT_FOR_RETRACE_IF_NECESSARY_THEN and made a tail-call-optimized version of it (JMP_WAIT_FOR_RETRACE_IF_NECESSARY_THEN).
  • A speed optimization to the eRCL_IM macro for 386 and higher. This change breaks emulation in the sense that the macro will fail when given a memory operand as the first parameter.
  • Other minor optimizations and fixes.
File size: 2.3 KB
RevLine 
[589]1; Project name : Assembly Library
[48]2; Description : Macros for preventing CGA snow.
3%ifndef CGASNOW_INC
4%define CGASNOW_INC
5
6;--------------------------------------------------------------------
[589]7; CALL_WAIT_FOR_RETRACE_IF_NECESSARY_THEN
8; JMP_WAIT_FOR_RETRACE_IF_NECESSARY_THEN
[48]9; Parameters:
10; %1: Instruction that accessed CGA memory
11; AL: Character to output
12; AH: Attribute to output (stosw only)
13; DS: BDA segment (zero)
14; ES:SI: Ptr to video memory where to read from (if %1 reads)
15; ES:DI: Ptr to video memory where to output (if %1 writes)
16; Returns:
17; SI, DI: Updated according to instruction
18; Corrupts registers:
19; AX, DX
20;--------------------------------------------------------------------
[589]21%macro CALL_WAIT_FOR_RETRACE_IF_NECESSARY_THEN 1
[48]22%ifdef ELIMINATE_CGA_SNOW
23 %ifidn %1, stosb
[49]24 call CgaSnow_Stosb
[48]25 %elifidn %1, stosw
[49]26 call CgaSnow_Stosw
[48]27 %elifidn %1, rep movsb
[49]28 call CgaSnow_RepMovsb
[48]29 %else
[589]30 %error "Invalid instruction passed to CALL_WAIT_FOR_RETRACE_IF_NECESSARY_THEN"
[48]31 %endif
32%else ; No CGA snow prevention
33 %ifidn %1, rep movsb
34 eSEG_STR rep, es, movsb
35 %else
36 %1 ; Single instruction
37 %endif
38%endif
39%endmacro
40
[589]41%macro JMP_WAIT_FOR_RETRACE_IF_NECESSARY_THEN 1
42%ifdef ELIMINATE_CGA_SNOW
43 %ifidn %1, stosb
44 jmp CgaSnow_Stosb
45 %elifidn %1, stosw
46 jmp CgaSnow_Stosw
47 %elifidn %1, rep movsb
48 jmp CgaSnow_RepMovsb
49 %else
50 %error "Invalid instruction passed to JMP_WAIT_FOR_RETRACE_IF_NECESSARY_THEN"
51 %endif
52%else ; No CGA snow prevention
53 %ifidn %1, rep movsb
54 eSEG_STR rep, es, movsb
55 ret
56 %else
57 %1 ; Single instruction
58 ret
59 %endif
60%endif
61%endmacro
[48]62
[589]63
[48]64;--------------------------------------------------------------------
65; WAIT_UNTIL_SAFE_CGA_WRITE
66; Parameters:
67; DX: CGA Status Register Address (3DAh)
68; Returns:
69; Nothing
70; Corrupts registers:
71; AL
72;--------------------------------------------------------------------
73%macro WAIT_UNTIL_SAFE_CGA_WRITE 0
74%%WaitUntilNotInRetrace:
75 in al, dx
76 shr al, 1 ; 1 = Bit 0: A 1 indicates that regen-buffer memory access can be
77 ; made without interfering with the display. (H or V retrace)
78 jc SHORT %%WaitUntilNotInRetrace
79%%WaitUntilNextRetraceStarts:
80 in al, dx
81 shr al, 1
82 jnc SHORT %%WaitUntilNextRetraceStarts
83%endmacro
84
85
86%endif ; CGASNOW_INC
Note: See TracBrowser for help on using the repository browser.