source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH24h_HSetBlocks.asm@ 491

Last change on this file since 491 was 491, checked in by krille_n_@…, 12 years ago

Changes:

  • Added a new define (USE_UNDOC_INTEL) that enables optimizations possible by using undocumented instructions available on all Intel processors and truly compatible clones. AFAIK the only exceptions are the NEC V-series and the Sony CXQ70108 processors so this option should be safe for use on the AT builds.
  • Building BIOSDRVS or the BIOS without MODULE_STRINGS_COMPRESSED would fail due to the recent code exclusions so I changed them a bit. Also fixed the mistaken change to Main.asm
  • Changed the Tandy specific info in Configuration_FullMode.txt so it matches the info in the Wiki.
  • Optimizations and fixes in general.
File size: 2.8 KB
Line 
1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=24h, Set Multiple Blocks.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 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; Int 13h function AH=24h, Set Multiple Blocks.
25;
26; AH24h_HandlerForSetMultipleBlocks
27; Parameters:
28; AL: Same as in INTPACK
29; DL: Translated Drive number
30; DS:DI: Ptr to DPT (in RAMVARS segment)
31; SS:BP: Ptr to IDEPACK
32; Parameters on INTPACK:
33; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
34; Returns with INTPACK:
35; AH: Int 13h return status
36; CF: 0 if successful, 1 if error
37;--------------------------------------------------------------------
38AH24h_HandlerForSetMultipleBlocks:
39%ifndef USE_186
40 call AH24h_SetBlockSize
41 jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
42%else
43 push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
44 ; Fall to AH24h_SetBlockSize
45%endif
46
47
48;--------------------------------------------------------------------
49; AH24h_SetBlockSize
50; Parameters:
51; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128)
52; DS:DI: Ptr to DPT (in RAMVARS segment)
53; SS:BP: Ptr to IDEPACK
54; Returns:
55; AH: Int 13h return status
56; CF: 0 if successful, 1 if error
57; Corrupts registers:
58; AL, CX, DX
59;--------------------------------------------------------------------
60AH24h_SetBlockSize:
61%ifdef MODULE_8BIT_IDE
62 ; XT-CF does not support largest block size in DMA mode.
63 cmp al, XTCF_DMA_MODE_MAX_BLOCK_SIZE
64 jbe SHORT .NoNeedToLimitBlockSize
65 cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_XTCF_DMA
66 je SHORT AH1Eh_LoadInvalidCommandToAHandSetCF
67.NoNeedToLimitBlockSize:
68%endif ; MODULE_8BIT_IDE
69
70 push bx
71
72 push ax
73 xchg dx, ax ; DL = Block size (Sector Count Register)
74 mov al, COMMAND_SET_MULTIPLE_MODE
75 mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRDY, FLG_STATUS_DRDY)
76 call Idepack_StoreNonExtParametersAndIssueCommandFromAL
77 pop bx
78 jnc SHORT .StoreBlockSize
79 mov bl, 1 ; Block size 1 will always work
80.StoreBlockSize: ; Store new block size to DPT and return
81 mov [di+DPT_ATA.bBlockSize], bl
82
83 pop bx
84 ret
Note: See TracBrowser for help on using the repository browser.