source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH15h_HSize.asm@ 542

Last change on this file since 542 was 526, checked in by krille_n_@…, 11 years ago

Changes:

  • Update of the copyright notices to include the year 2013.
File size: 3.6 KB
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1; Project name : XTIDE Universal BIOS
2; Description : Int 13h function AH=15h, Read Disk Drive Size.
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; Int 13h function AH=15h, Read Disk Drive Size.
25;
26; AH15h_HandlerForReadDiskDriveSize
27; Parameters:
28; DL: Translated Drive number
29; DS:DI: Ptr to DPT (in RAMVARS segment)
30; SS:BP: Ptr to IDEPACK
31; Returns with INTPACK:
32; If successful:
33; AH: Hard Disk: 3 (Hard disk accessible)
34; Floppy: 1 (Floppy disk, without change detection)
35; CX:DX: Total number of sectors
36; CF: 0
37; If failed:
38; AH: 0 (Drive not present)
39; CX:DX: 0
40; CF: 1
41;--------------------------------------------------------------------
42AH15h_HandlerForReadDiskDriveSize:
43%ifdef MODULE_SERIAL_FLOPPY
44 mov cl, 1 ; 1 = floppy disk, no change detection
45
46 test dl,dl ; DO NOT store the sector count if this is a
47 jns .FloppyDrive ; floppy disk, some OS's depend on this not
48 ; happening for floppies in order to boot.
49%endif
50
51 call AH15h_GetSectorCountToBXDXAX
52 mov [bp+IDEPACK.intpack+INTPACK.cx], dx ; HIWORD to CX
53 xchg [bp+IDEPACK.intpack+INTPACK.dx], ax ; LOWORD to DX, AL gets drive number
54
55 xor ah, ah
56%ifdef MODULE_SERIAL_FLOPPY
57 mov cl, 3 ; 3 = Hard Disk Accessible
58.FloppyDrive:
59
60 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber ; Store success to BDA and CF
61 mov [bp+IDEPACK.intpack+INTPACK.ah], cl
62%else
63 call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH ; Store success to BDA and CF
64 mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], 3
65%endif
66
67 jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
68
69
70;--------------------------------------------------------------------
71; AH15h_GetSectorCountFromForeignDriveToDXAX:
72; AH15h_GetSectorCountToBXDXAX:
73; Parameters:
74; DL: Drive number (AH15h_GetSectorCountFromForeignDriveToDXAX only)
75; DS: RAMVARS segment
76; DS:DI: Ptr to DPT (AH15h_GetSectorCountToDXAX only)
77; Returns:
78; DX:AX: Total sector count
79; BX: Zero
80; Corrupts registers:
81; CX
82;--------------------------------------------------------------------
83%ifdef MODULE_BOOT_MENU
84AH15h_GetSectorCountFromForeignDriveToDXAX:
85 mov ah, GET_DRIVE_PARAMETERS
86 call Int13h_CallPreviousInt13hHandler
87 jmp SHORT ConvertAH08hReturnValuesToSectorCount
88%endif
89
90AH15h_GetSectorCountToBXDXAX:
91 call AH8h_GetDriveParameters
92 ; Fall to ConvertAH08hReturnValuesToSectorCount
93
94ConvertAH08hReturnValuesToSectorCount:
95 call Address_ExtractLCHSparametersFromOldInt13hAddress
96 mov al, bh ; AL = Max head number
97 inc cx ; Max cylinder number to cylinder count
98 inc ax ; Max head number to head count (AH=8h returns max 254 so no overflow to AH)
99 mul bl ; AX = Head count * Sectors per track
100 mul cx ; DX:AX = Total sector count for AH=0xh transfer functions
101 xor bx, bx
102 ret
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