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Last change
on this file since 462 was 35, checked in by Tomi Tilli, 14 years ago |
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Cleaned recent changes a bit to save few bytes.
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File size:
1.1 KB
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| 1 | ; File name : AH15h_HSize.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 28.9.2007
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| 4 | ; Last update : 24.8.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Int 13h function AH=15h, Read Disk Drive Size.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Int 13h function AH=15h, Read Disk Drive Size.
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| 13 | ;
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| 14 | ; AH15h_HandlerForReadDiskDriveSize
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| 15 | ; Parameters:
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| 16 | ; AH: Bios function 15h
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| 17 | ; DL: Drive number
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| 18 | ; Parameters loaded by Int13h_Jump:
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| 19 | ; DS: RAMVARS segment
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| 20 | ; Returns:
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| 21 | ; If succesfull:
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| 22 | ; AH: 3 (Hard disk accessible)
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| 23 | ; CX:DX: Total number of sectors
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| 24 | ; CF: 0
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| 25 | ; If failed:
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| 26 | ; AH: 0 (Drive not present)
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| 27 | ; CX:DX: 0
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| 28 | ; CF: 1
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| 29 | ; IF: 1
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| 30 | ; Corrupts registers:
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| 31 | ; Flags
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| 32 | ;--------------------------------------------------------------------
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| 33 | ALIGN JUMP_ALIGN
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| 34 | AH15h_HandlerForReadDiskDriveSize:
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| 35 | push bx
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| 36 | push ax
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| 37 |
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| 38 | call HCapacity_GetSectorCountFromOurAH08h; Sector count to DX:AX
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| 39 | mov cx, dx ; HIWORD to CX
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| 40 | xchg dx, ax ; LOWORD to DX
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| 41 |
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| 42 | pop ax
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| 43 | pop bx
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| 44 | mov ah, 3 ; Type code = Hard disk
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| 45 | clc
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| 46 | jmp Int13h_ReturnWithValueInDL
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