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Last change
on this file since 147 was 117, checked in by krille_n_@…, 13 years ago |
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Changes to the XTIDE Universal BIOS:
- Bugfix: The stack swapping in BootVars_SwitchBackToPostStack wasn't really an atomic operation anymore (on 186 and 286 CPUs) so I reverted the change I did in the previous revision.
- A very small size optimization in AH15h_HSize.asm
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File size:
1.0 KB
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| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=15h, Read Disk Drive Size.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Int 13h function AH=15h, Read Disk Drive Size.
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| 9 | ;
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| 10 | ; AH15h_HandlerForReadDiskDriveSize
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| 11 | ; Parameters:
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| 12 | ; AH: Bios function 15h
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| 13 | ; DL: Drive number
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| 14 | ; Parameters loaded by Int13h_Jump:
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| 15 | ; DS: RAMVARS segment
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| 16 | ; Returns:
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| 17 | ; If succesfull:
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| 18 | ; AH: 3 (Hard disk accessible)
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| 19 | ; CX:DX: Total number of sectors
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| 20 | ; CF: 0
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| 21 | ; If failed:
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| 22 | ; AH: 0 (Drive not present)
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| 23 | ; CX:DX: 0
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| 24 | ; CF: 1
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| 25 | ; IF: 1
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| 26 | ; Corrupts registers:
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| 27 | ; Flags
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| 28 | ;--------------------------------------------------------------------
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| 29 | ALIGN JUMP_ALIGN
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| 30 | AH15h_HandlerForReadDiskDriveSize:
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| 31 | push bx
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| 32 | push ax
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| 33 |
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| 34 | call HCapacity_GetSectorCountFromOurAH08h; Sector count to DX:AX (clears CF)
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| 35 | mov cx, dx ; HIWORD to CX
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| 36 | xchg dx, ax ; LOWORD to DX
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| 37 |
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| 38 | pop ax
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| 39 | pop bx
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| 40 | mov ah, 3 ; Type code = Hard disk
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| 41 | jmp Int13h_ReturnWithValueInDL
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