Last change
on this file since 117 was
117,
checked in by krille_n_@…, 13 years ago
|
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
|
File size:
1.0 KB
|
Rev | Line | |
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[117] | 1 | ; Project name : XTIDE Universal BIOS |
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[3] | 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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[117] | 34 | call HCapacity_GetSectorCountFromOurAH08h; Sector count to DX:AX (clears CF) |
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[3] | 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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[35] | 41 | jmp Int13h_ReturnWithValueInDL |
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