1 | ; File name : AH3h_HWrite.asm |
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2 | ; Project name : IDE BIOS |
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3 | ; Created date : 13.10.2007 |
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4 | ; Last update : 12.4.2010 |
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5 | ; Author : Tomi Tilli |
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6 | ; Description : Int 13h function AH=3h, Write Disk Sectors. |
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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=3h, Write Disk Sectors. |
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13 | ; |
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14 | ; AH3h_HandlerForWriteDiskSectors |
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15 | ; Parameters: |
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16 | ; AH: Bios function 3h |
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17 | ; AL: Number of sectors to write |
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18 | ; CH: Cylinder number, bits 7...0 |
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19 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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20 | ; Bits 5...0: Starting sector number (1...63) |
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21 | ; DH: Starting head number (0...255) |
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22 | ; DL: Drive number (8xh) |
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23 | ; ES:BX: Pointer to source data |
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24 | ; Parameters loaded by Int13h_Jump: |
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25 | ; DS: RAMVARS segment |
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26 | ; Returns: |
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27 | ; AH: Int 13h/40h floppy return status |
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28 | ; CF: 0 if successfull, 1 if error |
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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 | AH3h_HandlerForWriteDiskSectors: |
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35 | test al, al ; Invalid sector count? |
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36 | jz SHORT AH2h_ZeroCntErr ; If so, return with error |
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37 | |
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38 | ; Save registers |
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39 | push dx |
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40 | push cx |
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41 | push bx |
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42 | push ax |
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43 | |
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44 | ; Select sector or block mode command |
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45 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT |
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46 | mov ah, HCMD_WRITE_SECT ; Load sector mode command |
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47 | cmp BYTE [di+DPT.bSetBlock], 1 ; Block mode enabled? |
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48 | jbe SHORT .XferData ; If not, jump to transfer |
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49 | mov ah, HCMD_WRITE_MUL ; Load block mode command |
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50 | |
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51 | ; Transfer data |
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52 | ALIGN JUMP_ALIGN |
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53 | .XferData: |
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54 | call HCommand_OutputCountAndLCHSandCommand |
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55 | jc SHORT .Return ; Return if error |
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56 | call HPIO_WriteBlock ; Write data to IDE-controller |
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57 | .Return: |
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58 | jmp Int13h_PopXRegsAndReturn |
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