1 | ; File name : AH24h_HSetBlocks.asm |
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2 | ; Project name : IDE BIOS |
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3 | ; Created date : 28.12.2009 |
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4 | ; Last update : 14.1.2011 |
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5 | ; Author : Tomi Tilli, |
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6 | ; : Krister Nordvall (optimizations) |
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7 | ; Description : Int 13h function AH=24h, Set Multiple Blocks. |
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8 | |
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9 | ; Section containing code |
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10 | SECTION .text |
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11 | |
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12 | ;-------------------------------------------------------------------- |
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13 | ; Int 13h function AH=24h, Set Multiple Blocks. |
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14 | ; |
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15 | ; AH24h_HandlerForSetMultipleBlocks |
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16 | ; Parameters: |
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17 | ; AH: Bios function 24h |
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18 | ; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128) |
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19 | ; DL: Drive number |
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20 | ; Parameters loaded by Int13h_Jump: |
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21 | ; DS: RAMVARS segment |
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22 | ; Returns: |
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23 | ; AH: Int 13h return status |
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24 | ; CF: 0 if succesfull, 1 if error |
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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 | AH24h_HandlerForSetMultipleBlocks: |
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31 | push dx |
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32 | push cx |
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33 | push bx |
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34 | push ax |
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35 | %ifndef USE_186 |
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36 | call AH24h_SetBlockSize |
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37 | jmp Int13h_PopXRegsAndReturn |
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38 | %else |
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39 | push Int13h_PopXRegsAndReturn |
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40 | ; Fall through to AH24h_SetBlockSize |
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41 | %endif |
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42 | |
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43 | |
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44 | ;-------------------------------------------------------------------- |
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45 | ; Sets block size for block mode transfers. |
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46 | ; |
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47 | ; AH24h_SetBlockSize |
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48 | ; Parameters: |
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49 | ; AL: Number of Sectors per Block (1, 2, 4, 8, 16, 32, 64 or 128) |
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50 | ; DL: Drive number |
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51 | ; DS: RAMVARS segment |
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52 | ; Returns: |
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53 | ; DS:DI: Ptr to DPT |
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54 | ; AH: Int 13h return status |
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55 | ; CF: 0 if succesfull, 1 if error |
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56 | ; Corrupts registers: |
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57 | ; AL, BX, CX, DX, DI |
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58 | ;-------------------------------------------------------------------- |
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59 | ALIGN JUMP_ALIGN |
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60 | AH24h_SetBlockSize: |
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61 | ; Select Master or Slave and wait until ready |
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62 | mov bl, al ; Backup block size |
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63 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT |
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64 | call HDrvSel_SelectDriveAndDisableIRQ ; Select drive and wait until ready |
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65 | jc SHORT .Return ; Return if error |
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66 | |
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67 | ; Output block size and command |
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68 | mov al, bl ; Restore block size to AL |
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69 | mov ah, HCMD_SET_MUL ; Load command to AH |
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70 | mov dx, [RAMVARS.wIdeBase] ; Load base port address |
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71 | add dx, BYTE REG_IDE_CNT |
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72 | call HCommand_OutputSectorCountAndCommand |
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73 | call HStatus_WaitBsyDefTime ; Wait until drive not busy |
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74 | jc SHORT .DisableBlockMode |
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75 | |
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76 | ; Store new block size to DPT and return |
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77 | mov [di+DPT.bSetBlock], bl ; Store new block size |
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78 | xor ah, ah ; Zero AH and CF since success |
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79 | ret |
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80 | .DisableBlockMode: |
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81 | mov BYTE [di+DPT.bSetBlock], 1 ; Disable block mode |
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82 | .Return: |
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83 | ret |
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